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The Pratt And Whitney F135 Jet Engine

1157 words - 5 pages

With my paper on aircraft engines, I decided to write on the Pratt and Whitney F-135 turbo jet engine. In this paper I am going to discuss the power capabilities of the engine. What it can and not do in reference to its performance. I am also going to talk about who makes the particular engine and what it has to do with the government. And finally, I am going to bring up which aircraft it is being used on and where the idea came from in the first place.
The Pratt and Whitney aircraft company has been a long standing company in the aviation field. About two years ago or so they came out with the F-135 engine for use in the F-35 Joint Strike Fighter. Figure 1 www.militaryparitet.com F-135
Pictured above is the F-135 Pratt and Whitney engine getting ready to be loaded into the aft fuselage of the F-35 Joint Strike Fighter aircraft. This particular engine has the same basic stages as any other jet engine. Which are the intake section, compression section, combustion section, and finally the exhaust section. Each one of these sections has their own responsibility and plays a big role in performance for the aircraft.
Pratt & Whitney F135-PW-100 Augmented Turbofan
• Type: Dual shaft turbofan with low bypass ratio and afterburning
• Bypass Ratio: 0.2:1
• Low Pressure Compressor: Three stage fan
• High Pressure Compressor: 6 stage axial flow compressor
• Burner: Annular, through flow "float wall" combustor
• Turbine: Dual spool counter-rotating, single stage axial high pressure turbine, single stage axial low pressure turbine
• Exhaust: Converging afterburning jet pipe, variable area divergent secondary nozzle, with 3 bearing swivel arrangement.
• Thrust Rating: 40,000 lbs. thrust class with afterburner
• Maximum military power (no afterburner): Approximately 30,000 lbs. of thrust
• Weight: 3,750 lbs.
• Thrust/weight: 10.5:1
• Air mass flow: Approximately 200 lbs/sec
• Overall Pressure Ratio: Approximately 30:1
• Maximum Turbine Inlet Temperature: 2,800 F+
• Specific Fuel Consumption: .70 lb/lbt/hr (dry), 2.0 lb/lbt/hr (with afterburner) (TurboKart.com).
Straight from the Turbo Kart website I found the specifications for the F-135 jet engine. They go over in detail what the capabilities of the F-135 engine can do. This specific engine was made for the use in the F-35 fighter jet program. Lockheed Martin wanted to make sure it had all the necessary equipment needed in order to perform up to standards. With recent development however the F-35 project has been put on hold due to engine issues. On February 19, 2013 the entire fleet of F-35's that had been produced were grounded because of a crack in the first stage fan blade of the engine (Clark, 2013). The latest word then was a low pressure turbine blade had cracked. They sent the engine to Pratt and Whitney's main facility to be look at for investigation of the engine (Clark, 2013). Figure 2 Pictured above is two F-35 Joint Strike Fighters.
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