Autor: Kowalski, M - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Noise emission level versus the structure of the aircraft turbine engine
Autorzy:: Kowalski, M.
Powiązania:: https://bibliotekanauki.pl/articles/241859.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: noise of aircraft engines
environmental impact of a jet engine turbine
Opis:: This article presents the problem of noise generated by turbine jet engines. It points out possible directions of noise decrease with particular emphasis upon structural changes within the engines, the task of which is to reduce the noise mission. The example of the modernization is based upon the "bypass" type of one-flow turbine jet engine. The essay contains theoretical basis of calculation of the noise emission level and the results, which graphically indicate a relative level of noise of this type of engine depending upon the amount of discharged air and the diameter of the discharge nozzle and the radius, upon the basis of which the noise level is determined. This work also includes a comparison of the relative noise level of this type of engine with regard to one-flow turbine engine equipped with the function of air discharge to the environment and with regard to two-flow turbine jet engine equipped with air stream flow mixing device. The essay ends with short conclusions. In order to struggle with the air noise special "Environmental Protection Programmes" are prepared. Civil airports and military airports prepare new procedures for taking off and approaching planes as well as optimize the approach and take off airport flight zone corridors. Unfortunately, in the case of so big surfaces, acoustic screens would not bring desired effects, also due to costs.
Źródło:: Journal of KONES; 2012, 19, 4; 325-332
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Analysis of an aircraft engine start-up process on the example of the PZL-130 TC-II „Orlik” training aircraft
Autorzy:: Kowalski, M.
Powiązania:: https://bibliotekanauki.pl/articles/244355.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: diagnostics of aircraft engines
qualification tests of aircraft driving units
Opis:: The paper discloses the analysis of processes that take place during the start-up operation of the driving unit for the training aircraft of the TZL-130 TC-II Turbo-Orlik type. The aircraft is designed for selective and initial trainings at the Air Force School of “Little Eagles” in Dęblin. The driving unit comprises the PT6A-25C turbo-propeller engine from Pratt & Whitney combined with the four-bladed airscrew from Hatzell. It is specifically mentioned that data for the analysis were sourced from the S2-3a on-board recorder of flight parameters manufactured by the Air Force Institute of Technology (AFIT). The analysis was carried out both during ground and flight tests. The paper briefly outlines general structures and operation principles of typical start-up systems with the focus to their key components. Attention is paid to how important it is to select an appropriate start-up system to match the specific aircraft type and the guideline parameters for selection that should be adhered to are specified. Also there are disclosed the key mathematical relationships that are indispensable to design start-up systems and to find out their basic characteristics. It is emphasized that the start-up operation must be considered as a non-stationary process that lasts from the standstill state of the engine until the moment when the minimum required rpm is reached, sufficient to generate necessary power of the engine. In addition, the attention is paid to the fact that the value of the engine acceleration is crucial to the achievable start-up time that is deemed as one of key parameters for all start-up systems. It is demonstrated that to achieve the required level of acceleration, it is necessary to secure the so called overhead of the engine power which needs constant flow offuel and air into the combustion chamber of the engine. The last part of the paper comprises selected characteristic curves that were obtained from the analysis of the engine start-up processes both on ground and in flight. The final conclusions emphasize that the start-up system for the presented driving unit is really efficient and guarantees correct operation of the engine under any conditions.
Źródło:: Journal of KONES; 2014, 21, 3; 177-189
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Environmental protection and technical tests of military off-road trucks
Autorzy:: Kowalski, M.
Powiązania:: https://bibliotekanauki.pl/articles/949508.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: diagnostics
military vehicles
systems responsible
polluting the environment
Opis:: This paper presents the most vital parts of technical tests of military vehicles in relation to environmental protection. The presented method is based on the most popular military off-road truck of the Star 1466 type. It includes a diagram showing the parts of the test of this vehicle from the perspective of environmental protection whose sequence is not imposed. What is solely required is that all these parts are executed - in accordance with the applicable provisions. For this purpose, the paper presents the methodology (whose major parts are described) of testing the vehicle complying with the requirements of environmental protection. Furthermore, it outlines the process of checking leakages of exploitation fluids, smoke opacity, measurement of external noise of this vehicle and the measurement of the level of an acoustic signal. The description of particular checks is based on the applicable provisions and regulations, as well as on typical and commonly available measuring instruments. It is stressed how important it is to maintain and follow the technical parameters - concerning the systems (units) responsible for polluting the environment - which are required by particular provisions and regulations. In the conclusions, the most crucial documents governing the organization of stations used for testing military vehicles, as well as methods and necessary equipment, have been presented.
