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上翘收缩型模型后体绕流特征与阻力相关性分析
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Abstract:
运输机类模型后体通常具有上翘、收缩的外形特点，这种后体与传统平直型后体绕流之间存在显著差异，而目前国内对上翘收缩型后体绕流的研究主要集中于优化减阻方面，对该类后体流动特性、尾腔压力分布以及支架干扰影响认识较少，给风洞试验方案设计、模型阻力特性分析带来较大的困难。本文采用数值模拟与试验测试相结合的方法，研究上翘收缩型后体模型绕流特点，分析支架机构对模型尾腔压力的远场干扰影响，并基于数值计算结果分析了上翘角和收缩比对运输机后体绕流特性的影响，提出了一种基于后体底部压力的阻力相关性分析方法。
The rear body of transport aircraft models usually has the appearance characteristics of upwarping and shrinking, which is significantly different from the flow around traditional flat rear bodies. Currently, research on the flow around upwarping and shrinking rear bodies in China mainly focuses on optimizing drag reduction. There is little understanding of the flow characteristics, tail chamber pressure distribution, and support interference of this type of rear body, which brings significant difficulties to the design of wind tunnel test schemes and the analysis of model resistance characteristics. This article adopts a combination of numerical simulation and experimental testing to study the flow characteristics of an upwarped and contracted rear body model, analyze the far-field interference effect of the support mechanism on the model’s tail cavity pressure, and based on the numerical calculation results, analyze the influence of upwarping angle and contraction ratio on the flow characteristics of a transport aircraft’s rear body. A resistance correlation analysis method based on the bottom pressure of the rear body is proposed.
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