发动机可变长度进气歧管的设计与优化

本文叙述了一款自然吸气发动机可变长度进气歧管的设计及优化工作。对现在进气歧管方案中存在的性能问题提出了两级可变长度进行优化。利用GT-power软件探究了进气歧管长度、管径变化对该发动机的影响,并确定了可变长度进气歧管主要参数。在此基础上,提出了4个可变长度进气歧管结构方案。对各方案进行了发动机一维性能模拟计算,选出最优方案并进行了台架试验验证。优化后的进气歧管在各转速下均具有较好的动力性。

In this article, the design and optimization of a variable intake manifold was described. In order to improve the engine performance, two-step variable length of intake manifold was adopted. The impact of variety lengths and diameters of the runners to the engine was explored with GT-power. On the basis of that, four design plan of variable-length intake manifold was proposed. After analyzing the results of engine performance one-dimensional simulation the variable-length intake manifold design was determined. The Optimized intake manifold has better power performance at most engine speed.