Wszystkie pola: thermal process - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Evaluation of the thermal degradation process within the steam power plants heat exchangers
Autorzy:: Hajduk, T.
Powiązania:: https://bibliotekanauki.pl/articles/244895.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: steam power plants
fouling of heat transfer surface
thermal degradation determinants
Opis:: The consequence of the deposits presence on the heat transfer surface of the following heat exchangers: shell-and-tube condensers, the regenerative feed water exchangers, are commonly the loss of heat exchanger capacity, owing to the high value of heat conductive resistance of fouling. The process is more often defined as the thermal (heat) degradation of a given heat transfer device. The symptoms of heat degradation are usually defined as the difference between the values of thermal-flow parameters for the current and the reference state. Moreover, this process always entails an increase in the cost of energy conversion, leading to increasing the emission output of greenhouse gases consequently increasing the environmental degradation. It is worth mentioning that deposits settled on the waterside of heat transfer surface could also initiate the process of tubes obliteration. This phenomenon is characteristic for condensers cooled by seawater in particular. Reducing internal diameter of any single heat exchanger pipe by the deposits cause the rise in flow resistance and also reduce the condenser cooling water pump capacity. Ultimately, it leads to the reduction in water flow rate, resulting in an additional increase in the resistance of heat transfer. Furthermore, reducing the flow rate of cooling water causes the enhancement of the fouling settling rate. The paper describes the above-mentioned phenomena and presents the quantitative determinants of the thermal degradation description for heat exchangers based on the results of the author’s own experimental research.
Źródło:: Journal of KONES; 2016, 23, 4; 127-133
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Investigation of the turbofan with mixer engine model sensitivity of thermal-flow process modification in the engines components
Badania wrażliwości modelu silnika dwuprzepływowego z mieszalnikiem strumieni na zmianę efektywności procesów przepływowo-cieplnych w zespołach silnika
Autorzy:: Jakubowski, R.
Powiązania:: https://bibliotekanauki.pl/articles/244315.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: silniki lotnicze
silniki odrzutowe
modelowanie silników odrzutowych
charakterystyki silnika odrzutowego
aircraft engines
turbojet engines
modelling of turbojet engines
turbojet engine characteristics
Opis:: The turbofan with mixer engine model sensitivity of the thermal-flow processes effectiveness in the engine components changes was analyzed. The model of turbofan engine with the mixed exhaust stream is so complicated to use the small deviation methods to solve this problem. On that reason the own author methods to analyze this problem was proposed. During investigation it was revealed that the changes of some processes effectiveness leads to change of pressure inflow to the mixer and this cause to change of mixer process effectiveness. The mixer pressure drop coefficient decries so slightly but it should be taking into consideration during exact calculations. In the main parts of paper the results of simulation of engine work parameters sensitivity of the thermal-flow processes effectiveness changes is presented and discussed. The specific thrust and specific fuel consumption were chosen as the engine work parameters. The model responds for change of internal process effectiveness in all range and for small step was analyzed. The conclusions are presented in final parts of the paper. The essential influence on relations between the change of the efficiency of rotor sets and with specific parameters has compression rate of compressor. Generally the improvement performers of the excellence processes give better effects at the lower temperature value in front of the turbine.
Źródło:: Journal of KONES; 2007, 14, 4; 119-126
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Thermal barrier concepts against continuous laser irradiation
Autorzy:: Lenarczyk, M.
Domański, R.
Powiązania:: https://bibliotekanauki.pl/articles/241871.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: laser weapons
thermal barriers
multilayer structures
phase-change process
thermal contact resistance
Opis:: Rapid development in the high-power laser technology poses new requirements on the thermal protective materials. Military laser applications have been characterized and the examples have been presented. Existing materials, which may be used as a protection against high-energy laser beam, have been discussed. Several concepts of the new thermal barrier materials have been proposed. The proposals include multilayer structures, porous materials, systems with phase change materials (PCMs), and systems with various thermal contact resistance for different contact pairs. Comparative study based on numerical simulation results has been performed to assess efficiency of each proposal. Three major candidate technologies were considered: the CO2 laser, the HF/DF chemical laser, and the Nd-glass solid-state laser. The CO2 combustion driven gas laser was built in mid-seventies. Its power was 500 kW with the poor beam quality. In the context of thermal protection against laser, high conductive material component in a complex structure might be especially useful, since irradiated surface is usually limited to a small size.
Źródło:: Journal of KONES; 2018, 25, 2; 231-238
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Determination of thermal efficiency of the spark ignition systems
Autorzy:: Sendyka, B.
Mitianiec, W.
Noga, M.
Wachulec, W.
Powiązania:: https://bibliotekanauki.pl/articles/246099.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion process
ignition system
thermal efficiency
spark plug
CNG
Opis:: The paper presents results of measurements performed to determine thermal efficiency of spark ignition systems. Because of small pressure change after sparking process smali volume chamber has been proposed for measurements. A direct measurement method of pressure increment determination has been chosen. In this method one pressure chamber is used. The caloric chamber isfilledwith nitrogen, which is a neutral gas. It is preferable medium than air because it is one-component gas and it has a precisely-known value of a specific gas constant. The value of speciflc gas constant is reąuested to calculate a value of discharge energy given to the gas. In the chosen method pressure increment in the chamber during spark discharge is measured. The pressure increment in the chamber during ignition is strictly related to the energy of spark discharge. The energy balance calculations determined values of heat los s es for two types of electrodes (normal and "thin") anddifferent initial pressure (p=0 bar and p=25 bar). The maximal value of the thermal efficiency was observedfor the higher value of pressure in chamber and thin electrodes of spark ping. It was also stated, that the higher thermal efficiency for" thin " spark ping electrodes is a result of reduced heat transfer. The paper presents results of the tests carried out in the caloric chamber of 4. l cm3 filled with nitrogen at ambient temperature using PCB transducer direct measurement method. Results of the measurements done using differential pressure transducer for the same parameters like in thefirst measurement method were similar.
Źródło:: Journal of KONES; 2010, 17, 1; 365-371
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Thermal analysis and thermovision laboratory tests of electric brakes
Autorzy:: Domański, R.
Grygorcewicz, P.
Powiązania:: https://bibliotekanauki.pl/articles/242600.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: laboratory testing
electric brake
temperature test
braking process
thermovision
Opis:: The purpose of this article was to show two thing thermal issues theory and thermovision tests in the laboratory. The main idea of this article was to describe the thermal issues theory of interesting problem base on the thermovision tests of new type electric brake prototype. After the creation of new product the designer needed to know how behave the prototype of the brake during tests with higher energy which could increase the temperatures on the object in our case of the electric brake prototype. The first step in that kind of issues was thermal analysis, which is very useful to define and subscribe the thermal issues. The second step it was measurement of the temperature, which was really significant during the electric brake tests. It was really important to check the temperature of engines. If there was some influence to the brake during braking. One of the method was using special thermal camera. The camera was checking the temperature during whole test after beginning the test to the end of the trial. The full spectrum of the temperature allowed the author to verify if there was some influence of temperature to the new electric brake prototype. The thermocouple was other type of sensors, which was normally used in our laboratory methodology to check temperature during the test. The pyrometer was other type of the method, which was used to measure the temperature after the test. The results of this measurement were subscribed in this article.
Źródło:: Journal of KONES; 2018, 25, 4; 125-131
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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