结冰风洞实验中的相似理论

相似性是风洞实验的一项基本要求，结冰风洞实验也不例外。为了系统性地研究结冰风洞实验中的相似性问题，首先，通过对飞行结冰问题进行分析和总结，找出了其中涉及的各种变量，并分析了其物理意义和量纲。其次，采用相似理论分析方法对结冰问题进行分析，得到了若干无量纲参数，并分析了这些无量纲参数的意义。再次，通过忽略一些不重要的影响因素，减少无量纲参数，并对飞行结冰中涉及的影响因素进行了合理地简化，最终得出了结冰实验的相似准则。最后，结合结冰风洞的运行参数，按照相似准则的要求得到了缩比模型结冰实验运行参数选取方法，并采用CFD方法进行了验证。结果表明:得到的缩比模型结冰实验运行参数选取方法是可行的。 

Similarity theory in icing wind tunnel test

Similarity is the basic requirements of all kinds of wind tunnel tests including icing wind tunnel tests. To systematically study the similarity problem of icing wind tunnel test, the in-flight icing problem is analyzed and summed up, and then the variables involved are summarized, including both their physical meanings and dimensions. Then some dimensionless variables are obtained by applying the similarity theory analysis method to the in-flight icing problem and the physical meanings of the dimensionless variables are analyzed. Some simplifications to the dimensionless variables of the in-flight icing problem are conducted by ignoring the unimportant factors, and then the dominant similarity parameters of icing wind tunnel tests are obtained. Finally, the method of selecting the operating parameters of the icing wind tunnel test on scale models is achieved by applying the similarity laws, it is verified by CFD and its feasibility is confirmed.