针环网式电流体动力气泵流量特性的系统研究,Physics of Fluids

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针环网式电流体动力气泵流量特性的系统研究
Physics of Fluids ( IF 4.1 ) Pub Date : 2023-03-20 , DOI: 10.1063/5.0140445
Ru-Xian Cai ₁ , Wen Chen ₂ , Fan Zhang ₁ , Wei-Cheng Yan _{1,

2}

Affiliation

在这项研究中，进行了二维数值模拟，以研究由带有针环网电极的电流体动力 (EHD) 泵引起的气流特性。高压电极采用针状电极和环形电极，接地采用网状电极。对电场分布、空间电荷分布和流场分布行为进行了详细的仿真分析。仿真结果与实验测量数据吻合较好。系统研究了关键参数（包括施加电压、电极配置和通道直径）对 EHD 泵的流动特性和能效的影响。结果表明，最明显的电场强度位于针尖周围和环形电极边缘区域，而没有明显证据表明环形电极附近有更多的空间电荷。网孔处的气流速度高于中心圆孔处的气流速度。泵的流速和能量转换效率随外加电压单调增加。在设计 EHD 泵以实现最大效率时，应考虑端环距离、环内径和泵通道尺寸的综合影响。结果还表明，可以实现 4.26% 的最佳能量转换效率，高于大多数其他 EHD 泵 (0.11–2.56%)。

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A systematic investigation on flow characteristics of needle-ring-net electrohydrodynamic gas pump

In this study, a two-dimensional numerical simulation is conducted to investigate the characteristics of gas flow induced by an electrohydrodynamic (EHD) pump with needle-ring-net electrodes. A needle electrode and a ring electrode are used as the high-voltage electrode, and a net electrode is used as the grounding one. The electric field distribution, space charge distribution, and flow field distribution behaviors were simulated and analyzed in detail. The simulation results were in good agreement with the experimentally measured data. The influence of key parameters, including applied voltage, electrode configurations, and channel diameter, on the flow characteristics and energy efficiency of an EHD pump was studied systematically. The results showed that the most pronounced electric field strength locates at the region around the needle tip and the edge of the ring electrode, while there is no obvious evidence showing more space charge located at the vicinity of the ring electrode. The airflow velocity at the net pores is higher than that at the central circular hole. Flow velocity and energy conversion efficiency of the pump monotonically increase with applied voltage. A combinational effect of tip-ring distance, ring inner diameter, and pump channel size should be considered to design the EHD pump to achieve maximum efficiency. The results also showed that an optimal energy conversion efficiency of 4.26% can be achieved, which is higher than most of the other EHD pumps (0.11–2.56%). The proposed model can serve as an efficient tool for the design and optimization of the needle-ring-net EHD gas pumps.

更新日期：2023-03-20

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