Źródło:: Journal of KONES; 2014, 21, 4; 263-272
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Safe speed of a passenger car in circular motion
Autorzy:: Kowalski, M.
Powiązania:: https://bibliotekanauki.pl/articles/949510.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: driving safety
vehicle motion
curvilinear track
Opis:: In this paper, selected elements of the theory of the car's motion were presented. It was emphasised that it is extremely important to know the rules of behaviour of a car in curvilinear motion, an example of which is a curve, especially when driving in adverse weather conditions resulting in the significant reduction of the car's traction to the surface. The active electronic stability programme (ESP) of the car's trajectory, its principle of operation and benefits of use were briefly discussed. The next part was to present the basics of the mechanics of a vehicle's motion, especially the forces acting on a car during its stop phase, the forces acting on the curve of the road. On this basis, the basic equilibrium equations were presented, which in turn led to defining the correlation for determining the so-called safe speed of driving in circular motion, which also guarantees the impossibility of the cars skidding. In the further part, the calculations, in accordance with the BMW 320d car's data were made. Hypothetically, it was assumed that this car might have only a front-wheel drive, only a rear-wheel drive or a four-wheel drive. The idea was to check to what extent the type of drive has an impact on the achieved value of the safe speed of driving in the circular motion with a minimum turning radius for this vehicle. The article was completed with short conclusions, in which the importance of the electronic stability programme (ESP) of the car's trajectory was emphasised.
Źródło:: Journal of KONES; 2014, 21, 4; 273-280
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Adaptive jet engines, advantages and application opportunities
Autorzy:: Kowalski, M.
Powiązania:: https://bibliotekanauki.pl/articles/245535.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
combustion engine
adaptation engine
parameters of the engine air
Opis:: The paper has been intended to shortly describe the design of an adaptive jet engine, commonly termed 'the bypass engine'. Examples have been presented of how the bleeding of air affects the most essential engine performance characteristics, i.e. thrust, specific fuel consumption, and efficiency. Pointed out are economic advantages (only slight) of the application of this design as compared to the one-pass turbojet engine with no bleed. Furthermore, considered are capabilities to adapt an engine design of the bypass type for a one-pass turbojet engine K-15 as one of several upgrade opportunities. Simulation-based computations have proved, however, that there are some limitations on the bleed air amount and initial engine operational range for the accomplishment of the idea from the standpoint of capabilities to maintain conditions for the compressor-turbine matching. Also, the effect of this type of air bleeding upon the engine running-up process and the change in the running-up time for this type of the upgraded engine has been shown. In the Recapitulation and Conclusions section a mention has been made on the amount of bleed air to be passed through external channels from behind the compressor to behind the turbine: the bleed air amount increases as the total rate of the air flow along the engine flow path increases. It means that better effects of applying this type of air bleeding processes are gained in large engines. Presented are also capabilities of further developments and applications.
Źródło:: Journal of KONES; 2011, 18, 3; 161-168
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Analysis of vibroacoustic properties of the 250-C20R/2 RRC (Allison) engine in the support surface of the compressor
Autorzy:: Kowalski, M.
Powiązania:: https://bibliotekanauki.pl/articles/247973.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: vibroacoustic properties
engine vibration analysis
Opis:: The paper presents an analysis of the levels of vibration on the compressor in the support surface of the American RRC Allison 250-C20R engine built into the SW-4 Puszczyk helicopter. Then, it presents the association of occurring vibrations with their source of origin, and also the comparison of their values with the limit values specified in the operating manual of the helicopter. The methodology of the conducted research and analyses are explained. The essential elements preceding the research, such as determining time courses, on the basis of which the most important parts to conduct the detailed analyses of changes of the basic parameters and compliance with technical conditions, are defined. Moreover, the theoretical issues in terms of determination and description of the characteristic parameters of mechanical vibrations are briefly presented. The typical terms used in the procedures of vibration, description and measurements are explained. The importance of the interpretation of measurements is quite significantly emphasised and the components of the main engine, which were subject to measurement, are indicated. The difficulties in the identification of the vibration due to the high probability of overlapping of vibrations coming from several elements are emphasised. Next, the methodology of measurement is described, in which, among others, mounting points of vibration sensors are presented. The final part of the paper is mainly a graphical presentation of the results, on the basis of which the conclusions are developed. The conclusions show a lack of decisive symptoms indicating the danger at the level of vibrations, and present the future directions of work, which will allow for a more detailed analysis.
