| Project/Area Number |
07650254
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Thermal engineering
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| Research Institution | The University of Shiga Prefecture |
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Principal Investigator |
SHIMAMOTO Yuzuru Dept.of Mechanical Systems Engineering, The University of Shiga Prefecture, Prof., 工学部, 教授 (40032916)
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| Co-Investigator(Kenkyū-buntansha) |
KAWAI Terunao Dept.of Mechanical Systems Engineering, The University of Shiga Prefecture, Inst, 工学部, 助手 (90275173)
YAMANE Kouji Dept.of Mechanical Systems Engineering, The University of Shiga Prefecture, Asso, 工学部, 助教授 (10210501)
ISSHIKI Yoshihiro Dept.of Mechanical Engineering, Setsunan University, Associate.Prof., 工学部, 助教授 (90116434)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1996: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1995: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Internal combustion Engine / Recirculation of Exhaust Gas / Intake and Exhaust systems / Gas Flow Analysis / Shock Wave / Performance Prediction / False Diffusion |
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| Research Abstract |
The technique of exhaust gas recirculation (EGR) is available for NOx reduction of gasoline and Diesel engines. The objects of research are to predict numerically EGR rate and also to estimate the differences in EGR rate between cylinders. The results obtained are as follows :
1. The EGR rate has been predicted in a 4-cylinder four-stroke cycle gasoline engine with high EGR system, using the characteristic method to analyze one-dimensional gas flow unsteadily. It has been validated from the comparison between the predicted results and the experimental data that this method is usual to investigate the differences in EGR rate between cylinders. It has been founded from the investigation of the gas flow in EGR systems that the differences in EGR rate between cylinders are produced not noly owing to the geometry of pipe system but also owing to the gas dynamics in intake and exhaust systems.
2. The behaviors of exhaust gas content and gas flow in intake and exhaust systems have been simulated with much less numerical diffusion by the characteristic method, in which two kinds of meshes are prepared. Much less numerical diffusion error is confiumed through the comparison between the predicted EGR rate and the experimental one. In order to improve the simulation accuracy of the unsteady gas flow in intake and exhaust system, it is important to incorporate shock wave schemes into the calculation program of gas flow in pipe systems. However, the calculation program with shock wave schemes has not yet completed owing to the complexity of program. Effort to complete the program is continued to the next year.
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