分流流道内流动结构的测试与分析
发布时间：2018-10-23 07:09
【摘要】：分叉管道常见于工程上的流量分配装置、飞行器内外涵道结构,其中分流流道的流动结构影响着主流道的通流量,且回流涡的产生与扩大会引起分流流道的阻塞,使之失去分流的作用。本文采用高速摄影对分流流道内部的流动结构进行识别,发现在其入口处存在明显的回流涡,进而对回流涡处壁面进行了压力动态测量。压力动态测试与高速摄影的结果显示出分流通道中回流涡流场变化的频率信息。在不同的管道入口雷诺数(Re_(in)=80249到179414)下,回流涡处的壁面压力变化具有混沌特性,随着入口雷诺数的增加,压力脉动的幅值增大,而随机性却减小,确定性和稳定性增强,且在回流涡产生位置尤为显著,影响整个分流流道的通流能力。
[Abstract]:Bifurcation pipeline is a common flow distribution device in engineering. The flow structure of the internal and external ducts of the aircraft, in which the flow structure of the shunt channel affects the flow rate of the main channel, and the generation and expansion of the backflow vortex will cause the obstruction of the shunt channel. Make it lose its function of shunt. In this paper, high speed photography is used to identify the internal flow structure of the shunt channel, and it is found that there is an obvious reflux vortex at the entrance of the flow channel, and then the pressure on the wall of the circumfluence vortex is measured dynamically. The results of dynamic pressure measurement and high speed photography show the frequency information of the variation of reflux vortex field in the shunt channel. Under different inlet Reynolds numbers (Re_ (in) = 80249 to 179414), the variation of wall pressure at the reflux vortex is chaotic. With the increase of inlet Reynolds number, the amplitude of pressure fluctuation increases, but the randomness decreases, and the certainty and stability increase. Especially in the position where the reflux vortex is generated, the flow capacity of the whole shunt channel is affected.
【作者单位】： 上海交通大学燃气轮机研究院;
【基金】：国家自然科学基金资助项目(No.51276108)
【分类号】：O35
[Abstract]:Bifurcation pipeline is a common flow distribution device in engineering. The flow structure of the internal and external ducts of the aircraft, in which the flow structure of the shunt channel affects the flow rate of the main channel, and the generation and expansion of the backflow vortex will cause the obstruction of the shunt channel. Make it lose its function of shunt. In this paper, high speed photography is used to identify the internal flow structure of the shunt channel, and it is found that there is an obvious reflux vortex at the entrance of the flow channel, and then the pressure on the wall of the circumfluence vortex is measured dynamically. The results of dynamic pressure measurement and high speed photography show the frequency information of the variation of reflux vortex field in the shunt channel. Under different inlet Reynolds numbers (Re_ (in) = 80249 to 179414), the variation of wall pressure at the reflux vortex is chaotic. With the increase of inlet Reynolds number, the amplitude of pressure fluctuation increases, but the randomness decreases, and the certainty and stability increase. Especially in the position where the reflux vortex is generated, the flow capacity of the whole shunt channel is affected.
【作者单位】： 上海交通大学燃气轮机研究院;
【基金】：国家自然科学基金资助项目(No.51276108)
【分类号】：O35
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