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Prandtl-Meyer膨胀波中凝结的初步研究

发表时间:2013-02-15  浏览量:1359  下载量:527
全部作者: 曹峗,罗喜胜
作者单位: 中国科学技术大学物理学院
摘 要: 通过流场显示的方法,观察不同来流湿度下,后台阶流所形成的膨胀波中,凝结对流场结构的影响。经研究发现:随着来流湿度的增加,凝结区域中会产生一道由弱到强的凝结激波(condensation shock wave, CS)。当湿度过大时,又会在上游产生一道正激波,反而抑制了下游的凝结。同时,通过数值模拟与实验研究进行比较验证,结果基本一致。数值模拟还发现:一定来流条件下,凝结流场出现自激振荡现象。
关 键 词: 流体力学;Prandtl-Meyer膨胀波;凝结;自激振荡
Title: Study on condensation in Prandtl-Meyer expansion wave
Author: CAO Yun, LUO Xisheng
Organization: School of Physical Sciences, University of Science and Technology of China
Abstract: In this paper, the effects of condensation on flow structure was studied in a case of backward-facing step flow using the flow visualization method. Experimental results showed that a diabatic shock wave due to the latent heat occurred in the expansion fan. The condensation shock was strengthening with the humidity of the oncoming flow increasing. When the saturation ratio reached to a certain value, a normal shock wave appeared upstream of the sharp edge, which in turn inhibited the condensation downstream. Meanwhile, numerical simulation was carried out for comparing with experiments. The numerical simulation results showed the same phenomena as that observed in experiments. Numerical simulation also showed that a self-excited oscillation of diabatic shock wave occurred under certain flow conditions.
Key words: fluid mechanics; Prandtl-Meyer expansion wave; condensation; self-excited oscillation
发表期数: 2013年2月第3期
引用格式: 曹峗,罗喜胜. Prandtl-Meyer膨胀波中凝结的初步研究[J]. 中国科技论文在线精品论文,2013,6(3):273-278.
 
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