摘要:
为了突破结冰风洞进行模型缩比试验时可能遇到的试验段尺寸和风洞模拟能力2方面的限制,本文从保证绕流流场相似、水滴运动和撞击特性相似以及结冰过程的热力学特性相似等角度出发,对影响飞机结冰过程的相似参数进行提炼,提出水滴运动及撞击过程中的水滴变形/分裂相似要求为韦伯数相似和水滴飞溅相似要求为撞击参数K相似这2个约束条件,综合已有常规结冰相似准则的研究,建立了一套考虑水滴动力学效应的结冰试验相似准则。并采用数值模拟的方法,对所提出的相似准则进行了验证,结果表明,该准则有效,可以应用于冰风洞试验,作为试验的理论指导和参数选取依据。
关键词:
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结冰 /
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冰风洞 /
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相似准则 /
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SLD /
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数值模拟
Abstract:
Constraints of the size and simulation ability are often encountered in the icing wind tunnel test.We established an icing scaling law with the dynamic effects of water droplets to solve the problem.It is based on the icing scaling laws with small size droplets.Similar parame-ters of ice accretion on aircraft surface were refined in this paper based on the similarity of a num-ber of conditions such as the flow field,droplet motion,impact properties and thermodynamic properties of ice accretion.Two constraint conditions are proposed to ensure the similarity of dy-namics effect of droplets.The first condition is the equal of Weber number,which ensures the similarity of droplet deformation.The second constraint is the equal of impact parameter,which ensures the similarity of droplet broken.The numerical method is used for the evaluation of the icing scaling law with the dynamic effects of water droplets.The results show that ice shapes on a full scale model and its sub-scaled model are similar,which illustrates that the law is effective and can be used in icing wind tunnel test.
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