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工程力学  2014 

飞艇大攻角绕流气动特性模拟及湍流模型与参数影响研究

Keywords: 分离流动,飞艇,数值模拟,湍流模型,湍流强度

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Abstract:

飞艇大攻角绕流作为一种典型的分离与漩涡流动,相关研究具有较高难度和十分重要的意义。该文基于数值模拟方法,研究了飞艇大攻角绕流条件下的气动特性,分析了湍流模型选择和湍流强度设置等关键因素对模拟结果的影响。气动力、压力系数、流场显示细节等结果表明:SST模型和Realizable均能较准确地模拟飞艇周边流体流动现象,计算得到的气动参数和实验结果吻合良好,而S-A模型和实验存在较大差异;同时发现湍流强度对飞艇气动力存在较大影响,升阻力系数在湍流强度I>0.5%时随之线性增长。进一步引入了等效雷诺数的概念,证明与原始雷诺数类似,等效雷诺数对气动力影响存在相应的敏感区间,在计算和实验中值得加以注意。

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