Resumo

SANTOS, Wilson F. N.. Simulation of blunt leading edge aerothermodynamics in rarefied hypersonic flow. J. Braz. Soc. Mech. Sci. & Eng. [online]. 2007, vol.29, n.2, pp. 123-135. ISSN 1678-5878.  http://dx.doi.org/10.1590/S1678-58782007000200001.

The steady-state aerodynamic characteristics of a new family of blunted leading edges immersed in a high-speed rarefied air flow are examined by using a Direct Simulation Monte Carlo (DSMC) Method. A very detailed description of the flow properties has been presented separately at the vicinity of the nose and adjacent to the afterbody surface of the leading edges by a numerical method that properly accounts for non-equilibrium effects that arise near the leading edges and that are especially important at high Mach number. Comparisons based on geometry are made between these new blunt configurations and round leading edge. Some significant differences between these leading edges are noted on the flowfield structure and on the aerodynamic surface quantities. It is found that the upstream effects have different influence on velocity, density, pressure and temperature along the stagnation streamline ahead of the leading edges. The analysis also shows that, despite the seeming advantages of the new blunt leading edge shapes, round leading edge still provides smaller stagnation point heating. Nevertheless, round leading edge provides larger total drag than the new blunt shapes under the range of condition investigated.

Palavras-chave : hypersonic flow; rarefied flow; DSMC; blunt leading edge; sharp leading edge.