Cavitation tests of a propeller in behind condition in KHRC 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.
