Analysis on working performance of the swirl chamber diesel engine with a dual channel and an expansion angle

Based on the design principles of connecting passage, the article first proposed the idea of dual channel insert with expansion angle and designed three solutions which differed in the expansion angle between channel A and B by 0°& 0°, 5°& 10°, and 10°& 5°. Furthermore, the economic and emission characteristics of the swirl chamber were determined by conducting a bench test. Results indicate that the geometry of dual channel can promote the development of swirl, and a proper increase in the expansion angle of the channel has a positive effect on the development of the swirl in the swirl chamber. When the expansion angles of channel A and B are 10° and 5°, respectively, the swirl characteristic is relatively good, but experimental results show that the oil consumption rates of the Scheme at both the low and heavy load being at their least, which, respectively, are 3% and 3.2% lower than that of the original engine; and the corresponding exhaust transmission coefficients are also 72% and 9.7% lower than that of the original engine, respectively. And the economy and emission characteristics of the other two dual-channel schemes are also improved in some degree. The research results provide certain reference for the performance improvement of swirl chamber air-cooled diesel engine and are beneficial to the further design and optimization. © 2016 American Institute of Chemical Engineers Environ Prog, 2016