Search

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Numerical method for predicting the aero-heating environment of hypersonic vehicles with catalytic surface is developed by solving the multispecies chemical nonequilibrium Navier-Stokes equations. A catalytic-efficiency-based finite-rate catalytic boundary condition including ionic species is proposed to model the surface catalysis. Then numerical simulations with different surface catalytic efficiencies of a reentry capsule are conducted to investigate the influence of finite-rate surface catalysis on aero heating. Results show that the surface catalytic efficiency plays a significant role in aero-heating, and low catalytic efficiency material should be adopted to ease the aero-heating environment. Compared with the convective heat flux, the cliff usi ve heat flux is more sensitive to the catalytic efficiency, and is the main mechanism of the nonlinear increase in aero-heating. Beside the surface catalytic efficiency, the influence of surface catalysis on aero-heating also depends on the local flow characteristics, such as degree of dissociation and ionization, surface density, temperature, and so on. [ABSTRACT FROM AUTHOR]