多次喷射下压力波动对喷嘴内流及近场喷雾影响试验研究

doi:10.19562/j.chinasae.qcgc.2023.05.013

Abstract

Abstract:

To study the causal relationship between the multi-frequency pressure fluctuations and the characteristics of the internal flow of nozzle， as well as the influence mechanism on the near-field spray， the high-speed microscopic imaging technology is used to carry out visualization experimental study on the real-size tapered hole nozzles during the multiple injection process under different common rail pressures. At the same time， the high-pressure sensor is used to measure the pressure fluctuation data of the nozzle inlet. The research results show that the spray cone angle shows a boot-shaped trend in the main injection process， which consists of the development period， the transformation period， the stable period and the decay period. The overall trend is affected by the injection pressure， and there is a change of cavitation form in the process. In the process of small fuel injection such as pre-injection and post-injection， there are obvious inconsistencies caused by the fluctuation of the needle valve lift. The pressure drop at the nozzle is positively correlated with the level of cycle fuel injection quantity， and the cavitation characteristics affect the frequency characteristics and propagation speed of the pressure fluctuation. When the geometrically induced cavitation forms， the pressure fluctuates at a low frequency.Whenline cavitation forms， a high frequency pressure fluctuation trend occurs.

Key words: real-size tapered hole nozzle, near-field spray dynamics, pressure fluctuations, multiple injections, flow cavitation characteristics

Yunpeng Wei,Liyun Fan,Hanwen Zhang,Bo Li,Yuanqi Gu,Xianyin Leng. Experimental Research on Influence of Pressure Fluctuation on Nozzle Flow and Near Field Spray Under Multiple Injections[J].Automotive Engineering, 2023, 45(5): 836-844.

Figures/Tables 11

References 25

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Experimental Research on Influence of Pressure Fluctuation on Nozzle Flow and Near Field Spray Under Multiple Injections

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