| 煤液化调节阀湍流特性及稳定性研究 |
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| 引用本文： | 李贝贝,张雨佳,刘秀梅,彭佳佳,赵巧.煤液化调节阀湍流特性及稳定性研究[J].液压与气动,2023,0(2):135-145. |
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| 作者姓名： | 李贝贝 张雨佳 刘秀梅 彭佳佳 赵巧 |
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| 作者单位： | 1.中国矿业大学机电工程学院, 江苏徐州 221116;2.中国矿业大学大学生创新训练中心, 江苏徐州 221116 |
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| 摘 要： | 针对湍流流动对煤液化调节阀内部流场稳定性影响，基于粒子图像测速技术(Particle Image Velocimetry, PIV)和能量梯度理论对煤液化调节阀的脉动流场信息进行测量和表征。采用数值模拟和实验相结合的方法，探究了1.2,1.4,1.6,1.8 MPa 4种进口压力条件下(出口压力固定为1 MPa、开度固定为60%)脉动速度均方根、湍流动能等湍流特性参数的变化规律，并结合能量梯度理论对调节阀内流动稳定性展开分析。结果表明，脉动速度均方根的分布与湍流动能的分布具有相似性，高速主流区域位于阀芯头部低速流体的交界处，脉动速度均方根及湍动能值随流速增大而升高，并在轴向位置x为29.73 mm处达到峰值；高速主流与周围低速流体自身剪切产生的速度梯度是造成流场失稳的主要因素；整个流场最不稳定的位置分布在节流口下方阀芯和阀座壁面位置以及高速主流核心区外的剪切层内，进一步揭示了煤液化调节阀失稳机理。
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| 关 键 词： | 湍动能 能量梯度 PIV粒子图像测速 调节阀 |
| 收稿时间： | 2022-07-23 |
Study on Turbulent Characteristics and Stability of Coal Liquefaction Regulating Valve |
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| LI Bei-bei,ZHANG Yu-jia,LIU Xiu-mei,PENG Jia-jia,ZHAO Qiao.Study on Turbulent Characteristics and Stability of Coal Liquefaction Regulating Valve[J].Chinese Hydraulics & Pneumatics,2023,0(2):135-145. |
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| Authors: | LI Bei-bei ZHANG Yu-jia LIU Xiu-mei PENG Jia-jia ZHAO Qiao |
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| Affiliation: | 1. School of Mechanical and Electrical Engineering, China University of Mining and Technology , Xuzhou, Jiangsu 221116;2. College Students Innovation Training Center, China University of Mining and Technology, Xuzhou, Jiangsu 221116 |
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| Abstract: | For the influence of turbulent flow on the stability of internal flow field of coal liquefaction regulating valve, the pulsating flow field information of coal liquefaction regulating valve is measured and characterized based on particle image velocimetry (PIV) and energy gradient theory. Using the method of numerical simulation and experiment, the variation laws of turbulent characteristic parameters such as the root mean square of pulsating velocity and turbulent kinetic energy under four inlet pressure conditions of 1.2,1.4,1.6,1.8 MPa (the outlet pressure is fixed at 1 MPa and the opening is fixed at 60%) are explored, and the flow stability in the regulating valve is analyzed in combination with the energy gradient theory. The results show that the distribution of the root mean square of the pulsating velocity is similar to that of the turbulent kinetic energy. The high-speed mainstream area is located at the junction of the low-speed fluid at the head of the valve core, the root mean square of the pulsating velocity and the turbulent kinetic energy increase with the increase of the velocity, and reach the peak at the axial position x is 29.73 mm. The velocity gradient generated by the shear of the high-speed mainstream and the surrounding low-speed fluid itself is the main factor causing the instability of the flow field. The most unstable positions of the whole flow field are distributed in the valve core and valve seat wall below the throttle and in the shear layer outside the core area of the high-speed mainstream, which further reveals the instability mechanism of the coal liquefaction regulating valve. |
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| Keywords: | turbulent kinetic energy energy gradient PIV particle image velocimetry regulating valve |
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