Performance Investigation of the Propulsion System Using Contra Rotating Propeller

Improving the propulsion efficiency of the engine has always been the goal of the propeller designers. Various propeller configurations have been introduced in the past to meet this goal, and contra-rotating propellers (CRP) are no longer a new concept. The CRP is one of the propulsion engines that can help to improve the propulsion efficiency compared to traditional single propeller engines based on its ability to recover the energy lost due to rotation behind the propeller. Using CRP to replace the traditional propeller engine will help save the amount of fuel needed. This advantage makes the design and analysis methods for CRP receive much attention. Therefore, a new set-up calculation design method based on lifting line theory is used. The second step is design the shape for the propeller corresponding to the vortex distribution just found. Finally, the process is repeated with many different configurations to find the optimal design. The main objective of the study is to determine the design calculation method by using numerical model (determining the optimal vortex distribution) for CRP so that the selection time between methods can be reduced. Thereby, it makes the basis for the next design steps more convenient.