Three-dimensional simulation method for working process of supercharged diesel engine

Abstract

The invention provides a three-dimensional simulation method for a working process of a supercharged diesel engine. The method is characterized in that on the basis of a three-dimensional simulation model of the process in a diesel engine cylinder, a three-dimensional model of a gas compressor and a turbine is added; in order to simulate transient work and response characteristics of a supercharger, an instantaneous angular acceleration is calculated through a force moment and a rotational inertia borne by a rotation part of the supercharger; and rotation speeds of a supercharger rotor at different moments are obtained through a time integral. According to the three-dimensional simulation method for the working process of the supercharged diesel engine, the three-dimensional model of three-dimensional model of is introduced, dynamic characteristics of each part of the supercharged diesel engine in the working process can be simulated really, the response of the supercharger can be detected and the matching characteristics of the diesel engine are beneficially disclosed.

Description

technical field [0001] The invention relates to the field of supercharged diesel engines, and relates to a design simulation technology of a supercharged diesel engine, in particular to a three-dimensional simulation method for a working process of a supercharged diesel engine. Background technique [0002] The working process of the supercharged diesel engine includes the rotating parts of the supercharger (including the compressor and the turbine) and the reciprocating parts of the diesel engine cylinder. These two parts involve two different working modes, and the matching problem has always been in the design process of the supercharged diesel engine. important research content. The current general method is to use one-dimensional unsteady flow simulation technology for the working process of the diesel engine cylinder, and use the supercharger characteristic curve derived from the test for the supercharger. The problem of this method is that the response of the turboch...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a three-dimensional simulation method for the working process of a supercharged diesel engine, to solve the problem that the existing simulation method for the working process of a supercharged diesel engine relies on a one-dimensional unsteady flow simulation method, depends on the steady-state characteristic curve of the supercharger, and ignores Supercharger rotor response problem, it is difficult to reveal the complex three-dimensional unsteady flow mechanism and matching characteristics between the rotating part of the supercharger and the reciprocating part of the cylinder piston

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