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Hypersonic Blunt-Body Flows in Hydrogen-Neon Mixtures

机译:氢-氖混合物中的高超音速钝体流动

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The use of hydrogen-neon gas mixtures for experimental simulation of hypersonic ionizing blunt-body flows in hydrogen-helium atmospheres is considered. An existing approximate theory of blunt-body similarity is employed, and it is found that the ionizing relaxation of hydrogen can be accommodated in that theory if the effect of ionization along streamlines is correlated by a binary reaction variable involving the hydrogen partial pressure. The correlation is identical for helium and neon and is not influenced by the fraction of diluent. Thus blunt-body flows of hydrogen-helium mixtures can be simulated with hydrogen-neon mixtures of a different diluent fraction. The simulation is demonstrated by using experiments with a 60% hydrogen-40% neon mixture in a free piston nonreflected shock tunnel to obtain the shock shape on a hemispherically blunted cone entering the atmosphere of Uranus or Neptune.
机译:考虑使用氢氖气体混合物在氢氦气氛中进行高超声速电离钝体流的实验模拟。使用现有的钝体相似性近似理论,并且发现,如果沿流线的电离作用与涉及氢分压的二元反应变量相关,则可以在该理论中容纳氢的电离弛豫。氦和氖的相关性相同,不受稀释剂比例的影响。因此,可以用不同稀释分数的氢氖混合物模拟氢氦混合物的钝体流动。通过在自由活塞非反射式冲击隧道中使用60%氢-40%氖气混合物进行实验,以模拟进入天王星或海王星大气的半球形钝锥上的冲击形状,来证明该模拟。

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