Leading edge bluntness effects on the hypersonic flow over the double-wedge at multiple aft-wedge angles
arXiv:2305.16587 · doi:10.1063/5.0149939
Abstract
The present numerical investigation focuses on the leading edge bluntness effects on the double-wedge with varied aft-wedge angles exposed to low enthalpy hypersonic free stream conditions. The bluntness ratio in this study varies, ranging from R/L1 = 0 (sharp leading edge) to R/L1 = 0.577 (maximum allowable bluntness), along with the aft-wedge angle varying between θ2 = 450 and 600. Noticeably, even a small bluntness ratio can completely change the shock interaction pattern compared to its sharp geometrical counterpart due to a detached leading edge shock, enlarged separation bubble, and location of various shock-waves concerning it. Critical bluntness ratios exist for the low aft-wedge θ2 = 450 angle, but increasing the aft-wedge angle makes the flow field highly unsteady for some bluntness ratios. Nevertheless, these bluntness ratios for such double-wedge configurations are reported using the mean of separation bubble size. Moreover, this work unravels the cause of such unsteadiness for the unsteady flow-fields using the spatial-temporal evolution of the wall pressure distribution, Fast Fourier Transform (FFT) of the pressure fluctuation signal at the compression corner and supports the deduced observation with the help of energy-based Proper Orthogonal Decomposition (POD). The increased shock-boundary layer interaction strength moves the separation point upstream beyond the junction of cylindrical bluntness and inclined fore-wedge surface, accompanying sudden change in its direction of motion that perturb the shear layer that set to a self-sustained, highly unsteady flow field.
References in corpus (12)
- Investigation of Mixing Characteristics in Strut Injectors using Modal Decomposition
- Suppression of vortex shedding using a slit through the circular cylinder at low Reynolds number
- Role of Jet Spacing and Strut Geometry on the formation of Large Scale Structures & Mixing Characteristics
- Role of corner flow separation in unsteady dynamics of hypersonic flow over a double wedge geometry
- Characterization of turbulent supersonic flow over a backward facing step through POD
- Numerical Investigation of Flow Structures Around a Cylindrical Afterbody Under Supersonic Condition
- Numerical study of flow physics in supersonic base-flow with mass bleed
- Investigation of Shock Wave Interactions involving Stationary and Moving Wedges
- Investigation of flow structures in a turbulent separating flow using hybrid RANS-LES model
- Flow Characteristics of Elastically Mounted Slit Cylinder at Sub-critical Reynolds Number
- Effect of vortex and entropy sources in sound generation for compressible cavity flow
- Numerical Study of Trailing and Leading Vortex Dynamics in a Forced Jet with Coflow