Validation of Conjugate Heat Transfer Model for Rocket Cooling with Supercritical Methane

Pizzarelli, Marco; Nasuti, Francesco; Votta, Raffaele; Battista, Francesco

doi:10.2514/1.b35945

Cited by 20 publications

(4 citation statements)

References 29 publications

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“…It was widely acknowledged that the low-Reynolds number k-ε type turbulence models have the feature to predict well the variable properties effect and buoyancy effect at supercritical pressure [35]. Recently, the effectiveness of Spalart-Allmaras turbulence model in predicting flow and heat transfer of supercritical methane has been validated [34]. The comparison study of several turbulence models in predict supercritical heat transfer has been carried out [35,36] and LS model (proposed by Launder and Sharma) [37] has been found to perform well in predicting supercritical heat transfer, therefore LS low-Reynolds number eddy viscosity turbulence model is selected in the present study.…”

Section: Governing Equationsmentioning

confidence: 99%

Diameter effect on the heat transfer of supercritical hydrocarbon fuel in horizontal tubes under turbulent conditions

Cheng

Tao

Zhu

et al. 2018

Applied Thermal Engineering

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This article presented a numerical investigation of supercritical heat transfer of hydrocarbon fuel in a series of horizontal tubes with different diameters. It has been carried out by solving Reynolds averaging equations of mass, momentum and energy with the LS low-Reynolds number turbulence model using the pressure-based segregated solver based on the finite volume method. For the purpose of comparison, a four-species surrogate model and a ten-species surrogate model of aviation kerosene RP-3 (Rocket Propellant 3) were tested against the published experimental data. In the current study, tube diameter varied from 2 mm to 10 mm and pressure was 3 MPa with heat flux to mass flux ratios ranging from 0.25 to 0.71 kJ/kg. It has been found that the buoyancy has significant effect on wall temperature non-uniformity in the horizontal tube. With the increase of diameter, the buoyancy effect enhances and the thermal-induced acceleration effect reduces. The buoyancy effect makes wall temperature at the top and bottom generatrices of horizontal tube increase and decrease, respectively. Due to the coupled effect of buoyancy and thermal-induced acceleration caused by the significant change of the properties, as diameter increases, heat transfer deteriorates dramatically at the top generatrix but remains almost unchanged at the bottom generatrix at high heat flux to mass flux ratio. Heat transfer enhancement is observed at low heat flux to mass flux ratio when tube diameter is less than 6 mm. Moreover, the safety analysis has been performed in order to optimally design the supercritical cooling system.

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Section: Governing Equationsmentioning

confidence: 99%

Diameter effect on the heat transfer of supercritical hydrocarbon fuel in horizontal tubes under turbulent conditions

Cheng

Tao

Zhu

et al. 2018

Applied Thermal Engineering

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“…During the continuous combustion of a high-thrust rocket motor, the gas temperature in the main combustion chamber can reach 3227 • C. High temperatures place high demands on the cooling technology of the walls within the thrust chamber [1,2]. Spray cooling technology has garnered significant interest for its capability to dissipate high levels of heat flux with reduced flow rates, addressing the cooling requirements of thrust chambers efficiently.…”

Section: Introductionmentioning

confidence: 99%

Impact of Ceramic Micropillar Array and Fiber Layer Composite Structure on Kinematic and Heat Transfer Characteristics of Single Droplet Impacting a Wall

Zhang,

et al. 2024

Micromachines

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The well-known limitations of spray cooling on high-temperature solids at the Leidenfrost temperature point have been significantly improved by a composite structure of steel micropillar arrays and insulating thin films. However, the physical mechanism of a single droplet impact on the walls of high-temperature composite structures in spray cooling remains elusive. We have experimentally studied and quantified the kinematic and thermal transfer characteristics of a single droplet impacting high-temperature micropillar arrays with fiber membrane composite structures. In particular, micropillar arrays of ceramic materials of different shapes (rectangular and cylindrical) used in this study were made using the more flexible PμSL technique, for which precision reaches the micron level. The results show that the presence and different layouts (embedded or placed on top) of the fiber layer significantly affect the spreading coefficient and thermal transfer efficiency of the droplets after impact. In terms of kinematic characteristics, unrelated to the structure of micropillar arrays, compared to structures without film, the maximum spreading coefficient of droplets significantly increased by more than 40% (43% for rectangular, 46% for cylindrical) when the fiber film was placed on top, and increased by more than 20% (20% for rectangular, 33% for cylindrical) when the fiber film was embedded. In terms of thermal transfer characteristics, at a temperature of 200 °C, the presence of the fiber layer changed the wettability of the surface of the micropillar structure, leading to a certain extension of the total evaporation time of the droplets compared to the surface of the micropillar structure without film.

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“…Bartz first proposes an empirical formula for evaluating the convection heat transfer of hot gas in the thrust chamber [14]. From then on, the Bartz formula combined with the inner wall heat conduction and the tube flow forced convection heat transfer of coolant is widely applied in the thrust chamber heat transfer analysis [15,16]. With the development of computational fluid dynamics and finite element methods, numerical simulation is more likely to be used to solve the heat transfer problems because of its accuracy and more comprehensive information [17].…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Analysis and Structural Optimization for Spiral Channel Regenerative Cooling Thrust Chamber

Ping

et al. 2023

International Journal of Aerospace Engineering

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There is currently a lack of efficient heat transfer analysis methodologies for spiral channel regenerative cooling that has been increasingly applied in liquid rocket engines. To figure out the heat transfer characteristics of the spiral channel regenerative cooling thrust chamber, a simple 1D method based on the traditional semi-empirical formula after correcting the flow velocity is proposed. The accuracy of this approach is verified by the 3D numerical simulation. The verified method is further used to analyze the distribution of inner wall temperature in the test case and optimize the channel’s parameters. The research shows that the maximum inner wall temperature cooled by the spiral channel is 8.5% lower than that of the straight channel under the same channel size and boundary condition, indicating that the application of the spiral channel significantly improves the cooling effect. In addition, the 1D model combined with the second-order response surface model is employed to optimize the channel width, channel height, pitch, and inner wall thickness aiming for the best cooling effect. The calculated maximum temperature of the inner wall after the structure optimization is 586.6 K, which is 29.8% lower than the initial structure before optimization.

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Validation of Conjugate Heat Transfer Model for Rocket Cooling with Supercritical Methane

Cited by 20 publications

References 29 publications

Diameter effect on the heat transfer of supercritical hydrocarbon fuel in horizontal tubes under turbulent conditions

Diameter effect on the heat transfer of supercritical hydrocarbon fuel in horizontal tubes under turbulent conditions

Impact of Ceramic Micropillar Array and Fiber Layer Composite Structure on Kinematic and Heat Transfer Characteristics of Single Droplet Impacting a Wall

Heat Transfer Analysis and Structural Optimization for Spiral Channel Regenerative Cooling Thrust Chamber

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