Study on the characteristics of interaction flowfields induced by supersonic multi-jets

Transverse jet technology has been applied to many aircrafts as an effective way of attitudecontrol. It can provide thrust more rapidly and is affected by less flight conditions thanconventional aerodynamic surface control. Therefore, the maneuverability of the aircraft isenhanced. And less aerodynamic surfaces are needed, thereby the weight is reduced and the stealthperformance is improved. Recently, the method of jet attitude control is paid more and moreattentions.When a sonic or supersonic jet is injected laterally into supersonic or hypersonic free stream,the complex jet interactive flowfields is generated which involves complex flow structures such asshock/boundary layer interaction, multi-shocks interaction, flow separation vortices, and flowreattachment, etc. Although considerable investigations have been carried out for nearly half acentury, but there are many issues unresolved until now in understanding the flowfieldscharacteristics and flowing mechanism.The characteristics of the interaction flowfields induced by lateral supersonic single/multijets mounted longitudinally on the revolution body had been studied by numerical simulation inthis paper. The three dimensional compressible laminar N-S equations were solved by finitevolume method with Roe's two-order spatial scheme and multi-block structure grid. The methodwas validated qualitatively and quantitatively by experimental schlieren photo about theshockwaves showed in three jets interaction flowfields. The spatial structures of single/multi jetsinteraction flowfields and separation regions induced by shockwave/boundary layer interactionwere described in this paper. Four cases including single jet, twin jets, triple jets and five jetsinteraction flowfields had been simulated numerically and analyzed. It is shown that the influencesof the first jet on the structure and separation region of interaction flowfields upstream of the jetswas dominant.