Enter your email address
Submit
Write your message
1- PhD. student, Faculty of Mechanical Engineering, Malek-Ashtar University of Technology; Iran, Isfahan.
2- Assistant Professor, Faculty of Mechanical Engineering, Malek-Ashtar University of Technology; Iran, Isfahan.
3- Professor, Faculty of Mechanical Engineering, Malek-Ashtar University of Technology; Iran, Isfahan.
2- Assistant Professor, Faculty of Mechanical Engineering, Malek-Ashtar University of Technology; Iran, Isfahan.
3- Professor, Faculty of Mechanical Engineering, Malek-Ashtar University of Technology; Iran, Isfahan.
Abstract: (72 Views)
This study investigates the effect of duct inlet length on the hydrodynamic performance of a pre-swirl pump-jet system, focusing on open water efficiency through uncertainty analysis. To this end, five models with varying duct inlet lengths (0~0.1DRotor) were experimentally tested in the cavitation tunnel at Imam Khomeini Naval University in Noshahr. Sampled parameters included rotor thrust, combined duct and stator thrust, and rotor torque at eight advance ratios (J). Each measurement was repeated four times, and their averaged values were utilized in the calculations. Sensitivity analysis revealed that torque has a more significant impact on open-water efficiency compared to total thrust. Experimental test results demonstrated that the open water efficiency for all configurations reached a maximum at J=1.1. The L=0.1DR configuration exhibited the highest efficiency at 62.15%, representing a 5.15% improvement over the L=0DR configuration. The relative uncertainty of efficiency was below 5%, and the L=0.1DR configuration showed the smallest uncertainty range, indicating high experimental precision. Furthermore, an examination of the open water efficiency uncertainty range revealed that for advance ratios of 0.6, 1.1, and 1.4, the L=0.1DR configuration yielded the widest efficiency range. The upper bound of open water efficiency also belonged to the L=0.1DR configuration for other advance ratios. Therefore, based on the results of the conducted uncertainty analysis, the L=0.1DR configuration demonstrates improved open water efficiency performance compared to other configurations. This improvement is attributed to increased thrust resulting from better uniformity of the flow entering the stator and optimized angle of attack to the rotor blades.
Keywords: Pre-swirl PumpJet, Duct Inlet Length, Stator-Rotor Distance, Hydrodynamic Performance, Open-Water Efficiency, Uncertainty Analysis
Type of Study: Research Paper |
Subject:
Submarine Hydrodynamic & Design
Received: 2025/05/23 | Accepted: 2025/07/8
Received: 2025/05/23 | Accepted: 2025/07/8
Audio file of the article abstract [MP3 3167 KB] (3 Download)
References
1. A comparison of pump jets and propellers for non-nuclear submarine propulsion Aidan Morrison January 2018
2. Renilson MR (2018) Submarine hydrodynamics, 2nd edn. Springer, Cham. [DOI:10.1007/978-3-319-79057-2]
3. A.Dean, D.Voss, Design and Analysis of Experiments, Springer Verlag: New York,1999. [DOI:10.1007/b97673]
4. Insttrumentation Measurement And Analysis, 4Th Edn, by B.C. Nakra And K.K. Chaudhry.2016
5. H.W.Coleman, W.G.Steele, Experimentation and Uncertainty Analysis for Engineers", John Wiley and Sons, Inc., New York.1999
6. Analysis of heat transfer and fuel regression rate of solid fuel in hybrid thrusters [M.Sc.Thesis], Researcher Mohammad Hossein Qaedsharaf, Islamic Azad University, Science & Research Branch, 2011
