Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
NUMERICAL ANALYSIS OF THE LEADING-EDGE BLUNTNESS EFFECT AND ISOLATOR HEIGHT ON A SCRAMJET INLET
Submission Author:
João Vitor Siqueira , SP
Co-Authors:
João Vitor Siqueira, MAURICIO ROSA, Guilherme Borges Ribeiro
Presenter: Guilherme Borges Ribeiro
doi://10.26678/ABCM.COBEM2019.COB2019-0116
Abstract
Airbreathing hypersonic vehicles can be powered by scramjet (supersonic combustion ramjet) engines, whose inlet requires blunt leading edges in order to overcome the high heat fluxes that are inherent of hypersonic flights. Thus, this work has the purpose of evaluating, through detailed bi-dimensional computational fluid dynamics (CFD) analyses, the influence of the leading-edge bluntness and isolator height on the airflow of a scramjet intake. Results showed that bluntness has the negative effect of increasing the boundary layer separation (BLS) region in the first wedge which is compensated with the positive ones of reducing the high heat flux peak on the reattachment point and the pressure on the second wedge. Both, leading-edge bluntness and isolator height performed great influence on the intake airflow structure. The isolator height, by its turn, had a major effect on the flow separation at the isolator entrance yielding a bubble that increases with the isolator height, although the air mass flow inside the isolator is not much affected. In some circumstances, these shock-wave/boundary-layer interaction (SWBLI) may lead the engine to an unstart condition in which the airflow in the isolator is no proper for scramjet operation.
Keywords
hypersonics, CFD, Scramjet, Bluntness
