工程科学学报2016，Vol.38Issue(8)：1175-1181,7.DOI:10.13374/j.issn2095-9389.2016.08.018
外掠百叶板流场自持振荡数值模拟研究
Numerical simulation of self-sustained oscillations in flow past a louver
摘要
Abstract
Flow past louvers is common in engineering applications. Self-sustained oscillations caused by the flow configuration lead to periodical pressure fluctuations. Because of that, periodic loads will be applied on circumambient structures continuously and may give rise to fatigue problems. Using a numerical simulation method, self-sustained oscillations caused by flow past a louver are studied in this paper. The numerical results show that when the Mach number is small, the self-sustained oscillations belong to a pure fluid dynamic problem. This phenomenon is induced by generation and propagation of large-scale vortices which are generated from fluctuations of the shear layer. In addition, pressure oscillations generated by this phenomenon contain two significant features: sus-tainability and periodicity. The frequency of the self-sustained oscillations is spatially uniform. Along the mainstream direction, the amplitude of the self-sustained oscillations sharply increases first and then stabilizes. At the impingement edge, it slightly decreases. With an increasing size of the cavity inside the louver, the variation of the frequency basically remains stable. On the other hand, the amplitude increases gradually and remains stable when the cavity size reaches a critical value.关键词
流场/百叶板/振荡/涡团/数值模拟Key words
flow fields/louvers/oscillations/vortices/numerical simulation分类
数理科学引用本文复制引用
张永昌,徐宇工,陈向东,朱一妃..外掠百叶板流场自持振荡数值模拟研究[J].工程科学学报,2016,38(8):1175-1181,7.基金项目
国家自然科学基金资助项目(51475036) （51475036）
国家高技术研究发展计划资助项目(2011AA11A103) （2011AA11A103）
