Characterization of Rotating Cavitation in a Four Bladed Inducer
| Autor: | Vincent Wang, Zoltán S. Spakovszky, David E. Jackson, Claudio Lettieri |
|---|---|
| Přispěvatelé: | Massachusetts Institute of Technology. Department of Aeronautics and Astronautics, Spakovszky, Zoltan S, Lettieri, Claudio, Wang, Vincent |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
020301 aerospace & aeronautics
Engineering ComputingMilieux_THECOMPUTINGPROFESSION business.industry ComputerApplications_COMPUTERSINOTHERSYSTEMS 02 engineering and technology 01 natural sciences GeneralLiterature_MISCELLANEOUS 010305 fluids & plasmas 0203 mechanical engineering Cavitation 0103 physical sciences ComputingMilieux_COMPUTERSANDSOCIETY Inducer Aerospace engineering business |
| Zdroj: | Prof. Spakovszky via Barbara Williams |
| Popis: | This work aims to characterize the dynamic behavior of a four bladed inducer and clarify the physical mechanism that leads to the onset of rotating cavitation. The inducer under consideration is representative of a low-pressure liquid oxygen pump (LPOP) inducer of modern design and incorporates several standard design features used in rocket turbopumps to suppress rotating cavitation. The mechanism is characterized based on a combination of two-phase numerical simulations and inducer experiments. Experimental measurements demonstrate a supersynchronous rotating cavity in the periphery of the inducer inlet at frequencies between 1.2 and 1.6 times rotor frequency and a synchronous 2nd spatial harmonic pattern associated with alternate blade cavitation. The analysis indicates a causal link between alternate blade cavitation and rotating cavitation, with a distinct cut-on cut-off behavior. Numerical calculations and high-speed videos elucidate the mechanism of breakdown of alternate blade cavitation and the formation of rotating cavitation. The present work suggests that rotating cavitation is caused by the coupling of the cavities on adjacent blades during alternate blade cavitation. Due to the nearly tangential flow, the vortex lines from one of the non-cavitating blades wrap around the blade leading edge of the adjacent blade, which yields a drop in static pressure and cavity formation. The tip vortex cavity interaction with the leading edge of the blade leads to sheet cavity breakdown with periodic growth and collapse of cavities, creating the apparent super-synchronous rotation of the cavitating region. United States. National Aeronautics and Space Administration (NASA Marshall Space Flight Center) |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|