曲面样条插值法在飞机测压试验中的应用

摘要

Lots of wing pressure distribution data at different angles of attack and flap deflection are involved in the process of aircraft load designing, but the data from the pressure tests is generally limited. How to select an appro-priate interpolation method for calculating the pressure distributing became especially important. In order to get the wing pressure distribution of an arbitrary attitude between two group angles of attack and flap deflection, which pressure distribution were constructed to two curved surface functions, and the interpolation method of curved sur-face coefficient was imported. According to the similarity comparing analysis between the interpolation and experi-ment results, it is known that the similitude coefficient between the interpolation value and experiment value is higher and has a good agreement with test data.%飞机载荷设计中会涉及求解大量不同攻角和襟翼偏度的机翼气动压力分布，而风洞测压试验所测得的压力分布是有限的，如何选择一种合适的插值算法求出载荷设计中所需攻角和偏度的压力分布，是飞机气动载荷设计中的重要环节。采用样条曲面系数插值法，通过构造机翼压力分布的样条曲面函数，得到两种攻角和偏度情况下的压力曲面，进而插值出在两种攻角和偏度之间的任意一种攻角和偏度的压力曲面。将插值得到的压力数值和试验数据进行相似性对比分析发现：插值和试验值的相似系数较高与试验数据吻合度好。