Transonic Similarity Theory Applied to a Supercritical Airfoil in Heavy Gas
Transonic Similarity Theory Applied to a Supercritical Airfoil in Heavy Gas
复制标题
跨音速相似理论应用于重气体超临界翼型
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
A. Murthy
中科院分区：
文献类型：
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作者：
J. Anders;W. Anderson;A. Murthy
本文对使用高分子量试验气体来增加跨音速风洞的雷诺数范围进行了实验研究。本文介绍了重气体操作的跨音速风洞的改进，并讨论了重气体（六氟化硫）实例的真实气体特性。在相同的滞止条件和试验段马赫数下，六氟化硫使试验雷诺数增加2倍以上。本文给出了在六氟化硫和氮气中，马赫数为0.7和0.72时先进超临界翼型上的压力分布的实验和计算结果。跨音速相似理论在将重气体结果转换为等效氮气（空气）结果方面是成功的，只要使用正确的γ定义，粘性效应不占主导地位
The use of a high-molecular-weight test gas to increase the Reynolds number range of transonic wind tunnels is explored experimentally. Modifications to a transonic wind tunnel for heavy-gas operation are described, and the real-gas properties of the example heavy gas (sulfur hexafluoride) are discussed. Sulfur hexafluoride is shown to increase the test Reynolds number by a factor of more than 2 over air at the same stagnation conditions and test section Mach number. Experimental and computational pressure distributions on an advanced supercritical airfoil at Mach numbers of 0.7 and 0.72 in both sulfur hexafluoride and nitrogen are presented. Transonic similarity theory is shown to be successful in transforming the heavy-gas results to equivalent nitrogen (air) results, provided the correct definition of gamma is used and viscous effects are not dominant