狭缝间距变化对冲击-多斜孔壁换热特性影响的数值与试验研究
Numerical and experimental investigation on effect of distance between impingement and effusion plates on heat transfer characteristics of impingement-effusion composite cooling
-
摘要: 数值研究了冲击-多斜孔壁复合冷却方式中,狭缝间距在1D* ~4D*(D*为当量直径)范围内变化时对换热特性的影响,并通过试验研究证明了数值模拟结果的正确性.研究发现,狭缝间距变化,使得冲击射流的发展以及狭缝内的气流抽吸、涡旋的形成受到不同程度的影响,换热效果随着间距的增大先增大后减小.研究还发现,流体微团在狭缝中的流动以平动形式为主,在多斜孔和冲击孔孔内以及邻近区域表现为明显的转动特征.微团转动的增强提高了换热效果.Abstract: The influence of distance between impingement and effusion plates on heat transfer characteristics of impingement-effusion double wall was investigated numerically, and the validity was experimentally verified. Results show that, with the increase of gap distance, heat transfer characteristics increase firstly, and then decrease. The change of gap distance caused different developments of impinging jet and pumping effects, and also led to different heat transfer effects. It shows that fluid particles move in translational mode in most region, but in rotating mode near effusion hole and impinging hole. The stronger fluid particle rotating causes better heat transfer effect.
-
Key words:
- impingement-effusion /
- cooling /
- gap distance /
- pumping effect /
- fluid particle rotating
-
[1] Mellor A M.Design of modern gas turbine combustor[M].New York:Academic Press,1990. [2] 李继保,胡正义.高温升高热容燃烧室设计技术分析[J].燃气涡轮试验与研究,2000,13(4):5-8. [3] 胡娅萍,吉洪湖.孔阵排列疏密度对致密多孔壁冷却效果的影响[J].推进技术,2005,26(1):28-33. HU Yaping, JI Honghu.Effect of porosity of holes array on cooling effectiveness of effusion cooling[J].Journal of Propulsion Technology,2005,26(1):28-33.(in Chinese) [4] Myers G,Geest J V D.Comparison of advanced cooling concepts using color thermography.AIAA 85-1289,1985. [5] Andrews G E,Asere A A.Full coverage discrete hole film cooling:the influence of the number of holes and pressure loss.ASME 90-GT-61,1990. [6] Andrews G E,Bazdidi-Tehrahi F.Small diameter film cooling heat transfer:the influence of the holes length.ASME 91-GT-344,1991. [7] 张勃,李继保,吉洪湖.开孔面积比对冲击-多斜孔壁复合冷却形式冷却特性影响的数值模拟研究[J].航空动力学报,2009,24(10):2235-2240. ZHANG Bo,LI Jibao,JI Honghu.Effect of area ratio of impingement hole to effusion hole on heat transfer characteristics of impingement-effusion composite cooling[J].Journal of Aerospace Power,2009,24(10):2235-2240.(in Chinese) [8] 张勃,李继保,吉洪湖.冲击多斜孔壁中冲击孔与多斜孔相对开孔位置对换热特性的影响[J].南京航空航天大学学报,2011,43(1):25-29. ZHANG Bo,LI Jibao,JI Honghu.Effect of relative position of impinging hole to effusion hole on heat transfer characteristics of impinging/effusion composite cooling[J].Journal of Nanjing University of Aeronautics and Astronautics,2011,43(1):25-29.(in Chinese) [9] 林宇震,俞文利,刘高恩,等.冲击加发散双层壁冷却方式压降分配对斜孔内对流换热影响的研究[J].航空学报,2003,24(2):97-101. LIN Yuzhen,YU Wenli,LIU Gaoen,et al.Influence of pressure drop distribution on the convection heat transfer inside the inclined hole of impingement/effusion cooling[J].Acta Aeronautica et Astronautica Sinca,2003,24(2):97-101.(in Chinese) [10] 许全宏,林宇震,刘高恩.冲击加多斜孔双层壁冷却方式冲击传热系数[J].大连理工大学学报,2001,41(1):63-66. XU Quanhong,LIN Yuzhen,LIU Gaoen.Heat transfer coefficient of impingement/effusion double wall cooling method[J].Journal of Dalian University of Technology,2001,41(1):63-66.(in Chinese) [11] Gerendas M,Hoeschler K,Schilling T.Development and modeling of angled effusion cooling for the BR715 low emission staged combustor core demonstrator. ADA419282,2001. [12] Sellers J P,Jr.Gaseous film cooling with multiple injection stations[J].AIAA Journal,1963,1(9):2154-2156.
点击查看大图
计量
- 文章访问数: 1559
- HTML浏览量: 0
- PDF量: 34
- 被引次数: 0