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Combustion Observation of OSKA-DH Diesel Engine by High-Speed Photography and Video System

Nippon Clean Engine Laboratory Co.-Shigeru Onishi
Kanazawa Institute of Technology-Satoshi Kato, Kenshi Fujita, Hideaki Tanabe, G. Takeshi Sato
Published 1996-05-01 by SAE International in United States
The OSKA-DH diesel engine employed a unique system (hereafter called OSKA system) which is composed of a single-hole fuel injector, an impinging disk and a re-entrant type combustion chamber.This study is concerned with the combustion observation of both OSKA-DH diesel engine and conventional DI diesel engine by the high-speed photography and video system. This video system enables us to take combustion photographs under the warm-up condition of the engine.From the observation of those photographs, the OSKA-DH engine shows the shorter ignition delay compared with a DI diesel engine and the combustion flame of OSKA-DH diesel engine are concentrated in the center of the combustion chamber and a relatively monotonous flame intensity are observed.THE AUTHORS HAVE DEVELOPED a new type of Direct Injection Stratified Charge Engine called “Direct Fuel Injection Impingement Diffusion Stratified Charge System” (hereafter called OSKA System).The authors have already reported the performance and exhaust emission of the methanol, gasoline and diesel engines utilizing this OSKA System (1), (2), (3), (4), (5), (6), (7), (8), (9), (10) and (11)*.In the previous reports (8), (9),…
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Development of OSKA-DH Diesel Engine Using Fuel Jet Impingement and Diffusion Investigation of Mixture Formation and Combustion

Nippon Clean Engine Laboratory Co.-Satoshi Kato, Shigeru Onishi
Kanazawa Institute of Technology-Hideaki Tanabe, G. Takeshi Sato
Published 1994-03-01 by SAE International in United States
This study is concerned with development of a new type of diesel engine using the fuel jet impingement (OSKA-DH).Simultaneous reduction of the NOx and smoke emission were demonstrated with single cylinder prototype OSKA-DH engine.As a fundamental study on the mixture formation process, the observation of impinged fuel spray was studied by using a pressurized constant volume vessel. The high-speed combustion photographs of both re-entrant and open type combustion chamber were also taken by using the experimental transparent engine.From the observation of pressurized vessel and high-speed combustion photographs, the mixture formation and combustion was strongly affected by the squish flow velocity. The short ignition delay and faster combustion were observed by the re-entrant type combustion chamber because of high squish speed.
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Photographic Study of Spray Impinging onto a Projection on a Wall

Nippon Clean Engine Laboratory Co.-Satoshi Kato, Shigeru Onishi
Kanazawa Institute of Technology-Hideaki Tanabe, Masashi Takahashi, G. Takeshi Sato
Published 1993-10-01 by SAE International in United States
As a fundamental work on Direct Injection Impinging Diffusion Combustion Engine, fuel spray was injected momentary into a pressured CO2 gas and impinged onto a projection on a wall. Instantaneous photograph was taken and analyzed to clarify the spray characteristics. Nozzle opening pressure was varied to clarify its effects on spray characteristics. Nozzle needle was cut to form two pairs of flats on needle surface instead of its cylindrical one. The effect of this needle shape was also studied.Opening pressure of injection nozzle has produced very little effect on the spray tip penetration. Spray thickness is larger when needle opening pressure of injection nozzle is high.Spray tip penetration and spray thickness have become large when widths across flats is narrow.
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