Numerical Simulation of the Gas Flow Accompanied by Pressure Wave Propagation and Diffusion Phenomena in Internal Combustion Engines

内燃机中气体流动伴随压力波传播和扩散现象的数值模拟

• 批准号: 04650186
• 负责人: SHIMAMOTO Yuzuru
• 金额: $ 1.34万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650186/
• 关键词: Internal Combustion Engine; One-Dimensional Gas Flow Analysis; Intake and Exhaust Systems; Three-Dimensional Gas Flow Analysis; Intake and Exhaust Noises; Gas Jets; Turbulent Diffusion Phenomena; False diffusion

It is important to reduce the numerical error, that is, false diffusion error in order to improve the simulation accuracy of unsteady gas flows in internal combustion engines. The results obtained through the investigation of various methods are as follows :1. By using the CIP method with high accuracy because its false diffusion is very small, the diffusion process of injected gas due to vortex motion has been made clear. Furthermore, the diffusion process of the mixture of fuel gas and air in a spark ignition engine has been numerically analyzed by the CIP method, and the process of stratified mixture formation has been shown. By incorporating fuel spray models into the calculation program to numerically analyze the process of mixture formation in a port-fuel-injection engine, the behavior of fuel droplets and the distribution of fuel vapor concentration have been predicted.2. In predicting the engine performances, it is necessary to evaluate various gas flows in exhaust systems. The method based on characteristics has been developed for the gas flow in a tapered pipe and also for the gas flow with the steep change of temperature. Applying this method to the prediction program, the optimization problem of engine systems has been discussed. The results shows that the program is useful in developing the engine systems.3. In three-dimensional analysis of gas flow including pressure wave, a method has been investigated for predicting the effects of the configurations of silencers on both the pressure losses and the acoustic characteristics in the silencer. By comparing the calculated pressure losses to the experimental ones, it has been confirmed that the method enables one to predict the trend of change of the pressure losses to the dimensions of silencer.

为了提高内燃机非定常气体流动的数值模拟精度，减小数值计算误差即伪扩散误差是非常重要的。通过各种方法的研究，得到以下结果：1.由于CIP法的假扩散很小，因而精度很高，从而清楚地反映了喷射气体由于旋涡运动而产生的扩散过程。在此基础上，采用CIP方法对火花点火发动机中燃气-空气混合气的扩散过程进行了数值分析，揭示了分层混合气的形成过程。通过将燃油喷雾模型引入到计算程序中，对进气道喷射发动机混合气形成过程进行数值分析，预测了燃油液滴的运动规律和燃油蒸气浓度的分布.在预测发动机性能时，需要对排气系统中的各种气体流动进行评估。本文提出了一种基于特征线的变截面管道内气体流动的计算方法，并对温度突变的气体流动进行了计算。将此方法应用于预测程序中，讨论了发动机系统的优化问题。结果表明，该程序对发动机系统的开发具有一定的指导意义.在考虑压力波的三维气体流动分析中，研究了一种预测消声器结构对消声器内压力损失和声学特性影响的方法。通过对消声器压力损失计算值与实验值的比较，证实了该方法能够预测消声器压力损失随消声器尺寸变化的趋势。

项目成果

Tomoyuki WAKISAKA: "A Fundamental Study on Numerical Analysis of Spray Behavior in Fuel Injection Engines" Proceedings of the 68th Annual Meeting of JSME, Kansai Branch. No.934-2. 215-217 (1993)

Tomoyuki WAKISAKA：“燃油喷射发动机喷雾行为数值分析的基础研究”JSME 关西分会第 68 届年会论文集。

脇坂知行: "吸気2弁式機関における吸入混合気拡散過程の数値解析" 日本機械学会論文集(B編). 59. 966-973 (1993)

Tomoyuki Wakisaka：“双气门进气发动机中进气混合物扩散过程的数值分析”日本机械工程师学会会议记录（B 版）59. 966-973（1993 年）。

脇坂 知行: "吸気2弁式機関における吸入混合気拡散過程の数値解析" 第10回内燃機関合同シンポジウム講演論文集. 319-324 (1992)

Tomoyuki Wakisaka：“双气门进气发动机中进气混合物扩散过程的数值分析”第十届内燃机联合研讨会论文集319-324（1992）。

脇坂 知行: "燃料噴霧挙動の数値解析モデルの検討" 第11回内燃機関シンポジウム講演論文集. 241-246 (1993)

Tomoyuki Wakisaka：“燃油喷雾行为数值分析模型的研究”第11届内燃机研讨会论文集241-246（1993）。

Yoshihiro ISSHIKI: "Analysis of Acoustic Characteristics and Pressure Losses in Intake Silencers by Numerical Simulation" Tran.JSME, Ser.B. Vol.59, No.559. 996-1001 (1993)

Yoshihiro ISSHIKI：“通过数值模拟分析进气消音器的声学特性和压力损失”Tran.JSME，Ser.B。