Transpiration Cooling Appllied to C/C Liners of Cryogenic Liquid Rocket Engines

Greuel, Dirk; Herbertz, Armin; Haidn, Oskar; Ortelt, Markus; Hald, Hermann

doi:10.2514/6.2004-3682

Cited by 9 publications

(4 citation statements)

References 4 publications

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“…Figure 16 shows the relationship between solid temperature at the leading edge of strut and coolant flow rates. According to Equation (12), at a certain position, Knudsen number and Reynolds number are approximate to a power function, where the temperature is related to Knudsen number, Since the LTNE model is adopted in the calculation, the influence of mass flow rate on the temperature difference between coolant and solid matrix is studied. Figure 15 shows the temperature difference between fluid and solid inside the strut at the leading edge.…”

Section: Influence Of Coolant Mass Flow Rate On Transpiration Coolingmentioning

confidence: 99%

“…Figure 16 shows the relationship between solid temperature at the leading edge of strut and coolant flow rates. According to Equation (12), at a certain position, Knudsen number and Reynolds number are approximate to a power function, where the temperature is related to Knudsen number, and flow rate is related to Reynolds number. Therefore, the solid temperature and coolant flow rate conforms to the power function, and it can be inferred that further increasing the coolant flow rate will not bring an obvious decrease in solid temperature.…”

Section: Influence Of Coolant Mass Flow Rate On Transpiration Coolingmentioning

confidence: 99%

“…A large number of experimental investigations on transpiration cooling has been conducted [10,11]. Greuel et al [12] experimentally proved that when the blowing rate is less than 0.7%, the transpiration cooling efficiency increases linearly with the increase of coolant. Qian [13] used solid hydrogel as coolant and Wu [14] combined sublimation and transpiration cooling, to improve the cooling effect for porous plates.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation on the Mechanism of Transpiration Cooling for Porous Struts Based on Local Thermal Non-Equilibrium Model

Yang

Bian

et al. 2022

Energies

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Struts as an important structure in the combustion chamber of hypersonic flight vehicles to inject fuel into main flow face a severe thermal environment. Transpiration cooling is considered as a potential method to provide a thermal protection for struts. This paper presents a numerical investigation on transpiration cooling for a strut based on Darcy–Forchheimer model and the local thermal non-equilibrium model and analyzes the mechanism of transpiration cooling. A coolant film and a velocity boundary layer are formed on the strut surface and the shock wave is pushed away from the strut, which can effectively reduce the heat load exerted on the strut. The temperature difference between coolant and solid matrix inside the porous strut is analyzed, a phenomenon is found that the fluid temperature is higher than solid temperature at the leading edge inside the porous strut. As flowing in the porous medium, the coolant absorbs heat from solid matrix, and the fluid temperature is higher than solid temperature at the stagnation point of the strut. The influence of coolant mass flow rate and various coolants on transpiration cooling is studied. As mass flow rate increases, the cooling efficiency becomes higher and the temperature difference between fluid and solid in the porous medium is smaller. The coolant with a lower density and a higher specific heat will form a thicker film on the strut surface and absorbs more heat from solid matrix, which brings a better cooling effect for strut.

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Section: Influence Of Coolant Mass Flow Rate On Transpiration Coolingmentioning

confidence: 99%

“…Figure 16 shows the relationship between solid temperature at the leading edge of strut and coolant flow rates. According to Equation (12), at a certain position, Knudsen number and Reynolds number are approximate to a power function, where the temperature is related to Knudsen number, and flow rate is related to Reynolds number. Therefore, the solid temperature and coolant flow rate conforms to the power function, and it can be inferred that further increasing the coolant flow rate will not bring an obvious decrease in solid temperature.…”

Section: Influence Of Coolant Mass Flow Rate On Transpiration Coolingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation on the Mechanism of Transpiration Cooling for Porous Struts Based on Local Thermal Non-Equilibrium Model

Yang

Bian

et al. 2022

Energies

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show abstract

“…This so-called “air membrane” is capable of separating the surface from the high temperature mainstream flow, inducing a further decrease in the surface temperature and, correspondingly, the improvement of cooling efficiency. Therefore, transpiration cooling has the highest theoretical cooling efficiency [ 1 ] and has shown its importance in various applications [ 2 , 3 , 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Transpiration Cooling Characteristics of Sintered Wire Mesh in Plain Weave

Peng

Luo

et al. 2022

Micromachines

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We experimentally investigate the transpiration cooling characteristics of a porous material, sintered wire mesh. Three samples with different porosities in a plain weave structure are tested with various blowing ratios in an open-loop wind tunnel with a heated mainstream flow. The temperature on the surface of the porous material is measured by an infrared camera to obtain the cooling efficiency. The measurements reveal nonuniform distributions of the surface temperature and the cooling efficiency in both the flow direction and the transverse direction. The averaged cooling efficiency on the surface first decreases and then increases with the blowing ratio, but increases and then decreases with the porosity of the material. The internal cooling by forced convection and its combination with the external film cooling from the transpiration cooling are considered to be attributed to those two cooling characteristics, respectively. Finally, we propose a modified blowing ratio to collapse the minima of the blowing ratio for all tested samples, providing an universal transition for the decreasing and increasing branches for all tested samples in the relation between averaged cooling efficiency and blowing ratio.

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Numerical simulation of transpiration cooling experiments in supersonic flow using OpenFOAM

et al. 2019

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Transpiration Cooling Appllied to C/C Liners of Cryogenic Liquid Rocket Engines

Cited by 9 publications

References 4 publications

Numerical Investigation on the Mechanism of Transpiration Cooling for Porous Struts Based on Local Thermal Non-Equilibrium Model

Numerical Investigation on the Mechanism of Transpiration Cooling for Porous Struts Based on Local Thermal Non-Equilibrium Model

Experimental Investigation on the Transpiration Cooling Characteristics of Sintered Wire Mesh in Plain Weave

Numerical simulation of transpiration cooling experiments in supersonic flow using OpenFOAM

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