7. Motallebi-Nejad, M., Bakhtiari, M., Ghassemi, H. et al. Numerical analysis of ducted propeller and pumpjet propulsion system using periodic computational domain. J Mar Sci Technol 22, 559-573 (2017). [DOI:10.1007/s00773-017-0438-x]
8. Ghaedsharf, Mohammad Hossein, Ehsan, Mahdavi, Hadi and Mehrabi Gohari. (2019). Comparison of performance and sensitivity of effective parameters in two propellants hydrogen peroxide and nitrous oxide using uncertainty analysis. Mechanical Engineering, University of Tabriz, 50(3), 233-237. doi: https://10.22034/jmeut.2020.9802
9. Wang, C., Weng, K., Guo, C. et al. Analysis of influence of duct geometrical parameters on pump jet propulsor hydrodynamic performance. J Mar Sci Technol 25, 640-657 (2020). [DOI:10.1007/s00773-019-00662-z]
10. Huang, Q., Li, H., Pan, G., & Dong, X. (2021). Effects of duct parameter on pump-jet propulsor unsteady hydrodynamic performance. Ocean Engineering, 221, 108509. [DOI:10.1016/j.oceaneng.2020.108509]
11. Chen, X., Cheng, L., Wang, C., & Luo, C. (2021). Influence of inlet duct length on the hydraulic performance of the waterjet propulsion device. Shock and Vibration, 2021(1), 6676601. [DOI:10.1155/2021/6676601]
12. Zhou, Y., Pavesi, G., Yuan, J., & Fu, Y. (2022). A Review on Hydrodynamic Performance and Design of Pump-Jet: Advances, Challenges and Prospects. Journal of Marine Science and Engineering, 10(10), 1514 [DOI:10.3390/jmse10101514]
13. Zhou, Y., Pavesi, G., Yuan, J., Fu, Y., & Gao, Q. (2023). Effects of duct profile parameters on flow characteristics of pump-jet: A numerical analysis on accelerating and decelerating ducts distinguished by cambers and angles of attack. Ocean Engineering, 281, 114733. [DOI:10.1016/j.oceaneng.2023.114733]
14. Ji, X. Q., Zhang, X. S., Yang, C. J., & Dong, X. Q. (2024). Experimental and numerical investigation of the impacts of rotor tip-rake on excitation forces of pump-jet propulsors. Journal of Hydrodynamics, 1-16. [DOI:10.1007/s42241-024-0011-0]
15. Zou, D., Xue, L., Lin, Q., Xu, J., Dong, X., Ta, N., & Rao, Z. (2024). Influence of propulsion shafting longitudinal vibration on the excitation force and vortex dynamics characteristics of pump-jet propulsor. Ocean Engineering, 295, 116962. [DOI:10.1016/j.oceaneng.2024.116962]
16. Weng, K., Sun, C., Han, K., Wang, C., Sun, S., Li, P., & Hu, J. (2024). Experimental/numerical investigation on the hydrodynamic and noise characteristics of pump-jet propulsion. Ocean Engineering, 307, 117995. [DOI:10.1016/j.oceaneng.2024.117995]
17. Zhou, Y., Pavesi, G., Yuan, J., Fu, Y., & Gao, Q. (2024). Effects of duct profile parameters on flow characteristics of pump-jet: A numerical analysis on accelerating and decelerating ducts distinguished by cambers and angles of attack. Ocean Engineering, 281, 114733. [DOI:10.1016/j.oceaneng.2023.114733]
18. Qaedsharaf, M. H., Yari, E., & Manshadi, M. D. (2025). Cavitation on the pump jet pre swirl type due to changes in the stator chord length. Physics of Fluids, 37(3). [DOI:10.1063/5.0248017]
19. Carlton, J. S., Marine propellers and propulsion, third ed., Amsterdam, Netherland, Elsevier (2012) [DOI:10.1016/B978-0-08-097123-0.00010-1]
20. Bertram, V., Practical ship hydrodynamics Oxford, U.K, Butterworth Heinemann (2012)
Send email to the article author
| Rights and permissions | |
 |
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |
International Journal of Maritime Technology is licensed under a
Creative Commons Attribution-NonCommercial 4.0 International License.