Prediction of Self-Propulsion Performance of Ship Model with Double L-Type Podded Propulsors and Conversion Method for Full-Scale Ship
Abstract
:1. Introduction
2. Materials and Methods
2.1. Model Parameters for Ship Model Self-Propulsion Performance Estimation
2.2. Boundary Conditions and Hull Meshing for Ship Model Self-Propulsion Performance Estimation
2.3. Calculation Results for Ship Model Self-Propulsion Performance
2.4. Methods for Performance Prediction of Full-Scale Podded Propulsors
2.4.1. Resistances of the Pod Hull and Bracket
2.4.2. Interference Resistance of the Pod Hull and Bracket
2.4.3. Additional Flow Resistance Caused by Wake Flow
2.5. Performance Conversion Method for A Full-Scale Ship with Double L-Type Podded Propulsors
3. Results and Discussion
3.1. Conversion of Self-Propulsion Performance for Full-Scale Double L-Type Podded Propeller
3.2. Numerical Calculation of the Self-Propulsion Performance for a Full-Scale Ship with Double Podded Propulsors
4. Conclusions
- (1)
- The influence of dead wood on the wake flow at the stern of the ship improves the performance of the podded propeller.
- (2)
- The calculation results for the full-scale case indicate that the conversion method for the self-propelled double pods is feasible to some extent.
- (3)
- The Reynolds numbers of the full scale and model scale podded propulsors are quite different, resulting in a significant difference in the thicknesses of the boundary layer and dissimilarity of the flow fields near the wall.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Parameter | Value |
---|---|
Length overall Loa (m) | 122.5 |
Length between perpendiculars Lpp (m) | 117.0 |
Molded breadth B (m) | 22 |
Molded depth D (m) | 11.8 |
Design draught T (m) | 8.0 |
Wetted surface area S (m2) | 350 |
Contracted scale | 17.708 |
Parameter | Value |
---|---|
Bracket angle (°) | 60 |
Overall length of the pod (m) | 0.473 |
Maximum radius of the pod (m) | 0.049 |
Number of blades | 4 |
Diameter of propeller (m) | 0.240 |
Pitch ratio (0.7 R) | 1.284 |
Number of Grid Cells (×10,000) | Value of y+ max | Resistance Value (KN) | |
---|---|---|---|
1 | 112 | 764 | 50.583 |
2 | 156 | 585 | 41.857 |
3 | 220 | 432 | 35.285 |
4 | 345 | 224 | 33.852 |
5 | 552 | 119 | 33.322 |
6 | 753 | 78 | 33.315 |
VS | NS | TS | QS | PE | PDS | |
(kn) | (rps) | (rpm) | (KN) | (KNm) | (KW) | (KW) |
4 | 0.543 | 32.586 | 49.182 | 17.880 | 70.323 | 61.015 |
6 | 0.876 | 52.547 | 120.237 | 49.355 | 263.170 | 271.583 |
8 | 1.089 | 65.331 | 185.010 | 76.753 | 533.352 | 525.099 |
10 | 1.306 | 78.374 | 267.041 | 111.881 | 953.825 | 918.241 |
12 | 1.594 | 95.635 | 395.021 | 163.862 | 1676.243 | 1641.060 |
14 | 1.945 | 116.710 | 588.609 | 243.019 | 2918.287 | 2970.138 |
16 | 2.299 | 137.957 | 818.460 | 345.813 | 4979.976 | 4995.888 |
18 | 2.780 | 166.790 | 1201.100 | 480.019 | 8250.330 | 8384.083 |
VS | KTS/JS2 | JS | tS | ωS | ηPs | ηHs |
(kn) | ||||||
4 | 0.9297 | 0.711 | 0.305 | 0.2252 | 0.647 | 0.897 |
6 | 0.9249 | 0.712 | 0.290 | 0.1930 | 0.567 | 0.879 |
8 | 0.9145 | 0.714 | 0.299 | 0.2305 | 0.569 | 0.911 |
10 | 0.9211 | 0.713 | 0.305 | 0.2542 | 0.568 | 0.932 |
12 | 0.9064 | 0.716 | 0.312 | 0.2447 | 0.571 | 0.911 |
14 | 0.9074 | 0.716 | 0.311 | 0.2186 | 0.571 | 0.882 |
16 | 0.8967 | 0.718 | 0.260 | 0.1805 | 0.573 | 0.903 |
18 | 0.906 | 0.716 | 0.258 | 0.1360 | 0.571 | 0.859 |
VS | ηRs | ηUs | NT | PDT | ||
(kn) | (rps) | (rpm) | (KW) | (hp) | ||
4 | 0.994 | 0.576 | 0.543 | 32.586 | 61.015 | 83.013 |
6 | 0.971 | 0.485 | 0.876 | 52.547 | 271.583 | 369.501 |
8 | 0.979 | 0.508 | 1.089 | 65.331 | 525.099 | 714.420 |
10 | 0.980 | 0.519 | 1.306 | 78.374 | 918.241 | 1249.307 |
12 | 0.982 | 0.511 | 1.594 | 95.635 | 1641.060 | 2232.735 |
14 | 0.976 | 0.491 | 1.945 | 116.710 | 2970.138 | 4041.005 |
16 | 0.963 | 0.498 | 2.299 | 137.957 | 4995.888 | 6797.126 |
18 | 1.002 | 0.492 | 2.780 | 166.790 | 8384.083 | 11,406.915 |
Number of Grid Cells (×10,000) | Value of y+ max | Resistance Value (KN) | |
---|---|---|---|
1 | 1000 | 628 | 178.952 |
2 | 1200 | 573 | 206.324 |
3 | 1500 | 381 | 237.561 |
4 | 1980 | 234 | 256.853 |
5 | 2200 | 112 | 265.385 |
Rs (KN) | Ns (rps) | Ts (KN) | Qs (KNm) | |
---|---|---|---|---|
Cal-Real | 256.853 | 1.555 | 341.218 | 142.450 |
EXP-Model | 271.715 | 1.594 | 395.021 | 163.863 |
ε/% | 5.79 | 2.51 | 15.77 | 15.03 |
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Zhao, D.; Guo, C.; Lin, J.; Zhang, Z.; Bai, X. Prediction of Self-Propulsion Performance of Ship Model with Double L-Type Podded Propulsors and Conversion Method for Full-Scale Ship. J. Mar. Sci. Eng. 2019, 7, 162. https://doi.org/10.3390/jmse7050162
Zhao D, Guo C, Lin J, Zhang Z, Bai X. Prediction of Self-Propulsion Performance of Ship Model with Double L-Type Podded Propulsors and Conversion Method for Full-Scale Ship. Journal of Marine Science and Engineering. 2019; 7(5):162. https://doi.org/10.3390/jmse7050162
Chicago/Turabian StyleZhao, Dagang, Chunyu Guo, Jianfeng Lin, Zuotian Zhang, and Xue Bai. 2019. "Prediction of Self-Propulsion Performance of Ship Model with Double L-Type Podded Propulsors and Conversion Method for Full-Scale Ship" Journal of Marine Science and Engineering 7, no. 5: 162. https://doi.org/10.3390/jmse7050162
APA StyleZhao, D., Guo, C., Lin, J., Zhang, Z., & Bai, X. (2019). Prediction of Self-Propulsion Performance of Ship Model with Double L-Type Podded Propulsors and Conversion Method for Full-Scale Ship. Journal of Marine Science and Engineering, 7(5), 162. https://doi.org/10.3390/jmse7050162