Experimental device and method for measuring the relationship between nozzle internal flow and cavitation erosion under multiple working conditions

Abstract

The invention discloses a testing device and method for measuring the relationship between nozzle inside flow and cavitation erosion under multiple working conditions. The testing device comprises a pressure control system, a signal testing system, an injection system and a fuel supply system; the pressure control system comprises a first electromagnetic oil pressure control valve, a second electromagnetic oil pressure control valve, a pressure regulating valve, a pressure limiting valve and a back pressure cavity; the signal testing system comprises pressure sensors, flow sensors, a signal control terminal, a CCD high-speed digital camera and a computer; the injection system comprises oil atomizers and nozzle head caps; the fuel supply system comprises an oil tank, a heating tile, a fuel oil filter, an electric fuel pump, a high-pressure oil pump, a turbulator and a common-rail oil pipe. By means of the testing device, test research on influences on nozzle inside cavitation caused by nozzle inside cavitation flow generated by different injection pressures, back pressure, the fuel spray nozzle structure, the fuel temperature and the pipe inside flow state can be carried out, and measurement of influence factors of nozzle inside cavitation caused by nozzle inside cavitation flow of a diesel engine under multiple working conditions is achieved.

Description

Technical field [0001] The invention relates to the field of diesel fuel spraying, and particularly refers to a test device that can simultaneously explore the influence of injection pressure, nozzle outlet pressure, fuel temperature and pipe flow state on the internal flow and cavitation of diesel engine porous nozzles. Background technique [0002] Diesel engines have been deeply integrated into our lives since they were developed. Whether in the field of construction machinery or in other fields such as vehicles, ships, national defense, etc., there are a large number of applications, which play an important role in supporting the development of the national economy. In order to increase the injection pressure and obtain a better atomization effect, modern diesel engines widely use high-pressure common rail fuel injection technology. The injection pressure can reach 2000bar, the injection speed exceeds 300m / s, and the nozzle diameter is less than 0.1mm, making the injector noz...

AI Technical Summary

Problems solved by technology

At present, for diesel engine prototype multi-hole nozzles, based on the visualization of cavitation transient characteristics, starting from the quantitative relationship between cavitation structure, cavitation number, sound pressure and cavitation rate, the research on the mechanism of cavitation inside the nozzle has not yet been carried out.

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