Combined gas and gas

Principe d'un système de propulsion COGAG.

Combined gas turbine and gas turbine (COGAG) sont un type de système de propulsion pour les navires utilisant deux turbines à gaz reliées à un seul arbre d'hélice. Une boîte de vitesses et des embrayages permettent à l'une des turbines d'entraîner l'arbre ou les deux combinés.

L'utilisation d'une ou deux turbines à gaz présente l'avantage d'avoir deux réglages de puissance différents. Étant donné que le rendement énergétique d'une turbine à gaz est le meilleur près de son niveau de puissance maximale, une petite turbine à gaz fonctionnant à pleine puissance est plus efficace par rapport à une turbine deux fois plus puissante fonctionnant à mi-puissance, permettant un transit plus économique à des vitesses de croisière.

Par rapport au Combined diesel and gas (CODAG) ou Combined diesel or gas (CODOG), les systèmes COGAG ont une empreinte plus petite mais un rendement énergétique beaucoup plus faible à la vitesse de croisière et pour les systèmes CODAG, il est également un peu inférieur pour les vitesses de pointe.

Liste des navires COGAG

Notes et références

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