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| Effects of High Tumble Combustion System on the Performance of a Compact Turbocharged Gasoline Engine |
| DOI： |
| Key Words:gasoline engine turbocharged downsizing combustion system tumble ratio engine performance |
| Author Name | Affiliation | | XU Yuliang,QU Wei,ZU Bingfeng,WANG Zhen,Li Desheng,LIU Li’na | 1.Internal Combustion Engine Research Institute, Tianjin University, Tianjin 300072, China；
2.School of Mechanical Engineering, Tianjin University, Tianjin 300072, China |
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| Abstract:By the combination of 3D simulation and bench test, effects of medium and high tumble ratio combustion system of a three-cylinder turbocharged port-injection gasoline engine on the engine performance of combustion, power and fuel consumption were studied under full load conditions. Results show that the value of tumble ratio directly affects the moment of turbulent kinetic energy peak and the center of turbulent kinetic energy, which affects the flame development and propagation. The excessively high tumble ratio will cause the center of turbulent kinetic energy to eccentric and affect the flame propagation. The medium tumble ratio combustion system A facilitates the formation of flame core and the flame propagation, shortening the total combustion duration and improving the thermal efficiency. At low-to-medium speeds, the crank angle of 50% mass fraction burned （MBF50） by the medium tumble ratio combustion system A is 3.4°ahead of the value of the high tumble ratio combustion system B, while the indicated mean pressure cycle variation can be maintained at 3%. |
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