Źródło:: Journal of KONES; 2014, 21, 4; 281-288
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Adaptive jet engines work analysis and control
Autorzy:: Kowalski, M.
Powiązania:: https://bibliotekanauki.pl/articles/242121.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: adaptation engine
parameters of the engine air
sensitivity of work cycle
Opis:: The paper describes major designs of adaptive jet engines as well as their structural and operational advantages. Attention is paid to actual thermodynamic cycles of such engines and energy balance of flows. Particular attention paid to a double-rotor engine designed by Pratt & Whitney, where a portion of air is bled from downstream of the compressor and then supplied to the area downstream the turbine when the engine is operated at its maximum performance (turbine bypass engine). Then attention is paid to actual thermodynamic cycles of such engines and energy balance of flows. It was shown that real working cycles of these engines represent figures with variable surface areas, which is the reason for the second name of these units - engines with variable thermodynamic cycle. It is explained how basic parameters of such engines affect sensitiveness of operating cycles and controllability. The analysis has been conducted separately for internal and external channel. The sensitivity analysis for the working cycle makes it possible to select parameters that are potentially controllable and adjustable. To sum up the foregoing deliberations one has to state that operation of turbojet adaptive engines is the topic that needs much more investigation. Even the design solution of the engine itself, although being really exciting and promising, is troublesome in the aspects of the design and process engineering, and will lead to a series of operation and maintenance problems.
Źródło:: Journal of KONES; 2011, 18, 2; 225-234
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Use of data from on-board data recorders for acceptance tests of avionic driving units
Autorzy:: Kowalski, M.
Powiązania:: https://bibliotekanauki.pl/articles/243070.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: diagnostics of aircraft engines
qualification tests for avionic driving units
Opis:: The paper explains how information stored in on-board recorders of flight parameters can be used for acceptance tests, also referred to as qualification tests. The disclosed example refers to the An-28 ‘Bryza’ aircraft where an old airscrew was substituted with the new generation Hartzell airscrew of the HC-B5 MP-3D type. The airscrew is an integral part of the driving system for the airscrew propelled aircraft that is provided with the TWD-10B engine. After revamping of the airscrew, the aircraft was named as TWD-10B/PZL-10S. The follow-up investigations were carried out with the aim to find out how much the airscrew substitution affected the alteration of key performance characteristics achieved by the driving unit of the aircraft. The investigations comprised both ground and in-flight tests and have led to determination of the essential characteristics for the engine operation as well as variations of the operational parameters in time. In some cases also so called phase portraits were found out for parameters of the engine operation so that to reflect dynamic properties of the engines. Such investigations are indispensable since the aircrafts are subject to operational limitations and technical conditions that must be mandatory fulfilled due to requirements of flight safety. The paper demonstrates that the data stored in on-board recorders of flight parameters can be really useful for execution of such acceptance (qualification) tests.
Źródło:: Journal of KONES; 2013, 20, 2; 201-206
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Application of the phase reproduction method to the analysis of an avionic event on board of the W-3 "Sokół" helicopter
Autorzy:: Kowalski, M.
Powiązania:: https://bibliotekanauki.pl/articles/244580.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: aircraft engine diagnostics
phase mapping of engine parameters
Opis:: This paper presents a new approach to the study of events/cases of the use of so-called air mapping phase. The examinations were carried out by means of the selective method on the basis of data for basic operational parameters acquired from the both driving units of the W-3 "Sokół" helicopter. The analysis covered quality of information received from the S2-3a on-board recorder of flight parameters, in particular its resolution and recording frequency. Then it was possible to plot waveforms for variation of the recorded parameters associated with operation of the helicopter engines and its rotor. The waveforms were used to determine the most important fragments suitable for detailed analysis of variations exercised by basic parameters and to check them against the Operation Manual for flights of the W-3 helicopter. The selected operation parameters were used for phase imaging (development of phase portraits), which served as the basis to assess dynamic properties of the parameters variations. The final component of the study consisted in discussion of the obtained results with presentation of conclusions. It is infeasible to monitor technical condition of the package joint between the transmission shaft and the PZL-10W aircraft. It is necessary to install additional sensors and gauges intended to improve accuracy and frequency of parameter readouts. Only sufficient amount of information shall enable application of the phase imaging method to efficient monitoring of technical and emergency operating conditions of aircraft engines.
