Influence of Compressor-End and Turbine-End Bypass on Soot Emission

LI Xuantao; WU Yi; YAN Yan; ZUO Zinong; HAN Zhiqiang; WANG Jian

Vehicle Engine ›› 2025, Vol. 0 ›› Issue (1) : 27-33.

LI Xuantao¹，WU Yi^2，3，4，YAN Yan^2，3，4，ZUO Zinong^2，3，4，HAN Zhiqiang^2，3，4，WANG Jian⁵

Author information +

History +

Abstract

The study was conducted on a WP12 heavy-duty diesel engine to investigate the impact of bypass at the compressor-end and the turbine-end of a two-stage turbocharging system on ignition delay, peak cylinder temperature, and fuelair equivalence ratio, and the influence of their differences on soot emission. The results indicated that both bypass methods could achieve nearly the same intake pressure. Under the test conditions, the soot emission with compressor-end bypass was significantly higher than that with the turbine-end bypass. The difference of soot emission first increased and then decreased with the increase of intake pressure. The ignition delay of the turbineend bypass was longer than that of the compressor-end bypass, but the difference change in ignition delay was small. The correlation coefficient between ignition delay and soot emission was only 0.35. The peak cylinder temperature with the compressor-end bypass was notably higher than that with the turbine-end bypass. At high intake pressures, the difference of peak cylinder temperature had a more pronounced effect on soot emission, with a maximum correlation coefficient of 0.95. The fuel-air equivalence ratio with the compressor-end bypass was higher than that with the turbine-end bypass, which indicated that the turbine-end bypass allowed a greater intake flow. At low intake pressures, the difference of fuelair equivalence ratio had a more significant impact on soot emission, with a large correlation coefficient of 0.75.

Key words

two-stage turbocharging / bypass valve / soot / ignition delay / peak cylinder temperature / fuel-air equivalence ratio

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

LI Xuantao，WU Yi，YAN Yan，ZUO Zinong，HAN Zhiqiang，WANG Jian. Influence of Compressor-End and Turbine-End Bypass on Soot Emission[J]. Vehicle Engine. 2025, 0(1): 27-33