SOFIM柴油机气波增压研究

Study on SOFIM Pressure Wave Supercharged Diesel Engine

将SOFIM涡轮增压中冷柴油机改造成气波增压中冷柴油机。匹配气波增压器的柴油机需重新设计进、排气管,根据气波增压的要求,采用进气均匀性更好、总管容积更大的进气管及中央出口渐扩式排气管,采用变频电机优化增压器转子与曲轴间的传动速比,使得在整个发动机工况内均能实现较高的增压比。试验结果表明,气波增压柴油机的动力性和排放性能在低转速下优于原机,在中高转速下比原机差,通过设计容量更大的进、排气管及进一步优化速比可改善气波增压柴油机在高工况下的性能。

In this paper, a SOFIM turbocharged diesel was modified into a pressure wave supercharged diesel engine. The intake manifolds and exhaust pipes need to be redesigned to match the pressure wave supercharger. Intake manifolds with better intake uniformity, larger surge volume and central port divergent exhaust pipes were adopted. The inverter motor was used to optimize the transmission ratio between PWS rotor and engine crankshaft to accomplish higher charge ratio over whole engine operating range. Experimental results showed that PWS is superior to turbocharging at low engine speeds and inferior to turbocharging at medium-to-high engine speeds in power and emissions. The PWS engine performance under high speed operating conditions could be improved by using larger intake surge volume and exhaust pipes and further optimizing the transmission ratio.