Numerical simulation and experimental test of unsteady flow field for oscillating vanes gust generator in high-speed wind tunnel
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摘要: 为降低2.4 m大型连续式跨声速风洞阵风发生器的研发风险，以中国航空工业空气动力研究院0.6 m连续式跨声速风洞为依托，设计加工了一套摆动叶片式阵风发生器模型。以此为研究对象，采用自研ENSMB流场计算软件进行了非定常流场数值模拟并进行了试验验证，分析了摆动叶片式阵风发生器下游阵风速度场形成机理及分布特性，重点开展了叶片摆动频率和最大摆动幅值等参数对叶片下游阵风速度幅值影响规律研究。结果表明：计算结果与试验结果吻合较好，叶片下游的阵风速度场是由叶片尾涡引起的，且随时间呈周期性正弦规律变化，阵风速度幅值沿叶片展向分布不均，存在较大波动；阵风速度幅值先随叶片最大摆动幅值的增大而增大，在叶片最大摆动幅值为10°时达到最大，之后无明显变化，这可能是由于摆动幅度增大后叶片失速所致；叶片摆动频率的变化仅影响叶片下游阵风速度频率，对阵风速度幅值的影响不明显。
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关键词:
- 摆动叶片式阵风发生器 /
- 阵风速度场 /
- 摆动频率 /
- 最大摆动幅值 /
- 非定常
Abstract: Gust generator is the important equipment of the gust test system. In order to reduce the risk of development, a set of oscillating vanes gust generator suitable for 0.6 m continuous transonic wind tunnel was designed and processed. The self-developed ENSMB software was used to numerically simulate the unsteady flow field for the generator, and the formation mechanism and distribution characteristic of the disturbance velocity field downstream of the generator were analyzed. The research focused on the influence of the oscillating frequency and maximum oscillating amplitude of gust vanes on the gust velocity amplitude, and compared the results with the experimental data. The results show that the calculated results are in good agreement with that obtained by experiment. The gust velocity field downstream is caused by the vortex shedding from the vane, and changes periodically and sinusoidally with time. The gust velocity amplitude increases first with the increase of the maximum oscillating amplitude of gust vanes. When the maximum oscillating amplitude is 10°, the gust velocity amplitude reaches the maximum, and then there is no obvious change. This is probably due to the stall caused by the maximum oscillating amplitude increase. The frequency change only affects the frequency of the gust velocity, but has no obvious influence on the gust velocity amplitude. -
图 6 不同内迭代步下阵风速度特性对比
Figure 6. Comparison of gust velocity characteristics with different iteration steps
图 10 不同摆动频率和最大摆动幅值下的阵风速度特性曲线
Figure 10. Characteristics of gust field under different oscillating fre-quency and maximum oscillating amplitude
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