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Porous Versus Porthole Fuel Injection in a Radical Farming Scramjet: Numerical Analysis

Capra, Bianca R. and Boyce, Russell R. and Kuhn, Markus and Hald, Hermann (2015) Porous Versus Porthole Fuel Injection in a Radical Farming Scramjet: Numerical Analysis. Journal of Propulsion and Power, 31 (3), pp. 789-804. American Institute of Aeronautics and Astronautics (AIAA). DOI: 10.2514/1.B35404 ISSN 0748-4658

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Official URL: http://dx.doi.org/10.2514/1.B35404


Numerically computed engine performance of a nominally two-dimensional radical farming scramjet with porous (permeable carbon/carbon ceramic) and porthole fuel injection is presented. Inflow conditions with Mach number, stagnation pressure, and enthalpy of 6.44, 40.2 MPa, and 4.31 MJ∕kg, respectively, and fuel/air equivalence ratio of 0.44 were maintained, along with engine geometry. Hydrogen fuel was injected at an axial location of 92.33 mm downstream of the leading edge for each investigated injection method. Results from this study show that porous fuel-injection results in enhanced mixing and combustion compared to porthole fuel injection. This is particularly evident within the first half of the combustion chamber, where porous fuel injection resulted in mixing and combustion efficiencies of 76 and 63%, respectively. At the same location, porthole fuel injection resulted in efficiencies respectively of 58 and 46%. Key mechanisms contributing to the observed improved performance were the formation of an attached oblique fuel-injection shock and associated stronger shock-expansion train ingested by the engine, enhanced spreading of the fuel in all directions, and a more rapidly growing mixing layer.

Item URL in elib:https://elib.dlr.de/95984/
Document Type:Article
Title:Porous Versus Porthole Fuel Injection in a Radical Farming Scramjet: Numerical Analysis
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Capra, Bianca R.Queensland University of Technology, Brisbane, AustraliaUNSPECIFIED
Boyce, Russell R.University of New South Wales, Canberra, AustraliaUNSPECIFIED
Kuhn, Markusmarkus.kuhn (at) dlr.deUNSPECIFIED
Hald, Hermannhermann.hald (at) dlr.deUNSPECIFIED
Date:May 2015
Journal or Publication Title:Journal of Propulsion and Power
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.2514/1.B35404
Page Range:pp. 789-804
Talley, Douglas G.U.S. Air Force Research Laboratory
Powers, Joseph M.University of Notre Dame
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
Keywords:carbon/carbon, combustion, high-speed flow, porous injection, porous media, scramjet
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Raumfahrzeugsysteme - Konzepte und Entwurf, L - Combusion Chamber Technologies (old)
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Space System Integration
Deposited By: Kuhn, Markus
Deposited On:11 Jun 2015 11:08
Last Modified:08 Mar 2018 18:44

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