Proceedings ArticleDOI
Fuel injection and combustion phenomena in a high speed DI diesel engine observed by means of endoscopic high speed photography
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In this article, the results obtained through observation of the following phenomena in a 0.5 litre HSDI Diesel engine are presented: the wall jet development and the role of swirl, the effect of wall temperature (cold and warm engine) on combustion development, and pilot injection on mixture formation and combustion; typical high speed films are presented supplemented by cylinder pressure, injector needle lift, rate of heat release, and light radiation (flame luminosity) intensity data recorded simultaneously by means of a digital acquisition system.Abstract:
After a short description of the Endoscopic High Speed Combustion Photography Technique used, the results obtained through observation of the following phenomena in a 0.5 litre HSDI Diesel engine are presented: the wall jet development and the role of swirl, the effect of wall temperature (cold and warm engine) on combustion development, and the effect of pilot injection on mixture formation and combustion. To document these phenomena, typical high speed films are presented supplemented by cylinder pressure, injector needle lift, rate of heat release, and light radiation (flame luminosity) intensity data recorded simultaneously by means of a digital acquisition system.read more
Citations
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Proceedings ArticleDOI
Modeling Engine Spray/Wall Impingement
Jeffrey Naber,Rolf D. Reitz +1 more
TL;DR: In this article, a computer model was used to study the impingement of sprays on walls, accounting for the effects of drop breakup, drop collision and coalescence, and the effect of drops on the gas turbulence.
Proceedings ArticleDOI
Modeling fuel film formation and wall interaction in diesel engines
Journal ArticleDOI
Multi-dimensional modeling of thin liquid films and spray-wall interactions resulting from impinging sprays
TL;DR: In this article, a multi-dimensional, fuel film model is proposed to simulate thin fuel film flow on solid surfaces of arbitrary configuration, which is achieved by solving the continuity, momentum, and energy equations for the two-dimensional film that flows over a three-dimensional surface.
Proceedings ArticleDOI
Characteristics of a diesel spray impinging on a flat wall
TL;DR: In this paper, the effects of ambient density, distance from the wall to the nozzle, and injection pressure on the impinging spray were analyzed, and the experimental equations of the radius and the height of the spray were proposed as functions of the above mentioned variables.
Proceedings ArticleDOI
Hydrodynamics of Droplet Impingement on a Heated Surface
Jeffrey Naber,Patrick V. Farrell +1 more
References
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Proceedings ArticleDOI
Investigation of Combustion in High Speed Direct Injection Diesel Engines Using a Novel High Speed Combustion Photography Technique
Journal ArticleDOI
High speed combustion photography with endoscopes in actual diesel engines: a new approach
Abstract: A new approach to high speed combustion photography consists in viewing the fuel injection and combustion process through specially designed endoscopes. Compared to conventional film techniques, the use of an endoscope as a photography system requires that very small windows be fitted into the cylinder head of the engine, thus causing minimal interference with the combustion process. The windows are made of fused silica to withstand the high gas temperature and pressure inside the combustion chamber of a diesel engine. The outcoming image from the endoscope is transmitted to the camera through several rigid optical relay systems, interconnected with rotating optical joints. A flash bulb located behind a second window is used to illuminate the nonluminous process of fuel spray formation during the ignition delay period.