Sawtooth trailing edges of propeller blades as high-frequency noise dampers
Object and purpose of research. This paper explores the potential of sawtooth trailing edges in marine propeller designs, taking waterjet impeller as a case study. Materials and methods. The study analyses a number of foreign publications on sawtooth trailing edge effect upon aeroacoustics of variou...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Krylov State Research Centre
2019-12-01
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| Series: | Труды Крыловского государственного научного центра |
| Subjects: | |
| Online Access: | https://transactions-ksrc.ru/eng/archive/Sawtooth-trailing-edges-of-propeller-blades-as-high-frequency-noise-dampers/ |
| Summary: | Object and purpose of research. This paper explores the potential of sawtooth trailing edges in marine propeller designs, taking waterjet impeller as a case study. Materials and methods. The study analyses a number of foreign publications on sawtooth trailing edge effect upon aeroacoustics of various object, derives principal ratios between geometric parameters of trailing edge that enable efficient damping of high-frequency noise and, last but not least, describes sonar stealth potential of sawtooth trailing edges. Main results. Development and manufacturing of waterjet impeller model with saw-tooth blades. Cavitation, hydro- dynamic and acoustic testing of the model. Conclusion. Model tests have shown that sawtooth trailing edges can efficiently damp high-frequency noise of marine propeller, keeping their hydrodynamic and cavitation performance practically the same. |
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| ISSN: | 2542-2324 2618-8244 |