Experimental Investigation of Shear-Layer/Body Interactions in TSTO at Hypersonic Speeds

This paper presents experimental results of unsteady aerodynamic interactions including Shock/Shock Interaction (SSI) and Shock/Boundary Layer Interaction (SBLI) between two bodies at hypersonic speed. These interactions can be seen in space vehicles consisting of multi-bodies, such as a TSTO, or at a scramjet engine inlet. The present study considers the effect of a flat plate below the SSI where a boundary-layer is developed on the plate surface. More specifically, the interacted flow for a combination of a flat plate (FP) and a hemi-circular cylinder (HCC) is examined at a hypersonic speed (M 1 ¼ 8:1); the distributions of surface pressure and heat transfer rate are measured. To obtain various SSI patterns, the clearance between two bodies (FP and HCC) is changed. Results show that unsteadiness at the SSI point causes a feedback loop between the two bodies; a jet flow impinges on the FP, the effect of which propagates upstream where the jet impinges on the FP, and the aerodynamic and aerothermodynamic loads reach their maxima. Finally, we found that the feedback loop can be destroyed by installing a fence on the FP to reduce unsteadiness of flow field.

show abstract

“…These results could be applied to practical designs of future space transportation systems, such as Orion and TSTO. 4,5,12,17) …”

Section: Discussionmentioning

confidence: 99%

“…In addition, this paper compares detailed analyses and new results with our previous paper. 12) 2. Experimental Setup…”

Section: Introductionmentioning

confidence: 99%

Unsteady Aerodynamic Interaction between Two Bodies at Hypersonic Speed

Ozawa

Kitamura

Hanai

et al. 2010

Trans. Japan Soc. Aero. S Sci.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The existing research on the two-body separation problem mainly focuses on theoretical methods and discrete working conditions, but there are few studies on the separation process under different initial conditions. OZAWA [8] et al changed the clearance between the two bodies in the wind tunnel test and found that there is a critical clearance, which changes the stable and unstable states of the aerodynamic interaction flow field; Jiang [9] et al carried out wind tunnel tests and numerical simulations for the spatial separation problem, indicating that the inter-stage separation problem requires further refinement of the existing flow field aerodynamic phenomena; Gan [10] et al conducted wind tunnel tests to study the aerodynamic disturbance problem when the two body models are separated in the air, and attributed the aerodynamic disturbance of the separated flow field to three forms according to the relative positions of the two bodies; Wang [11] et al investigated the static and dynamic three-dimensional flow field of the TSTO under different lifting angles and summarized characteristics of the disturbance flow field under different lifting angles. At present, there are more static studies in the two-body separation problem, but less studies on the dynamic process of the motion state, so it is necessary to strengthen the study of the two-body dynamic separation process.…”

Section: Introductionmentioning

confidence: 99%

Study on Influencing Factors of Two-Body Parallel Separation

Zhao,

Yang,

Jiang

et al. 2024

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

In the parallel separation process of two bodies, the initial velocity state and the surrounding flow field environment jointly determine the motion state of the two bodies, which is a direct determinant of the separation process safety. To study the two-body parallel separation process and the influencing factors, this paper adopts the dynamic mesh technique and finite volume method to solve the Navier-Stokes equations and study the influence of the initial separation clearance and velocity state on the separation process. The results show that: with the increase of the initial separation clearance, the separation process safety of two bodies under the action of complex flow field may decrease; the effect is poor when the two bodies are separated at rest, and a suitable initial velocity state is beneficial to improve the separation safety to achieve the purpose of safe separation, and the two bodies show different separation processes under different initial velocity states.

show abstract