柴油机缸体上水孔流量测量方法对比

摘要

Several comparative studies on flow measurement methods for Diesel cylinder water hole were finished. An accuracy comparison test benchandaflow field effect comparison test benchwereestablished.To verify the results, real machine measurementexperiments and the comparison between simulation and experiment were carried out.The results show that the electromagnetic method and turbine method haverelatively low average error through the whole flow range;the errors of all methods becomegreaterwhen flow & caliber decrease, especially for electromagnetic method and pore-plate method whoserelativeerror even exceed 5%.The flow field effects of all methods becomegreaterwhenthe flow increases(approximately followedby linear of index); the effects of electromagnetic method & turbine methodare smallerthan others.The maximum flow measurement relative error was lower than 2.5% and the average relative erroris lower than 1.5%. The pressure loss range and variation tendencyare basically consistent with simulation tests. Comparative resultsare proved to be effective.%针对柴油机缸体上水孔的流量测量方法进行不同测量方案的对比研究。通过搭建精度模拟试验台对测量误差进行研究，利用流场影响模拟试验台对流场影响进行研究，为验证对比研究结果，进行上水孔实机测量试验及试验与仿真的对比研究。研究结果表明：在整个流量范围内电磁式、涡轮式的流量平均误差较小，各测量方法的流量误差随着流量及管径的减小而增大，电磁式及孔板式的变化较为明显，流量相对误差甚至超过5%。各测量方法对流场的影响随流量的增大而增加，电磁式和涡轮式影响较小。各上水孔流量最大相对误差在2.5%以下，平均相对误差在1.5%以下，且上水孔压力损失范围与趋势和模拟试验的结果也基本一致，证明测量方案的对比研究结论是有效的。