and better acceleration performance, but it lacks the simplicity of the ramjet because it still involves a shaſt -driven pump. The gas-augmented waterjet has the
potential advantage of increased power density without increased weight, not accounting for the addition of a compressor in the hull. Gas augmentation could also be used to add thrust boost capacity for an existing waterjet, allowing the main waterjet to be smaller and possibly more effi cient for normal operations. As Gowing noted, even if the effi ciency
is not as high as the primary propulsor, a thrust-augmenting device might be an attractive alternative to increasing the primary pump size for short-duration peak thrust requirements. Application of boost thrust might include over-coming the added resistance for transitioning to planning mode on a planning boat, for example. Gowing said early work on two-phase jets focused on energy transfer from the
GE gas turbines for FREMM frigate
GE Marine reports that the fi rst frigate of the Italian-French FREMM programme, Aquitaine, was recently launched at DCNS’ shipyard in Lorient, France. The ship is powered by the GE LM2500+G4 gas turbine-based propulsion system. Aquitaine sea trials were successfully completed in May 2011. Construction continues on the fi rst Italian Navy FREMM Bergamini, with initial start of the LM2500+G4 gas turbine propulsion system expected within the next few months.
“FREMM is one of the most important marine programmes in Europe,” said Brien Bolsinger, GE Marine general manager. “GE expects to provide 10 LM2500+G4 gas turbines to the Italian Navy, 17 to the French Navy and one to the Moroccan Navy for the FREMM programme.” FREMM marks the initial application in the marine sector for the LM2500+G4 aeroderivative gas turbine, which has 11% more power with respect to the previous model and the best overall power density available. The LM2500+G4 benefi ts from the high level of reliability and in-service experience gained with its predecessor, the LM2500, which has logged more than 13 million hours in marine service. The LM2500+G4 gas turbine incorporates proven technology enhancements derived from the latest generation of commercial and military aircraft engines.
Forward Features
January 2012 • Aircraft carriers
• Energy generation & storage • Naval classifi cation • Scandinavian/Nordic Navies
For further information contact: John Payten
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Fax: +44 (0) 20 7245 6959 Email:
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Warship Technology October 2011
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