A5022456110- Gas Dynamics and Kinetic Theory
- Computational Fluid Dynamics and Aerodynamics
- Aeroelasticity and Vibration Control
- Rocket and propulsion systems research
- Fluid Dynamics and Turbulent Flows
- Composite Structure Analysis and Optimization
- High Entropy Alloys Studies
- Biomimetic flight and propulsion mechanisms
- Advanced machining processes and optimization
- Diamond and Carbon-based Materials Research
- Combustion and flame dynamics
- Laser and Thermal Forming Techniques
- Welding Techniques and Residual Stresses
- Particle Dynamics in Fluid Flows
- Catalytic Processes in Materials Science
- Microstructure and Mechanical Properties of Steels
- Laser Material Processing Techniques
- High-Temperature Coating Behaviors
- Mechanical Engineering and Vibrations Research
- Topology Optimization in Engineering
- Fluid Dynamics and Vibration Analysis
- Metal Alloys Wear and Properties
- Plasma and Flow Control in Aerodynamics
- Engineering Applied Research
- Advanced Surface Polishing Techniques
Kangwon National University
2024
Sejong University
2021-2023
Korea Advanced Institute of Science and Technology
1989-2020
Middle East Technical University
2015-2017
Pohang University of Science and Technology
2007-2008
Materials Science & Engineering
2008
Materials Technology (United Kingdom)
2008
The interaction between the self-excited shock train flow and cavity shear layer in a scramjet isolator is investigated numerically using detached-eddy simulations. effect of changing position by controlling back pressure ratio front wall angle are analyzed unsteady statistics modal analysis. propagation mechanism disturbance was spatiotemporal cross-correlation coefficient In present numerical study, constant section with (θ = 90° 60°) considered, followed diffuser simulated at Mach number...
The self-excited shock train oscillation control using partial removal of boundary layer flow in a constant area duct is studied numerically unsteady Reynolds Averaged Navier–Stokes simulation. effect varying the suction ratio on oscillatory characteristics analyzed steady and statistics, space–time contour, power spectra, cross correlation analysis. For present study, height 0.032 mm, aspect 25, at freestream Mach number 2.0 back pressure 0.52 considered. through an angled slot with three...
The transient thermal stress and residual in bead-on-plate welding laser surface hardening was analysed by employing a new two-dimensional finite element model. In the formulation, sliced solution domain possessing one or direction introduced to allow change of longitudinal total strain along width depth specimen. strain, which makes resultant force zero, used as boundary condition. To determine equations compatibility, equilibrium moment were considered. Calculation temperature distribution...
An equilibrium constant is an important parameter in regard to determining the backward reaction rate chemical kinetics modeling for a hypersonic flow. Three common approaches determination are based on partition function, Gibbs free energy, and experimental measurement. The present study conducted computational fluid dynamics (CFD) analysis with different formulations thermochemical nonequilibrium flow order influence of carbon dioxide during Martian entry. molecule dissociation differs...
The idea of morphing is drawing extensive attention in aerospace technologies. Several different approaches like span, camber, twist, and sweep are finding applications. In this work, the concept a trailing edge control surface which capable performing decamber explained. upper lower parts undergo chordwise elongations difference between these displacements gives rise to either camber or morphing. necessary force achieved by help servo actuators. During design, structural analyses were done...
Wall partial pressure dependence analysis of oxygen surface catalytic recombination efficiency on copper-coated is experimentally performed in a shock tube at room temperature. Three flow conditions with different enthalpy gas mixture that contains 21% and 79% argon are considered. The determined based the stagnation heat transfer measurement end-wall tube. A platinum thin-film gauge used to determine total transfer. An additional silicon dioxide-coated thin film applied measure conductive...
The effect of the surface catalycity on effective radius a blunt body geometry in hypersonic flow is numerically investigated. defined terms with variation both nose and corner radius. Five different types configurations are considered, that range from flat-faced to complete hemisphere geometry. chosen investigated for four conditions levels enthalpy. obtained by comparing stagnation heat transfer spherical To compute given configuration, two-dimensional computational fluid dynamics (CFD)...
In this article, the design and analysis of a hybrid trailing edge control surface an unmanned aerial vehicle are presented. The structural was performed to increase decrease camber match selected airfoil profiles. first analyzed with help finite element method assess morphing capability. morphed then aerodynamically comparisons original target profiles were made. According aerodynamic analyses, it concluded that can successfully morph into very minor changes in values while still ensuring...
Purpose The Fay and Riddell (F–R) formula is an empirical equation for estimating the stagnation-point heat flux on noncatalytic fully catalytic surfaces, based assumption of equilibrium. Because its simplicity, F–R has been used extensively reentry flight design as well ground test facility applications. This study aims to investigate uncertainties F-R by considering velocity gradient, chemical species at boundary layer edge, thermochemical nonequilibrium (NEQ) behind shock under various...