Gas Turbine Systems for World Navy Ships

Brady, Eugene F.

doi:10.1115/88-gt-166

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…During the last forty years most of Western Navies have begun to utilize aero-derivative gas turbine engines as prime movers for surface combatants due to enhanced performances that could not be attained with diesel engines, Brady (1988). Although the naval community had attempted the use of this type of engines for ship propulsion, it was only after a successful commercial campaign during the 70s that gas turbines were used for naval propulsion systems.…”

Section: Introductionmentioning

confidence: 99%

Gas turbine performance enhancement for naval ship propulsion using wave rotors

Fatsis

2021

Journal of Marine Engineering & Technology

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The propulsion demands of high speed naval vessels often rely on gas turbines fitted in small engine rooms, producing significant amounts of power achieving thus high performance requirements. Gas turbines can be used either to provide purely mechanical propulsion, or alternatively to generate electricity, which is subsequently used by electric drives to propel the ship. However, the thermal efficiencies of gas turbines are lower than those of Diesel engines of similar power, in addition to the fact that all gas turbines are less efficient as the ambient temperature rises, particularly for aero-derivative engines. In the context of improving the performance of existing marine gas turbines with minimum modifications to their baseline configuration, this article is proposing engine's performance enhancement by integrating a pressure wave supercharger (or wave rotor), while keeping the compressor, combustion chamber and turbine entry temperature of the baseline engine unchanged. Thermodynamic cycle analysis for two-shaft gas turbine engines configurations with and without heat exchanger to recuperate the waste heat from the exhaust gases, typical for marine propulsion is performed for the baseline engines, as well as for the topped with four-port wave rotor engines, at design point conditions and their performances are compared accordingly. Important benefits are obtained for four-port wave rotor-topped engines in comparison to the self-standing baseline engines for the whole range of engine's operation. It is found that the higher the turbine inlet temperature is, the more the benefit gain of the wave rotor topped engine is attained in terms of efficiency and specific power. It is also concluded that the integration of wave rotor particularly favours engines operating at low compressor pressure ratios and high turbine inlet temperatures. The effect of variation of the most important parameters on performance of the topped engine is investigated. It is concluded that wave rotor topping of marine gas turbines can lead to fuel savings and power increase.

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Section: Introductionmentioning

confidence: 99%

Gas turbine performance enhancement for naval ship propulsion using wave rotors

Fatsis

2021

Journal of Marine Engineering & Technology

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Main Propulsion Arrangement and Power Generation Concepts

Stapersma

2017

Encyclopedia of Maritime and Offshore Engineering

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An overview is given of mechanical, electrical and hybrid propulsion arrangements. The relation between propulsion concepts and power generation is explained and elaborated in energy flow diagrams. A general procedure for analyzing propulsion and power generation concepts is presented, using energy conversion effectiveness and based upon a selection of operational modes and a mission profile reflecting the use of those modes. Potential matching problems when switching between propulsion modes are identified and possible solutions given.

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Gas Turbine Systems for World Navy Ships

Cited by 2 publications

References 4 publications

Gas turbine performance enhancement for naval ship propulsion using wave rotors

Gas turbine performance enhancement for naval ship propulsion using wave rotors

Main Propulsion Arrangement and Power Generation Concepts

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