Compiling the RN dimensionless number to determine the boundary between aerothermodynamics and radiation heating for ablative noses

Authors

1 Department of Mechanic- Energy Conversion Engineering, Azad University, West Tehran, Iran.

2 Faculty of Aerospace, Malek Ashtar University of Technology, Iran.

3 Department of Mechanic Engineering, Azad University, West Tehran, Iran.

Abstract

The abstract should be written with 100 to 200 words (Times New Roman 9). The most complete method to calculate aerothermodynamics and radiation heating applied to the walls of the hypersonic destructible is simultaneous solution of flow equations, chemical reaction kinetics, combustion model in the destructible layer, radiation models and flow turbulence. Using this algorithm over time requires a high amount of computing memory. Due to the high solution time, the users of this code do not consider it reasonable to use it for preliminary design purposes. Therefore, the aim of this research is to compile the dimensionless number RN by using the results of CTCA code and Buckingham's method to determine the boundary between aerothermodynamics and radiation heating in order to reduce the solution time related to CTCA code, so that in RN smaller than 1.0, it is possible to calculate the heating ignore radiation versus aerothermodynamics heating and disable the subroutine related to radiation heating, and also in RN greater than 2.0, you can ignore aerothermodynamics heating versus radiation heating and disable the subroutine related to aerothermodynamics heating. By considering these changes on CTCA code, its solution time for a nose with a typical flight envelope was reduced by 15%, the maximum amount of error in the total heat flux compared to CTCA code was less than 2%. It should be noted that in the1≤RN≤2, the effects of aerothermodynamics and radiation heating should be considered simultaneously and the relevant subroutines in CTCA code should be activated.

Keywords

Main Subjects

References

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Journal of Solid and Fluid Mechanics
Volume 14, Issue 1
March and April 2024
Pages 127-138

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