Distinctive Features of Using the Propulsor of the Underwater Sail Type the Direct-Flow Wave Propulsor on a Semisubmerged Catamaran

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We present the results of experimental investigations of the efficiency of the direct flow wave propulsor and the propulsor of the underwater sail type on the models of semisubmerged catamaran boat with a small area of the section along the waterline. The effects observable in the case of the propulsor of the underwater sail type are qualitatively the same as for the previously studied swinging wing, namely, the greatest efficiency is observable, when the propulsor is situated near the free surface, while its efficiency is rapidly reduced with propulsor immersion. The propulsor efficiency varies only slightly with ship hull immersion, whereas the working frequencies are considerably reduced as compared with those of floating structures. In this case, the working frequencies vary in proportion to the model boat scale. Comprehensive studies of the direct-flow wave propulsor efficiency were performed, an inclined flat plate being fixed at the hulls of a semisubmerged ship as a working element. The optimal parameters of the propulsor were noted, when it efficiently operates on the waves with the greatest steepness (storm waves). Experiments showed that the efficiency of the wave propulsors of the swinging wing or underwater sail types in their operation ranges is somewhat higher than that of the direct-flow propulsor. However, under the rough water conditions the direct-flow propulsor has its own advantages, since precisely in this case it demonstrates its greatest efficiency, while the other versions considered are efficacious in the wavelength range dependent on the ship length and, generally speaking, do not coincide with the storm wave length.

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E. Arkhangelsky

Lomonosov Moscow State University

Email: vlad.prokof@yandex.ru
俄罗斯联邦, Moscow

A. Boyko

Lomonosov Moscow State University

Email: mailband@mail.ru
俄罗斯联邦, Moscow

V. Prokofyev

Lomonosov Moscow State University

编辑信件的主要联系方式.
Email: vlad.prokof@yandex.ru
俄罗斯联邦, Moscow

参考

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  2. Прокофьев В.В., Такмазьян А.К., Филатов Е.В. Результаты испытаний судна с различными волновыми движителями в гидроканале // Изв. РАН МЖГ. 2019. № 6. C. 38–47
  3. Прокофьев В.В., Архангельский Е.А., Бойко А.В. Использование волновых движителей на судне с малой площадью ватерлинии // Изв. РАН МЖГ. 2023. №1. C. 41–53.
  4. Дубровский В.А, Главное о судах с малой площадью ватерлинии // Тр. Крыловского государственного научного центра. 2021. т. 3. № 397. C. 75–82
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2. Fig. 1. Dependence of the wave height Hw on the frequency of operation of the wedge-shaped wavemaker, dotted and red lines - approximations of the 3rd and 2nd modes of wave generation by polynomials. A grid of lines of constant wave steepness at a depth of 950 mm is plotted (thin lines, numbers near the curves - values of wave steepness). 1 - maximum amplitude of wedge rolling, 2, 3 - average and minimum amplitude, respectively.

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3. Fig. 2. Scheme of the model: 1 - plastic housing-pontoons, 2 - upper platform of the model, 3 - elliptical section stands, H1 - height of pylons, D1 - distance between centres of pontoons, H1 - height of the flow part plate, D2 - distance between plates.

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4. Fig. 3. Dependence of mean velocity on wave frequencies when changing the vessel's draft H.

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5. Fig. 4. Dependence of average velocity on wave frequencies at 720 mm draught of the vessel when changing the depth of the propulsor burial H.

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6. Fig. 5. Dependence of the ship's rocking Hs on wave frequencies at the ship's draught of 710 mm. when changing the depth of immersion of the sail attachment sleeve H. Sleeve immersion depth 50, 0, 300 mm (1-3). 4 - wave height at max amplitude of EP operation.

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7. Fig. 6. Comparison of the model speed against waves for three different types of UA with approximately the same working element area and close ship drafts: 1 - underwater sail, 2 - rigid profile NACA-0015 (both buried by 50 mm), 3 - straight-through UA (with a fixed profile chord slope of 30°).

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8. Fig. 7. Dependence of the speed of a vessel with an underwater sail on the total tension force of the threads: 50, 100, 200, 300 grams of force (1-4).

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9. Fig. 8. Test results of underwater sail-type UA and PVD on semi-submersible ship models of different scales on the same waves. Small model with propulsor immersion 55 mm and hull draft 340, 460 mm (1, 2), large model with propulsor immersion 50 mm, draft 433, 720 mm (3, 4), small model with PVD, plate length 100, 300 mm (5, 6).

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10. Fig. 9. Dependences of velocity on wave frequency at different wave heights. 1 - min, 2 - mid, 3 - max.

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11. Fig. 10. Dependence of vessel speed against waves on the plate length. Yellow marks - mode of wavemaker operation max, plate length 100, 200, 300 mm (1-3), blue marks - min, length 100, 140, 300 mm (4-6).

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12. Fig. 11. Dependence of velocity on wave frequency for a 100 mm long plate at different plate inclination angles: 15°, 30°, 45°, 60°, 90° (1-5).

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13. Fig. 12. Dependence of velocity on wave frequency for plates with the same position of the upper edge (0 mm) and buried lower edge (70 mm) at different plate inclination angles: 20°, 30°, 45°, 60° (1-4).

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