高压差进气道流动仿真及实验研究

摘要

对柴油机高压差进气道内的流动展开研究.基于AVL软件包建立了高升功率柴油机高压差进气道仿真模型,该模型包含三维稳态分析与一维非定常分析模型,并对高压差进气道进行三维计算流体动力学(CFD)稳态分析,利用分析结果对一维非定常模型进行气门流通系数修正.根据修正的仿真模型进行高升功率柴油机高压差进气道改进设计,经高压差稳态试验验证,所设计的进气道具有良好的进气性能.%The study focuses on the flow in the intake port of a high-specific-power diesel with high pressure drop. A numerical model for such intake port was built by AVL BOOST and AVL FIRE. The model consists of a ID unsteady model and a 3D steady one. 3D steady flow of the gas intake port in the diesel with high pressure drop was analyzed. The intake valve flow coefficient of the ID unsteady model was modified using the 3D numerical result. Then the intake port of such diesel was improved on the basis of the modified numerical model. It can be known from the high-pressure-drop steady flow test that the improved gas intake port provides a fine gas intake performance.