Calibration method and system for engine spray simulation

Abstract

The invention relates to an engine spray simulation calibration method and system. The engine spray simulation calibration method comprises the following steps that a current oil beam actual drop point coordinate is obtained according to spray oil beam simulation model and a relevant parameter of a preset injector; the relevant parameter of the preset injector comprises a current input oil beam drop point coordinate; a drop point error of this round is obtained according to a target oil beam design drop point coordinate and the current oil beam actual drop point coordinate; when the drop pointerror of this round is not in a preset error range, the sum of drop point errors of all previous rounds, the drop point error of this round and the target oil beam design drop point coordinate is obtained, and the input oil beam drop point coordinate used for calibrating the next round is obtained; and when the drop point error is not in the preset error range, the oil beam actual drop point coordinate corresponding to the drop point error in the preset error range is obtained, and completion of engine spray simulation calibration is conformed.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a calibration method and system for engine spray simulation. Background technique [0002] Fuel atomization in engines uses pressure nozzles to break fuel into discrete droplets at high velocity from the fuel injection holes into the ambient gas. The engine spray simulation can obtain the mixture distribution of fuel and air in the cylinder, so as to judge the quality of fuel atomization. [0003] In the process of realization, the inventors found that due to the high speed of fuel spraying from the fuel injection hole, which can reach 100 meters per second, there is a pressure difference around the fuel jet. figure 1 is the traditional engine oil beam distribution map, such as figure 1 As shown, the pressure difference between the inner and outer sides of the oil beam will change the actual trajectory of the oil beam, which will eventually lead to an error between the actual o...

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide a calibration method and system for engine spray simulation in view of the large error between the design target value and the actual drop point value of the oil jet

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