The influence of hydrofoil oscillation on boundary layer transition and cavitation noise
Abstract
Effects of boundary layer characteristics on cavitation and the effect of unsteady cavitation on noise were studied. Three pinhole-type pressure transducers were installed on the foil surface to measure pressure fluctuations and a hydrophone was used to measure the radiated cavitation noise. Two subjects are discussed: relationship of boundary layer transition and pressure fluctuations with the hydrofoil in oscillation, and noise generated by unsteady cavitation. The magnitudes of pressure fluctuations in transition and turbulent regions are independent of oscillation amplitude and frequency. However, the development of boundary layer and occurrence of transition are delayed with an increase in oscillation frequency. The influence of hydrofoil oscillation on cavitation inception is also discussed.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- April 1981
- Bibcode:
- 1981STIN...8125344S
- Keywords:
-
- Boundary Layer Transition;
- Cavitation Flow;
- Hydrofoil Oscillations;
- Water Tunnel Tests;
- Noise Measurement;
- Pressure Measurement;
- Pressure Sensors;
- Transition Flow;
- Turbulent Flow;
- Fluid Mechanics and Heat Transfer