卡门涡街激发直管内声场的实验研究  

Experimental research on the acoustic field excited by karman vortex street in a straight duct

作　　者：王岩[1] 王恒栋[1] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《能源工程》2015年第3期1-7,共7页Energy Engineering

摘　　要：搭建了一方型长直管实验台,利用钝体绕流生成卡门涡街,首先研究冷态条件下涡脱落激发直管内一维声场的特性,为后续研究涡街激发热声不稳定提供实验基础与参考依据。试验测量了不同涡街频率及两种代表性涡脱落位置下激发产生的声学脉动压力信号,分析了二者对激发管内一维声场的影响。试验发现,涡街激发的声场是多频率不同强度的声波叠加的结果,与旋流燃烧器的热声不稳定特性相似;激发出的声波频率、幅值与涡街频率及涡脱落位置有关,且只有部分涡街频率下的激发声波表现驻波特性。An experimental setup including a long straight square tube has been built firstly to investigate features of one-dimensional acoustic field excited by vortex shedding in cold condition which is Karman vortex street generated by flow around a bluff body here. The experimental results can provide an experimental basis and reference for the followup research of thermoacoustic instability excited by vortex shedding. Acoustic pressure-oscillating signals with variable vortex frequence and two typical shedding positions were measured and effects of them on the one-dimensional acoustic field in the tube were analyzed. The results showed that acoustic field excited by vortex shedding consists of acoustic waves with various frequencies and amplitudes,which was similar to the characteristics of thermoacoustic instability in swirl burners. Excited frequency and amplitude of acoustic wave was related to vortex frequency and shedding position.Moreover,excited acoustic wave showed the feature of standing wave only under certain vortex frequency.

关 键 词：卡门涡街 一维声场 频谱分析 驻波 热声不稳定 

分 类 号：TB53[理学—物理]