Near and Far Field Propeller Wake Study Using Laser Doppler Velocimetry
1988
Blanton, James N. | Fish, Scott
Two towing tank experiments using a slender boat and a body of revolution model to produce a propeller wake near the free surface were conducted. The first experiment demonstrated the feasibility of the LDV measurement system by utilizing several modes of velocity data collection and correlation in the propeller wake. Mean and blade rate periodic turbulent flow quantities were collected showing good comparison with other published data in the region slightly downstream ( < 1 diameter) of the propeller. It was also found that by 5 diameters downstream, the periodicity of the velocity distribution was no longer visible. In the second experiment, streamwise mean velocity measurements were obtained far downstream (18 diameters) of the propeller. Preliminary propeller wake characteristics were measured for the purpose of gaining an understanding of the growth rate and nature of the flow.
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