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LM2500 Marine Gas Turbine
LM2500 marine gas turbine is a simple-cycle, two-shaft, high-performance engine. Derived from GEs TF39 and CF6-6 aircraft engines,the LM2500 consists of a gas generator, a power turbine, attached fuel and lube oil pumps, a fuel control and speed governing system, associated inlet and exhaust sections, lube and scavenge systems as well as controls and devices for starting and monitoring engine operation. The LM2500 has four major components a16stage, 18:1 pressure ratio-compressor with seven stages of variable stators and inlet guide vanes;a fully annular combustor with externally mounted fuel nozzles; a two stage, air-cooled high-pressure turbine which drives the compressor and the accessory-drive gearbox; and a six-stage, aerodynamically coupled, low-pressure power turbine which is driven by the gas generators high-energy exhaust gas flow.
Easy to install and maintain, the LM2500 features the following: a simple modular design, marine corrosion-resistant materials and minimum size, weight and space requirements per horsepower. The LM2500 delivers high thermal efficiency and low fuel and airflow per horsepower.The LM2500 marine gas turbine is frequently housed in a high-shockresistant, thermal, acoustic enclosure and mounting base. The enclosure attenuates noise in the engine room and provides sensors for inlet icing and fire detection. It also houses fire extinguishing equipment. GE furnishes these modules for the United States Navy and other navies. The modules can be equipped with either resilient shock mounts or hard mounts. Resilient shock mounts not only provide mechanical safeguards, they also are important for absorbing structure-borne noises and reducing the ships noise signature.
Pre-wired, pre-piped and factory tested for easy installation, the LM2500 module weighs just 48,000 pounds (22,000 kg) with shock mounts and45,500 pounds (20,639 kg) without. It requires only 324 x 108 x 120 cubicinches of ship space (27 x 9 x 10 feet) (8.23 x 2.74 x 3.05 m). The inletduct flow area is 48 square feet and the exhaust duct flow area is36 square feet (3.34 sq m).
The simple modular design of the LM2500 incorporates many features which maximize shipboard maintainability and minimize parts replacement downtime, such as a split compressor casing, in-place blade and vane replacement, in-place hot section maintenance and accessible external fuel nozzles.
Performance-output 33,600 shp (25,060 kW)
SFC .373 lb/shp-hr
Heat rate 6,860 Btu/shp-hr
9,200 Btu/kWs-hr
9,705 kJ/kWs-hr
Exhaust gas flow 155 lb/sec (70.5 kg/sec)
Exhaust gas temperature 1,051°F (566°C)
Power turbine speed 3600 rpm
Average performance, 60 Hz, 59°F, sea level, 60% relative humidity,
no inlet/exhaust losses
Four LM2500 Marine Gas turbines will power IAC 1
