外掠百叶板流场自持振荡数值模拟研究
发布时间：2018-11-24 08:05
【摘要】：外掠百叶板流动在工程中十分常见,由其引发的流场自持振荡现象能够导致流场压力持续波动,使周围结构承受持续作用的周期载荷,造成结构疲劳安全隐患.采用数值模拟方法,针对外掠百叶板流场自持振荡问题进行研究.计算结果表明:低马赫数条件下,外掠百叶板流场中产生的自持振荡现象属于纯流体动力学问题,其形成原因为流场剪切层振荡所引发的大尺度涡团的形成与迁移.同时,随之产生的压力振荡具有持续性及周期性.自持振荡频率是空间均匀的,而幅值在主流方向上呈先急剧增大后稳定,最后小幅减小的趋势.随着百叶板内侧的空腔体积不断增大,振荡频率变化较小,振荡幅值逐渐增大并在空腔体积达到一定值后保持稳定.
[Abstract]:The flow of outer swept louver plate is very common in engineering. The phenomenon of self-sustaining oscillation of flow field caused by it can cause continuous fluctuation of flow field pressure, make the surrounding structure bear the periodic load of continuous action, and cause structural fatigue safety hidden trouble. A numerical simulation method is used to study the self-sustaining oscillation of the flow field in a swept louver plate. The results show that the self-sustained oscillation in the flow field of swept louver plate is a pure hydrodynamic problem under the condition of low Mach number, and the reason is the formation and migration of large scale vortex mass caused by shear layer oscillation in the flow field. At the same time, the resulting pressure oscillations are persistent and periodic. The frequency of self-sustaining oscillation is uniform in space, while the amplitude increases sharply and then stabilizes in the mainstream direction, and then decreases slightly. With the increasing of the cavity volume inside the louver plate, the oscillation frequency changes little, and the oscillation amplitude increases gradually and remains stable when the cavity volume reaches a certain value.
【作者单位】： 北京交通大学机械与电子控制工程学院;
【基金】：国家自然科学基金资助项目(51475036) 国家高技术研究发展计划资助项目(2011AA11A103)
【分类号】：O35
本文编号：2352908
[Abstract]:The flow of outer swept louver plate is very common in engineering. The phenomenon of self-sustaining oscillation of flow field caused by it can cause continuous fluctuation of flow field pressure, make the surrounding structure bear the periodic load of continuous action, and cause structural fatigue safety hidden trouble. A numerical simulation method is used to study the self-sustaining oscillation of the flow field in a swept louver plate. The results show that the self-sustained oscillation in the flow field of swept louver plate is a pure hydrodynamic problem under the condition of low Mach number, and the reason is the formation and migration of large scale vortex mass caused by shear layer oscillation in the flow field. At the same time, the resulting pressure oscillations are persistent and periodic. The frequency of self-sustaining oscillation is uniform in space, while the amplitude increases sharply and then stabilizes in the mainstream direction, and then decreases slightly. With the increasing of the cavity volume inside the louver plate, the oscillation frequency changes little, and the oscillation amplitude increases gradually and remains stable when the cavity volume reaches a certain value.
【作者单位】： 北京交通大学机械与电子控制工程学院;
【基金】：国家自然科学基金资助项目(51475036) 国家高技术研究发展计划资助项目(2011AA11A103)
【分类号】：O35
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