翼型弦长和方位角对垂直轴水动力转轮启动性能的影响

doi:10.3969/j.issn.1671-7775.2022.05.009

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摘要针对H型水动力转轮启动力矩小、启动时间长的问题，运用计算流体动力学方法进行了模拟与分析.采用6DOF模拟转轮转速随作用力矩的变化过程，对转轮在不同初始角度条件下启动时的瞬态流场、角速度与输出力矩进行了对比与关联分析.结果表明，直叶片垂直轴水动力转轮启动过程中，角速度与输出力矩的变化之间无显式相关性.在最小静力矩条件下启动时，转轮到达角速度和力矩峰值所需的时间较在最大静力矩条件下启动时间长.到达最大转轮旋转角速度时，各叶片内侧存在较大低压区，这一点不受启动角度变化的影响.当叶片包围区域内低速区面积大时，转轮的输出力矩较小.在最大静力矩条件下启动时，尾流区的完整性较强.在不同翼型弦长条件下，角速度经历了上升、下降、再到平稳振荡的过程.随着翼型弦长自0.16 m增大至0.24 m，转轮启动时间增加0.63 s，转轮旋转达到稳定后的平均角速度变小，但角速度波动幅度基本不变.

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	康灿
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关键词 ： H型水动力转轮, 启动性能, 初始角度, 输出力矩, 瞬态流场, 启动时间

Abstract： To solve the problems of small startup moment and long startup time of the Htype hydrokinetic rotor, the simulation and analysis were conducted by the computational fluid dynamics method. The six degree of freedom (6DOF) method was adopted to model the variation of rotational speed of rotor with the torques acting on rotor. Comparison and correlation analysis were conducted among transient flows, rotational speed and output torque at different initial setting angles. The results show that there is no explicit correlation between rotational speed and output torque during the startup process of the vertical shaft hydrodynamic rotor with straight blade. As the rotor starts up at the minimum static torque, the time required to reach the maximum rotational speed and output torque is longer than that associated with the maximum static torque. As the maximum rotational speed is attained, low-pressure zones are produced in the area enclosed by the blades, which is insensitive to the initial setting angle. Large area of lowpressure zones is responsible for low output torque. As the rotor starts up at the maximum static torque, the integrity of the wake flow is relatively high. The rotational speed experiences increasing, decreasing and subsequent regular oscillation, which is common at different chord lengths of the airfoil. As the chord length is increased from 0.16 m to 0.24 m, the startup time is extended by 0.63 s, and the average rotational speed is decreased for the stabilized rotation, but the fluctuation amplitudes remain nearly invariant.

Key words： H-type hydrokinetic rotor startup performance initial setting angle output torque transient flow field startup time

收稿日期: 2022-03-09

基金资助: 国家重点研发计划项目(2021YFC2801600)

作者简介: 康灿（1978—），男，河北宁晋人，教授，博士生导师(kangcan@ujs.edu.cn)，主要从事流体机械及工程中复杂流动研究. 汪志远（1998—），男，安徽金寨人，硕士研究生（2212006026@stmail.ujs.edu.cn），主要从事垂直轴升力型水力转轮启动过程及性能优化研究.

引用本文:

康灿，汪志远，叶卫明，丁可金. 翼型弦长和方位角对垂直轴水动力转轮启动性能的影响[J]. 江苏大学学报（自然科学版）, 2022, 43(5): 554-561. KANG Can, WANG Zhiyuan, YE Weiming, DING Kejin. Effects of chord length of hydrofoil and azimuth angle on startup performance of vertical-axis hydrokinetic rotor[J]. Journal of Jiangsu University(Natural Science Eidtion) , 2022, 43(5): 554-561.

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http://zzs.ujs.edu.cn/xbzkb/CN/ 10.3969/j.issn.1671-7775.2022.05.009 或 http://zzs.ujs.edu.cn/xbzkb/CN/Y2022/V43/I5/554

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