排气管结构对多缸增压柴油机进气不均匀性的影响

Influence of Exhaust Pipe Structure on Intake Non-Uniformity of Turbocharged Multi-Cylinder Diesel Engine

作者在某V型8缸柴油机性能试验和多个气缸压力测量的基础上,对该柴油机的一维性能仿真计算模型进行了标定和校核,并应用验证后的模型计算和分析了该柴油机采用脉冲增压排气管、等压增压排气管、MPC排气管时各缸进气流量的不均匀性及其差异.结果表明:采用不同的排气管结构时各缸进气不均匀度的差异很大,采用等压、MPC排气管时的进气不均匀度比较接近,而采用脉冲排气管时的进气不均匀度比前两者小得多.

A one-dimensional performance simulation model of a V-type turbocharged eight- cylinder diesel engine was established and calibrated by experiment and test. Then, the differences of intake non-uniformity among three types of pipes, pulse charging exhaust pipe, constant pressure charging exhaust pipe and MPC exhaust pipe, were calculated and analyzed with the use of this calibrated model. The computed results indicate that different exhaust pipe structures lead to great difference of intake non-uniformity. The intake non-uniformity of constant pressure charging exhaust pipe is close to that of MPC exhaust pipe. But the non- uniformity of the pulse charging exhaust pipe is much smaller than both of above.