CFD-based in-cylinder direct injection gasoline engine fuel injector spraying characteristic calibration method

Abstract

The invention discloses a CFD-based in-cylinder direct injection gasoline engine fuel injector spray characteristic calibration method, which comprises the following steps: through a constant volume bomb spray test experiment, acquiring the spray characteristic of a fuel injector and actual parameter experiment data corresponding to related form parameters; establishing a constant volume bomb three-dimensional model through CFD analysis software, and performing grid division on the constant volume bomb model; aiming at different spraying working conditions, inputting working condition parameters in the constant volume bomb grid model; and substituting into a constant volume bomb grid model for simulation calculation, and comparing the spray information of the oil sprayer to calibrate the spray characteristic of the oil sprayer. A set of comparison data is obtained through a constant volume bomb experiment, a constant volume bomb grid model is achieved through CFD software, working condition parameters are input to simulate the actual environment, analogue simulation is conducted under the grid model, a set of data information capable of truly simulating the actual spraying process is rapidly found out through comparison experiment data, and the research cost is reduced.

Description

technical field [0001] The invention relates to the technical field of a method for calibrating spray characteristics of a fuel injector, in particular to a method for calibrating spray characteristics of an in-cylinder direct injection gasoline engine fuel injector based on CFD. Background technique [0002] CFD numerical simulation analysis technology can simulate ideal and complex experimental process, and the analysis cost is low. [0003] The traditional automobile bench experiment method has great limitations in analyzing the process of in-cylinder spray and mixture formation, in-cylinder combustion process, and gas flow, and the research and development cycle is long and the cost is high, which is not conducive to understanding the gasoline engine spray process. SUMMARY OF THE INVENTION [0004] Therefore, the technical problem to be solved by the present invention is to overcome the limitations of the traditional vehicle bench test method in the prior art, reduce t...

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Problems solved by technology

[0003] The traditional automobile bench test method to analyze the engine cylinder spray and mixture formation process, cylinder combustion process, gas flow, etc. has great limitations, and the development cycle is long and the cost is high, which is not conducive to understanding the gasoline engine spray process.

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