ADVANTAGES OF GTE s Weight reduction of 70% Simplicity Reduced manning requirements Quicker response time Faster Acceleration/deceleration Modular rep
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6 USES OF GAS TURBINE ENGINES Aircraft Engines Main Propulsion Arleigh Burke, Tichonderoga, Spruance, Oliver Hazard Perry LCACS, Pegasus Auxiliary Applications Electric generators
7 ADVANTAGES OF GTE s Weight reduction of 70% Simplicity Reduced manning requirements Quicker response time Faster Acceleration/deceleration Modular replacement Cleaner and safer fuels Less vibrations More economical
8 DISADVANTAGES OF GTE s Many parts under high stress High pitched noise Needs large quantities of air Large heat source Must be in-port for major repairs
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12 INTAKE DUCTS Located to prevent ingestion of SW Contains Demisters Intake Heaters Blow-in Doors FOD screen Silencers Separator Pads Allows engine removal
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14 4 COMPONENTS OF A GAS TURBINE ENGINE
15 (1) COMPRESSORS
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17 Radial Flow
18 Axial Flow
19 Axial vs. Radial Axial Adv: simple and inexpensive light weight Dis: less efficient large frontal area limited compression ratio (4:1 ratio) Radial Adv: efficient high compression ratios (20:1) Dis: complex expensive
20 LM 2500 COMPRESSOR Compressor - 16 stage Axial flow 17:1 compression ratio Inlet Guide Vanes 1st 6 Stages of Stator Vanes variable Provides proper air flow for Rotor Vanes
21 COMPRESSOR STALL Occurs if for some reason air velocity decreases without a commensurate decrease in RPM or if RPM increases without the necessary air velocity increase. Similar to wing stall Can result in blade failure
22 GTE AIR Compressed Air Distribution: Primary Air - 30% of the compressed air is supplied directly to the combustion chamber Secondary Air - 65% of the air provides cooling for the combustion chamber Film Cooling Air - 5% of the air provides cooling directly to the turbine blades
23 (2) COMBUSTORS
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29 LM 2500 COMBUSTOR Annular = RING OF FIRE 30 Fuel Nozzles 2 Ignitors Allison 501-K17 (Gas Turbine Generator) CAN ANNULAR - 6 Cans/6 Fuel Nozzles-Ingitors
30 (3) TURBINES
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34 LM 2500 Turbine Section High Pressure Turbine Maintains Compressor Rotation Power Turbine (Low Pressure) 6 sets of nozzles/blades NOT Attached to Compressor Shaft Directly Attached to Power Drive Shaft
35 EXHAUST DUCTS Routes exhaust gases to atmosphere (1200 F) Contains Silencers Like Muffler Exhaust Gas Cooling Air Ejector Nozzles (450 F) Higher than intake Auxiliary Uses: WASTE HEAT BOILER only) Like Economizer Heats water (650 F - Steam)/Cools Exhaust (400 F) (GTG
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38 Operating Principles Shipboard GTEs can be thought of in terms of thermodynamic processes: Steady flow Open cycle Unheated engine Working fluid = air that is compressed in the compressor and combustion chamber Unlike the steam plants and reciprocating engines, the gas turbines operate on the Brayton Cycle.
39 Operating Principles cont d Air is drawn into the compressor where it is compressed and sent to the combustion chamber. Fuel is injected into the combustion chamber where it is ignited by the compression (spark on startup). The gases are directed into the turbine where the thermal energy is converted into work
40 P-V Diagram HEAT P EXPANSION COMPRESSION V
41 Thermodynamic Relationships P1 = Pr1 P2 Pr2 P1= Inlet Pressure P2=Outlet Pressure Pr1= Inlet reduced Pressure Pr2= Outlet reduced Pressure
42 Thermodynamic Relationships Example: T1 = 80 F P1 = atmosphere =14.7 PSIA Compression ration = 17:1 Efficiency = 92.5%
43 Gas Turbine Module A LM2500 engine is encased in a module to provide cooling, noise reduction, shock mounting, and safety CO2 flooding. Modular in design facilitates easy replacement Inlet Duct has louvers and demisters Outlet duct has coolers and silencers
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45 Safety Features High Temperature shutdown Topping governor limits speed to 104% Overspeed trip limits speed to 108%
46 Shafting Components GTE NOT Directly connected to Shafting GTE is connected to reduction gears via clutches = > allowing for the locking of shafts Clutch is Screw Type
47 Shafting Components Controllable Reversible Pitch Propeller - allows for slower speeds and reverse Engines/shaft turn in only one direction Allow engines to work at constant speed LM2500s can not operate at speeds < 5,000 RPM = 11 Kts Indicate Pitch and Turns
48 Why Don t We Use GTEs on all Ships? Some Disadvantages are: inefficient at low speeds large inlet and outlet ducting CBR warfare problems complex shafting (clutches and CRPs) large fuel storage requirements
49 Summary Advantages and disadvantages of GTEs and some of their components The parts and operation of GTEs The different types of GTEs Air distribution Support systems Platforms that use GTEs
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