Spray oil beam converter and testing system and method

Abstract

The invention provides a spray mist oil beam converter. The spray mist oil beam converter comprises a first pipe section and a second pipe section which are connected. The first pipe section sleeves anozzle of an oil sprayer. One side of the second pipe section contracts in the radial direction with respect to the first pipe section and is provided with a distribution hole corresponding to a to-be-tested spray hole of the oil sprayer. The diameter of the distribution hole is equal to or greater than the diameter of the spray hole of the oil sprayer. An oil discharging hole is formed in the second pipe section. An oil mist spraying space for other spray hole except the to-be-tested spray hole is formed in the second pipe section. Furthermore, the oil discharging hole is located in the other side, backing onto the distribution hole, of the second pipe section. The invention further provides a spray mist test system. The spray mist test system comprises the spray mist oil beam converter,the oil sprayer, a constant-volume container, an oil spraying system, a main controller, a demisting device, an optical test system, an air supply system, a data acquisition system and an upper computer. According to the spray mist oil beam converter and the spray mist test system, the disturbance of other spray mist oil beams on a to-be-tested spray mist oil beam can be eliminated, and synchronous control of the oil spraying system, the demisting device and the optical test system is achieved.

Description

technical field [0001] The invention belongs to the technical field of internal combustion engine testing, in particular to the technical field of testing the spray characteristics of each nozzle hole of a multi-hole fuel injector. Background technique [0002] Fuel spray characteristics are one of the important factors affecting engine combustion and emission performance. The test of spray characteristics is of great significance to the design and development of engine combustion system. The understanding of the transient and spatial characteristics of diesel injection is crucial to further improve the injection system and combustion, but there are great difficulties in obtaining data. [0003] In the detection of jet characteristics, many scholars have also carried out related research. The test device described in the "Chinese Patent Application of CN104847557 A" has relatively large limitations. Although it claims to be able to realize the spray detection of porous inje...

AI Technical Summary

Problems solved by technology

Due to the difference in processing error, structure and hydraulic conditions of each injection hole, there will be differences in spray characteristics between each injection hole, which will cause uneven distribution of fuel in the combustion chamber, which will lead to deterioration of engine performance and combustion emissions.

The size of the nozzle head is as small as 3mm, and the distance between each nozzle hole is about 1mm. The test of spray particle size and concentration is limited by laser equipment, which makes it difficult to measure the characteristics of the sprayed oil beam of each nozzle hole.

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