A rapid cavitation test device and test method for porous nozzles of diesel engines

Abstract

The invention discloses a fast cavitation erosion test device and a test method for a diesel engine multi-hole nozzle. The fast cavitation erosion test device comprises a fuel supplying system, an ejecting system and a backpressure system. The fuel supplying system comprises an oil tank, a fuel filter, a high-pressure oil pump and a common rail pipe which are connected in sequence. The ejecting system comprises an oil atomizer and an aluminum magnesium alloy nozzle head cap. The backpressure system comprises a constant volume bomb, a third pressure gauge, a reducing valve and a nitrogen cylinder which are connected in sequence. The common rail pipe is connected with the oil tank through a first oil returning pipeline, and the constant volume bomb is connected with the oil tank through a second oil returning pipeline. According to the test device and the test method for the diesel engine multi-hole nozzle, the nozzle cavitation erosion can be accelerated within short time, the effect of the cavitation erosion ratio on the later spraying is studied, and therefore guidance can be provided for reasonably designing a nozzle geometric structure, selecting appropriate metal materials, improving the fuel physical property and selecting the appropriate fuel temperature, and the theoretical guidance is provided for comprehensively taking the hole atomizing into consideration, preventing the cavitation erosion and optimizing a nozzle structure.

Description

technical field [0001] The invention relates to the field of diesel engine fuel spray, which can be used for the test and research of the internal cavitation characteristics of diesel engine nozzles, in particular to a test device for the research of the internal cavitation characteristics of diesel engine prototype nozzles with back pressure. Background technique [0002] Since the research and development of diesel engine, it has been deeply integrated into our life. Whether in the field of construction machinery or in other fields such as vehicles, ships, and national defense, there are a large number of applications, which play an important supporting role in the development of the national economy. The development of modern diesel engines is directly related to the increase of fuel injection pressure. The electronically controlled high-pressure common rail fuel injection system can completely separate the generation of fuel injection pressure from the injection process....

AI Technical Summary

Problems solved by technology

At present, no experimental research has been carried out on the cavitation damage characteristics of real porous nozzles of diesel engines under certain back pressure conditions in the laboratory

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