4:00 p.m.-5:00 p.m.
2164 Martin Hall, DeWalt Seminar Room/Hybrid
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TITLE: Transpiration Cooling of a Hypersonic Vehicle
ABSTRACT: Unlike commercial aircraft, today’s rockets are not fully reusable. The cost of space travel is therefore astronomically high, making it inaccessible to the public. Rockets are hypersonic vehicles, i.e. vehicles that fly faster than five times the speed of sound. Hypersonic vehicles face tremendous heat due to aerodynamic heating (heating by air friction). Temperatures around the vehicle could go beyond 10,000 °C — far above the melting point of any known material. Today’s rockets therefore have a heat shield that gets damaged as they reenter Earth’s atmosphere. Such heat shields are not reusable. A promising technology that could increase the degree of reusability of rockets — or envisaged hypersonic passenger jets — is transpiration cooling. This is a method where a cooling gas is injected through a porous material, which creates an insulating blanket around the vehicle and thereby protects the surface underneath from heat and oxidation. However, this blanket diminishes downstream as it mixes with the fast, hot gas flowing around the vehicle. The physics of this mixing must be known to determine how much coolant is required for a mission. In this talk, Dr Ifti will present the key findings from his doctoral work on this topic. An analytical model — first of its kind reported in the open literature — to predict the mixing between the boundary-layer and coolant gasses in a laminar, hypersonic flow will be presented. The analytical model has been substantiated by data obtained from transpiration cooling experiments conducted at Mach 7 in the Oxford High Density Tunnel. The talk will further include the qualification of a novel porous material — made of an Ultra-High-Temperature Ceramic (UHTC) with a melting point above 3000 K — for the purpose of transpiration cooling.
BIO: Dr. Ifti joined the High-Speed Aerodynamics and Propulsion Laboratory (HAPL) at the University of Maryland as a Postdoctoral Associate in April 2022. Originally from Mymensingh, Bangladesh, he earned his DPhil in Engineering Science (Hypersonics) from the University of Oxford in the United Kingdom. For the scientific contributions in his doctoral thesis entitle, “Transpiration Cooling of a Hypersonic Vehicle,” he won the 2022 UK Doctoral Researcher Award (2nd Prize in Engineering category), in a UK-wide academic competition that is awarded annually to junior researchers with promise to be amongst the world class academics of the future. Dr Ifti holds bachelor’s and master’s degrees in Aerospace Engineering from the University of Stuttgart, Germany.
ZOOM DETAILS: https://umd.zoom.us/j/2226271754?pwd=RWhyUnUxMG1Hc2IvcHJMTWwrWXpodz09
This Event is For: All Students • Graduate • Undergraduate • Faculty • Staff