Comparative investigation and test verification of cavitation and turbulence models of injector control ball valve

IF 2.6 3区工程技术 Q2 ENGINEERING, MECHANICAL International Journal of Heat and Fluid Flow Pub Date : 2024-09-04 DOI:10.1016/j.ijheatfluidflow.2024.109557

Ping Chen, Zhenming Liu, Rongwu Xu, Jingbin Liu

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Abstract

The higher the injection pressure, the more serious the cavitation phenomenon of the injector control ball valve, which seriously affects the emission and reliability of the diesel engine. The selection of turbulence and cavitation models is the key to study the above-mentioned cavitation problems using numerical methods. Based on the Winklhofer micro-channel fuel test, four turbulence models and two cavitation models with strong representation are used to construct a micro-channel model, and the simulation results are compared with the test results. The combination of the LES and ZGB model is more accurate for the calculation of mass flow at the outlet and the cavitation distribution of the micro-channel. The combination of the SST k-ω and the SS model is more accurate for the calculation of flow rate at the micro-channel cross-section and the pressure gradient inside the micro-channel. The combination of LES and ZGB model is more suitable for numerical simulation of control ball valve. The numerical simulation of the control ball valve is carried out by using combination of LES and ZGB model, and the visualization test of the actual size injector control ball valve is verified, with good consistency. The conclusions of the study provide guidance for the simulation analysis and design of injector control ball valve.

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喷油器控制球阀气蚀和湍流模型的比较研究与试验验证

喷油压力越高，喷油器控制球阀的穴蚀现象越严重，严重影响柴油机的排放和可靠性。湍流和气穴模型的选择是利用数值方法研究上述气穴问题的关键。基于 Winklhofer 微通道燃料试验，采用四种湍流模型和两种代表性较强的气蚀模型构建微通道模型，并将仿真结果与试验结果进行对比。LES 和 ZGB 模型的组合对于计算微通道出口处的质量流量和空化分布更为精确。SST k-ω 和 SS 模型的组合对于计算微通道截面处的流速和微通道内的压力梯度更为精确。LES 和 ZGB 模型的组合更适合控制球阀的数值模拟。利用 LES 和 ZGB 模型的组合对控制球阀进行了数值模拟，并对实际尺寸的喷射器控制球阀进行了可视化试验验证，结果一致性良好。研究结论为喷油器控制球阀的仿真分析和设计提供了指导。

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来源期刊

International Journal of Heat and Fluid Flow 工程技术-工程：机械

CiteScore

5.00

自引率

7.70%

发文量

131

审稿时长

33 days

期刊介绍： The International Journal of Heat and Fluid Flow welcomes high-quality original contributions on experimental, computational, and physical aspects of convective heat transfer and fluid dynamics relevant to engineering or the environment, including multiphase and microscale flows. Papers reporting the application of these disciplines to design and development, with emphasis on new technological fields, are also welcomed. Some of these new fields include microscale electronic and mechanical systems; medical and biological systems; and thermal and flow control in both the internal and external environment.