Abstract
Turbulent flow in a mixed compression intake is investigated. The unsteady compressible Navier–Stokes equations are solved using a stabilized finite element method with 6-noded triangular element. The Spalart–Allmaras model is used for turbulence closure. For comparison, the laminar flow is studied as well. A bleed of 6 % is utilized to overcome the start-up problem of the intake. The effect of back pressure on the performance of the intake is studied via the total pressure recovery and distortion index. Total pressure recovery is relatively lower while distortion index is higher for turbulent flow compared to laminar flow. The critical back pressure ratio, for unstart of the intake, for turbulent flow is higher compared to laminar flow. The effect of bleed on the performance of the intake is studied.
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