Numerical Simulation of Oscillatory Flow in Self-excited Rijke Tube: Investigation on Mechanisms of Pulsation
A computational fluid dynamics (CFD) technique was utilized to study the pulsation mechanism inside Rijke tube. The simulation method of modeling in external flow field, which coupled the inner of Rijke tube with its outer space was carried out to replace the traditional way in form of internal flow field numerical investigations. A hypothesis for heat source in energy equation including the relationship on unsteady heat of air around heat source (q′), oscillation pressure (p′) and oscillation velocity (u′) in expression of q′=k·|p′·u′| was presented. Boundary conditions of tube wall and heating model were dealt with rationally. To reflect the essence of Rijke tube, simulation on self-excited oscillation was obtained by means of pulsation of pressure, velocity and temperature. Cloud chart on pressure distribution of nozzle and leakage value of sound pressure were shown also. The nozzle effect of Rijke tube for the future reducing noise study could be obtained without assuming the boundary conditions on inlet and outlet of the pipe. The validity of simulation was tested by interrelated experiments latter. The physical phenomenon of self-excited Rijke tube was analyzed. Therefore, modeling in external flow field, the model of heat source in this paper, simulation with pulsation of pressure, velocity and temperature were correct and effectual for fitting the fact better. Moreover, the mechanism on Rijke tube’s self-excited oscillation were explained. The sound pressure of nozzle was investigated for the engineering development of Rijke tube.
Rijke pipe Numerical simulation Source module Nozzle effect Pulse flow
Deng Kai Zhong Yingjie Zhang Xuemei Li Hua Lin Haihao Cai Luyin
Engineering Research Center of Pulse Technology, The MOE Key Laboratory of Mechanical Manufacture and Automation, Zhejiang University of Technology, No.6 Zhaohui District, Hangzhou, P. R. China
国际会议
2007杭州国际动力工程会议(The International Conference on Power Engineering 2007)
杭州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）