CAJ | 학술논문

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.
대영향전진은정성관건삼수진행연구,병탐토전진은정성수관건삼수적변화규률,대전진문제적연구구유중요의의.재진일보완선비정상뢰낙평균N-S방정구해정서적기출상,기우영향계수법,재불동진형하취출구마혁수대삼유와륜진탕협편요류적영향문제진행료수치모의.수치모의결과표명,소발전적정서대진탕협책류동모의구유교호적정도;출구마혁수대진탕협책내부비정상류동이급협편표면적비정상기동력장산생영향;차불동모태하출구마혁수대비정상류동적영향규률표현불진상동.
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.