Detailed Flowfield Predictions of Heat Transfer to Supercritical Fluids in High Aspect Ratio Cooling Channels

Coupled Heat Transfer of Supercritical n-Decane in a Curved Cooling Channel

“…Most investigations implemented coupled heat transfer to simulate asymmetrically heated cooling channels because the temperature fields of the fluid region obtained with and without wall heat conduction are significantly different [2]. Previous studies showed that the selected geometries, fluids (hydrogen, nitrogen, methane), and boundary conditions were close to those expected in the regenerative cooling system of rocket engines (Froelich et al [3], Neuner et al [4], Jung et al [5], DiValentin and Naraghi [6], Kang and Sun [7], Pizzarelli et al [2,[8][9][10][11][12][13][14], Negishi et al [15], Ruan and Meng [16], and Wang et al [17]). A high aspect ratio cooling channel (HARCC) has been widely used in the regenerative cooling system of rocket engines.…”

“…The Spalart-Allmaras (SA), linear k − ϵ, and linear k − ω turbulence models cannot describe the secondary motion of Prandtl's second kind because these turbulence models predict the normal Reynolds stress inaccurately [28]. A nonlinear k − ω turbulent model was adopted in the work conducted by Jung et al [5], and the secondary flow in a straight HARCC was captured successfully. Jung et al [5] indicated that heat transfer improved because of this kind of secondary flow.…”

“…A nonlinear k − ω turbulent model was adopted in the work conducted by Jung et al [5], and the secondary flow in a straight HARCC was captured successfully. Jung et al [5] indicated that heat transfer improved because of this kind of secondary flow. The secondary flow of Prandtl's second kind can also be captured by the Reynolds stress model (RSM).…”

Numerical study of supercritical-pressure fluid flows and heat transfer of methane in ribbed cooling tubes

“…The early studies on supercritical-pressure fluid flows and heat transfer focused mainly on water, carbon dioxide, hydrogen, and heavy hydrocarbon fuels [1][2][3][4][5][6][7][8][9][10][11][12][13], because of their practical/potential applications in nuclear reactors, refrigeration, aerospace propulsion and industrial power-generation systems. In recent years, because of the renewed interest in using cryogenic methane as an alternative propellant in aerospace propulsion systems [14,15], many studies on the supercritical-pressure fluid flows and heat transfer of cryogenic methane have been carried out, intended for fundamental understanding and practical applications of the regenerative engine cooling technology [16][17][18][19][20][21][22].…”

Cooling Channel Analysis of a LOX/LCH4 Rocket Engine Demonstrator

“…For this reason, CFD solvers are introduced to study the coolant flow inside cooling channels even if the coupling with the hot gas flow is not considered. [14][15][16][17] Moreover, if the aim is to focus on the coolant flow characteristics only (e.g., flow curvature), the analysis can be further simplified disregarding also the coupling with the solid material heat transfer. [18][19][20][21][22][23][24] Recently, as the computational resources increase, coupled CFD analyses for the whole regeneratively-cooled thrust chamber are also performed.…”