Proceedings of the Institution of Mechanical Engineers Part G Journal of Aerospace Engineering · 2014 · 28 citations · 17 references
EngineeringAerospace EngineeringAerodynamicsAircraft DesignFluid DynamicsAerodynamic DesignAerodynamic TestingBoundary Layer FlowBoundary-layer TheoryExternal AerodynamicsSupersonic AerodynamicsAir Intake DesignExperimental Intake Flow AnalysisInlet AerodynamicsMass Flow RateMass Flow Rate PerformanceOff-design PerformancePressure RecoveryTotal Pressure
The study focuses on an axisymmetric supersonic mixed‑compression air intake designed for a free‑stream Mach 2.0. The authors aim to evaluate intake performance without boundary‑layer bleed at design and off‑design conditions and to assess how a bleed slot influences performance. Experiments were conducted at Mach 1.8, 2.0, and 2.2 with zero angle of attack, measuring total pressure recovery, mass‑flow ratio, and flow distortion; a bleed slot upstream of the throat, perpendicular to the compression ramp, applied suction through the natural pressure difference between its entrance and exit. Boundary‑layer suction upstream of the throat markedly improves intake performance at both design and off‑design conditions without altering the mass‑flow rate.
The performance of a supersonic mixed compression air intake has been investigated experimentally. The intake is of axisymmetric one and has been designed for a free stream Mach number of 2.0. The present work has two main goals, first to investigate the performance of the intake without boundary layer bleed at design and at off-design conditions and second to study the effects of a bleed slot on the intake performance. The intake has been tested at free stream Mach numbers of 1.8, 2.0, and 2.2 and at zero degrees angle of attack. Total pressure recovery, mass flow ratio, and flow distortion have been selected to assess the intake performance. The bleed slot is located upstream of the intake throat perpendicular to the compression ramp surface. The suction is applied by the natural pressure difference between the entrance and the exit faces of the bleed duct. Results show that applying the boundary layer suction upstream of the intake throat can considerably improve the intake performance at its design and off-design conditions while it does not affect the intake mass flow rate.
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