Combined gas and gas

Двухтурбинная одновальная морская силовая установка

Principle of a COGAG propulsion system

Combined gas turbine and gas turbine (COGAG) is a type of propulsion system for ships using two gas turbines connected to a single propeller shaft. A gearbox and clutches allow either of the turbines to drive the shaft or both of them combined. Marine usage of COGAG systems are similar to those found ashore.^[1]

Description

A COGAG system consists of two gas turbines, each connected to a reduction gearbox. These are each attached to a coupling with both connected to larger gearbox and then to the ship's propeller.^[2]

Advantages and disadvantages

Advantages of the system include a large degree of automation along with quick startup time, they are easier to silence and protect from shock.^[3] Compared to combined diesel and gas (CODAG) or combined diesel or gas (CODOG), COGAG systems have a smaller footprint but a much lower fuel efficiency at cruise speed and for CODAG systems it is also somewhat lower for high speed dashes.^[4] Issues with COGAG systems include their complexity and gearbox issues and high fuel use.^[5]

List of COGAG ships

• Kolkata-class guided-missile destroyer (Indian Navy)
• INS Vikrant (aircraft carrier) (Indian Navy)
• Type 22 frigate (Batch 3) (Royal Navy)
• Invincible-class aircraft carrier (Royal Navy)
• Cavour-class aircraft carrier (Italian Navy)
• Asagiri-class destroyer (Japan Maritime Self-Defense Force), and subsequent destroyer classes
• Hyūga-class helicopter destroyer (Japan Maritime Self-Defense Force), helicopter carrier
• Izumo-class helicopter destroyer (Japan Maritime Self-Defense Force), helicopter carrier
• Type 055 destroyer (People's Liberation Army Navy)
• Neustrashimy-class frigate (Russian Navy)
• Sejong the Great-class destroyer (Republic of Korea Navy)
• Skjold-class corvette (Royal Norwegian Navy)
• Эсминец класса Arleigh Burke ( ВМС США )
• Крейсер типа «Тикондерога» (ВМС США)
• Десантный корабль класса Wasp (ВМС США)

Цитаты

1. Соарес 2015, стр. 10, 27.
2. Плафф 2021, с. 95.
3. Грейвс и Карлтон 1963, с. 12.
4. Соарес 2015, с. 31.
5. Плафф 2021, с. 92.

Рекомендации

• Грейвс, Г.Л.; Карлтон, RS (сентябрь 1963 г.). «Газовые турбины для нетрадиционных судов». Журнал Бюро кораблей . 12 (9): 7–12.
• Плафф, Манфред (2021). Технология эксплуатации судов: Справочник и руководство . Висбаден, Германия: Springer Fachmedien. ISBN 978-3-658-32729-3.
• Соарес, Клэр (2015) [2008]. Газовые турбины: Справочник по применению в воздухе, на суше и на море (второе изд.). Кидлингтон, Оксфорд: Эльзевир. ISBN 978-0-12-410461-7.