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对弯管二次流的研究因弯管技术在各工程领域的广泛应用而得到了发展。本研究在总结国内外大量文献资料的基础上,首先对弯管二次流形成原因、流动特性及研究方法(实验研究法、数值分析法和计算流体动力学研究法)进行了综述;其次,分析了弯管二次流对电厂锅炉烟风系统及锅炉经济运行的影响;最后,总结了电厂锅炉送风系统和SCR反应器烟道内采用的弯管均流技术,并针对大尺寸弯管内高雷诺数湍流流动均流技术进一步研究进行了展望。
The research on elbow secondary flow has been developed due to the extensive application of elbow technology in various engineering fields. Based on the summary of a large number of domestic and foreign literatures, this paper firstly summarizes the forming reasons, flow characteristics and research methods (experimental research method, numerical analysis method and computational fluid dynamics research method) of secondary flow in elbow pipe. Secondly, The influence of the secondary flow of elbow on the economic operation of the boiler’s flue-gas system and the boiler was analyzed. Finally, the current-sharing technology of the elbow in the flue gas duct of the power plant boiler and the SCR reactor was summarized. High Reynolds number of turbulent flow of current-sharing technology for further research prospects.