Results 111 to 120 of about 4,954 (163)
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The Transpiration-Cooled Gas Turbine
Journal of Engineering for Power, 1970This paper describes a program of experimental and analytical research designed to evaluate the aerodynamic and thermodynamic performance of transpiration-cooled porous surfaces in the high-temperature gas turbine. The aerodynamic penalties of effusing coolant through a set of nozzle blades are shown to be small, particularly when compared with the ...
F. J. Bayley, A. B. Turner
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TRANSPIRATION COOLING WITH LIQUID METALS
AIAA Journal, 1963The development of hybrid propulsion concepts at the Naval Ordnance Test Station has created the requirement for a lightweight nozzle system capable of withstanding gas temperatures in excess of 6200°F for burn times longer than 30 sec. A series of 40 nozzle-material test firings illustrated that tungsten nozzle insert systems provided the best ...
R. L. MCALEXANDER +3 more
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Towards Prediction of Transpiration Cooling
48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, 2010The objective of this work is to develop a simulation procedure for prediction of micro thermo-fluid transport through porous materials. Emphasis is placed on the prediction and optimization of the heat transfer process in the Knudsen number range wherein the continuum slip-flow hypothesis is valid. We developed herein a large-scale simulation code for
Steingrimsson, A. +3 more
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Transpiration cooling with bio-inspired structured surfaces
Bioinspiration & Biomimetics, 2020Transpiration cooling is considered to be one of the most effective cooling methods for protecting components from ablation in extremely high temperature environments, so improving transpiration cooling efficiency is quite useful in practical applications. Living creatures always have the optimal properties for cooling after long-term evolution.
Gan Huang +4 more
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Thermal Effects on a Transpiration Cooled Hemisphere
Journal of the Aerospace Sciences, 1962An approximate method is used to obtain the injec tion distribution which would exist on an isothermal, transpiration-cooled hemisphere in a supersonic stream. This distribution is the same for both air and helium injection, and is independent of the blowing level.
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Transpiration Cooling Methods for the SpaceLiner
2008At the Space Launcher System Analysis (SART) department of DLR-Cologne, a hypersonic spaceplane for passenger transportation is being investigated. The spaceplane is called the “SpaceLiner”. The vehicle performs its rocket powered, intercontinental flight via a suborbital trajectory. The major challenge is the aerodynamic heating of the vehicle.
A. Foreest +3 more
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Transpiration-Cooled Nosetip Development.
1980Abstract : A 316L stainless steel transpiration-cooled nosetip for a high-performance missile system was designed and fabricated using powder metallurgy techniques. The geometry of the nosetip was established, and permeability requirements were analytically defined.
M. T. Martin +2 more
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Mathematical models of transpiration cooling
Journal of Engineering Physics, 1987Possible identification of two mathematical models of transpiration cooling is analyzed. Processes with heat supply in parallel with or normal to the direction of the injection of a coolant are considered.
A. V. Kurpatenkov +2 more
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Transpirationskühlung (transpiration cooling)
2000Es handelt sich um eine spezielle Methode zur Kuhlung von Oberflachen (engl.: heat protection), bei der ein Kuhlfluid durch eine porose Wandstruktur an die Oberflache gelangt. Es besteht physikalisch eine enge Verwandtschaft zur sog. Filmkuhlung. Im Unterschied zu dieser Form der Oberflachenkuhlung ist die Temperatur des Kuhlfluides an der Oberflache ...
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Transpirational Performance of Oriented Porous SiC Transpiration Cooling Materials
Key Engineering Materials, 2008The application and the transpirational behavior of oriented porous SiC as transpiration cooling materials in a simulating test were studied. The test sample was shaped by freeze-casting process and reaction sintered. The testing device was composed by an electric arc combustor and a hydrogen coolant providing system. It was found that the permeability,
Jie Tang +4 more
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