scholarly journals Plenum Pressure Behavior in Transiently Heat Loaded Transpiration Cooling System

2020 ◽  
pp. 1-12
Author(s):  
Fabian Hufgard ◽  
Stefan Loehle ◽  
Matthew McGilvray ◽  
Tobias Hermann ◽  
Sven Schweikert ◽  
...  
Keyword(s):  
Cooling System ◽  
Transpiration Cooling ◽  
Pressure Behavior ◽  
Plenum Pressure

scholarly journals Effects of Coolants of Double Layer Transpiration Cooling System in the Leading Edge of a Hypersonic Vehicle

2021 ◽  
Vol 9 ◽  
Author(s):  
Shibin Luo ◽  
Zhichao Miao ◽  
Jian Liu ◽  
Jiawen Song ◽  
Wenxiong Xi ◽  
...  
Keyword(s):  
Porous Media ◽  
Heat Conduction ◽  
Double Layer ◽  
Cooling System ◽  
Convection Heat Transfer ◽  
Leading Edge ◽  
Hypersonic Vehicle ◽  
Transpiration Cooling ◽  
Stagnation Region ◽  
Operation Conditions

As a promising and efficient active cooling method, double layer transpiration cooling is introduced into the design of the cooling system in the leading edge of a hypersonic vehicle. The physical model is built combined with hypersonic transpiration cooling, film cooling, heat conduction, porous media heat conduction and convection heat transfer. In addition, effects of different kinds of coolants are considered to reveal cooling mechanisms in different operation conditions. A comprehensive turbulence model validation and mesh independence study are provided. Flow characteristics caused by flow impingement, separation, transition and interaction with the cooling flows are displayed and analyzed in the work. When different kinds of coolants supplied at the same mass flow rate, the coolants with low densities, i.e., H2 and He, have the lowest peak temperature compared with the coolants with large densities, i.e., N2 and CO2. The coolants with low densities have a large ejecting velocity which provides large kinetic energy to penetrate deeply in the porous media. In addition, when the ejecting velocity is large enough, a recirculation is formed in front of the leading edge and pushes the high temperature region located in stagnation region away from the leading edge. However, when the coolants are ejected at the same velocity, the coolants with large densities exhibit better cooling performance.

Energy Balance in Al-Co Open-Celled Foam of Transpiration Cooling

2014 ◽  
Vol 575 ◽  
pp. 41-45 ◽  
Author(s):  
Bundit Krittacom ◽  
Pipatana Amatachaya ◽  
Ratipat Sangchot
Keyword(s):  
Heat Transfer ◽  
Energy Balance ◽  
Cooling System ◽  
Solid Phase ◽  
Porous Plate ◽  
Heat Radiation ◽  
Transpiration Cooling ◽  
One Dimensional ◽  
Energy Of Interaction ◽  
Two Phases

Numerical model of one-dimensional steady-state on Alumina-Cordierite (Al-Co) open-celled foam using in transpiration cooling system have been conducted to investigate the local energy balance (LEB) of gas and solid phase within porous plate. Physical properties, i.e., porosity (f), pores per inch (PPI) and thickness (x), of Al-Co open-cellular porous material were 0.87, 13 and 0.103 m, respectively. Two equations of the conservative energy consisting of the gas and solid phase were analyzed. From study, it was found that heat convection (HVF) balanced with heat transfer between two phases/ energy of interaction (INT) for the gas phase case. In the solid phase, heat transfer between two phases (INT) tended to offset heat radiation (HRS). Remarkably, heat conduction of both phases (HDF and HDS) was not effected to the present cooling system. Thus, characteristic of fluid flow effecting by HVF and heat transfer governed from HRS was strongly efficient to transpiration cooling system.

Properties and Application of Oriented Porous SiC as Transpiration Cooling Materials

2007 ◽  
Vol 336-338 ◽  
pp. 1109-1112 ◽  
Author(s):  
Jie Tang ◽  
Yu Feng Chen ◽  
Ji Guo Sun ◽  
Hua Wang ◽  
Hai Lin Liu ◽  
...  
Keyword(s):  
Pore Structure ◽  
Pore Size ◽  
Cooling System ◽  
Casting Process ◽  
Solid Loading ◽  
Transpiration Cooling ◽  
Rocket Engines ◽  
Intrinsic Permeability ◽  
Sic Ceramics ◽  
Porous Sic

This paper describes the fabrication of porous reaction-bonded SiC ceramics with radial directed pores and the application of these materials to transpiration cooling system of rocket engines. A special mold is designed for freeze-casting process to prepare SiC cylinders with radial directed pores. Green bodies with well-oriented pore structure are obtained from slurry with solid loading up to 47vol%. The pore size is in the level of several tens micron. Green bodies with various porosities are infiltrated with different amount of liquid Si. The intrinsic permeability of each sample is measured with air as flowing media. It is concluded that permeability has relationship with not only the porosity but also the pore structure of samples.

Gas-Bubble Dynamics with Unstable Operation of a Transpiration Cooling System

2002 ◽  
Vol 33 (5-6) ◽  
pp. 8
Author(s):  
B. V. Kichatov ◽  
V. M. Polyaev ◽  
S. V. Runovskii
Keyword(s):  
Bubble Dynamics ◽  
Cooling System ◽  
Transpiration Cooling ◽  
Gas Bubble

Control of transpiration cooling system and its characteristics

1993 ◽  
Vol 14 (11) ◽  
pp. 1047-1056 ◽  
Author(s):  
Xu Yan-hou ◽  
Yang Xue-shi
Keyword(s):  
Cooling System ◽  
Transpiration Cooling
Sign in / Sign up

Export Citation Format

Share Document