Compressibility effects in the Kemp-Sears Problem
Abstract
The effects of including compressibility in the Kemp-Sears problem of aerodynamic interference between moving blade rows are examined. Methods of linearized, subsonic, plane, unsteady flow are adopted. The major new effect is that a resonance appears at certain combinations of flow Mach number, tip Mach number, and blade vane ratios. The resonance is at exactly the Tyler-Sofrin cutoff condition for rotor-stator interaction. At such conditions the unsteady lift on a blade row due to externally imposed nonstationary upwash vanishes. However, the resonance appears to be very sharp and seems to be more significant as an indication that around this condition the unsteady lift changes very rapidly.
- Publication:
-
Fluid Mechanics, Acoustics, and Design of Turbomachinery
- Pub Date:
- 1974
- Bibcode:
- 1974fmad.rept..513M
- Keywords:
-
- Aerodynamic Interference;
- Compressibility Effects;
- Subsonic Speed;
- Turbine Blades;
- Turbomachinery;
- Unsteady Flow;
- Air Flow;
- Flow Characteristics;
- Resonant Frequencies;
- Wave Propagation;
- Fluid Mechanics and Heat Transfer