Abstract

The modes of small oscillations are studied in a rod having an axis in the shape of a three-turn cylindrical helix using the expansion into oscillating eigenmodes and the method of vortex elements. Oscillationós are excited by pressure pulsations generated as a result of the processes of intense vortex formation when a spatial incompressible flow flows around the rod. The polyharmonic nature of unsteady loading and the response of the oscillatory system are demonstrated, as is the potential shown to develop intrinsic resonances in these systems. The results and modeling technique can be used to assess the durability of spiral tube bundles in heat exchangers.

中文翻译：

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研究涡流下的螺旋杆振荡

摘要

利用扩展为振荡本征模和涡旋元素的方法，研究了具有三轴圆柱螺旋形状的轴的杆中的小振荡模式。当空间不可压缩流围绕杆流动时，由于强烈涡流形成过程而产生的压力脉动会激发振动。证明了不稳定载荷的多谐性质和振动系统的响应，以及在这些系统中产生固有共振的潜力。结果和建模技术可用于评估热交换器中螺旋管束的耐用性。