单管传输特性的改进模型与实验研究  

Modified model for transmission characteristic of single tube and its experimental verification

作　　者：王波[1] 邱利民[1] 孙大明[1] 白昆[1] 刘钰[1] 

机构地区：[1]浙江大学制冷与低温研究所,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2010年第2期403-407,共5页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(E50825601);教育部新世纪人才计划资助项目(NCET-06-0521)

摘　　要：为了描述单根圆形管道的传输特性,在流体网络理论的基础上,参考Rott的波动方程和Swift对紊流的修正方法,提出单管传输特性的改进模型.在模型中讨论了流动为紊流时的修正方法:当R/δv较小时,利用Swift的修正方法进行修正;当R/δv较大且修正因子n>1时,利用n对紊流进行进一步修正.为了对模型进行验证,以声压放大器这一典型的单管道为例开展了实验研究.紊流时在R/δv较小的情况下,改进模型和DeltaE的计算结果一致,与实验吻合良好;在R/δv较大的情况下,改进模型由于充分考虑了径向上的对流换热损失,其计算结果与Del-taE相比更加接近实验结果.A modified model was proposed based on the fluid network theory,Rott＇s wave equation,and Swift＇s correction method for turbulence in order to describe the transmission characteristic of a single circular tube.The correction methods for turbulence were discussed.Swift＇s correction method is used when R/δv is small,and further correction is made using factor n when R/δv is large and n1.An acoustic amplifier was taken as example.The calculation results of the turbulence flow at small R/δv by the model and DeltaE agreed well with the experimental results.When the flow was turbulent at large R/δv,the results of the model were closer to the experimental results than DeltaE because the model considered convective heat transfer loss in radical direction.

关 键 词：声压放大器 惯性管 单管 热声理论 传输特性 

分 类 号：TP317.4[自动化与计算机技术—计算机软件与理论] TU832.13[自动化与计算机技术—计算机科学与技术]