Autor: Jaworski, P. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Comparison of breakup models in simulation of spray development in direct injection SI engine
Autorzy:: Ćwikowski, P.
Jaworski, P.
Teodorczyk, A.
Powiązania:: https://bibliotekanauki.pl/articles/247550.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: direct injection
combustion
gasoline
breakup models
SGDI
Opis:: Nowadays the wide range of spark ignition (SI) engines with spray guided direct injection (SGDI) is in production. Spray development is playing a major role in advanced engine design with three-dimensional computational fluid dynamics (CFD). Nevertheless still there is a need for improvement in CFD injection simulations because of the high pressure injection. The high pressure injection influences the drop breakup, coalescence and evaporation which are critical for proper representation of simulated phenomenon. Computer codes, like FIRE, give a possibility to simulate the process of injection with various types of breakup models. In spite of the importance of atomization, mechanisms of breakup are still not well understood. To obtain better understanding of breakup models simulations have been performed for the engine combustion chamber with inlet andoutlet system and SGDI strategy. For that the model was at first constructed and then imported to the Fire code. After meshing process the model has 2 million cells. The engine is not boosted and as fuel the ethanol is used. The calculations were performedfor 3500 rpm. The influence of different breakup regimes on the spray shape is presented in this study. Comparison is made for Wave, TAB (Taylor Analogy Breakup) and Reitz-Diwkar breakup models.
Źródło:: Journal of KONES; 2010, 17, 4; 123-130
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Jet and droplet breakup modelling approaches
Autorzy:: Kapusta, Ł. J.
Jaworski, P.
Kowalski, J.
Powiązania:: https://bibliotekanauki.pl/articles/245813.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: spray
modelling
simulation
breakup
injection
CFD
computational fluid dynamics (CFD)
Opis:: Three-dimensional computational fluid dynamics (CFD) plays important role in engines development. The mixture formation in a direct-injection piston engines poses a huge challenge in successful simulations of the engine processes. It is due to the fact that the spray as a two-phase flow complicates the computational process. Moreover, this multiphase flow is not uniform. Three main zones, depending on the distance from the nozzle exit are visible when a liquid is injected. Very dense so called “thick” in a direct vicinity of the injector hole, than “thin” as a result of pri-mary breakup downstream the injector and finally in the certain distance from the injector appears “very thin” region as a result of secondary breakup. It is important to take into account that the liquid phase in various regimes behaves differently and is under influence of different phenomena. The modelling approach needs to take in to consideration all those elements. This paper focuses on presentation of the theory and numerical models for primary and secondary breakup phenomena. The primary breakup is a process that results from a combination of three mechanisms: turbu-lence within liquid phase, implosion of cavitation’s bubbles and aerodynamic forces acting on a liquid jet. Secondary breakup regime occurs mainly due to the aerodynamic interactions between the liquid and the gaseous phase.
Źródło:: Journal of KONES; 2015, 22, 3; 83-90
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Laser based diagnostic system for spray measurements
Autorzy:: Kapusta, Ł. J.
Jaworski, P.
Teodorczyk, A.
Kowalski, J.
Powiązania:: https://bibliotekanauki.pl/articles/244911.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: spray
shadowgraphy
Mie scattering
LIF
laser-induced fluorescence
Opis:: The paper discusses the capabilities of the laser diagnostic system for dispersed multiphase flows measurements, which was recently commissioned at the Institute of Heat Engineering (ITC) at Warsaw University of Technology. The system presented in the paper is multifunctional and is capable to use different measurements techniques such as shadowgraphy, Mie scattering (scattering on the gas-liquid interface) and LIF (laser induced fluorescence). It provides possibility of switching from one technique to another depending on the characteristics of the observed combustion/injection mixing process. The operational features are discussed in-detail. The study presents the required and possible system setups. Special attention was focused on the system components, which are needed for relevant measurement techniques. Moreover, the limitations of the measurement techniques are discussed and the example measurements are presented. The study shows that using different techniques extends the measurement capabilities of the system with minimum investment costs. This results from the fact that certain system components for different techniques are the same. Moreover, one can conclude that the system design allows certain measurement methods to be applied simultaneously, which results in synergy by making possible drawing more advanced conclusions on observed phenomena
Źródło:: Journal of KONES; 2015, 22, 3; 91-98
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: SCR systems for NOx reduction in heavy duty vehicles
Autorzy:: Jaworski, P.
Kapusta, Ł. J.
Jarosiński, S.
Ziółkowski, A.
Cortes Capetillo, A.
Grzywnowicz, R.
Powiązania:: https://bibliotekanauki.pl/articles/245426.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: NOx
SCR
urea
ammonia
exhaust
emissions
aftertreatment
heavy-duty vehicle
Opis:: Air pollution has become an important worldwide problem. The European Commission credits road and water transport as the major source of NOx pollution, and of being responsible for around 50% of the total air pollution in urban areas. In Poland, around 45% of the country NOx emissions are attributed to transportation. During the last decade, the use of SCR technologies have gained popularity as a method for NOx reduction, the technology is widely considered as one of the solutions for road transport emissions. SCR technology had previously been employed in stationary plants, maritime transportation and other installations using combustion processes in which exhaust conditions are easier to control. The advance on the technology led to the introduction of the first heavy-duty vehicle with an SCR system into the market in 2004. New technologies and applications are constantly appearing, for example, SCR exhaust gas cleaning systems for reciprocating engines are still under development and compression ignition engines can be found in a number of different applications. The technology still needs to be studied and improved as constant problems and knowledge is required in issues such as urea injection, crystallization and NOx reduction efficiency. Moreover, the designs intended for heavy duty vehicles need to meet vehicle limitations and EURO emissions restrictions. This paper presents a review of the different SCR system designs derived from the various factors and regulations in the automotive industry, which have influenced the technology, along with a parametric study of a proprietary SCR system for heavy-duty application.
Źródło:: Journal of KONES; 2015, 22, 4; 139-146
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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