飞机空速校准用静压测量装置轮廓结构绕流影响分析

Analysis of Impact of Flow Around Caused by Profile of Static Pressure  Measurement Device for Aircraft Airspeed Calibration[HS)]

摘要:

介绍了针对一种面向飞机空速校准的外置式静压测量方法,为了减小测量装置轮廓结构绕流对静压测量的影响,从而提高静压测量精度,应用FLUENT对装置轮廓结构进行绕流影响分析,得到绕流影响最小的轮廓结构类型,并采用正交试验方法对收缩角度β、过渡长度L、最大直径ΦD、最小直径Φd共4个参数进行优化；仿真结果表明,测量装置轮廓采用圆弧型收缩过渡结构绕流影响最小,轮廓最大直径和过渡长度对静压测量绕流影响较为显著；最优参数组合为:β=33°,L=40 mm,ΦD=50 mm,Φd=22 mm,优化后的结构对静压管的绕流影响减小了37.5%,提高了静压测量精度。

Abstract:

Outboard static pressure measurement method was proposed for aircraft airspeed calibration. In order to reduce the impact of flow around caused by profile of the measurement device and to improve static pressure measurement accuracy, we analyze the impact of flow with commercial software package, FLUENT. From our analysis, the types of transitional structures with the minimum flow range are obtained. Then the structural geometric include contraction angle β, transition length L, maximum diameter ΦD, minimum diameter Φd are optimized based on the orthogonal test design method. It shows that the optimum structure shape is arc transition; the maximum diameter and transition length of the profile produce significant impact on air flow; the optimal combination of parameters is β=33°, L=40mm, ΦD=50mm, Φd=22mm. And by optimization, the structure has reduced the impact of flow around by 37.5% for the static pressure tube and greatly improved static pressure measurement accuracy.