Experimental evidence of controlled detonation initiation and propagation in a hypersonic flow premixed hydrogen-air is presented. This created facility capable producing Mach 5 hydrogen-air. Flow diagnostics such as high-speed schlieren OH* chemiluminescence results show that flame deflagration-to-detonation transition occurs combined result turbulent acceleration shock-focusing. The experimen...

The receptivity of a hypersonic boundary layer to three-dimensional wall perturbations is investigated in this paper by numerical simulations. The work is motivated by Tumin’s [1] theoretical analysis on the receptivity of compressible boundary layers to three-dimensional wall perturbations with the help of the biorthogonal eigenfunction system. Specifically, receptivity processes of a Mach 5.9...

The effects of rarefaction and nonequilibrium processes on hypersonic rarefied-gas flows over blunt bodies have been studied by the Direct Simulation Monte-Carlo technique (DSMC) and by solving the full Navier-Stokes equations and the equations of a thin viscous shock layer (TVSL) under the conditions of wind-tunnel experiments and hypersonic-vehicle flights at altitudes from 60 to 110 km. The ...

Different types of Large Carbon Cluster (LCC) layers are synthesized by a single-step pyrolysis technique at various ratios of precursor mixture. The aim is to develop a fast responsive and stable thermal gauge based on a LCC layer which has relatively good electrical conduction in order to use it in the hypersonic flow field. The thermoelectric property of the LCC layer has been studied. It is...

We utilize resolvent and weakly nonlinear analyses in combination with direct numerical simulations (DNS) to identify mechanisms for oblique transition a Mach 5 hypersonic flow over an adiabatic slender double-wedge. Even though the laminar separated is globally stable, analysis demonstrates significant amplification of unsteady external disturbances linearized equations. These are introduced u...

Abstract The mixing between the coolant and boundary-layer gas downstream of an injector—for transpiration/film cooling—has been extensively studied for turbulent flows; however, only a handful studies concerning laminar exist, particularly in hypersonic flows. In this paper, concentration at wall heat flux reduction transpiring injector flow are experimentally measured examined. Experiments pe...

Computer simulations have been an effective tool to study transient flow processes in hypersonic flow and have been complementing experimental and theoretical studies to better understand the flow transition process. There have been lots of efforts in code development for high order simulation of nonequilibrium flow but most of the methods are based on shock capturing ideodology. Shock capturin...