Istrazivanja i projektovanja za privreduJournal of Applied Engineering Science


DOI: 10.5937/jaes0-29942 
This is an open access article distributed under the CC BY 4.0
Creative Commons License

Volume 19 article 866 pages: 886-895

Muhammad Arif Budiyanto*
Universitas Indonesia, Kampus Baru UI Depok, Department of Mechanical Engineering, Jawa Barat, Indonesia

Hamnah Ayuningtyas
Universitas Indonesia, Kampus Baru UI Depok, Department of Mechanical Engineering, Jawa Barat, Indonesia

Waterjet propulsion on an unmanned surface vehicle is a propulsion system with the working principle of taking wa-ter from the bottom of the hull into a turbine to be blown out the back, converted into the ship's thrust. The resulting thrust depends on the available water forces. The water spray in the nozzle is generated from an inlet at the bottom of the ship, which is assisted by a pump on the waterjet. In the inlet section, this will affect the distribution of flow that passes through the pump and out through the nozzle. The purpose of this study was to analyze the inlet passage of the jet of water, which is variable, with the inlet velocity ratio (IVR) to determine the maximum efficiency value of the waterjet propulsion system. The work of this study used the computational fluid dynamics (CFD) method and analytical calculations. The inlet velocity ratio was varied with values of 0.54, 0.59, 0.67, 0.78, 0.94, 1.18, 1.64, and 2.38. The results of the analysis included the volume that exited the waterjet outlet and the thrust value under differ-ent conditions. The highest thrust value obtained was based on an IVR value of 2.38, which also had the maximum efficiency value of 98%.

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The authors would like to express our gratitude to the Di-rectorate Research and Development Universitas Indo-nesia (RISBANG-UI) for providing funding from the Uni-versity of Indonesia through PUTI Q3 NKB-2011/UN2.RST/HKP.05.00/2020.

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