The Effect of the Fillets on Submarine Wake Field and Propeller Unsteady Bearing Force
Abstract
:1. Introduction
2. Simulation Details
2.1. Governing Equations
2.2. Numerical Models
2.3. Test Case
3. Mesh Verification
3.1. Meshing
3.2. Verification of Resistance
3.3. Verification of Wake Flow
4. Results Analysis and Discussion
4.1. Distribution of Velocity
4.2. Uniformity of Wake Field
4.3. Analysis of Unsteady Bearing Force
5. Conclusions
- The velocity distribution on the propeller disk shows that the fillets improve the wake field of the submarine by reducing the horseshoe vortex of the tail rudder, and they mainly affect the flow field characteristics in the inner radius area.
- The analysis of the harmonic components shows that the fillets can effectively reduce the axial velocity pulsation from 0.15 to 0.5, and the wake field of the improved model is more uniform.
- The frequency–domain curve shows that the fillets can reduce the bearing force pulsation value from 0.07 to 0.03, indicating that the fillets are conducive to controlling the vibration and noise performance of the submarine propeller.
- The cavitation is not considered in this paper. In future research, the influence of the fillets on the unsteady excitation force of the submarine will be studied under the condition of considering cavitation.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Submarine length with full appendages L | 4.356 m |
Maximum hull diameter Dmax | 0.508 m |
Sail length | 0.368 m |
Tail section of airfoil | NACA0020 |
Scale ratio | 1:24 |
geometric parameters | DTMB4383 | |
Diameter (D/m) | 0.305 | |
Number of blades, Z | 5 | |
Hub diameter ratio, dh/D | 0.2 | |
Area ratio, AE/A0 | 0.725 |
Original Model | Improved Model | ||
---|---|---|---|
Resistance Calculation | Self-Propulsion Calculation | Resistance Calculation | Self-Propulsion Calculation |
Without propeller | With propeller | Without propeller | With propeller |
Mesh | Grid Number | CFD | EFD | Error |
---|---|---|---|---|
Fine | 5.12 M | 106.5 | 102.3 | 4.11% |
Medium | 3.85 M | 107.3 | 102.3 | 4.89% |
Corse | 2.25 M | 112.6 | 102.3 | 10.1% |
Force | — | BPF | 2BPF | 3BPF | Time-Average |
---|---|---|---|---|---|
KTx × 104 | Improved | 312 | 8.19 | 6.36 | 1932 |
Original | 722 | 7.41 | 5.61 | 1926 | |
KTy × 104 | Improved | 78 | 6.21 | 16.80 | 963 |
Original | 96 | 5.15 | 0.00 | 825 | |
KTz × 104 | Improved | 67 | 6.24 | 5.33 | 716 |
Original | 86 | 5.13 | 1.54 | 521 |
Moment | — | BPF | 2BPF | 3BPF | Time-Average |
---|---|---|---|---|---|
10KQx × 104 | Improved | 512 | 13.44 | 10.05 | 4086 |
Original | 1018 | 12.36 | 11.33 | 4063 | |
10KQy × 104 | Improved | 632 | 24.15 | 13.31 | 762 |
Original | 628 | 23.22 | 15.27 | 636 | |
10KQz × 104 | Improved | 1148 | 15.21 | 11.69 | 714 |
Original | 1434 | 19.83 | 17.65 | 447 |
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Li, X.; Cai, W.; Ren, N.; Sun, S. The Effect of the Fillets on Submarine Wake Field and Propeller Unsteady Bearing Force. J. Mar. Sci. Eng. 2023, 11, 727. https://doi.org/10.3390/jmse11040727
Li X, Cai W, Ren N, Sun S. The Effect of the Fillets on Submarine Wake Field and Propeller Unsteady Bearing Force. Journal of Marine Science and Engineering. 2023; 11(4):727. https://doi.org/10.3390/jmse11040727
Chicago/Turabian StyleLi, Xiang, Wenyu Cai, Nianxin Ren, and Shuai Sun. 2023. "The Effect of the Fillets on Submarine Wake Field and Propeller Unsteady Bearing Force" Journal of Marine Science and Engineering 11, no. 4: 727. https://doi.org/10.3390/jmse11040727
APA StyleLi, X., Cai, W., Ren, N., & Sun, S. (2023). The Effect of the Fillets on Submarine Wake Field and Propeller Unsteady Bearing Force. Journal of Marine Science and Engineering, 11(4), 727. https://doi.org/10.3390/jmse11040727