Effects of Aspect Ratio on the Turbulent Heat Transfer of Regenerative Cooling Passage in a Liquid Rocket Engine

Turbulent flows and related heat transfer in a regenerative cooling passage of liquid rocket engine are investigated by turbulence models. At a constant mass flow rate, three-dimensional characteristics of flow and heat transfer are studied by changing the aspect ratio under constant or variable heat flux conditions. The cooling passage shows different flow structures, which cannot be found in a straight duct, because the heated wall has a convex-concave-convex curvature. So, the streamwise velocity and secondary flows are varied by the geometrical feature of curvature inversion. From these characteristics the thermal field in the cooling passage is discussed depending on the variation of cross-sectional area and the aspect ratio. Also, the influences of aspect ratio coupled to the thermal boundary condition are investigated. Finally, the geometric effects on the local heat transfer and the change of flow structure are scrutinized.

[1]  S. Gavrilakis,et al.  Numerical simulation of low-Reynolds-number turbulent flow through a straight square duct , 1992, Journal of Fluid Mechanics.

[2]  Hyung Jin Sung,et al.  A new low-Reynolds-number k-ϵ-fμ model for predictions involving multiple surfaces , 1997 .

[3]  Carlos Henrique Marchi,et al.  NUMERICAL SOLUTIONS OF FLOWS IN ROCKET ENGINES WITH REGENERATIVE COOLING , 2004 .

[4]  B. Launder,et al.  THE NUMERICAL COMPUTATION OF TURBULENT FLOW , 1974 .

[5]  Abdullah Ulas,et al.  Numerical analysis of regenerative cooling in liquid propellant rocket engines , 2013 .

[6]  Brian Launder,et al.  Second-moment closure for the near-wall sublayer - Development and application , 1989 .

[7]  J. Zhu,et al.  On the higher-order bounded discretization schemes for finite volume computations of incompressible flows , 1992 .

[8]  M. Onofri,et al.  Flow Analysis of Transcritical Methane in Rectangular Cooling Channels , 2008 .

[9]  Hyung Jin Sung,et al.  Development of a nonlinear near-wall turbulence model for turbulent flow and heat transfer , 2001 .

[10]  S. Lele.  Compact finite difference schemes with spectral-like resolution , 1992 .

[11]  H. W. Zhang,et al.  Numerical Study of Film and Regenerative Cooling in a Thrust Chamber at High Pressure , 2007 .

[12]  F. Nasuti,et al.  A Quasi-2-D Model for the Prediction of the Wall Temperature of Rocket Engine Cooling Channels , 2011 .

[13]  Bing Sun,et al.  Numerical Simulation of Liquid Rocket Engine Thrust Chamber Regenerative Cooling , 2011 .

[14]  T. Shih,et al.  New time scale based k-epsilon model for near-wall turbulence , 1993 .

[15]  T. Park.  NUMERICAL STUDY OF TURBULENT FLOW AND HEAT TRANSFER IN A CONVEX CHANNEL OF A CALORIMETRIC ROCKET CHAMBER , 2004 .