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

A technology of internal flow and test equipment, applied in the direction of measuring equipment, fuel injection equipment, engine testing, etc., can solve problems that have not yet been developed, and achieve the effects of accelerating nozzle cavitation, improving fuel physical properties, and rapid cavitation

Active Publication Date: 2018-12-14
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

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Embodiment Construction

[0041] The invention will be further described in detail below in conjunction with the drawings.

[0042] The invention relates to a test device that can measure the internal flow and cavitation relationship of a porous nozzle of a diesel engine under multiple operating conditions. figure 1 As shown in the figure, P represents the pressure transmission unit, V represents the flow transmission unit, and the thick solid line represents the oil circuit. The test device includes a pressure control system, a signal test system, an injection system and a fuel supply system.

[0043] The pressure control system includes a first electromagnetic oil pressure control valve, a second electromagnetic oil pressure control valve, a pressure regulating valve, a pressure limiting valve, a first back pressure chamber with a pressure control device, and a second back pressure chamber with a pressure control device body. The system controls the injection pressure of the oil circuit behind it by cont...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M65/00
CPCF02M65/00
Inventor 何志霞张鑫王谦钟汶君郭根苗
Owner JIANGSU UNIV
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