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

Kanazawa Institute of Technology-Satoshi Kato, Kenshi Fujita, Hideaki Tanabe, G. Takeshi Sato
Nippon Clean Engine Laboratory Co.-Shigeru Onishi
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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Particulate Emission Characteristics from an Impingement Diffusion Direct Injection Diesel Engine

Kanazawa Institute of Technology-Hideaki Tanabe, Masashi Takahashi, G. Takeshi Sato
Nippon Clean Engine Lab.-Satoshi Kato, Shigeru Onishi
Published 1994-10-01 by SAE International in United States
A new mixture formation and combustion process for reducing both emissions and fuel consumption has been developed, where the fuel impinges onto the impinging surface and spreads into the free space, named the OSKA process. A single cylinder engine particulate emission test was conducted with full flow dilution tunnel. The OSKA process shows lower TPM (total particulate matter) emission than the conventional DI diesel at the corresponding operating condition.ISF(insoluble fractions) and SOF(soluble organic fraction) are lower than DI diesel's. Correlation between SOF and THC of OSKA engine is, however different from that of conventional DI diesel. OSKA emits lower THC than conventional DI diesel does at the same SOF emission. This is because the wall quenching effect is smaller in OSKA than in conventional DI diesel.A NEW MIXTURE FORMATION and combustion technology, impinging diffusion one named OSKA, has been developed by the authors. The authors have reported the exhaust and performance characteristics of the OSKA system. The OSKA system has relatively low exhaust emission characteristics as well as low fuel consumption performance(1, 2 and 3).…
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Investigation of Mixture Formation and Combustion of Newly Developed Diesel Engine Using Fuel Jet Impingement (Oska-Dh)

Kanazawa Institute of Technology-Hideaki Tanabe, G. Takeshi Sato
Nippon Clean Engine Lab. Co.-Satoshi Kato, Shigeru Onishi
  • Technical Paper
  • 94A067
Published 1994-03-16 by Associazione Tecnica Dell'Automobile in Italy
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 a 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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Development of OSKA-DH Diesel Engine Using Fuel Jet Impingement and Diffusion Investigation of Mixture Formation and Combustion

Kanazawa Institute of Technology-Hideaki Tanabe, G. Takeshi Sato
Nippon Clean Engine Laboratory Co.-Satoshi Kato, Shigeru Onishi
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

Kanazawa Institute of Technology-Hideaki Tanabe, Masashi Takahashi, G. Takeshi Sato
Nippon Clean Engine Laboratory Co.-Satoshi Kato, Shigeru Onishi
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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Development of Low NOx Emission Diesel Engine by Impingment of Fuel Jet

Kanazawa Institute of Technology-Hideaki Tanabe, G. Takeshi Sato
Nippon Clean Engine Lab. Co.-Satoshi Kato, Shigeru Onishi
Published 1992-09-01 by SAE International in United States
This study is concerned with development of a new type of Diesel engine by impingement of fuel jet. The impinging part is installed on the cylinder head (OSKA-DH), against which the fuel jet is injected to spread and form fuel-air mixture.As a fundamental study on the mixture formation process, the observation of the impinged fuel jet was studied by using a pressurized vessel. High-speed combustion photographs of the OSKA and DI Diesel engine were also taken by using the experimental transparent engine.A single cylinder 4 stroke cycle prototype OSKA-DH engine (ø 118 x 108 mm) was developed. Pintle type single hole fuel injector is used and relatively low opening pressure of 15.3 MPa is employed.The re-entrant type combustion chamber and relatively high compression ratio of 20.4: 1 are employed.Experiments with a single cylinder proto-type engine showed that the lower NOx and smoke emissions compared with the conventional DI diesel engine.Low combustion noise was observed and confirmed by the cylinder pressure analysis.
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Development of Low Nox Emission Diesel Engine By Impingement of Fuel Jet (Oska-Dh)

