内外流场耦合法数值研究Rijke管声学特性  

Investigation on Rijke pipe's acoustic characteristics by numerical simulation:modeling the pulsing flow field coupled the inner of pipe with its outer space

作　　者：钟英杰[1] 邓凯[1] 张国俊[1] 林海浩[1] 李华[1] 

机构地区：[1]浙江工业大学能源与动力工程研究所脉动技术工程研究中心,杭州310014

出　　处：《声学学报》2007年第6期559-565,共7页Acta Acustica

基　　金：国家自然科学基金(50576087);浙江省自然科学基金(Z503122)资助项目

摘　　要：基于流体力学、传热学和声学研究成果,采用内外流场耦合建模的方法研究Rijke管脉动内流场,解决了大振幅驻波热声场管口边界条件的处理和出现数值发散的问题。从能量平衡的角度出发,提出非定常的热流量与声压、质点振速之间关系的假设。依靠自身参量,如气体的脉动压力、脉动流速和温度波动,来激发Rijke管振荡.模拟了Rijke管的声学特性,分析了Rijke管自激励振荡的机理。运用该模拟方法对不同尺寸、不同管口形状的Rijke管进行了数值实验,模拟结果与实验结果较好吻合,能捕捉Rijke管的管口声学特征量。Based on the results of fluid dynamics, heat transfer and acoustics, a Computational Fluid Dynamics （CFD） method was utilized to study the acoustic characteristics and self-excited pulsation mechanism inside a Rijke pipe. To avoid settling the irrational boundary conditions of the finite-amplitude standing wave in Rijke thermoacoustic system, the simulation modeling in the flow field, which coupled the inner of pipe 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, oscillation pressure and oscillation velocity was presented. To reflect the essence of Rijke pipe, simulation on self-excited oscillation was obtained by means of its own pulsation of pressure, velocity and temperature. This method can make the convergence process steady and effectively avoid the divergence. The physical phenomenon of self-excited Rijke pipe was analyzed. Moreover, the mechanisms on Rijke pipe＇s self-excited oscillation were explained. Based on this method, comparative researches on the acoustic characteristic of Rijke pipe with different size and different shape of nozzle were performed. The simulation results agreed with the experimental data satisfactorily. Results showed that this numerical simulation can be used for studying the sound pressure of nozzle for the engineering application of Rijke pipe.

关 键 词：RIJKE管 声学特性 数值研究 内外流场 耦合法 模拟方法 脉动压力 数值实验 

分 类 号：O422[理学—声学]