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- W2334815799 abstract "[Abstract] State of the art afterburner combustion employs spray bars and flameholders in a long cavity, which adds significant weight and size to the engine. This paper presents a feasibility study for the development of a compact “Prime and Trigger” afterburner that eliminates the flameholders and reduces the length of the engine. In this concept, fuel is injected just upstream or in between the turbine stages in such a manner that upon exiting the turbine the fuel has evaporated and premixed without significant combustion, a process referred to as priming. If necessary, reactions are triggered by an igniter in order to ensure complete combustion in the afterburner. This concept is investigated using an experimental setup that simulates the typical velocity, temperature, and oxygen content of a gas turbine engine. Realistic turbine pressures are not attained in this near-atmospheric facility in order to reduce the cost and complexity of its design. However, the difference in operating pressure between this facility and turbine engines limits the extent of the feasibility analysis, since high pressure operation may lead to different results. This paper addresses this issue by providing a theoretical assessment of the effects of high pressure on the priming and autoignition process. First, we describe a developed theoretical model that predicts the location and nature of the fuel autoignition. Next, preliminary experimental results are presented which verify the feasibility of fuel priming and autoignition at low pressures and show good agreement with the developed theoretical model. Finally, the theoretical model is extended to high pressure operating conditions. We identify the effects of high pressure on chemistry and droplet vaporization and provide a treatment of flash-boiling of the fuel, which may occur due to a rapid decrease in ambient pressure. From the theoretical assessment, we conclude that fuel priming and autoignition is feasible at high pressure and may even benefit from it." @default.
- W2334815799 created "2016-06-24" @default.
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- W2334815799 date "2007-01-08" @default.
- W2334815799 modified "2023-09-23" @default.
- W2334815799 title "Development of a Prime and Trigger Concept for Compact Afterburner Combustion" @default.
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- W2334815799 doi "https://doi.org/10.2514/6.2007-562" @default.
- W2334815799 hasPublicationYear "2007" @default.
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