柴油机性能优化及顾氏系统的研究

A Study on Gu System and the Optimization of Diesel Performance

本文利用统计学和优化理论，提出了网格快速优化方法，计算时间为其同类方法的７０％，适应性更强，可以达到更高的精度，适用于大型复杂优化问题的精细计算。据此以一超高增压柴油机为例，研究了顾氏系统及其对柴油机性能的改善，得到如下结论：（１）ｐｍｅ＝２．５ＭＰａ时顾氏系统可以代替相继增压系统和高工况放气系统，油耗率及ＮＯｘ排放量降低，而且具有良好的加速与起动性能；（２）顾氏系统采用相继增压方式，可以大幅度拓宽柴油机低速ｐｍｅ范围，进一步改善多机并联工作的舰船低速巡航经济性；（３）ｐｍａｘ限制越严格，顾氏系统改善柴油机性能的效果越好。

Based on the theory of statistics and optimization,here is proposed a fast network optimization method(F.N.O.M.),which when compared with the other N.O.M.the computer time is reduced to 70% with a much wider adaptability,higher precision,and so more suitable for elaborate large scale optimization calculation.Using the F.N.O.M.,a study on Gu system for performance of supercharged diesel in whole load range is carried out with the following conclusions:(1)Gu system can entirely substitute the waste gate turbocharging system and sequential turbocharging system(S.T.C.)with reduced NO x emission and much lower be while p me reached to 2.5 MPa,and the acceleration response and warm up performance of diesel can be guaranteed;(2)the maximum of p me within low speed range can be drastically increased if Gu system combined with S.T.C.,which will contribute to the be reduction for multi engine boat cruise;(3)the stricter the limitation of p max ,the much more the improvement of performance of supercharged diesel with Gu system.