Evaluation of computational modeling of electron transpiration cooling at high enthalpies

Kyle M. Hanquist; Hicham Alkandry; Iain D. Boyd

doi:10.2514/1.T4932

Evaluation of computational modeling of electron transpiration cooling at high enthalpies

Kyle M. Hanquist, Hicham Alkandry, Iain D. Boyd

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

Amodeling approach for electron transpiration cooling of high-enthalpy flight is evaluated through comparison to a set of experiments performed in a plasma arc tunnel for air and argon. The comparisons include air and argon flow at high enthalpies (27.9 and 11.6 MJ/kg, respectively), with a Mach number of 2.5 to 3. The conversion of the reported enthalpies and Mach numbers to freestream temperatures and velocities is discussed. The numerical approach is described, including implementation of a thermionic emission boundary condition and an electric field model. Also described is the implementation of a finite-rate chemistry model for argon ionization. Materials with different electron emission properties are also investigated, including graphite and tungsten. The comparisons include two different geometries with different leading-edge radii. The numerical results produce a wide range of emitted current due to the uncertainties in freestream conditions and emissive material properties, but they still agree well with the experimental measurements.

Original language	English (US)
Pages (from-to)	283-293
Number of pages	11
Journal	Journal of Thermophysics and Heat Transfer
Volume	31
Issue number	2
DOIs	https://doi.org/10.2514/1.T4932
State	Published - 2017
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics
Aerospace Engineering
Mechanical Engineering
Fluid Flow and Transfer Processes
Space and Planetary Science

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title = "Evaluation of computational modeling of electron transpiration cooling at high enthalpies",

abstract = "Amodeling approach for electron transpiration cooling of high-enthalpy flight is evaluated through comparison to a set of experiments performed in a plasma arc tunnel for air and argon. The comparisons include air and argon flow at high enthalpies (27.9 and 11.6 MJ/kg, respectively), with a Mach number of 2.5 to 3. The conversion of the reported enthalpies and Mach numbers to freestream temperatures and velocities is discussed. The numerical approach is described, including implementation of a thermionic emission boundary condition and an electric field model. Also described is the implementation of a finite-rate chemistry model for argon ionization. Materials with different electron emission properties are also investigated, including graphite and tungsten. The comparisons include two different geometries with different leading-edge radii. The numerical results produce a wide range of emitted current due to the uncertainties in freestream conditions and emissive material properties, but they still agree well with the experimental measurements.",

author = "Hanquist, {Kyle M.} and Hicham Alkandry and Boyd, {Iain D.}",

note = "Funding Information: The authors gratefully acknowledge support for this work from the Lockheed Martin Corporation. In addition, we thank Luke Uribarri and Edward Allen of Lockheed for essential technical oversight. The authors also thank Erin Farbar and Kentaro Hara from the University of Michigan for several useful discussions. This research was supported in part through computational resources and services provided by Advanced Research Computing at the University of Michigan in Ann Arbor. Publisher Copyright: Copyright {\textcopyright} 2016 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.",

year = "2017",

doi = "10.2514/1.T4932",

language = "English (US)",

volume = "31",

pages = "283--293",

journal = "Journal of Thermophysics and Heat Transfer",

issn = "0887-8722",

publisher = "American Institute of Aeronautics and Astronautics Inc. (AIAA)",

number = "2",

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AU - Hanquist, Kyle M.

AU - Alkandry, Hicham

AU - Boyd, Iain D.

N1 - Funding Information: The authors gratefully acknowledge support for this work from the Lockheed Martin Corporation. In addition, we thank Luke Uribarri and Edward Allen of Lockheed for essential technical oversight. The authors also thank Erin Farbar and Kentaro Hara from the University of Michigan for several useful discussions. This research was supported in part through computational resources and services provided by Advanced Research Computing at the University of Michigan in Ann Arbor. Publisher Copyright: Copyright © 2016 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

PY - 2017

Y1 - 2017

N2 - Amodeling approach for electron transpiration cooling of high-enthalpy flight is evaluated through comparison to a set of experiments performed in a plasma arc tunnel for air and argon. The comparisons include air and argon flow at high enthalpies (27.9 and 11.6 MJ/kg, respectively), with a Mach number of 2.5 to 3. The conversion of the reported enthalpies and Mach numbers to freestream temperatures and velocities is discussed. The numerical approach is described, including implementation of a thermionic emission boundary condition and an electric field model. Also described is the implementation of a finite-rate chemistry model for argon ionization. Materials with different electron emission properties are also investigated, including graphite and tungsten. The comparisons include two different geometries with different leading-edge radii. The numerical results produce a wide range of emitted current due to the uncertainties in freestream conditions and emissive material properties, but they still agree well with the experimental measurements.

AB - Amodeling approach for electron transpiration cooling of high-enthalpy flight is evaluated through comparison to a set of experiments performed in a plasma arc tunnel for air and argon. The comparisons include air and argon flow at high enthalpies (27.9 and 11.6 MJ/kg, respectively), with a Mach number of 2.5 to 3. The conversion of the reported enthalpies and Mach numbers to freestream temperatures and velocities is discussed. The numerical approach is described, including implementation of a thermionic emission boundary condition and an electric field model. Also described is the implementation of a finite-rate chemistry model for argon ionization. Materials with different electron emission properties are also investigated, including graphite and tungsten. The comparisons include two different geometries with different leading-edge radii. The numerical results produce a wide range of emitted current due to the uncertainties in freestream conditions and emissive material properties, but they still agree well with the experimental measurements.

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Evaluation of computational modeling of electron transpiration cooling at high enthalpies

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