In this study, the effects of the diameter and quantity of fuel nozzles combined with various cavity-type flame holders for supersonic combustion were investigated empirically and numerically. Although increasing the quantity of fuel nozzles yields a greater fuel-to-air interface area, which results in a higher fuel–air mixing rate, smaller nozzle diameters yield a lower penetration depth, which results in a lower combustion performance at the top wall region. This study adopts the cavity shapes of fuel injectors from previous research studies to design new injector configurations with different sizes and quantities of fuel nozzles. The diameter and quantity of nozzles are determined to have the same equivalence ratio and momentum ratio as were used in previous research under a given fuel pressure. A comparison of results from the present tests with previous research shows that the plain cavity and zigzag cavity have distinct characteristics. Configurations using these cavity types were investigated via three-dimensional numerical analysis. It is concluded that a configuration consisting of a larger number of small fuel nozzles improves combustion performance significantly when installed without a cavity and slightly when installed with a plain cavity. However, combustion performance is degraded when a zigzag cavity is used.
Effects of Fuel Injectors and Cavity Configurations on Supersonic Combustion
Journal of Propulsion and Power ; 29 , 5 ; 1052-1063
2013-06-25
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Effects of Fuel Injectors and Cavity Configurations on Supersonic Combustion
Online Contents | 2013
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