How to calculate the compression ratio of a diesel engine?

What is the compression ratio of a diesel engine? No matter whether the equipment is equipped with a gasoline engine or a diesel engine, a stable and proper compression ratio can ensure the smooth and stable operation of the diesel engine. Generally, the compression ratio of a diesel engine cannot be changed, because the combustion chamber volume and the cylinder working volume are fixed parameters that have been determined in the design.

 

Compression ratio (generally represented by ε) is a very important parameter in diesel engines. The compression ratio indicates the degree of compression of the gas in the cylinder, which is the ratio of the volume of the gas before compression to the volume of the gas after compression, that is, the ratio of the total volume of the cylinder to the volume of the combustion chamber.

 

ε=Va/Vc=(Vh+Vc)/Vc=1+Vh/Vc

 

In the formula, Va is the total volume of the cylinder; Vh is the working volume of the cylinder; Vc is the volume of the combustion chamber.

 

The higher the compression ratio of the diesel engine, the higher the thermal efficiency, but the greater the burst pressure of the diesel engine parts, the higher the size and strength requirements of the diesel engine parts, which may make the relevant parts of the diesel engine very difficult. Heavy. Therefore, the compression ratio of the diesel engine cannot be very large.