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学者姓名：李福气
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Abstract ：
In this study, the flow behaviors and throttle effects of high-pressure air flow through orifices were experimentally investigated in a pipe system and numerically simulated using Reynolds-averaged Navier-Stokes equations with the shear stress transport (SST) k−ω turbulence model. Three orifice configurations with porosities (orifice hole area to pipe area ratio) of β = 28.4%, 7.1%, and 1.8% were comparatively evaluated under four different inflow pressures, i.e., pin = 1,2,3, and 4 bar. The numerical results agreed well with the corresponding experimental measurements. A primary recirculation with a smaller secondary recirculation region was formed immediately behind the trailing face. In the presence of supersonic flow, the streamwise velocity exhibited periodic oscillations, increasing at the expansion wave and decreasing at the shock wave region. The throttle effects were highly sensitive to the orifice porosities and the inflow conditions. In the β = 28.4% configuration, shock waves and expansion waves were evident under different inflow pressures and alternately dominated the downstream flow, leading to periodic streamwise temperature variations, with the minimum temperature reaching −160 °C at pin = 4 bar. For the orifice with β = 7.1%, the expansion and shock waves appeared at pin ≥ 2 bar, and continuously expanded with intensified flow fluctuations at pin = 3 and 4 bar, with the minimum temperature reaching −120 °C. For the orifice with β=1.8%, the impact of shock waves on the temperature field was barely observable under pin = 1 and 2 bar due to the small porosity. When pin ≥ 3 bar, similar temperature patterns with larger-porosity orifices were observed downstream of the orifice trailing face but were smaller in size. © 2024 Author(s).
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| GB/T 7714 | Li, F. , Shu, W. , Xu, Z. et al. Flow behaviors and throttle effects of high-pressure air flow through orifices [J]. | Physics of Fluids , 2024 , 36 (12) . |
| MLA | Li, F. et al. "Flow behaviors and throttle effects of high-pressure air flow through orifices" . | Physics of Fluids 36 . 12 (2024) . |
| APA | Li, F. , Shu, W. , Xu, Z. , Liu, B. , Zhang, J. , Hu, Z. et al. Flow behaviors and throttle effects of high-pressure air flow through orifices . | Physics of Fluids , 2024 , 36 (12) . |
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Abstract ：
In this study, the flow behaviors and throttle effects of high-pressure air flow through orifices were experimentally investigated in a pipe system and numerically simulated using Reynolds-averaged Navier-Stokes equations with the shear stress transport (SST) k-omega turbulence model. Three orifice configurations with porosities (orifice hole area to pipe area ratio) of beta = 28.4%, 7.1%, and 1.8% were comparatively evaluated under four different inflow pressures, i.e., p(in)= 1, 2, 3, and 4 bar. The numerical results agreed well with the corresponding experimental measurements. A primary recirculation with a smaller secondary recirculation region was formed immediately behind the trailing face. In the presence of supersonic flow, the streamwise velocity exhibited periodic oscillations, increasing at the expansion wave and decreasing at the shock wave region. The throttle effects were highly sensitive to the orifice porosities and the inflow conditions. In the beta = 28.4% configuration, shock waves and expansion waves were evident under different inflow pressures and alternately dominated the downstream flow, leading to periodic streamwise temperature variations, with the minimum temperature reaching -160 degrees C at p(in)= 4 bar. For the orifice with beta = 7.1%, the expansion and shock waves appeared at p(in)>= 2 bar, and continuously expanded with intensified flow fluctuations at p(in)= 3 and 4 bar, with the minimum temperature reaching -120 degrees C. For the orifice with beta = 1.8%, the impact of shock waves on the temperature field was barely observable under p(in)= 1 and 2 bar due to the small porosity. When p(in)>= 3 bar, similar temperature patterns with larger-porosity orifices were observed downstream of the orifice trailing face but were smaller in size.
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| GB/T 7714 | Li, Fuqi , Shu, Weilin , Xu, Zhaoyang et al. Flow behaviors and throttle effects of high-pressure air flow through orifices [J]. | PHYSICS OF FLUIDS , 2024 , 36 (12) . |
| MLA | Li, Fuqi et al. "Flow behaviors and throttle effects of high-pressure air flow through orifices" . | PHYSICS OF FLUIDS 36 . 12 (2024) . |
| APA | Li, Fuqi , Shu, Weilin , Xu, Zhaoyang , Liu, Bang , Zhang, Ji , Hu, Zhiqiang et al. Flow behaviors and throttle effects of high-pressure air flow through orifices . | PHYSICS OF FLUIDS , 2024 , 36 (12) . |
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Abstract ：
压力脉动主动抑制是提升数字液压阀控系统控制精度和可靠性的关键技术.然而,目前主动抑制方法在对压力脉动进行抑制时缺乏对其特性的深入理解,导致抑制效果不理想.因此,设计了压力脉动测试试验台,分析了系统中不同位置压力脉动的变化情况,探索了液压泵、高速开关阀对不同位置压力脉动的影响.结果表明:数字液压阀控系统中压力脉动的主要来自于高速开关阀持续开/关引起的水击现象,并且压力脉动的频率始终与阀的开/关频率保持一致.为设计前馈的压力脉动主动抑制系统提供了新思路,同时也为研发更高效的压力脉动衰减器提供了参考.
Keyword ：
压力脉动 压力脉动 数字液压 数字液压 试验分析 试验分析 高速开关阀 高速开关阀
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| GB/T 7714 | 陈福龙 , 杜恒 , 李雨铮 et al. 数字液压阀控系统中压力脉动试验 [J]. | 液压与气动 , 2024 , 48 (10) : 136-142 . |
| MLA | 陈福龙 et al. "数字液压阀控系统中压力脉动试验" . | 液压与气动 48 . 10 (2024) : 136-142 . |
| APA | 陈福龙 , 杜恒 , 李雨铮 , 周时钊 , 李福气 , 马玉山 . 数字液压阀控系统中压力脉动试验 . | 液压与气动 , 2024 , 48 (10) , 136-142 . |
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