Design High Temperature Cored Brick Heater for Hypersonic Wind Tunnel

One of the throats in designing hypersonic wind tunnel is the design of heater. The purpose of this study is designing a heater with ceramic cored, in 1800K temperature for preventing air condensation in wind tunnel. In initial part of design the fluid flow and heat transfer equation have been solved through an inviscid engineering code. This code estimates the temperature of transient outlet flow with static physical and thermodynamic properties of fluid and solid, geometrical dimensions of bed and wall distribution temperature. The final part of design has been solved with computational methods and using of Navir Stocks and energy equation, with K-ω SST turbulence model. The solver is 2nd order and pressure base. The numerical results are in acceptable agreement with experimental. By parameter analysis, various design for obtaining a suitable heater have been evaluated. The evaluated parameters are height, diameter, porosity of the bed and the diameter of the hole and diameter of the bed. The results show that the diameter of the hole, the diameter of the bed, the height and prosity the most important parameters in the design of the heating bed and have a great impact on the temperature of the exhaust air and the duration the test respectively. 14% increase or decrease of each parameter increase 61, 51, 28, and 8% of execution time and 6, 3, 2 and 1.8 % of the output air temperature respectively. The hole diameter and prosity of the heater bed are two important parameters in determining the dimension of the heater bed. Finally with using of the results the final design has been modified with bed diameter of 0.45 meter, height of 1.7 meter, hole diameter of 3 millimeter and prosity 0.2512.