直喷式柴油机缸内涡流、挤流和湍流的数值研究  

A Numerical Study on Swirl, Squish and Turbulence in Cylinders of Direct Injection Diesel Engines

作　　者：解茂昭[1] 

机构地区：[1]大连理工大学动力工程系

出　　处：《大连理工大学学报》1990年第1期93-100,共8页Journal of Dalian University of Technology

摘　　要：用二维数值分析方法研究直喷式柴油机燃烧室内气流运动的规律，着重研究压缩 行程期间缸内涡流、挤流和湍流的演变规律及三者之间的相互作用。计算基于任意拉 格朗日－欧拉法．采用ｋ－ε双方程湍流模型。对两个典型燃烧室的计算表明：无涡流 时，接近上死点时缸内流场主要受挤流控制；随着挤压面积的增大，挤流．涡流和湍 流都同时增强；涡流会使流场大大复杂化，而且随涡流的强弱不同，燃烧室内形成不 同的流动图案；初始涡流是缸内湍流生成的重要因素，挤流对此也有一定贡献。Air motion in cylinders of D. I. diesel engines is studied by two- diminsional numerical analyses with emphasis on the evo]ution of swirl, squish and turbulence in the cylinder and the interactions among them. The computations are based on the Arbitrary Lagrangian-Eulerian method and employ the k-ε turbulence model. Computational results for two typical combustion chambers show that the in-cylinder flow field near TDC is governed mainly by squish in the case without swirl which complicates the flow field significantly. Different flow patterns in the chamber will be produced depending on the swirl intensity. The initial swirl plays an important role in generating turbulence in the cylinder, herein squish also- makes some contributions.

关 键 词：柴油机 直喷式 流场 湍流 数值模拟 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]