Bend Stream-tube Method Of Calculating The Hydrodynamic Performance Of Cycloidal Propeller And Rotor

In this paper a method is developed to calculate the hydrodynamic performance of Cycloidal Propeller and Cycloidal Rotor at arbitrary direction angle. This method is based on the method of D.M.Zhu and Taniguchi. In this method Bend stream-tube is used to the single stream-tube. Regarding the propeller as a skew actuator. Under the function of the skew actuator, produce the induced velocity of skew direction,and make water current direction change. With this model, the momentum theorem at two directions is used and for this model gets the induced velocity . At last, we can get the performance of Cycloidal Propeller or Cycloidal Rotor at arbitrary angles by the iterative method.With the method the performance of NSRDC Cycloidal Propeller is calculated, when J>0 andβis between -90°to +90°.Calculated results match well with experiment results. For the NSMB Cycloidal Rotor,calculated result and experiment results match better. The influence of water current direction on performance of the NSMB Cycloidal Turbine is discussed . The calculation result indicate that the influence on lengthways force , on transverse force ,the toque and the Turbine power coefficient all are obvious when water current direction changes from -30°to+30°.