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Tuesday, July 9 • 10:30 - 13:00

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It is well known that 90% оf Liquid Rocket Engine (LRE) failures link to the highest level of pressure pulsations and vibration in turbo pumps. Thus, reliability and lifetime of the LRE depend on reduction of pressure pulsations and hydrodynamic vibration of the pump casing. The computational and physical modeling of pressure pulsation phenomena must be based on the dual nature of pressure pulsations in the pump flow path. At the outlet of the centrifugal impeller acoustic oscillations appear that are propagated at the speed of sound in the operating fluid. At the same time, there are vortex disturbances that are convected by the main flow and called the vortex mode (pseudosound). Decomposition of pressure pulsations in the screw-centrifugal pumps leads to the acoustic-vortex wave equation with a dimensionless similarity criterion of the given problem. The parameter is the product of Mach number and Strouhal number and represents the ratio of the impeller tip radius to the main BPF wave length. It is the ratio of the impeller tip velocity to the speed of sound multiplied by a factor proportional to the number of blades. The tip velocity characterizes the pseudo-sound propagation velocity whilst the speed of sound relates to acoustic mode pressure oscillations. Based on the last relationship, one can construct a method of physical modeling of pressure pulsations in a centrifugal pump using a pump air model.

Tuesday July 9, 2019 10:30 - 13:00 EDT
St-Laurent 3, Board 13-A
  T03 Aero… aircrft noise & vibr., RS01 Aeroacoustics

Attendees (6)