【24h】

Optimization of baffle configurations to prevent aeroacoustic instabilities in heat exchangers: a preliminary study

机译:优化挡板结构以防止热交换器中的空气声不稳定:初步研究

获取原文

摘要

It is well known that gas heat exchangers are prone to aeroacoustic instabilities, which oftenlead to severe noise levels, structural vibrations and fatigue. These are unacceptable, as theythreaten the component integrity and expose the plant workers to excessive noise levels.Such phenomenon is due to a cooperative interplay between the Karman vortices generatedby the cross-flow and the heat exchanger acoustical modes (mainly those transverse tothe tube banks). Energy exchanges are then such that, for certain operating velocities,self-excitation of one or more acoustical modes arises. Actually, this problem is solvedby placing rigid baffles inside the container, which modify the acoustic modal fields andeventually inhibit the instability. However, an effective location of such baffles is moreor less difficult depending on the system complexity and on the range of flow velocities ofinterest. For realistic industrial components - using a restricted number of acoustical baffles- their optimal location is a challenging problem, as trial and error experimentation is oftena costly and frustrating procedure. In this paper we propose a strategy for the optimallocation of a given number of baffles, in order to inhibit instability of the acoustical modesin a given frequency range. Our approach is based on a stochastic global optimizationtechnique and the preliminary results obtained are promising.
机译:众所周知,气体热交换器易于发生空气声不稳定,这常常导致严重的噪声级,结构振动和疲劳。这些是不可接受的,因为它们会破坏组件的完整性并使工厂工人面临过度的噪声水平。这种现象是由于错流和换热器的声学模式(主要是横向于管束的声学模式)之间产生的卡曼涡旋相互作用共同作用的结果。 。然后进行能量交换,使得对于某些操作速度,出现一种或多种声学模式的自激。实际上,这个问题是通过在容器内放置刚性隔板来解决的,刚性隔板改变了声模场并最终抑制了不稳定性。然而,取决于系统的复杂性和感兴趣的流速范围,这种挡板的有效位置或多或少地困难。对于实际的工业组件-使用数量有限的隔音板-最佳位置是一个具有挑战性的问题,因为反复试验往往是昂贵且令人沮丧的过程。在本文中,我们提出了一种用于给定数量的挡板的最佳布置的策略,以抑制给定频率范围内声学模式的不稳定性。我们的方法基于一种随机的全局优化技术,所获得的初步结果是有希望的。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号