The Experimental Study On Hydrodynamic Performances Of The Cycloidal Propeller

The paper studies the controllable pitch angle vertical-blade cycloidal propeller which is a kind of cycloidal propellers. The experimental study is the main studying method of the paper. We study hydrodynamic performances on different combined status of rotor speed, vane chord, vane number, eccentricity and advance coefficient. Then we can do cycloidal propeller designing and hydrodynamic performance designing on the basis of experiments.Firstly, the paper introduces the test apparatus and working characteristics of propeller which vanes are controlled by servo-actuators. And experimental parameters are elected, particular experimental scheme is made. Then the test and installment of equipments is completed. After these, we do hydrodynamic performance experiments on different status and achieve our necessary hydrodynamic experimental data.Secondly, we do the initial treatment and non-dimensional treatment of experimental data, and calculate trust coefficient, torque coefficient, propulsion efficiency of propeller on different status. Hydrodynamic performance curves of propeller of different status are draw on the basis of results. The changing rules of hydrodynamic performances of propeller on different status are also analyzed.Thirdly, the paper calculates hydrodynamic coefficient of the vane of different status on the basis of experimental data, such as normal force coefficient, tangential force coefficient, torque on vane rotation axis, trust coefficient on propeller, lateral force coefficient on propeller, torque on rotation axis of the vane. Then hydrodynamic performance curves are draw. After these, the paper analyze changing rules of the vane hydrodynamic performances on different status of fluid speed, rotor speed, eccentricity, vane chord, vane number and compactness.Finally, the paper calculates hydrodynamic performances of propeller on different status by methods of double-disk multi-tube which is based on momentum theorem. Then the calculating results are corrected on basis of tube shrinkage effect, non-stationary effect of the vane, interference effect among vanes. After comparing experimental results with calculating results, the reliability of double-disk multi-tube method is analyzed.