本文關(guān)鍵詞：傾斜和肋化靶面陣列射流沖擊換熱特性研究　出處：《南京航空航天大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 陣列沖擊 冷卻空氣管 傾斜靶板 帶肋表面 換熱特性 試驗研究

【摘要】：隨著高效節(jié)能發(fā)動機(jī)的發(fā)展,對航空發(fā)動機(jī)各部件效率、壽命和安全性也提出越來越高的要求,航空發(fā)動機(jī)葉尖間隙控制是上述目標(biāo)實現(xiàn)的一個重要保證。本文針對某型多級低壓渦輪主動間隙控制裝置中冷卻空氣系統(tǒng),通過合理的簡化,抽象出典型換熱單元進(jìn)行試驗研究,為其改進(jìn)設(shè)計提供基礎(chǔ)數(shù)據(jù)參考。首先分別針對單根冷卻管和多冷卻管沖擊傾斜靶面,開展了換熱特性試驗研究。重點分析沖擊Re數(shù)(6000、9000、12000),沖擊間距比H/d(2.73、4.55、6.36)對換熱效果的影響,并通過比較單冷卻管與多冷卻管不同條件下,靶面特定位置上換熱系數(shù)的差異來研究多冷卻管工況中上游管沖擊形成橫流的影響。研究中發(fā)現(xiàn),由于冷卻管沿程空氣出流量的變化,使得靶板表面在沿著冷卻管流向上,局部Nu先減小后增大。多冷卻管陣列沖擊時,沖擊產(chǎn)生的橫流會進(jìn)一步提升靶面的換熱系數(shù)。試驗結(jié)果表明,隨著沖擊Re數(shù)的增加,靶面換熱效果提升明顯。沖擊間距比H/d減小后,也能提高靶面的換熱系數(shù)。本文的研究工況中,靶面換熱效果在H/d=2.73時達(dá)到最佳值。隨后本文試驗研究了非規(guī)則陣列沖擊帶肋靶板的換熱特性,分析了沖擊Re數(shù)(2000-15000),沖擊孔間距比Sy/d(4-20)、沖擊間距比Sz/d(6、8、10)對換熱效果的影響。研究中發(fā)現(xiàn),靶面存在高肋后,顯著改變了靶面的沖擊換熱效果。在斜向沖擊和靶面高肋的共同作用下,沖擊滯止點周邊5倍沖擊孔直徑的范圍內(nèi)均有較好的強化換熱效果。試驗結(jié)果表明:靶面換熱系數(shù)隨著沖擊雷諾數(shù)Re的增加而變大。沖擊間距比Sz/d對平均Nu數(shù)影響非單調(diào),小沖擊Re數(shù)工況下,大沖擊間距比能夠獲得較高的換熱系數(shù),而在高沖擊Re數(shù)工況下,小沖擊間距有助于提高強化換熱效果。當(dāng)沖擊孔間距比Sy/d減小時,靶面平均換熱系數(shù)增加顯著。
[Abstract]:With the development of high efficiency and energy saving engine, the efficiency, life and safety of aero-engine components are required more and more. The tip clearance control of aero-engine is an important guarantee to achieve the above goal. In this paper, the cooling air system in a multi-stage low-pressure turbine active clearance control device is reasonably simplified. Abstract the typical heat transfer unit for experimental study to provide basic data for the improvement of the design. First, the single cooling tube and the multiple cooling tube impact on the inclined target. The experimental study on heat transfer characteristics has been carried out with emphasis on the analysis of the impact re number of 6 000 ~ 9 000 ~ (12 000) and the impact spacing ratio of H / D ~ (2. 73) ~ (5) ~ (4.55). 6.36) the effect on the heat transfer efficiency, and by comparing the single cooling tube with the multi-cooling tube under different conditions. The difference of heat transfer coefficient in the specific position of the target surface is used to study the influence of the upstream tube impact on the cross flow in the multi-cooling tube working condition. It is found that the variation of the air flow rate along the cooling tube is due to the change of the heat transfer coefficient. The local Nu decreases first and then increases along the flow direction of the cooling tube. The cross flow produced by the impact will further increase the heat transfer coefficient of the target surface during the impact of the multi-cooling tube array. The experimental results show that the heat transfer coefficient of the target surface will be further increased. With the increase of impact re number, the heat transfer efficiency of target surface is improved obviously. When the impact distance is smaller than H / d, the heat transfer coefficient of target surface can also be increased. The heat transfer effect of target surface reaches the optimum value when H / D = 2.73. Then the heat transfer characteristics of irregular array impacting ribbed target are studied, and the impact re number is analyzed (2000-15000). The effect of the impact hole spacing on the heat transfer efficiency is compared with that of Syr / D _ (4-20) and S _ (z / D ~ (6) / 8 ~ (10)). It is found that there is a high rib on the target surface. The effect of impact heat transfer on the target surface is obviously changed, under the joint action of oblique impact and high rib of the target surface. In the range of 5 times the diameter of the impingement hole around the impingement point, the heat transfer effect is better. The experimental results show that:. The heat transfer coefficient of target surface increases with the increase of impact Reynolds number re. The impact distance ratio Sz/d has a non-monotone effect on the average Nu number. Under the condition of small impact re number, the high impact distance ratio can obtain higher heat transfer coefficient, while under high impact re number condition, the heat transfer coefficient can be obtained. Small impact spacing is helpful to improve the heat transfer efficiency. When the impact hole spacing is smaller than that of Sy/d, the average heat transfer coefficient of the target surface increases significantly.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：V231.1

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本文編號：1387771