Propeller and hull cavitation test
- Cavitation tests of a propeller in behind condition in HRC free-surface cavitation tunnel T-31.
- The test set-up consists of an aft hull dummy with propeller, shafting, brackets and rudder, mounted on a test rig. The hull model generates the main flow features of the propeller wake. Added flush-mounted grids or wake screens simulates the correct wake as measured in a towing tank test.
- Propeller thrust and torque are measured using a dynamometer between the propeller hub and shaft.
- Pressure pulses are measured in the hull plating above the propeller using several flush-mounted pressure transducers.
- Cavitation observations are made visual using stroboscopic light synchronised with the shaft speed. Documentation of cavitation is made with standard video and/or high-speed video.
- A full set of tests comprising of:
- Thrust, torque, shaft speed measurements
- Cavitation observations
- Cavitation inception test
- Cavitation erosion test
- Pressure pulse and noise measurements
