氣膜冷卻流場和溫度場特性的高速紋影研究
發(fā)布時間：2019-02-24 08:47
【摘要】：氣膜冷卻作為一種重要的冷卻手段,已廣泛應(yīng)用于現(xiàn)代燃氣輪機燃燒室和渦輪葉片等高溫部件中,氣膜冷卻效率的提高在維護高溫部件性能和提升整機使用壽命方面有著至關(guān)重要的作用。研究氣膜冷卻流場內(nèi)部結(jié)構(gòu)和相互作用機理對于提高氣膜冷卻效率有很大幫助。本文依托浙江理工大學現(xiàn)有的風洞系統(tǒng)搭建了平板氣膜冷卻實驗臺,結(jié)合改進的紋影系統(tǒng)和圖像采集系統(tǒng),對平板氣膜冷卻流場進行了可視化研究,在吹風比分別為0.5、1.0、1.5、2.0,射流角度分別為30°、45°、60°的工況下,從射流對主流的穿透力,射流在擴展區(qū)域的覆蓋面積,以及射流和主流相互作用形成的渦的結(jié)構(gòu)方面進行了深入研究。結(jié)合數(shù)值模擬的方法,對流場內(nèi)部渦量場、溫度場、密度場的變化進行了分析,并與實驗所得結(jié)果進行了對比,得出以下主要結(jié)論:1、不同工況下射流對主流的穿透力不同。射流角度相同時,隨著吹風比的增大,射流對主流的穿透力增強。吹風比相同時,隨著射流角度的增大,射流對主流的穿透力增強,兩者都呈單調(diào)變化趨勢。2、不同工況下射流在擴展區(qū)域的覆蓋面積變化規(guī)律不同。在入射角為30°時,射流覆蓋面積隨著吹風比的增大而增大,在入射角為45°,吹風比為2.0與吹風比為1.5相比射流覆蓋面積并無明顯變化,在入射角為60°時,吹風比為2.0與吹風比為1.5相比,射流覆蓋面積減小。3、相同吹風比下,隨著入射角的增大,剪切渦和尾跡渦尺度越來越大,越來越明顯。相同射流角度下,隨著吹風比的增大,剪切渦和尾跡渦尺度越來越大,越來越明顯。但是入射角度對剪切渦和尾跡渦的的影響更大。
[Abstract]:As an important cooling method, film cooling has been widely used in modern gas turbine combustor, turbine blade and other high temperature components. The improvement of film cooling efficiency plays an important role in maintaining the performance of high temperature components and improving the service life of the whole machine. The study of the internal structure and interaction mechanism of film cooling flow field is of great help to improve the film cooling efficiency. In this paper, based on the existing wind tunnel system of Zhejiang University of Technology, a flat film cooling experimental platform is built, combined with an improved schlieren system and an image acquisition system, a visualization study on the flat film cooling flow field is carried out. Under the condition that the air blowing ratio is 0.5 ~ (1. 0) / 1. 5 ~ 1. 5 / 2, and the jet angle is 30 擄, 45 / 60, respectively, the coverage area of the jet in the expanded area is obtained from the penetration of the jet to the main stream and the area covered by the jet in the expanded area. And the structure of vortex formed by the interaction of jet and mainstream is studied. Combined with numerical simulation, the variation of vortex field, temperature field and density field in the flow field are analyzed and compared with the experimental results. The main conclusions are as follows: 1. When the jet angle is the same, the penetration of the jet to the main stream increases with the increase of the blowing ratio. When the blowing ratio is the same, with the increase of the jet angle, the penetration of the jet to the mainstream increases, and both of them show a monotone changing trend. 2. The variation of the coverage area of the jet in the expanded area is different under different operating conditions. When the incidence angle is 30 擄, the jet coverage area increases with the increase of the blowing ratio. When the incident angle is 45 擄, the blowing ratio is 2.0 and the blowing ratio is 1.5, the coverage area of the jet does not change significantly, and when the incidence angle is 60 擄, the jet coverage area does not change obviously. When the blowing ratio is 2.0 and the blowing ratio is 1.5, the coverage area of the jet decreases. 3. At the same blowing ratio, the scale of shear vortex and wake vortex becomes larger and more obvious with the increase of the incident angle. At the same jet angle, the scale of shear vortex and wake vortex becomes larger and larger with the increase of blowing ratio. But the incident angle has more influence on the shear vortex and wake vortex.
【學位授予單位】：浙江理工大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TK471
[Abstract]:As an important cooling method, film cooling has been widely used in modern gas turbine combustor, turbine blade and other high temperature components. The improvement of film cooling efficiency plays an important role in maintaining the performance of high temperature components and improving the service life of the whole machine. The study of the internal structure and interaction mechanism of film cooling flow field is of great help to improve the film cooling efficiency. In this paper, based on the existing wind tunnel system of Zhejiang University of Technology, a flat film cooling experimental platform is built, combined with an improved schlieren system and an image acquisition system, a visualization study on the flat film cooling flow field is carried out. Under the condition that the air blowing ratio is 0.5 ~ (1. 0) / 1. 5 ~ 1. 5 / 2, and the jet angle is 30 擄, 45 / 60, respectively, the coverage area of the jet in the expanded area is obtained from the penetration of the jet to the main stream and the area covered by the jet in the expanded area. And the structure of vortex formed by the interaction of jet and mainstream is studied. Combined with numerical simulation, the variation of vortex field, temperature field and density field in the flow field are analyzed and compared with the experimental results. The main conclusions are as follows: 1. When the jet angle is the same, the penetration of the jet to the main stream increases with the increase of the blowing ratio. When the blowing ratio is the same, with the increase of the jet angle, the penetration of the jet to the mainstream increases, and both of them show a monotone changing trend. 2. The variation of the coverage area of the jet in the expanded area is different under different operating conditions. When the incidence angle is 30 擄, the jet coverage area increases with the increase of the blowing ratio. When the incident angle is 45 擄, the blowing ratio is 2.0 and the blowing ratio is 1.5, the coverage area of the jet does not change significantly, and when the incidence angle is 60 擄, the jet coverage area does not change obviously. When the blowing ratio is 2.0 and the blowing ratio is 1.5, the coverage area of the jet decreases. 3. At the same blowing ratio, the scale of shear vortex and wake vortex becomes larger and more obvious with the increase of the incident angle. At the same jet angle, the scale of shear vortex and wake vortex becomes larger and larger with the increase of blowing ratio. But the incident angle has more influence on the shear vortex and wake vortex.
【學位授予單位】：浙江理工大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TK471
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