【摘要】：分叉管道常見于工程上的流量分配裝置、飛行器內(nèi)外涵道結(jié)構(gòu),其中分流流道的流動結(jié)構(gòu)影響著主流道的通流量,且回流渦的產(chǎn)生與擴(kuò)大會引起分流流道的阻塞,使之失去分流的作用。本文采用高速攝影對分流流道內(nèi)部的流動結(jié)構(gòu)進(jìn)行識別,發(fā)現(xiàn)在其入口處存在明顯的回流渦,進(jìn)而對回流渦處壁面進(jìn)行了壓力動態(tài)測量。壓力動態(tài)測試與高速攝影的結(jié)果顯示出分流通道中回流渦流場變化的頻率信息。在不同的管道入口雷諾數(shù)(Re_(in)=80249到179414)下,回流渦處的壁面壓力變化具有混沌特性,隨著入口雷諾數(shù)的增加,壓力脈動的幅值增大,而隨機(jī)性卻減小,確定性和穩(wěn)定性增強(qiáng),且在回流渦產(chǎn)生位置尤為顯著,影響整個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.
【作者單位】： 上海交通大學(xué)燃?xì)廨啓C(jī)研究院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(No.51276108)
【分類號】：O35

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本文編號：2288438