降落伞风洞试验中的几个主要问题

初步总结分析了我国低速风洞降落伞试验中的主要问题,并提出了具体解决办法。得到:开伞动态试验洞壁干扰影响可忽略不计:“无限质量”条件下风洞试验不能准确确定某些伞型的最大拉直力:伞稳态试验的洞壁干扰不能用常规或Maskell方法修正,用壁压信息法可得到准确的修正结果;应用不同测力方法测量时所得稳态结果差异较大;在水平风洞中进行稳态试验须导向定位以消除偏角等结论。此外,对伞的稳定性与横向载荷测量提出了具体实施方案。

SOME MAIN PROBLEMS ON PARACHUTE WIND TUNNEL TEST

A preliminary summary and analysis of the main problems arising from the parachute test in the low speed wind tunnel is presented in the paper, and the methods for solving these problems are also given. It has been demonstrated that the wall interference could not be neglected for the dynamic load measurement of parachute during its openning, the condition of " indefinit mass" is not suitable for wind tunnel testing for determining the maximum pulling straight force during the parachute openning, the conventional and E. C. Maskell correction method of wall interference are not suitable for the static load mesurements while the wall signature method can provide accurate correction, the results obtained from different techniques may have great differences, and for the static load measurements of parachute in horizontal configurated wind tunnel a guide equipment is needed to eliminate the angle deviation. A detailed technique for measuring the stability and lateral loads of parachute is recommended in the paper.