PHYSICAL INSIGHT INTO SCRAMJET INLET BEHAVIOUR VIA MULTI-OBJECTIVE DESIGN OPTIMISATION

摘要

Scramjet propulsion is a promising technologyrnfor reliable and economical access to space andrnhigh-speed atmospheric transport. The inletrnplays a key role in determining the performancernof scramjets, in particular for the axisymmetricrnclass of scramjet engines that are currently exploredrndue to their advantages in numerous aspects.rnIn the present study a multi-objectiverndesign optimisation (MDO) has been conductedrnwith respect to four major inlet design criteria:rncompression efficiency, drag, adverse pressurerngradient, and exit temperature. The former threerncriteria are used as the objective functions and thernlast as the constraint function to evaluate the inletrnflowfields in the state-of-the-art coupled CFDrn/ MDO approach. The influential parameters andrnkey physics have been identified by scrutinisingrnthe flowfields that have been obtained as an outcomernof the optimisation.