【摘要】 确定绕流流体作用在振动管束上的流体激振力是分析换热器管束流体弹性稳定性的关键。该文应用参数多项式方法,在直接求解粘性流方程的基础上确定管束流动中作用在振动圆管上的非定常气动力及流体激振特性,包括振动圆管的表面非定常压力分布、各种振型条件下的非定常气动力作功性质的变化、来流速度变化对非定常气动力作功的影响,并在此基础上进行管束流动的气动弹性稳定性分析及确定临界流速。研究发现管子振型对于非定常气动力作功有十分重要的影响,甚至会改变作功的正负。该文的研究是基于求解流动基本方程基础上分析管束振动流 体弹性稳定性的新进展。更多还原

【Abstract】 The flow induced vibration of tube arrays is very important in heat exchanger. The key elements necessary to accurately predict fluidelastic instability of tube arrays in crossflow are motion-dependent fluid force. The equations of vicious flow are solved directly by using parameter polynomial method to determine the fluid force and the flow induced vibration characteristics. Then the distribution of unsteady pressure on the surface of vibrating tube, the property of aerodynamic work, positive or negative, under different vibration mode, the relation between incoming flow and aerodynamic work etc. can be obtained. For different condition, the fluidelastic stability and the critical velocity are determined. The results show that the vibration mode affect the unsteady work greatly. In some cases, it can change the property of the unsteady work. In this paper the method is developed to analyze the fluidelastic stability of tube arrays.更多还原