Analysis Symmetrical Blade Propeller Performance for Jalapatih 3 Ship Using CFD

− Solar Sport One is a prestigious competition held annually in the Netherlands. The competition focuses on innovation, technology, and sustainable energy. Based on the experience/participation of Marine Solar Boat Team (MSBT) ITS in Event Solar Sport One 2018 using Jalapatih 3 vessel, then researched the propulsion system especially propeller for use in the next Solar Sport One event. This paper is done research using an opensource program called Openprop to design a propeller using numerical calculations for the ship Jalapatih 3. The research is conducted in several phases, where our initial stage of designing and counting numerically uses Openprop and comparing the calculation results with CFD simulation results as Performance analysis of the selected propeller. From a propeller model that has been designed, Fortescue Blade Propeller has not been able to push the ship Jalapatih 3 at 16 knots and the result of the comparison, gained the difference of Thrust J = 1.4 of 22.063 N while Torque value has a difference of 2.35 Nm. Keywords− CFD, jalapatih 3, propeller, solar sport one.


Solar Sport One (SSO) is a competition in the
Netherlands. The competition is on innovation, technology, and sustainable energy. The competition is attended by students and professionals from all over the world.
The race was first participated by its Marine Solar Boat (MSBT) Team in 2014 using Jalapatih 1. As the pioneer of the first solar-powered ship in Indonesia, the MSBT team participated in this most prestigious race. The latest innovation from its current MSBT team is the Jalapatih 3 ship. The ranking earned in this race in 2018 is the 3rd Top Speed Record SSO 2018 with a speed of 23.5 km/h. This achievement is still very far compared to other teams.
Based on the experience of the participation, there are many evaluations and team development plans to compete with better performance. the thing to note is the propulsion system on Jalapatih ships that are still lacking in terms of research. Especially on propellers. The propeller owned by the current team is still not able to drive Jalapatih 3 at a speed of 30 km /h. These speed parameters are key for its MSBT team to win the next SSO. In this paper, the authors conducted performance research from symmetrical blade propeller to Jalapatih 3 using CFDs.
The basis of this research is to find out the efficiency of the propeller model in the design. To  (1)

A. Literature Studies
Looking for literature studies from several reference sources related to propeller design using numerical calculations replicated using open-source application Openprop.
1) The Meaning of propeller Propeller is an important part of the propulsion system onboard. The working principle of the propeller is to produce thrust by rotating and sucking the flow of fluid. Various types of propellers have been developed according to the ship's function. Currently, the development of the propeller has many including A-series, B-series, C-series, K-series, Surface Piercing Propeller and so on. Geometry Propeller.
2) The geometry of the propeller is part of the propeller itself. If the geometry of the propeller is damaged, it lowers the performance of the propeller itself.
OpenProp is an open-source program that can be used for the design, analysis, and fabrication of optimized propellers and horizontal axis turbines. [4] The numerical method of this application uses the Lifting Line Theory. In this study, we used this open-source program, OpenProp, which is operated with MATLAB

B. Data Collection
Collection of primary and secondary data for this research and to determine the primary dimensions of the propeller be designed. The data is in the form of Jalapatih 3, RPM propeller, thrust deduction factor, and wake fraction value.

C. Calculation of Propeller Using Openprop
To run the Openprop program, a MATLAB application is required. The results of the calculation use Openprop in the form of geometry propeller, KT value, KQ, and propeller efficiency.

D. Simulation Using CFD
Numeric calculation data is then simulated using CFDs resulting in Thrust and Torque values to calculate KT, KQ, and Efficiency coefficient values using equations (1), (2), and (3).

1) Data Collection
In designing propeller designs, we need the ship's main data, namely general arrangement, principle dimension, and ship Resistance.
Then a prisoner simulation was conducted using CFDs with the Numeca FineMarine app. The results of this simulation will be conducted at a speed of 12 knots to 17 knots. The simulation results can be seen in figure  3 and table 1.   From the calculation results, Openprop also found an Open Water Test diagram that shows the performance of the propeller that has been designed. 3D Model Creation In this study, the creation of 3D models used coordinatescurve coordinates produced by Openprop and used Solidwork applications and also to ensure that the model was solid. Then, the file is exported into Parasolid form before being simulated.

5)
Model Validation Model validation is performed to see if the model used is valid. Here's the data propeller that will be validated: Here is a comparison of calculation results using Openprop and CFDs as follows:   In the comparison of KQ values, the largest difference in value at J = 0.2 is 0.2427 while the smallest difference in value at J = 0.8, which is 0.0175. same as the Thrust value, at J = 0.2 the torque value of the CFD result is greater than the calculation. The torque value comparison results can be seen in Table 8.
In comparison to the propeller efficiency value, the value generated by both simulations is quite large. The efficiency of using Openprop is 0.82, while using CFD simulation yields an efficiency value of 0.84, having a difference of 0.02.

IV. CONCLUSION
The conclusions in the results of this study are based on the author's initial goal of knowing the characteristic of symmetrical blade propeller is. Therefore, from the simulation results that have been done, it can be concluded: 1. Designing propeller design using numerical calculation is expected to be able to drive Jalapatih 3 ships at its operational speed. However, after CFD simulation, this propeller design has not been able to provide thrust value for the operational speed of Jalapatih 3 ship at a speed of 16 knots.
2. The difference in thrust value in J = 1.4 is 22,063 N while torque value has a difference of 2.35 Nm.