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Aerothermodynamic analyses and redesign of GHIBLI Plasma Wind Tunnel hypersonic diffuser

机译：Ghibli等离子风洞超声波漫射器的空气热力学分析与重新设计

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This article deals with the aerothermodynamic analyses of the hypersonic diffuser of GHIBLI Plasma Wind Tunnel at CIRA (Centro Italiano Ricerche Aerospaziali). This diffuser presented an unexpected behavior not ensuring nozzle under-expanded flow in test chamber, even in several free jet conditions. This experimental evidence was investigated following two approaches. First, a literature review pointed out that the design rules, generally recommended in supersonic diffusers design, were not observed in the case of GHIBLI diffuser. Second, a simplified numerical model was introduced and validated with experimental results, performing Computational Fluid Dynamics analyses of GHIBLI diffuser. Finally, in order to enhance the pressure recovery and to obtain the desired under-expanded conditions, two new candidate designs compliant with the literature recommended values have been proposed and analyzed via CFD. (C) 2019 Elsevier Masson SAS. All rights reserved.
机译：本文涉及CiRA（Centro Italiano Ricerche Aerospaziali）的Ghibli等离子风洞的高超声速扩散器的空气运动分析。这种扩散器呈现出意外行为，即使在几种自由喷射条件下，也不会确保喷嘴膨胀的流动。在两种方法后调查了这种实验证据。首先，在Ghibli扩散器的情况下，未观察到文献综述指出，通常在超音速扩散器设计中推荐的设计规则。其次，用实验结果引入并验证了简化的数值模型，执行Ghibli扩散器的计算流体动力学分析。最后，为了增强压力恢复并获得所需的未扩展条件，已经提出了通过CFD提出并分析了符合文献推荐值的两种新的候选设计。 （c）2019年Elsevier Masson SAS。版权所有。

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