平板前掠翼发散风洞试验预测技术

介绍了平板前掠翼的发散试验技术。采用了Southwell方法进行发散动压预测,该方法是一种亚临界发散试验技术。通过试验,也介绍了预测试验和临界试验中的一些关键技术。试验采用了三个平板前掠翼模型,其中两个为复合材料层合平板,一个为铝合金平板。为了对亚临界试验结果进行预测和验证,在试验前进行了发散动压的计算并补充进行了临界发散风洞试验。计算结果和临界试验结果均表明,利用Southwell方法进行发散动压的预测能够取得较好的结果。模型发散动压的计算是利用NASTRAN的柔度法和自行开发程序的模态法进行的,两种方法均采用亚音速偶极子格网法气动力理论的定常部分进行气动力的计算。通过对计算结果、预测试验结果和临界试验结果的对比分析,可以看出三者具有较好的一致性。

DIVERGENCE EXPERIMENT PREDICTION TECHNIQUES OF FLAT-PLATE FORWARD-SWEPT WING IN WIND TUNNEL

The divergence experiment prediction techniques of flat plate forward swept wings are presented. The Southwell method, a subcritical divergence experiment technique, was used for prediction of divergence dynamic pressure. By testing, some key techniques in the prediction experiment and critical experiment are introduced.In this experiment, three flat plate forward swept wings were tested, of which two are composite flat plate wings and one is an aluminum flat plate wing. In order to predict and validate the result of the subcritical experiment, the divergence dynamic pressures were calculated before experiment and the critical divergence wind tunnel experiments are used. Both the calculating results and testing results indicate that better results can be attained by using the Southwell method. The divergence pressures of these models were calculated by the flexibility method of MSC/NASTRAN and the mode method developed by the authors, while the steady aerodynamics of the subsonic Doublet Lattice method is used for aerodynamic calculation in both the methods. By making a comparison between the results of calculation, prediction experiment and critical experiment, it can be seen that all the three methods can make better results.