摘要
对影响颤振稳定性关键参数进行研究,并探讨颤振稳定性随关键参数的变化规律,对颤振问题的研究具有重要意义。在进一步完善非定常雷诺平均N-S方程求解程序的基础上,基于影响系数法,在不同振型下就出口马赫数对三维涡轮振荡叶片绕流的影响问题进行了数值模拟。数值模拟结果表明,所发展的程序对振荡叶栅流动模拟具有较好的精度;出口马赫数对振荡叶栅内部非定常流动以及叶片表面的非定常气动力将产生影响;且不同模态下出口马赫数对非定常流动的影响规律表现不尽相同。
The key parameters influencing flutter stability were studied along with an exploratory investigation of the significance of the judgement criterion of the law governing the change of the flutter stability with the aforementioned parameters on the flutter stability. On the basis of further improving the solution-seeking program for the unsteady Reynolds Number averaged N-S equation and based on an influence coefficient method,a numerical simulation was performed of the influence of the outlet Mach number on the three-dimensional flow around the oscillating turbine blades in various vibration modes. The numerical simulation results show that the developed program features a relatively good accuracy for simulating the flow in the oscillating cascade,and the outlet Mach number will exercise a definite influence on the unsteady flow inside the cascade and the unsteady pneumatic force on the blade surface. Moreover,the law governing the influence of the outlet Mach number on the unsteady flow under various modes is found to be not always identical.
出处
《热能动力工程》
CAS
CSCD
北大核心
2010年第1期21-24,共4页
Journal of Engineering for Thermal Energy and Power
基金
国家自然科学基金资助项目(50776003)
关键词
振荡叶栅
非定常流动
振型
数值模拟
马赫数
oscillating cascade,unsteady flow,vibration mode,numerical simulation,Mach number
