开缝钝体尾流水模显示实验研究

A Study of the Near Wake Flow behind a Slit Bluff Body with Water Flow Pattern Visualization

采用水模拟氢气泡流动显示的方法对开缝钝体近尾流结构进行了实验研究．结果表明，二维对称结构中产生的中缝偏斜射流对钝体两边脱体剪切层的相互干涉起到抑止作用，从而加长了回流区，降低了压力损失．该实验不仅证实了开缝钝体燃烧器优良的尾流特性。

By the method of water flow pattern visualization with hydrogen bubbles, the near wake flow behind a slit bluff body has been experimentally studied. The results obtained show that, of a symmetrical 2 D construction, the skew jet in the middle slit will suppress the mutual influence between the detached shearing layers on both sides of the bluff body, and the vortex interference behind the bluff body remarkably affects the recirculation zone. The interference will then enlarge the recirculation zone and lower the pressure loss. Such a test provides a directly visible basis for understanding the advantageous characteristics of the wake flow of a bluff body.