Dynamic Characterization of Double Swirl Injectors for GOX/Kerosene

Abstract

The Institute for Flight Propulsion (LFA) of the Technische Universität München (TUM) operates a high pressure combustion facility, which serves as a testbed for injector element characterization, film and transpiration cooling as well as material compatibility tests both in national and international research programs. Especially tests to characterise film and transpiration cooling require efficient and stable combustion with minimum pressure oscillations in the chamber. During some test campaigns, the baseline injector showed increased HF pressure oscillations, which had not been observed during the commissioning of the injector in the past. A detailed analysis was performed identifying possible causes for the HF oscillations. Consequently, the possible mechanisms were investigated in a dedicated test campaign, leading to an optimized design of the injector.

Experimental Investigations of a GO2/Kerosene Ejector Rocket Chamber for the RBCC Propulsion System

“…S. Soller et al 7 had tested two different type GO 2 /kerosene injectors in a single element combustor with a wide variety of design parameters. Gregor Schlieben et al 8 had minutely studied the Dynamic Characterization of Double Swirl Injectors. Their plentiful tests data did offer a design guideline of the GO 2 /kerosene injector.…”

“…5-5.5), scramjet-mode (Ma=5. [5][6][7][8][9][10][11][12], when the flight altitude is too high for the engine to catch enough air to produce thrust the engine come to pure-rocket mode. In order to research how do the different inject ratio under those diverse modes work on the engine performance in the direct-connection ground-tests, the ejector rocket chamber was required to work steadily in a wide total mass flow rate range of 500g/s to 1200 g/s, chamber pressure of 2 MPa, and mixture ratio of O/F=1.…”

Influence of Mass Flow Rate on the Atomization Characteristics of Screw Conveyor Swirl Injectors

“…Ahmad Hussein Abdul Hamid et al [14] studied the influences of the Reynolds number, injection pressure drop, and injection pressure on the performance of a screw conveyor swirl injector and acquired the influence law on the discharge coefficient, spray angle, and breakup length through cold flow experiments with water as a single working fluid. Gregor Schlieben et al [15] performed thermal experimental research on the influences of different injector configurations on combustion stability and emphasized that the configuration of the gas injector does not significantly affect combustion stability, and instead the geometry of the screw conveyor swirl fuel injector highly influences combustion stability. There is no reference in this research to the change in mass flow rate.…”