A numerical investigation of supersonic jet interaction for finned bodies

Abstract

A detailed numerical investigation of the interaction between a lateral jet and the external flow has been performed for a variety of missile body geometries. These include non-finned axisymmetrical bodies and finned bodies with either strakes or aft-mounted tail fins. The computations were performed at Mach numbers 2, 4.5, and 8. To obtain the numerical results, both Reynolds-averaged Navier-Stokes and Euler techniques were applied. The computational results were compared with results from a previously published wind tunnel study that consisted primarily of global force and moment measurements. The results show significant interactions of the jet-induced flow field with the fin surfaces, which produce additional effects compared with the body alone. In agreement with the wind tunnel study, in some cases the presence of lifting surfaces resulted in force and/or moment amplification of the jet interaction with the missile surfaces. The results indicate deamplification of the jet force at Mach 2 for all three bodies. Amplification of the jet force was also observed for high Mach numbers, particularly for the body with strakes. For the results examined here, there were only minor differences in the global force and moment predictions when viscous or inviscid techniques were used. The dependence of the interaction parameters on angle of attack and jet pressure was well predicted by both methods. The numerical techniques showed good agreement with the experiments at supersonic Mach numbers but only fair agreement for the hypersonic, Mach = 8 case.

Analysis of the Interaction Between Side Jet and Supersonic Free Stream Using K-factor

“…1b에 [4] , 전산유체역학의 발전에 따라 실험적 결과에 해석적인 방법을 보완하 여 마하 수의 영향, 받음각 및 제트 압력의 영향 등에 대하여 활발히 수행되고 있다 [3～10] . 최근에는 동체 효 과와 조종 날개 효과를 구분하여 해석하기도 하고 [7] , 제트에 의한 후방 와류 흐름 영향 [8] , 제트와 외부 대 기의 화학적 반응에 의한 영향 [9] , 및 뜨거운 제트 흐 름에 따른 영향 [10] 까지도 고려하여 상호 작용 현상에 [11] . 상호작용 계수가 음수이면 측추력 방향과 반대방향의 추력발생을 의미한다.…”

Development of mechanical guidance actuators for a supersonic projectile

“…Several recent research efforts on manoeuvring projectiles such as the UK HOTLiP program (12) and Army Research Lab efforts have also been numerical in nature. Graham and Weinacht validated their numerical scheme to predict a control jet interaction (13) and then used their method to examine the case of a finned projectile with control jets (14) . They demonstrated that there were significant interactions that could increase the aerodynamic pitching moments relative to the jet thrust alone.…”

Unsteady Aerodynamic Simulations of a Finned Projectile at a Supersonic Speed with Jet Interaction

“…Examples of experimental and numerical studies of lateral jet interaction on a finned projectile include both steady-state jets and transient pulse jets. [22][23][24][25]26 Recently, time-accurate CFD was used in the case of a pulse jet. 27 The present work offers an alternate approach and takes into account precisely the jet interaction effect as would be seen in actual flight.…”