Large-eddy simulation of non-isothermal flow over an array of cylinders inside a channel

被引:0
|
作者
Jogee, Sourabh [1 ]
Anupindi, Kameswararao [1 ]
机构
[1] Indian Inst Technol Madras, Dept Mech Engn, Chennai 600036, TN, India
关键词
Converging channel; Large-eddy simulation; Channel flow; Heat transfer; Array of cylinders; Trailing-edge; Heated cylinder; HEAT-TRANSFER CHARACTERISTICS; EDGE COOLING CHANNEL; LINE PIN-FINS; THERMAL PERFORMANCE; FIELD ANALYSIS; TURBINE BLADE; WEDGE DUCT; ROTATION;
D O I
10.1016/j.ijthermalsci.2023.108507
中图分类号
O414.1 [热力学];
学科分类号
摘要
This work evaluates the flow and thermal characteristics of a gas-turbine blade trailing-edge. The study is carried out using large-eddy simulation (LES) for Reynolds number, Re = 5900. In view of the realistic conditions, a converging channel with a staggered arrangement of fins with varying aspect ratio is considered for the higher pressure of the coolant and the larger temperature difference between the blade and the coolant. The present results are compared with the parallel channel case to identify the effects of converging flow passage of the channel on the flow and thermal characteristics. The computational setup and methodology are thoroughly validated using reference data from experiments as well as LES available in the literature. The results are analyzed in terms of Q-criterion, streamlines, vorticity and turbulent heat flux contours, and the Nusselt number profiles at several locations in the flow domain. The present results shows, unlike in the parallel channel case, a dominant spanwise component of velocity that helps in the formation of a strong vortex behind the first row itself, and the Nusselt number consistently increases from the first to the last row. The maximum gain and diffusion of turbulent heat flux occur within a recirculation zone and along the free-shear layer, respectively. The heat flux from the end-wall is extracted mainly by the spanwise velocity component, which is also responsible for its advection to the central region. Heat transfer is observed to be higher from fins compared to the end-walls, which underscores the importance of the active participation of fins in the analysis of heat transfer at the trailing-edge.
引用
收藏
页数:18
相关论文
共 50 条
  • [21] Large-eddy simulation and wall modelling of turbulent channel flow
    Chung, D.
    Pullin, D. I.
    JOURNAL OF FLUID MECHANICS, 2009, 631 : 281 - 309
  • [22] Large-Eddy Simulation of Particle-Laden Channel Flow
    Kuerten, J. G. M.
    Quality and Reliability of Large-Eddy Simulations, 2008, 12 : 367 - 378
  • [23] Large-eddy simulation of spatial transition in plane channel flow
    Schlatter, P
    Stolz, S
    Kleiser, L
    JOURNAL OF TURBULENCE, 2006, 7 (33): : 1 - 24
  • [24] Large-eddy simulation of turbulent cavitating flow in a micro channel
    Egerer, Christian P.
    Hickel, Stefan
    Schmidt, Steffen J.
    Adams, Nikolaus A.
    PHYSICS OF FLUIDS, 2014, 26 (08)
  • [25] Large-Eddy Simulation of acoustic propagation in a turbulent channel flow
    Comte, Pierre
    Haberkorn, Marie
    Bouchet, Gilles
    Pagneux, Vincent
    Auregan, Yves
    DIRECT AND LARGE-EDDY SIMULATION VI, 2006, 10 : 521 - +
  • [26] Large-eddy simulation of open channel flow with surface cooling
    Walker, R.
    Tejada-Martinez, A. E.
    Martinat, G.
    Grosch, C. E.
    INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, 2014, 50 : 209 - 224
  • [27] Large-eddy simulation of turbulent flow in a channel with rib roughness
    Cui, J
    Patel, VC
    Lin, CL
    INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, 2003, 24 (03) : 372 - 388
  • [28] !Large eddy simulation of flow over inclined wavy cylinders
    Zhang, Kai
    Katsuchi, Hiroshi
    Zhou, Dai
    Yamada, Hitoshi
    Lu, Jiabao
    JOURNAL OF FLUIDS AND STRUCTURES, 2018, 80 : 179 - 198
  • [29] Large-eddy simulation of turbulent flow over a rough surface
    Xie, ZT
    Voke, PR
    Hayden, P
    Robins, AG
    BOUNDARY-LAYER METEOROLOGY, 2004, 111 (03) : 417 - 440
  • [30] Large-Eddy Simulation of Turbulent Flow Over a Rough Surface
    Zhengtong Xie
    Peter R. Voke
    Paul Hayden
    Alan G. Robins
    Boundary-Layer Meteorology, 2004, 111 : 417 - 440