Źródło:: Journal of KONES; 2011, 18, 1; 301-310
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: The effect of automotive vehicle braking system failure on driving safety
Autorzy:: Kowalski, M.
Powiązania:: https://bibliotekanauki.pl/articles/244871.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: car diagnostics
braking system
driving safety
Opis:: The paper describes systems responsible for driving safety of vehicles weighing up to 3.5 t. It is focused on selected failures (fouling) of braking systems that are typical during motor cars operation. Simulation testing regarding effect of selected failures (fouling) of braking system elements on braking force and braking efficiency were performed. In order to perform such testing, author of the paper worked out the methodology of testing which is also described here. The test results (partial) are displayed as tables and charts. The negative effect of selected failures on braking force and braking efficiency index is influencing directly on motor cars driving safety. It is also emphasized that it is important to maintain and observe automotive manufacturers’ technical requirements regarding braking system elements such as tyre pressure, tyre tread condition, brake shoes wear, etc. Basing on the test results it is found that excessive wear of tyres and brake shoes wear could be the reason of significant WSH index decrease resulting in faulty car. This can be visible through lower than allowable level of braking efficiency index WSH, which is the basic legal diagnostic parameter of break system condition assessment. Replacing such elements significantly improves braking efficiency index WSH.
Źródło:: Journal of KONES; 2013, 20, 1; 147-153
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Complex management system of the aviation training process
Autorzy:: Jemielniak, M.
Kowalski, M.
Powiązania:: https://bibliotekanauki.pl/articles/245390.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: aviation training system
pilot training
pilot education system
Opis:: This paper concerns the issue of management and assessment of the aviation training process, which takes into account the elements changing over time: the state of training, its level, quality and mechanisms rationalising the organisational activities and costs. The elements of the complex management system of the aviation training process, which includes probabilistic models for projecting the reliable, safe and effective aviation training, taking into account the requirements imposed by rules, standards and regulations of civil and military aviation, were discussed. In general, its structure, internal modules and exemplary tables of the analysis and assessment of the aviation personnel updates and the validity of permissible breaks during flight by aviation personnel. A schematic diagram of introducing the input data, main parameters, statistical data and expected results in the form of the training schedule, the schedule of the aircraft necessary moving, indicators of the training analysis and assessment, safety and reliability, were mentioned. The mathematical notations of input data and examples of the offered training indicator of aviation personnel were presented. The criterion global function, which exposes the maximisation of the aviation personnel training, as well as the maximisation of the performed flying time of a given type of aircraft, and the minimisation of operating costs of the specific aviation training, was determined. The paper was completed with a conclusion that shows the advantages of the proposed complex management system of the aviation training process.
Źródło:: Journal of KONES; 2016, 23, 3; 233-240
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Numerical modelling of combustion process with the use of ANSYS FLUENT code
Autorzy:: Kowalski, M.
Jankowski, M.
Powiązania:: https://bibliotekanauki.pl/articles/245622.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: liquid fuels
combustion processes
turbulent flow
combustion process model
ANSYS FLUENT
Opis:: The article presents the modelling of the combustion process of liquid fuels using professional ANSYS FLUENT software. This program allows modelling the dynamics of compressible and incompressible, laminar and turbulent flows as well as heat exchange phenomena with occurrence and without chemical reactions. The model presented in the article takes into account the influence of the gas phase on the liquid phase during the fuel combustion process. The influence of velocity and pressure of the flowing gas and the type of flow has a significant impact on the combustion of liquid fuels. The developed model is fully reliable and the presented results are consistent with experimental research. The occurrence of a laminar sublayer in a turbulent flow was confirmed, and the thickness of this layer and the turbulent layer significantly influences the course of the combustion process. The use of the flat flow model reflects the basic phenomena occurring during the combustion of liquid fuels under turbulent conditions. The use of the program for flows with different flow velocity profiles is justified. It gives important information about the processes taking place during the combustion of liquid fuels. The results of numerical tests are presented graphically. The article presents graphs of velocity field, absolute pressure, power lines, temperature and density.
