Embedded Files
Supersonic air-breathing propulsion is characterized by high speed flow, aerodynamic heating, high heat fluxes into the structure, and strong shocks interacting with laminar or turbulent boundary layer leading to shock-boundary layer interactions (SBLI).
The compression ramp forms the basis of intakes in hypersonic air breathing flight vehicles . The supersonic free stream flow is de-accelerated and compressed before it enters the scramjet for combustion. The change in slope at the leading edge of the compression ramp gives rise to flow separation. Shock-boundary layer interactions (SBLI) gives rise to separation and reattachment shock and compression fan.
Shadowgraph of M = 2.9 supersonic turbulent flow over a 25 deg rigid compression ramp. RANS simulation using SST turbulence model.
Static fluid-structure interaction (FSI) simulation. 𝐸/𝜌∞𝑈2 ∞ = 3.18 × 103. Shadowgraph of M = 2.9 supersonic turbulent flow over a 25 deg flexible compression ramp. RANS simulation using SST turbulence model. Flexible ramp is modeled as a hyperelastic solid with a plane strain nonlinear strain-displacement relation.
Mid-point deflection. Dynamic FSI. M = 2.9 turbulent flow over a 25 deg flexible compression ramp. RANS simulation using SST turbulence model. Flexible ramp is modeled as a hyperelastic solid with a plane strain nonlinear strain-displacement relation. There is no flutter instability.
Streamlines over pressure contours
Streamlines over pressure contours
Shadowgraph
Sangeet Sourav Sunderroy, Tumkur Pradeepa Karnick and Kartik Venkatraman (2022). Shock boundary layer interactions in a supersonic flow over a flexible compression ramp in 2022 AIAA Aviation Forum, Chicago, IL, June 27-July 1, 2022. https://doi.org/10.2514/6.2022-4049.
Flutter instability sets-in when the flexible ramp is most flexible using a linear elastic plane stress element at Mach 2.9 and 25 deg wedge angle.
Numerical schlieren of supersonic flow over a flexible 25 deg flexible compression ramp when fluttter instability sets-in.
Sangeet Sourav Sunderroy, Magan Singh, Pradeepa Tumkur Karnick and Kartik Venkatraman (2023). Flutter instability in supersonic flow over a flexible compression ramp. In: 57th 3AF International Conference (AERO2023), Bordeaux, France, March 29-31, 2023.
Page updated
Google Sites
Report abuse