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Full-Text Articles in Engineering
Performance Of A Small Internal Combustion Engine Using N-Heptane And Iso-Octane, Cary W. Wilson
Performance Of A Small Internal Combustion Engine Using N-Heptane And Iso-Octane, Cary W. Wilson
Theses and Dissertations
With the sustained interest in Unmanned Aircraft Systems (UAS) and Micro Air Vehicles (MAV), the military services have a real need for vehicles powered by an internal combustion (IC) engine that can run efficiently on heavy hydrocarbon fuels, especially JP-8 due to established logistics. This thesis concerns the results of running a two horsepower, 4-stroke, spark-ignition engine (FUJI BF34-EI) with both iso-Octane and n-Heptane. Results include the knocking characteristic of this engine with n-Heptane, a comparison of the brake specific fuel consumption (BSFC) of the two fuels in a factory delivered engine configuration with a 17x10 APC propeller loading, a …
Cavity Coupled Aeroramp Injector Combustion Study, Dell T. Olmstead
Cavity Coupled Aeroramp Injector Combustion Study, Dell T. Olmstead
Theses and Dissertations
The difficulties with fueling of supersonic combustion ramjet engines with hydrocarbon based fuels presents many challenges that are currently being tackled by the Air Force Research Lab Propulsion Directorate Aerospace Propulsion Division. As the scramjet engine designs are scaled up, the need for a better solution to supersonic mixing has led to the development of many different styles of fuel injection. An aerodynamic ramp injector has been shown to have a quantitative improvement over a physical ramp while still achieving desirable mixing characteristics. The objectives for this research was quantifying the performance and operability implications of replacing four 15 degree …
Detonation Branching In A Pde With Liquid Hydrocarbon Fuel, Kristin L. Panzenhagen
Detonation Branching In A Pde With Liquid Hydrocarbon Fuel, Kristin L. Panzenhagen
Theses and Dissertations
A pulse detonation engine (PDE) capitalizes on the large mass flux and pressure rise associated with detonations to create thrust, which is proportional to PDE cycle frequency. This research showed that using a branched detonation as an ignition source, as opposed to standard spark ignition, deposits more energy into the thrust tube head. The increase in energy decreases ignition delay and detonation to deflagration transition (DDT) time. This allows a theoretical 85% cycle frequency increase that is accompanied by an 85% increase in thrust. The increase in energy also reduces the need for a DDT enhancement device, thereby increasing thrust …