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基于格子玻尔兹曼方法的共轨系统压力波动抑制研究
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国家自然科学基金项目(51476150)


Research on Pressure Fluctuation Suppression of Common Rail System Based on Lattice Boltzmann Method
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    摘要:

    在高转速柴油机的高压共轨喷射系统中,前一次喷油所产生的水击压力波会对后一次喷油的精度产生较大影响。建立共轨管三维模型,以基于格子玻尔兹曼方法的计算流体力学仿真软件XFlow模拟共轨管内的压力波动,并总结了H型滤波器的关键参数对波动抑制效果的影响规律:随着滤波器容腔容积、小孔长度和小孔直径的逐渐增大,波动幅度均呈现先减小后增大的趋势,均存在最佳滤波尺寸,分别为6 283 mL、2 mm和3 mm,即滤波器存在最佳滤波尺寸组合,并根据电液相似理论分析了存在这种趋势的原因。最后在滤波器最佳滤波尺寸组合下验证了1.5、2.5、3.5 ms喷油脉宽下的滤波效果,其滤波衰减率分别达到60.3%、76.2%、63.8%,证明在一定范围的喷油脉宽内均有较好的滤波效果。

    Abstract:

    In the highpressure common rail injection system of highspeed diesel engines, the water pressure generated by the previous injection will have a greater impact on the accuracy of the subsequent injection. The threedimensional model of the common rail tube was established, and the computational fluid dynamics simulation software XFlow based on lattice Boltzmann method was used to simulate the pressure fluctuation in the common rail tube. The influence of the key parameters of the Helmholtz filter on the wave suppression effect was summarized. With the increase of the volume of the filter cavity, the length and diameter of the small hole, the fluctuation amplitude firstly decreases and then increases. There are optimal filtering sizes, which are 6.283 mL, 2 mm and 3 mm respectively. The filter has the best size combination, and the reason for this trend was analyzed according to the electrohydraulic similarity theory. Finally, the filtering effect of the 1.5, 2.5, and 3.5 ms injection pulse width was verified under the optimal filter size combination. The filter attenuation rate can reach 60.3%, 76.2%, and 63.8%, respectively. There is a good filtering effect in the fuel injection pulse width.

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桂文龙,续彦芳,刘汉涛,郑海.基于格子玻尔兹曼方法的共轨系统压力波动抑制研究[J].机床与液压,2021,49(6):104-107.
GUI Wenlong, XU Yanfang, LIU Hantao, ZHENG Hai. Research on Pressure Fluctuation Suppression of Common Rail System Based on Lattice Boltzmann Method[J]. Machine Tool & Hydraulics,2021,49(6):104-107

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  • 在线发布日期: 2022-03-24
  • 出版日期: 2021-03-28