Transient heat dissipation performances of transpiration cooling with coolant phase change

Wang, Meng; Wang, Jianhua; Pu, Jian; He, Fei

doi:10.1016/j.icheatmasstransfer.2022.106082

Cited by 6 publications

(2 citation statements)

References 19 publications

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“…In order to simulate this process, the DHSV-bio-FS made of flexible materials was used to mimic human skin inside which the microchannels simulating the capillary pipe were prepared, and pumps were used to simulate the sudoriferous glands. Under general circumstances, liquid water is a preferred coolant due to its high specific heat and latent heat of phase transition [ 36 , 37 ].…”

Section: Methodsmentioning

confidence: 99%

Thermal Protection Performance of Biomimetic Flexible Skin for Deformable High-Speed Vehicles (DHSV-bio-FS) under Uniaxial Tensile Strain

Yuan,

Lü,

Bao

2024

Research

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Vehicle skin is the key component in maintaining the aerodynamic shape of the vehicle. A deformable high-speed vehicle needs to adjust its shape in real time to realize optimum aerodynamic efficiency and to withstand extreme heat flow induced by high-speed flight, which requires the skin to possess large strain and high-temperature resistance. Traditional vehicle skin cannot satisfy both of the requirements. Biomimetic flexible skin for deformable high-speed vehicles (DHSV-bio-FS) combines flexible material fabrication with transpiration cooling technology, which can simulate human skin sweat cooling, and has the characteristics of large strain and high-temperature resistance. The thermal protection performance of the prepared prototype of DHSV-bio-FS was evaluated by simulation and wind tunnel experiments at 40% tensile strain with liquid water as coolant. Simulation results suggest that the surface temperature of the DHSV-bio-FS at 40% tensile strain is consistent with the temperature of the coolant (350 K) in a 3,000 K high-temperature gas environment. In addition, the prepared prototype DHSV-bio-FS survived for 1,200 s in a high-temperature gas environment of 200 kW/m 2 in wind tunnel experiments. This paper verifies the reliability of DHSV-bio-FS in a high-temperature gas environment and can be deployed in applications of flexible skin for deformable high-speed vehicles (DHSV-FS).

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Section: Methodsmentioning

confidence: 99%

Thermal Protection Performance of Biomimetic Flexible Skin for Deformable High-Speed Vehicles (DHSV-bio-FS) under Uniaxial Tensile Strain

Yuan,

Lü,

Bao

2024

Research

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“…Researchers like Wang [17] and He [18] established SPMs to study the effects of different heat fluxes and coolant mass fluxes on physical quantities such as temperature, pressure and phase saturation in porous media flat plates. Wang et al [19] employed a SPM to investigate the response of internal gas-liquid phase change to time-varying boundary heat flux and pressure. This kind of model reserves most of the flow information, however, it has higher computation complexity and computing load.…”

Section: Introductionmentioning

confidence: 99%

A modified local thermal non-equilibrium model of transient phase-change transpiration cooling for hypersonic thermal protection

Jin,

Zhao,

Yao

et al. 2024

Adv. Aerodyn.

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Aiming to efficiently simulate the transient process of transpiration cooling with phase change and reveal the convection mechanism between fluid and porous media particles in a continuum scale, a new two-phase mixture model is developed by incorporating the local thermal non-equilibrium effect. Considering the low-pressure and high overload working conditions of hypersonic flying, the heat and mass transfer induced by capillary and inertial body forces are analyzed for sub-cooled, saturated and super-heated states of water coolant under varying saturation pressures. After the validation of the model, transient simulations for different external factors, including spatially-varied heat flux, coolant mass flux, time-dependent external pressure and aircraft acceleration are conducted. The results show that the vapor blockage patterns at the outlet are highly dependent on the injection mass flux value and the external pressure, and the reduced saturation temperature at low external pressure leads to early boiling off and vapor blockage. The motion of flying has a large influence on the cooling effect, as the inertial force could change the flow pattern of the fluid inside significantly. The comparison of the results from 2-D and 3-D simulations suggests that 3-D simulation shall be conducted for practical application of transpiration cooling, as the thermal protection efficiency may be overestimated by the 2-D results due to the assumption of an infinite width length of the porous plate.

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Investigation on the effectiveness of transpiration cooling under the influence of shock wave

Liu,

Bian,

Zhou

et al. 2024

Applied Thermal Engineering

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Transient heat dissipation performances of transpiration cooling with coolant phase change

Cited by 6 publications

References 19 publications

Thermal Protection Performance of Biomimetic Flexible Skin for Deformable High-Speed Vehicles (DHSV-bio-FS) under Uniaxial Tensile Strain

Thermal Protection Performance of Biomimetic Flexible Skin for Deformable High-Speed Vehicles (DHSV-bio-FS) under Uniaxial Tensile Strain

A modified local thermal non-equilibrium model of transient phase-change transpiration cooling for hypersonic thermal protection

Investigation on the effectiveness of transpiration cooling under the influence of shock wave

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