2.4m跨声速风洞壁板参数对核心流均匀性的影响

Wall parameters influence on centerline flow uniformity in 2.4m transonic wind tunnel

跨声速风洞试验段壁板参数多,影响规律复杂,获得壁板参数对流场均匀性的影响规律是提高设备调试质量与效率的关键途径。基于2.4m跨声速风洞多期流场校测试验情况,以马赫数分布标准偏差为指标,汇总分析了大型跨声速风洞试验段壁板结构参数对核心流均匀性的影响规律。结果表明,核心流均匀性对试验段入口处加速区壁板开孔率特别敏感,除保证开孔率分布连续外,还应避免加速区气流的过膨胀效应。在风洞运行范围内,引射缝均发挥降低堵塞干扰的作用。

Wall parameters influence on transonic flow field is complicated due to various parameters of transonic wind tun- nel test section walls. One key to improve transonic equipment calibration quality and efficiency is to acquire the effect mechanism of wall parameters of wind tunnel test section on flow field uniformity. Based on 2.4 m transonic wind tunnel multi flow field calibration experiments, wall configuration parameters effect on centerline flow uniformity of large transonic wind tunnel test section is summarized and investigated by Mach number distribution standard deviation. Research results show that the centerline flow uniformity is sensitive to porosity ratio of acceleration region, which should be distributed continuously along flow direction. The overexpansion flow should be avoided in acceleration region in order to minimize the wave strength. The ejector-slot is capable of reducing blockage interference over the entire operating range.