VAPORIZING AND ENDOTHERMIC FUELS FOR ADVANCED ENGINE APPLICATION.
Abstract
The investigation of the feasibility of using hydrocarbons as heat sink fuels for hypersonic aircraft is continuing. Both thermal and catalytic endothermic reactions are being considered at temperatures up to 1400 F, pressures to 1000 psi, and liquid hourly space velocities to 260 and 150, respectively. The methylcyclohexane-Pt/Al2O3 combination still appears most promising for achieving a goal of 2000 Btu/lb of fuel, although laboratory studies suggest that two-ring naphthenes may be about equivalent. Additional runs were made with MCH-Pt/Al2O3 in the 20 gal/hr fuel system simulation test rig to check heat sinks and heat transfer coefficients. Maximum values obtained were 1930 Btu/lb heat sink (with post catalyst bed heating to 1400 F) and a coefficient of 1200 Btu/hr/sq ft/degree F in the catalyst bed reaction at LHSV = 122 at bed conditions of about 1000 F and 900 psi. Further shock tube studies of feeds and reaction products indicate only a minor structural effect factor among the isomeric dimethylcyclohexanes (or o-xylene/3 H2) on ignition delay at low equivalence ratios over the temperature range 1400-1700 F, but ignition delays are about a factor of 2-3 longer than comparable values with MCH. Among the isomeric octanes ignition delay increases with increasing branching. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1965
- Accession Number
- AD0478250
Entities
People
- A. C. Nixon
- A. W. Ritchie
- G. H. Ackerman
- H. T. Henderson
- R. D. Hawthorn