Results from computational analysis of a mixed compression supersonic inlet

Abstract

P pressure, N/m 2 (psf) p static pressure A numerical study was performed to simulate the critical number flow through a supersonic inlet. This flow field has many R R Gas colGas constant phenomena such as shock waves, strong viscous effects, turRe inlet capture radius, bulent boundary layer development, boundary layer separations and mass flow suction through the walls, (bleed). The 0.4745 m (18.68 in.) TF-30 size computational tools used in this study were two full Navier-0.2116 m ( 8.331 in.) J-85 size

Numerical simulation of HSCT inlet operability with angle of attack

“…Nevertheless, using CFD to accurately simulate the HSCT inlet ow with boundary layer bleed is very challenging. For the NASA VDC inlet which is studied in this paper, Saunders and Keith [3] did the rst CFD simulation with zero angle of attack by using an axisymmetric Navier-Stokes solver. They used two dierent types of bleed boundary conditions.…”

Flow characteristics in boundary-layer bleed slots with plenum

“…Outside of the slot, the solution domain extended 12.2 cm above and 40.9 cm along the flat plate surface. The boundaries AB and CD were located at 28.2 cm upstream and 12.7 cm downstream of the slot's upstream comer to match the locations of experimental velocity profile measurements in reference [6].…”

“…In order to predict the effect of bleed on the boundary layer development and internal shock structure, few investigators [1][2][3] included ramp chambers, throat plenum and exit louvers in their supersonic inlet flow simulations. However, because of the enormous increase in computational time and grid generation complexity, most investigators simulated the global effects of bleed by changing the boundary conditions [4][5][6][7] and/or the turbulence models [8,9] in the bleed regions. The imposed mass flux in the bleed area was based on experimental measurements in some investigations [7] and on empirical correlation of the bleed discharge coefficient in others [4][5][6].…”

“…However, because of the enormous increase in computational time and grid generation complexity, most investigators simulated the global effects of bleed by changing the boundary conditions [4][5][6][7] and/or the turbulence models [8,9] in the bleed regions. The imposed mass flux in the bleed area was based on experimental measurements in some investigations [7] and on empirical correlation of the bleed discharge coefficient in others [4][5][6]. Even when the turbulence model was modified for mass removal at the porous wall [8] the effect of bleed on boundary layer development was not adequately predicted.…”