A fuel injector for diesel engine and its method for realizing premixed combustion

Abstract

The invention relates to a method for achieving pre-mixing burning through cavitation jet strengthening, and belongs to the field of diesel engines. According to the technical scheme, (1) a spraying nozzle structure of a diesel engine is improved, the internal surface roughness of the spraying nozzle is increased, and the cavitation intensity of jet in the spraying nozzle is increased; (2) vortex flow in a pressure chamber of an oil atomizer is improved, and the flowing intensity of the turbulent flow in a spraying hole is strengthened so as to increase the jet cavitation intensity; (3) an electronic control unit sends out a command to control the oil jetting amount of an oil jetting pump according to signals, such as the rotating speed and the pressure fed back by the working condition of the diesel engine, the jet gas liquid two-phase mixing ratio is controlled through the oil spraying nozzle, and the jetting cavitation is strengthened; and (4) the jetting cavitation is strengthened through the method, the better atomization effect on jet oil in the spraying nozzle is achieved, and the requirement for pre-mixing burning of the diesel engine is met. According to the method, a pure fluid oil pocket jetting manner of a traditional spraying nozzle is changed, and the gas-liquid two-phase oil pocket jetting manner is achieved; and through the structure improvement of the spraying nozzle, the jetting cavitation of the diesel engine can be strengthened under any working condition, and the oil pocket atomization quality is improved.

Description

technical field [0001] The present invention relates to the technical field of a fuel injector for a diesel engine, and focuses on a method for a diesel engine to realize premixed combustion by means of cavitation jet enhancement, specifically a method for realizing electronic control through signal feedback such as speed and pressure according to different working conditions of a diesel engine. The component adjusts the fuel injection quantity of the injector. In the case of changes in the fuel injection quantity and fuel injection pressure, the cavitation of the jet flow is enhanced through the improvement of the nozzle structure, so that the sprayed oil beam can improve the atomization quality of diesel oil in the combustion chamber of the diesel engine to meet the requirements of Different working conditions of the diesel engine improve the power and fuel economy of the diesel engine. Background technique [0002] The fuel injector is an important component of the fuel i...

AI Technical Summary

Problems solved by technology

However, these studies still have some adverse effects when increasing the atomization effect, such as the clogging of the fuel injection hole, so some other methods are used to control the atomization effect and reduce the adverse effects

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