Measurement of Propeller Slipstream by Laser Doppler Velocimeter

Abstract

Knowledge of the flow field around a propeller is essential for the design of energy saving devices around a propeller. In this paper, Laser Doppler Velocimeter (LDV) was used in circulating water channel to measure flow field around a model propeller in uniform flow. Experimental results were compared to data measured by 5-hole pitot tube. And flow field was calculated by the theory of infinite number of blades considering approximate contraction effect and calculated results were compared to experimental data. The good agreement was obtained between calculated values and measured values.