Scavenging Characteristics of Diesel Engine Based on Transient Flow Measurement

XING Wenting; WANG Zhaowen; HU Wenhao; YIN Yong; ZHAO Yanting; HUANG Ronghua

Vehicle Engine ›› 2022, Vol. 0 ›› Issue (4) : 1-7.

XING Wenting¹,WANG Zhaowen¹,HU Wenhao¹,YIN Yong²,ZHAO Yanting²,HUANG Ronghua¹

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Abstract

In order to research the scavenging characteristics of a heavy-duty 4-stroke diesel engine, the high-precision transient flow measurements in intake manifold,cylinder and exhaust manifold were first carried out, the accurate waveform of inlet pressure-cylinder pressure-exhaust pressure was obtained. Then the scavenging characteristics of heavy-duty diesel engine in all working conditions and the deterioration of internal combustion engine performance due to poor scavenging were analyzed. In order to further optimize the scavenging quality and the performance parameters of diesel engine, the numerical simulation of working process was established by GT-Power software, and the model was verified by test data. Based on the control requirements of exhaust pressure waveforms, the effects of exhaust manifold length, exhaust manifold diameter, combination of exhaust manifold length and diameter, and scavenging phase on scavenging characteristics and intake capacity of diesel engine were studied. Based on the influence law, the scavenging performance of heavyduty diesel engine was optimized, the coefficient of residual gas decreased by 5.37%，and the all working performance improved obviously.

Key words

heavy-duty diesel engine / transient flow measurement / scavenging characteristic / working process / numerical simulation

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XING Wenting,WANG Zhaowen,HU Wenhao,YIN Yong,ZHAO Yanting,HUANG Ronghua. Scavenging Characteristics of Diesel Engine Based on Transient Flow Measurement[J]. Vehicle Engine. 2022, 0(4): 1-7