| 引用本文: | 何秀华,朱学斌,杨嵩,邓志丹.无阀压电微泵用平面锥管内部流动附壁效应[J].哈尔滨工业大学学报,2015,47(7):92.DOI:10.11918/j.issn.0367-6234.2015.07.015 |
| HE Xiuhua,ZHU Xuebin,YANG Song,DENG Zhidan.Coanda effect of flat taper pipe applied in valveless piezoelectric micro pump[J].Journal of Harbin Institute of Technology,2015,47(7):92.DOI:10.11918/j.issn.0367-6234.2015.07.015 |
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| 摘要: |
| 为研究锥管内流体流动中产生的附壁效应对其流阻系数的影响,采用数值模拟的方法对平面锥管内部流动附壁效应进行研究．结果表明:雷诺数Re在300～3000,锥管角度在5～40°时,扩散方向流动可以分为3种状态,即稳定状态、附壁状态和射流状态．锥管角度为10～35°时,锥管内流动易于发生附壁效应．Re在300～1 200时,稳定状态扩散流阻系数随着扩散角的增大迅速降低;附壁状态扩散流阻系数随着扩散角的增大缓慢增大;射流状态扩散流阻系数随着扩散角的增大而缓慢降低．Re在1 800～3 000时,附壁状态扩散流阻系数在锥管角度为30°时达到最大值．流阻系数比在稳定状态和射流状态下基本不变,在附壁状态下随着扩散角的增大迅速减小． |
| 关键词: 平面锥管 附壁效应 流阻系数 射流状态 数值模拟 |
| DOI：10.11918/j.issn.0367-6234.2015.07.015 |
| 分类号:TH38 |
| 基金项目:国家自然科学基金(51276082); 江苏高校优势学科建设工程(苏政办发(2014)37号). |
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| Coanda effect of flat taper pipe applied in valveless piezoelectric micro pump |
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HE Xiuhua1, ZHU Xuebin1, YANG Song2, DENG Zhidan3
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(1. School of Energy and Power Engineering, Jiangsu University, 212013 Zhenjiang, Jiangsu,China; 2. Hydraulic Machine Center, Jiangsu University, 212013 Zhenjiang, Jiangsu, China; 3.Faculty of Science, Jiangsu University, 212013 Zhenjiang, Jiangsu,China)
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| Abstract: |
| The impact of Coanda effect on the flow resistance coefficient of flat-walled diffusers has been studied by numerical simulation, and the results show that when Reynolds number changes in the range of 300~3 000 and the diffusion angle θ of the cone tube varies from 5° to 40°, the fluid flow to the diffusion direction goes through three stages: the stable state, the wall-attachment state and the jet deflection state, when 10°<θ<35°, the Coanda effect can be obtained easily. When Reynolds number ranging from 300 to 1 200, with the increasing of diffusion angle, the flow resistance coefficient decreases rapidly during the stable state, increases slowly among the wall-attachment state and decreases gradually in time of the jet deflection state. While Re varies from 1 800 to 3 000, the flow resistance coefficient of the wall-attachment state reaches maximum at θ=30°. The flow resistance coefficient ratio in steady state and jet condition state is basically unchanged, but decreases quickly during the wall-attachment state with the increasing of diffusion angle. |
| Key words: flat-walled diffuser Coanda effect flow resistance coefficient jet deflection state numerical simulation |
