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Ocean Systems Engineering Volume 14, Number 1, March 2024 , pages 53-72 DOI: https://doi.org/10.12989/ose.2024.14.1.053 |
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Experimental and statistical investigation of torque coefficient in optimized surface piercing propeller |
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Masoud Zarezadeh, Nowrouz Mohammad Nouri and Reza Madoliat
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| Abstract | ||
| The interaction of the blade of surface-piercing propellers (SPPs) with the water/air surface is a physical phenomenon that is difficult to model mathematically, so that such propellers are usually designed using empirical approaches. In this paper, a newly developed mechanism for measuring the torque of SPPs in an open water circuit is presented. The mechanism includes a single-component load cell and a deformable torque sensor to detect the forces exerted on the propeller. Deformations in the sensor elements lead to changes in the strain gauge resistance, which are converted into voltage using a Wheatstone bridge. The amplified signal is then recorded by a 16-channel data recording system. The mechanism is calibrated using a 6-DoF calibration system and a Box-Behnken design, achieving 99% accuracy through multivariate regression and ANOVA. Finally, the results of performance tests on a 4-blade propeller were presented in the form of changes in the torque coefficient as a function of feed rate. The results show that the new mechanism is 8% more accurate than conventional empirical methods. | ||
| Key Words | ||
| experimental test; manufacturing; statistical study; surface-piercing propellers | ||
| Address | ||
| Masoud Zarezadeh, Nowrouz Mohammad Nouri and Reza Madoliat: School of Mechanical Engineering, Iran University of Science and Technology, Narmak, Heydarkhani St., Tehran, 16846-13114, Iran | ||