Źródło:: Journal of KONES; 2018, 25, 4; 175-186
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Investigation of avionic events with use of information from on-board recorders of flight parameters
Autorzy:: Jemielniak, M.
Kowalski, M.
Powiązania:: https://bibliotekanauki.pl/articles/247002.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: investigation of avionic events
diagnostics of avionic driving systems
Opis:: The paper discloses opportunities of how information recorded by on-board recorders of flight parameters can be used for investigation of avionic events. An example of the methodical approach is presented of how to verify data acquired from flight recorders, which unambiguously indicates the feasibility of further investigation and analyses of avionic events that may happen to aircrafts. Subsequently the effect of the engine stall is outlined, which enables analysis of those avionic events when the effect of engine(s) stall took place. The paper discloses two cases of avionic events when engine stall was the underlying reason of problems, i.e. when a helicopter entered a stream of exhaust gases produced by a missile launched by that helicopter and when icing of the intake channel occurred in a turbojet engine installed on a helicopter. Investigations of that type are indispensable due to operation constraints and technical conditions of aircrafts operations, where meeting these conditions is the principal requirements in terms of flight safety. This study confirms that opportunities to use data from on-board recorders of flight parameters to find out what was going on with the aircrafts during avionic events are considerable.
Źródło:: Journal of KONES; 2014, 21, 1; 107-118
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: The study of the technical service impact on the aircraft technical readiness
Autorzy:: Uchman, Z.
Kowalski, M.
Powiązania:: https://bibliotekanauki.pl/articles/245912.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: exploitation system efficiency
aircraft technical readiness
technical services
Opis:: The efficiency of the aircraft exploitation process is a problem, to which more and more attention is paid not only in the commercial aviation, but also in the military one. One of the factors, which have a direct impact on its level, is the operated aircraft or helicopter technical readiness that is the ability of airworthiness when there is a need to use them in order to perform specific aviation tasks. In turn, the aircraft technical readiness level is affected by a number of factors, the most important of which include its characteristics, technical service system and logistical security system. This paper is devoted to the issue connected with the aircraft technical readiness assessment as well as identification of factors, which have an impact on its level, and also their impact level analysis. Furthermore, the particular attention was paid to technical services. The research results of a few types of aircraft in terms of the technical service malfunction and damage impact on their technical readiness level were also presented. At the end, the importance of such an approach and the possible use in practice were emphasised.
Źródło:: Journal of KONES; 2016, 23, 2; 397-406
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Environmental pollution caused by a direct injection engine
Autorzy:: Jankowski, A.
Kowalski, M.
Powiązania:: https://bibliotekanauki.pl/articles/243382.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engines
air pollution
environmental protection
Opis:: In the paper, the authors made an analysis of mechanisms of the toxic components formation of exhaust gases in the direct injection engines. The genesis as well as the typical engine construction solution with the use of direct injection in diesel engines and these with positive ignition was developed. The typical construction solution of the Common Rail (CR) system, which is one of many elements increasing the purity of exhaust gases, was also presented. The basic advantages of direct injection, especially in case of the positive ignition engine, were also briefly described. Then, the mechanism for the formation of toxic components of exhaust gases in the direct injection diesel engines was presented. Moreover, the definition and dependency on the indicated mean effective pressure were shown, and the closed indicator graph, which is indispensable to calculate values of this pressure, was also (graphically) presented. In this paper, the mechanisms and processes, with the use of which it is possible to reduce the emission of toxic components of exhaust gases, were quoted. The exhaust gas recirculation with the EGR valve, which allows supplying the exact amount of gases to the engine inlet system, is such an example. The advantages of using this type of solutions were described, and a typical construction solution was presented in the diagram. The paper was completed with a conclusion, which emphasised the importance of direct injection on reducing the emission of toxic components of exhaust gases.
Źródło:: Journal of KONES; 2015, 22, 4; 133-138
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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