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Pneumatic anti-ice system

The pneumatic anti-ice system of a vessel is housed in the underwater part of the ship's hull, in order to reduce ice sticking to the hull and thereby improve the ship's mobility when sailing in ice. Modern pneumatic anti-ice systems use compressed air or engine exhaust as the working gas, which is vented overboard through a series of ejectors from bow to the amidships of the vessel. Since the ejectors are located at a depth below the waterline or in the area of the keel of the vessel, the airflow streaming from them forms an anti-icing water-air curtain along the entire underwater part of the hull.[1]

Yermak, the world's first icebreaker with a pneumatic anti-icing system.

History edit

The concept of a ship anti-icing system in the form of a water-air boundary layer was proposed for the first time in 1966 in the USSR, but its initial versions were imperfect due to the location of ejectors only in the bow of the ship and due to insufficient airflow.[2] Variants of a heated steam-air system in the waterline area were also considered, and the prospects for its use as a thruster to increase the maneuverability of ships were also studied.[1] The air washing system in its modern form was proposed by the Finnish company Wärtsilä in 1969 and was first installed on the Finnish cargo ferry Finncarrier, which was tested in the ice of the Baltic Sea in 1970. The first icebreaker on which the pneumatic anti-ice system was installed was the Yermak, built in 1974.[3]

Performance edit

The adhesion of the underwater part of the hull with ice has a thermal and electrostatic nature. Since the ice in its above-water part also has a negative temperature at a negative temperature of the air, when interacting with the hull, the ongoing processes develop too quickly to warm it up to the ambient water temperature, as a result of which it freezes or sticks to the hull. Air flushing reduces the contact area of the ice with the hull and increases the temperature by creating an upstream current of warmer water from a greater depth, thereby solving the first problem. Another mechanism is the accumulation of an electrostatic charge in ice when it cracks and breaks. In the case of an unsatisfactory state of underwater paint coating of the hull, it can become ineffective against the sticking of ice with the accumulated charge.[4]

References edit

  1. ^ a b "Авансы и долги российского ледоколостроения". korabel.ru (in Russian). 28 July 2023. Retrieved 22 July 2009.
  2. ^ Богородский В.В., Гаврало В.П., Недошивин О.А. (13 March 2018). "Разрушение льда. Методы, технические средства. // Ленинград // Гидрометеоиздат // 1983" (PDF). sci-article.ru (in Russian). Retrieved 28 July 2023.{{cite web}}: CS1 maint: multiple names: authors list (link)
  3. ^ "Ермак // Дальтелефильм // Владивосток // 1975". youtube.com (in Russian). Retrieved 28 July 2023.
  4. ^ Степанюк Иван Антонович (13 March 2018). "Эффект облипания ледоколов и транспортных судов при движении во льдах". sci-article.ru (in Russian). Retrieved 28 July 2023.

pneumatic, anti, system, this, article, require, copy, editing, grammar, style, cohesion, tone, spelling, assist, editing, january, 2024, learn, when, remove, this, message, pneumatic, anti, system, vessel, housed, underwater, part, ship, hull, order, reduce, . This article may require copy editing for grammar style cohesion tone or spelling You can assist by editing it January 2024 Learn how and when to remove this message The pneumatic anti ice system of a vessel is housed in the underwater part of the ship s hull in order to reduce ice sticking to the hull and thereby improve the ship s mobility when sailing in ice Modern pneumatic anti ice systems use compressed air or engine exhaust as the working gas which is vented overboard through a series of ejectors from bow to the amidships of the vessel Since the ejectors are located at a depth below the waterline or in the area of the keel of the vessel the airflow streaming from them forms an anti icing water air curtain along the entire underwater part of the hull 1 Yermak the world s first icebreaker with a pneumatic anti icing system History editThe concept of a ship anti icing system in the form of a water air boundary layer was proposed for the first time in 1966 in the USSR but its initial versions were imperfect due to the location of ejectors only in the bow of the ship and due to insufficient airflow 2 Variants of a heated steam air system in the waterline area were also considered and the prospects for its use as a thruster to increase the maneuverability of ships were also studied 1 The air washing system in its modern form was proposed by the Finnish company Wartsila in 1969 and was first installed on the Finnish cargo ferry Finncarrier which was tested in the ice of the Baltic Sea in 1970 The first icebreaker on which the pneumatic anti ice system was installed was the Yermak built in 1974 3 Performance editThe adhesion of the underwater part of the hull with ice has a thermal and electrostatic nature Since the ice in its above water part also has a negative temperature at a negative temperature of the air when interacting with the hull the ongoing processes develop too quickly to warm it up to the ambient water temperature as a result of which it freezes or sticks to the hull Air flushing reduces the contact area of the ice with the hull and increases the temperature by creating an upstream current of warmer water from a greater depth thereby solving the first problem Another mechanism is the accumulation of an electrostatic charge in ice when it cracks and breaks In the case of an unsatisfactory state of underwater paint coating of the hull it can become ineffective against the sticking of ice with the accumulated charge 4 References edit a b Avansy i dolgi rossijskogo ledokolostroeniya korabel ru in Russian 28 July 2023 Retrieved 22 July 2009 Bogorodskij V V Gavralo V P Nedoshivin O A 13 March 2018 Razrushenie lda Metody tehnicheskie sredstva Leningrad Gidrometeoizdat 1983 PDF sci article ru in Russian Retrieved 28 July 2023 a href Template Cite web html title Template Cite web cite web a CS1 maint multiple names authors list link Ermak Daltelefilm Vladivostok 1975 youtube com in Russian Retrieved 28 July 2023 Stepanyuk Ivan Antonovich 13 March 2018 Effekt oblipaniya ledokolov i transportnyh sudov pri dvizhenii vo ldah sci article ru in Russian Retrieved 28 July 2023 Retrieved from https en wikipedia org w index php title Pneumatic anti ice system amp oldid 1207070976, wikipedia, wiki, book, books, library,

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