HYDRODYNAMIC JET REACTION ANALYSIS FOR MARINE PROPULSION CONTROL UNITS

Authors

  • Lyuba Gyurova dept. Mechatronics, Nikola Vaptsarov Naval Academy Varna, Bulgaria
  • Cvetelina Velkova dept. Mechatronics, Nikola Vaptsarov Naval Academy Varna, Bulgaria

DOI:

https://doi.org/10.68302/std2026.vol2.79

Keywords:

conservation of momentum, deflector surfaces hydrodynamic jet reaction, marine waterjet propulsion, mechatronic control system

Abstract

Modern requirements in shipbuilding and marine engineering necessitate continuous improvement of propulsion systems, with particular emphasis on waterjet propulsors due to their high manoeuvrability and efficiency at elevated speeds. This study presents an analysis of hydrodynamic reaction forces generated during the interaction of a high-speed water jet with deflector surfaces of varying geometries. The results demonstrate that the jet deflection angle strongly influences efficiency, with the semi-circular surface achieving the highest energy utilization.

The experimental investigation was conducted using a specialized laboratory test stand (HM 150.08), enabling precise measurement and quantitative assessment of momentum change. Four deflector geometries were examined: flat (90° deflection), semi-circular (180°), oblique (45°), and conical (135°). Experimental results were compared with theoretical predictions based on the conservation of momentum.

The results confirm that the jet deflection angle plays a critical role in system efficiency, with the semi-circular surface achieving the highest energy utilization and the oblique surface the lowest.

Supporting Agencies

This report/article was financed by the Ministry of Education and Science under the National Science Program "Security and Defense", carried out in implementation of the National Strategy for the Development of Scientific Research 2017-2030 and adopted by Decision of the Council of Ministers No. 731 of October 21, 2021. The material reflects only the author's opinion and the Ministry of Education and Science is not responsible for the content.

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References

[1] F. M. White, Fluid Mechanics, 8th ed. New York, NY, USA: McGraw-Hill Education, 2015.

[2] B. R. Munson, D. F. Young, T. H. Okiishi, and W. W. Huebsch, Fundamentals of Fluid Mechanics, 7th ed. Hoboken, NJ, USA: Wiley, 2012.

[3] J. Carlton, Marine Propellers and Propulsion, 3rd ed. Oxford, UK: Butterworth-Heinemann, 2012.

[4] J. Sloane, High Speed Marine Craft. Cambridge, UK: Cambridge University Press, 2012.

[5] T. I. Fossen, Handbook of Marine Craft Hydrodynamics and Motion Control. Hoboken, NJ, USA: Wiley, 2011.

[6] T. Perez, Ship Motion Control: Course Keeping and Roll Stabilization Using Rudder and Fins. London, UK: Springer, 2005.

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Published

17.09.2026

Issue

Vol. 2 (2026): Proceedings of the International Conference on Secure Systems Design and Technology Development.

Section

ENGINEERING SCIENCES AND PRODUCTION TECHNOLOGY

License

Copyright (c) 2026 Lyuba Gyurova, Cvetelina Velkova

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

How to Cite

[1]
L. Gyurova and C. Velkova, “HYDRODYNAMIC JET REACTION ANALYSIS FOR MARINE PROPULSION CONTROL UNITS”, SysTechDev, vol. 2, pp. 103–106, Sep. 2026, doi: 10.68302/std2026.vol2.79.