Developmental Research on Computer Aided Analysis and Design of an Engine Combustion System

发动机燃烧系统计算机辅助分析与设计的进展研究

• 批准号: 61850037
• 负责人: HIROYASU Hiroyuki
• 金额: $ 4.8万
• 依托单位: HIROSHIMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-61850037/
• 关键词: Computer Aided Design; CAD; Internal Combustion Engine; Combustion; Simulation; 最適化

A quantitative analysis of fuel vapor concentration in a fuel sprayh was made for obtaining fundamental knowledge of mixture formation which was necessary for the development of a sumulation program of diesel engine combustion. For this purpose, the technique for processing the spray image taken by the schlieren and shadow photography was developed, and applied to the axisymmetric spray in a high-pressure and high-temperature atmosphere. Internal structure of the spray distorted in a cross air flow was analyuzed by combining this image processing technique with the program for the computed tomographic transformation. Several informations obtained through these analysed were incorporated into the simulation program of the diesel engine combustion, which was composed of an air flow sub-program, and a mixture formation and combustion sub-program. The air flow sub-program was created for mainly predicting the swirling air flow during a compression stroke, especially at fuel injection timin … More g. Taking the computational cost and accuracy of into consideration, a two-zone model was adopted, and the angular velocities of the swirling air flow in the zones inside and outside the piston cavity radius were computed. The principle consideration of the mixture formation and combustion sub-program was to find the injection and combustion chamber parameters matching with the swirling air flow, and to predict the over-swirl phenomenon. The comubustion chamber was mapped with non-uniform rectangular soulid cells in cylindrical coordinates. The conservation equations for fuel vapor concentration, combustion product concentration and gas enthalpy were discretized in a finite difference technique. By numerically solving these conservation equations, the spatial distributions of fuel vapor concentration, combustion product concentration and gas temperature were obtained. The comparison between the computed result, and the angular velocity measured with the laser doppler velocimeter and fthe flame behavior observed in a high-speed combustion movie, demonstrates the potential of this simulation program. Less

本文对燃油喷雾中的燃油蒸气浓度进行了定量分析，以获得柴油机燃烧模拟程序开发所需的混合气形成的基础知识。为此，发展了纹影摄影和阴影摄影的喷雾图像处理技术，并将其应用于高温高压大气中的轴对称喷雾。将该图像处理技术与计算机层析变换程序相结合，分析了喷雾在横向气流中变形的内部结构。通过这些分析获得的一些信息被纳入柴油机燃烧模拟程序，该程序由空气流动子程序和混合气形成和燃烧子程序组成。空气流动子程序主要用于预测压缩冲程中，特别是喷油时刻的空气旋流。 ...更多信息 G.考虑到计算量和计算精度，采用两区模型，计算了活塞腔半径内外区域的旋转气流角速度。混合气形成和燃烧子程序的主要考虑是找到与旋流相匹配的喷射和燃烧室参数，并预测过旋流现象。在圆柱坐标系中，用非均匀的矩形soulid细胞映射了comumu室。采用有限差分法离散燃料蒸汽浓度、燃烧产物浓度和气体焓的守恒方程。通过数值求解这些守恒方程，得到了燃料蒸气浓度、燃烧产物浓度和燃气温度的空间分布。计算结果与激光多普勒测速仪测得的角速度和高速燃烧影片中观察到的火焰行为进行了比较，证明了该模拟程序的潜力。少

项目成果

西田恵哉: 日本機械学会論文集(B編). 54-497. 203-210 (1988)

Keiya Nishida：日本机械工程师学会会议录（B 版）54-497（1988 年）。

A.Murakami: SAE Paper. NO.880385. 1-20 (1988)

A.Murakami：SAE 论文。

K.Nishida: Twenty-Second Symposium(International)on Combustion. (1989)

K.Nishida：第二十二届燃烧研讨会（国际）。

Nishida,Keiya: "Measurements of Fuel Vapor Concentration in a Diesel Spray by Image Analysis of a Reconstructed Hologram (2nd Report, Results at High-Temperature and High-Pressure Atmosphere)" Transactions of the Japan Society of Mechanical Engineers (B).

Nishida,Keiya：“通过重建全息图的图像分析测量柴油喷雾中的燃油蒸气浓度（第二次报告，高温高压气氛下的结果）”日本机械工程师学会会刊（B）。

Nishida,keiya: "Combined Schlieren and Computed Tomographic Technique for Analyzing Fuel Jet and Vaporizaing Spray" Twenty-Second Symposium (International) on Combustion. (1989)

Nishida,keiya：“结合纹影和计算机断层扫描技术来分析燃料喷射和汽化喷雾”第二十二届燃烧研讨会（国际）。