恒定有压扩散流中的局部非稳态流动试验研究  

Experimental study on local unsteady-state flow in steady divergent pressure flow

作　　者：高学平[1] 宋慧芳[1] 赵耀南[1] 

机构地区：[1]天津大学建筑工程学院,天津300072

出　　处：《水动力学研究与进展（A辑）》2007年第2期182-187,共6页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金资助项目(50579048)

摘　　要：试验研究了恒定二元水平有压扩散流中的局部非稳态流动现象。利用壁面丝线流动显示技术观测了局部非稳态流动现象,给出了发生局部非稳态流动的临界扩散角;利用三维点流速仪对局部非稳态流动的流速进行了数据采集,通过功率频谱分析和互相关分析,得出了非稳态流动的基本特征;探讨了局部非稳态流动的成因和条件。Based on model experiment, the local unsteady phenomenon in 2-D horizontal flow with steady divergent pressure was studied. Using silk thread affixed to the wall the unsteady phenomenon of the flow was observed, and the critical divergent angle at which the unsteady-state starting was analyzed. The 3-D point velocimeter was employed to collect the velocity data. Basic characters of the unsteady flow were obtained through power spectrum analysis and correlation analysis. Finally the causes and the conditions of the formation of unsteady-state flow are discussed in this paper.

关 键 词：恒定有压扩散流 局部非稳态流动 临界扩散角 流动特征 成因和条件 

分 类 号：TV134.2[水利工程—水力学及河流动力学]