| 低速风洞阵风发生器实验研究与分析 |
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| 引用本文： | 屈晓力,刘琴,朱博,聂旭涛,王超.低速风洞阵风发生器实验研究与分析[J].实验流体力学,2021,35(5):99-105. |
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| 作者姓名： | 屈晓力 刘琴 朱博 聂旭涛 王超 |
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| 作者单位： | 1.中国空气动力研究与发展中心 空气动力学国家重点实验室，四川 绵阳 621000 |
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| 摘 要： | 阵风发生器是阵风响应风洞试验的关键设备。针对叶片式阵风发生器的运行特点，通过简化的定常涡升理论，推导出阵风发生器下游流场Y向风速的计算公式。以0.55 m×0.4 m低速风洞（声学引导风洞）为实验平台，系统地研究了阵风发生器的设计参数（叶片弦长、数目、间距）和运行参数（叶片摆幅和摆动频率、来流速度）对阵风流场风速极值的影响。研究表明:推导的简化公式能够解释阵风发生器各设计和运行参数变化后，其下游流场Y向风速的变化机制，可在阵风发生器设计时对其产生的阵风流场进行简单预估；从增大阵风发生器下游流场Y向速度极值的角度出发，增加叶片数目比增大叶片弦长更能增大Y向速度；在叶片失速前，增大叶片摆幅比增大叶片摆动频率更能增大Y向速度；采用多组叶片的阵风发生器，叶片间距不能太小，否则会导致等效升力系数下降，当叶片间距为1.2倍弦长时，能够获得最大的Y向速度极值。本文研究工作可为其他风洞的阵风发生器设计提供参考。
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| 关 键 词： | 低速风洞 阵风响应 叶片式 发生器 实验研究 |
| 收稿时间： | 2020-10-12 |
Experimental research and analysis of gust generator for low speed wind tunnel |
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| Affiliation: | 1.State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China2.Facility Design and Instrumentation Institute, China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China |
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| Abstract: | The gust generator is the key equipment for the wind tunnel test in response to the gust. According to the operating characteristics of the oscillating vanes gust generator, a simplified steady vortex theory is used to deduce the calculation formula of the Y-direction wind speed in the downstream flow field of the gust generator. With the experimental researches done in the 0.55 m × 0.4 m low-speed wind tunnel (a pilot acoustic wind tunnel), the influences on the extreme wind speed of the gust flow field were systematically studied by changing the design parameters of the gust generator (vane chord length, number, spacing) and operating parameters (vane swing amplitude, swing frequency, incoming flow velocity). The research shows that the simplified formula derived in this paper can explain the changing mechanism of the Y-direction wind speed in the downstream flow field after the design and operating parameters of the gust generator are changed. The gust flow field generated by the gust generator can be simply analyzed during the design of the gust generator. To increase the Y-speed extreme value of the downstream flow field of the gust generator, increasing the number of vanes has an advantage over increasing the vanes chord length. Before the vanes stall, the larger Y-speed extreme value can be obtained by increasing the vanes swing speed rather than by increasing the vanes swing frequency. The spacing of the vanes for the gust generator should not be too small, otherwise the equivalent lift coefficient of the vanes would decrease. When the vanes spacing is 1.2 times the chord length, the maximum Y-direction wind speed can be obtained. This research can provide reference for the design of gust generators in other wind tunnels. |
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