2nd International Conference on Technological Advances in Podded Propulsion, 3-5 October 2006, Brest, France
This paper describes an experimental study on a tractor-type podded propeller and strut. The focus is on the time varying pressure distribution around the leading edge of the strut where the propeller wake interacts strongly with the strut. Measurements were made of strut surface pressures and shaft forces on a podded propeller model at a sampling rate of 5000Hz. Both the shaft forces and the surface pressures measured at 56 locations were broken into time-averaged and phase-averaged components. These are relevant to the propeller's integrated and transient performance characteristics, respectively. The pressure measurements show low time-averaged pressure was concentrated in the area on the suction side around the leading edge of the strut. The lowest pressure was located near the junction of the strut and pod. The largest pressure fluctuation occurred on the leading edge where the tip-vortex impacted on the strut. The wake impingement effect on the propeller performance was evaluated based on the measurement of the propeller shaft forces. The evaluation was made by comparing the shaft forces measured over two tests with and without the installation of the pod and the strut. It showed that the presence of the pod and strut increased shaft forces and the propeller efficiency, but no significant effect on the amplitude of the phase-averaged propeller shaft forces was found. The paper presents and discusses the most significant experimental results.
2nd International Conference on Technological Advances in Podded Propulsion [Proceedings].