压缩冲程

预测压缩冲程期间气缸中气体运动的方法

A Method for Predicting in-Cylinder Gas Motion During the Compression Stroke

本文提出了一种新的内燃机理想循环&具有部分等温压缩冲程的内燃机工作过程。

A new ICE working cycle with a partial isothermal compression stroke is advanced .

然后在压缩冲程即将结束时，柴油燃料被喷射或被喷雾进入气缸。

Then diesel fuel oil is injected or sprayed into the cylinder at the end of the compression stroke .

一些发动机的飞轮上面也会做上标记，以此来显示气缸的系列号并得知哪里会发生压缩冲程。

The flywheels of some engines also carry marks indicating the serial numbers of the cylinders where the compression occurs .

同时，球塞副在压缩冲程中，由于偏心力的作用，球塞偏向缸孔一侧，对缸孔壁的侧向压力较大。

Meanwhile , in the process of compression , ball piston will move to one side of cylinder due to eccentric force and poses great lateral pressure on the surface of cylinder .

缸内平均湍动能强度在进气冲程中总体呈先增大后减小的趋势，压缩冲程中耗散作用使湍动能降低，但挤流作用使气缸中部的湍动能升高；

During the compression stroke the turbulence kinetic energy decreases due to the dissipation effect , while the turbulence kinetic energy in the center of the cylinder increases as a result of the squish effect .

活塞临界位置与在压缩冲程后期活塞上行、缸内滚流开始畸变、破碎的活塞位置相当。

This critical piston position of crank angle should correspond to the time when the in-cylinder tumble has to be distorted and destroyed by the upward moving piston during the late stage of the compression stroke .

本文主要对直喷式汽油机在压缩冲程和膨胀冲程中的燃烧进行模拟，分析了喷油前、喷油中、喷油后压力、温度及流场的整个变化过程。

This paper focuses on the direct injection gasoline during the compression stroke and expansion stroke , analyzes the change process of pressure , temperature and flow field during the fuel injection period , before and after fuel injection .