UNSTEADY AERODYNAMIC WORK ON OSCILLATING ANNULAR CASCADES IN COUNTER ROTATION
UNSTEADY AERODYNAMIC WORK ON OSCILLATING ANNULAR CASCADES IN COUNTER ROTATION
复制标题
反向旋转振荡环形叶栅的不稳定空气动力学工作
DOI：
10.1007/1-4020-4605-7_14
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
K. Nanba
中科院分区：
文献类型：
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作者：
M. Namba;K. Nanba
本文研究了相邻叶片排对叶片振动引起的非定常气动力和叶栅叶片颤振特性的影响。为此，编制了基于非定常升力面理论的对转环形叶栅非定常叶片载荷计算程序。给出了不同组合叶栅的非定常气动功的数值算例，即亚音速-亚音速、超音速、亚音速-超音速叶栅。结果表明，当相邻叶栅为超音速时，解耦叶栅与气动耦合叶栅的振动叶片上的非定常气动功相差较大。编制了求解对转环形叶栅弯扭耦合颤振方程的计算程序。文中给出了颤振分析的一些结果。当主声导管模式处于开启状态时，相邻叶片排的存在会使亚音速叶栅的颤振临界流体速度发生显著变化。
AbstractThe paper studies the effect of neighboring blade rows on unsteady aerodynamic force due to blade vibration and on flutter characteristics of cascading blades. For this purpose the computation program to calculate the unsteady blade loading based on the unsteady lifting surface theory for contra-rotating annular cascades was formulated and coded. Numerical examples of unsteady aerodynamic works for various combinations of cascades, i.e., subsonic-subsonic, supersonicsupersonic, and subsonic-supersonic cascades, are presented. It is clearly shown that the difference in the unsteady aerodynamic work on vibrating blades between the case of the decoupled cascade and the case of the aerodynamically coupled cascades is large when the neighbor cascade is supersonic. A computation program to solve the coupled bending-torsion flutter equation for the contra-rotating annular cascades was also developed. Some results of the flutter analysis are presented. The presence of the neighboring blade row gives rise to significant change in the critical flutter fluid velocity for the subsonic cascade when the main acoustic duct mode is of cut-on state.