【摘要】 跨声速风洞模型区核心流马赫数分布特性是评价风洞流场性能品质的重要指标,通常采用长轴向探测管进行测量。为了模拟无干扰的来流特性,一般长轴向探测管都会从支架段延伸至风洞收缩段,因此通常都具有较长的尺寸、较多的静压测点以及较小的堵塞度要求。为了更精确地测量跨声速风洞模型区核心流马赫数分布,设计了相对于长轴向探测管堵塞度更小、尺寸更短的静压探针。在风洞流场判稳的基础上,由移测机构带动静压探针移测试验段模型区核心流的马赫数分布,通过风洞试验对其测值特性开展了相关研究。试验结果表明,当Ma≤0.95时,静压探针采用移测方式获得的核心流马赫数分布总体规律及量值与长轴向探测管测量结果基本相当,但是静压探针在部分流场细节上与长轴向探测管存在差异,主要表现为:静压探针马赫数测量波动更小,精度更高,均匀性指标更好。更多还原

【Abstract】 The axial Mach number distribution of the core flow for model in a transonic wind tunnel is an important index to evaluate the performance of the flow field, which is usually measured by the centerline probe. In order to simulate the incoming flow characteristics without interference, the probe will extend from the support section to the shrinkage section, so the probe usually must has longer inches, more static pressure measuring points and smaller blockage requirements. In order to study the influence of the points of the centerline probe on the uniformity distribution of flow field, a new static pressure probe is designed, which is smaller and shorter than the centerline probe. On the basis of the stability of the flow field, the Mach number distribution of the flow field measured by the static pressure probe which is driven by the moving measuring mechanism. The characteristics of the measured values are studied by wind tunnel test. The results show that: when Ma≤0.95,the overall distribution and value of Mach number obtained by the static pressure probe is basically the same as those obtained by the centerline probe, but some flow field details, which mainly shows that Mach number of the static pressure probe has smaller fluctuation, higher accuracy and better uniformity index.更多还原