Session: FSI-02-02 Tube Arrays - 2

Paper Number: 106387

106387 - Study on Fluid-Elastic Instability of Tube Bundles in Cross Flow Based on Spatiotemporal Coherence 

The flow-induced vibration (FIV) of tube bundles of heat exchanger is a complex fluid-structure interaction with coupling of multibody. With the impact of the surrounding tubes, the vibration of the tube is excited by forces with different frequencies, and the vibration of tube bundles turns to be nonlinear, which can result in the difficulty in perdition of fluid elastic instability. In this work, the study is performed through water tunnel experiment and numerical simulation. The vibration mode and natural frequency is calculated through simulation, and the FIV study is carried out by water tunnel tests. The target tube array is rotated triangular array with a pitch ratio of 1.33. in the study, the coherence is induced into the analysis of the route to instability. The vibration modes are divided through the coherence and nonlinearity evolution. The critical velocity of FEI is studied with the change of vibration mode. The results show that the vibration mode changes with the frequency ratio. The evolution of Lyapunov exponents shows the nonlinearity of the vibration increases as the number of excited vibration modes. The method and results of this work can be helpful in the prediction critical velocity of FEI in tube bundles in cross flow.

Presenting Author: Kai Guo Yanshan University

Presenting Author Biography: Kai Guo major im flow-induced vibration and fretting wear of process equipment.

Authors:

Kai Guo Yanshan University
Yuxuan Cheng Yanshan University
Xiantao Fan University of Notre Dame
Meiqi Yu Yanshan University
Hongsheng Zhang Yanshan University
Wei Tan Tianjin University