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堵头管中轴对称紊动射流的实验研究
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【化工发展论文】 Experimental study of an axisymmetric turbulent jet discharged into a dead-end tunnel
提要 介绍了采用热膜流速仪量测堵头管中不同受限度轴对称射流的时均流速和流速脉动。根据实验，把堵头管中射流分为自由扩展区、受限扩展区、收缩区和零均流区四个区，并给出了临界断面位置，对现有计算方法进行了改
进。
关键词 受限射流 堵头圆管 热膜测速
Abstract Measures the time mean velocity and velocity fluctuation using a hot film anemometer with different confinement ratio for the axisymmetric turbulent jit I a dead-end tunnel. By analysing the data from the measurement, proposes the division of four flow regions-the free spread, confined spread, contraction and zero-time-averaged-flow regions, and the criterion and flow characteristics for each of them, with a few new empirical formulas derived.
Keywords confined axisymmetric jet dead-end tunnel HWA HFA velocity measurement
1 前言
紊动射流是流体运动的一种重要类型，在航天航空、动力机械、化工设备、自动控制、水力采掘、民用消防、农业喷灌、环境工程、通风空调等许多工程技术部门中都有大量的射流问题。按照射流周围环境条件，射流可分
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