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Viscous equilibrium analysis of heat transfer on blunted cone at hypersonic flow

机译：高超声速流下钝锥传热的粘滞平衡分析

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摘要

High speed flow requires consideration of some complex phenomena such as chemical reactions. In fact, as flow velocity increase, high temperature of hypersonic velocity excites molecules to react and causes dissociation and ionization. Accurate analysis of existing schemes by considering appropriate models and equations is crucial for investigation of hypersonic flow with chemical reactions. The main objective of this investigation is to study the aerodynamic characteristics of hypersonic flow undergoes equilibrium chemical reaction by means of commercial computational fluid dynamic CFD code. Although current available software contains air species exist at high temperature, lacks adequate thermodynamics and transport relations which should be consider for equilibrium flow such as compressibility factor and equilibrium constant. Therefore, an external code is needed to calculate all thermodynamics and transport properties of dissociated air in equilibrium condition at various temperature and pressure accurately. Numerical computations achieved for both laminar and turbulent flow at two different angles of attack around blunted cone. Both perfect gas and equilibrium air results are presented and compared with available experimental data. Good agreement between equilibrium results and the experimental data confirming the capability of the present scheme for predicting the behavior of air in chemical equilibrium especially the heat transfer on the surface and perfect gas limitation.
机译：高速流动需要考虑一些复杂的现象，例如化学反应。实际上，随着流速的增加，高超声速的高温会激发分子发生反应并引起离解和电离。通过考虑适当的模型和方程式对现有方案进行准确的分析对于研究具有化学反应的超音速流至关重要。这项研究的主要目的是通过商业计算流体动力学CFD代码研究高超声速流经过平衡化学反应的空气动力学特性。尽管当前可用的软件包含在高温下存在的空气物种，但缺乏足够的热力学和传输关系，应考虑平衡流，例如可压缩系数和平衡常数。因此，需要一个外部代码来精确计算在各种温度和压力下处于平衡条件下的离解空气的所有热力学和传输特性。钝锥周围两个不同迎角的层流和湍流的数值计算。给出了理想气体和平衡空气的结果，并与可用的实验数据进行了比较。平衡结果与实验数据之间的良好一致性，证实了本方案预测空气在化学平衡下的行为的能力，尤其是表面上的传热和完美的气体限制。

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