Accession Number : AD1022771


Title :   Comparison between Hydrogen, Methane and Ethylene Fuels in a 3-D Scramjet at Mach 8


Descriptive Note : Technical Report,01 Apr 2013,27 Mar 2015


Corporate Author : THE UNIVERSITY OF QUEENSLAND BRISBANE Australia


Personal Author(s) : Smart,Michael K


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1022771.pdf


Report Date : 24 Jun 2016


Pagination or Media Count : 50


Abstract : Gaseous hydrogen has typically been the fuel of choice for scramjets operating at speeds greater than Mach 7. This is because ofits high specific energy content, as well as its fast reaction characteristics in air. The disadvantage of hydrogen is its low density,which is a particular problem for small vehicles with significant internal volume constraints. The current study investigated the use ofgaseous methane as a fuel for a Mach 8 scramjet. This involved experiments with a 3-D scramjet using a cavity based flame holderin the T4 shock tunnel at The University of Queensland, as well as a companion fundamental CFD study. The performance of smallchained hydrocarbons (ethylene and methane) was compared with hydrogen to establish the importance of its lower specificenergy content and slower reaction characteristics. In addition, a scoping study was performed to determine the capability fordirect connect testing in the T4 shock tunnel.


Descriptors :   JET PROPULSION , supersonic combustion ramjet engines , computational fluid dynamics , ignition lag , boundary layer , pressure distribution , combustors , shock tunnels , hydrocarbon fuels , spark ignition , heat transfer , fuel injection , pressure measurement , shock tubes , HYPERSONIC FLOW , MACH NUMBER


Subject Categories : Fluid Mechanics
      Jet and Gas Turbine Engines


Distribution Statement : APPROVED FOR PUBLIC RELEASE