Kanazaawa Institute of Technology-Hideaki Tanabe, G. Takeshi Sato
Nippon Clean Engine Research Center-Satoshi Kato, Shigeru Onishi, Takeo Kimoto
  • Technical Paper
  • 928440
Published 1992-07-14 by Society of Automotive Engineers of Japan in Japan
This study is concerned with development of a new type of diesel engine by impingement of fuel jet. The impinging part is installed on the cylinder head (OSKA-DH) and the fuel jet injected against the impinging part, spreads and forms fuel-air mixture. Pintle type fuel injector is used and relatively low opening pressure is needed. The re-entrant type combustion chamber is employed. Experiments with single cylinder 4-stroke cycle prototype engine (φ118 X 108 mm) showed that the lower NOx and smoke emissions compared with the conventional DI diesel engine. The observation of the impinged fuel jet by using a pressurized vessel and combustion photographs were also done.
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Performance of Direct Injection Methanol Engine By Impingement and Diffusion of Fuel Jet-Comparison of Spark and Glow Plug Ignition

Nippon Clean Engine Lab. Co.-Satoshi Kato, Shigeru Onishi
  • Technical Paper
  • 918270
Published 1991-10-02 by Society of Automotive Engineers of Japan in Japan
The object of this paper is to compare the performance of direct fuel injection methanol engine to the spark and glow plug ignition system. The brake thermal efficiency (maximum value of 42%) are almost same for both ignition noise and NOx emission are lower than the spark plug engine. NOx emission is not exceed 500 ppm with the glow plug ignition system.
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Performance of Glow Plug Assisted Direct Injection Methanol Engine by Impingement of Fuel Jet(OSKA-F)

Nippon Clean Engine Lab. Co. Kanazawa, Japan-Satoshi Kato, Shigeru Onishi
Published 1991-09-01 by SAE International in United States
The authors previously reported the performance of the “Stratified Charge Methanol Engine by Impingement of Fuel Jet (OSKA System) with Spark Plug Ignition.” In that report, the impinging part was installed in the center of the piston cavity and a spark plug was used for ignition.In this report, the impinging part is installed on the cylinder head and a glow plug is used for ignition.A single-hole fuel injector (throttle type) is used. The centerline of the fuel injector coincides with that of the impinging part.A relatively low opening pressure (7.MPa) of the fuel injector is needed for this OSKA system. The fuel is injected against the impinging part, spreads and forms the fuel-air mixture.A glow plug is located just beside the impinging part.Experiments with a single-cylinder 4-stroke cycle prototype engine (bore × stroke = 94 × 90 mm) showed that the maximum Brake Mean Effective Pressure (BMEP) was 1.04 MPa and the Maximum Brake Thermal Efficiency was 41.9 % (429.6 g/kW.h). The NOx emission was lower than that of the Diesel engine and the Unburnt…
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New Type of Diesel Engine by Impingement of Fuel Jet (OSKA-D)

Nippon Clean Engine Lab. Co. Kanazawa, Japan-Satoshi Kato, Shigeru Onishi
Published 1990-09-01 by SAE International in United States
The new type of Diesel combustion engine has been developed.The new Idea Incorporates an impingement part in the central piston cavity. The fuel jet is injected against the impingement part, spreads and form fuel-air mixture.Single hole fuel injection nozzle is used and the relatively low opening pressure is needed. Intake air swirl is not needed.The re-entrant type combustion chamber is employed to get a relatively strong squish speed. Experimental with single cylinder 4 stroke prototype test engine showed that the brake mean effective pressure was 0.82 MPa and the maximum net specific fuel consumption was 220 g/kW.h. The NOx and smoke emissions was reduced compared with the conventional DI Diesel engine.The authors have developed a new type of Direct Injection Stratified Charge SI engine called “Direct Fuel Injection Impingement Diffusion Stratified Charge System” (hereafter called OSKA). The authors have already reported on the performance and exhaust emissions of the methanol and gasoline spark ignition version 4 stroke engines utilizing this OSKA system(1), (2), (3) and (4)*.Now, the authors report about development of OSKA Diesel version…
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