Analysis of Mixed Flow Turbofan Engine P M

Analysis of Mixed Flow Turbofan Engine P M V Subbarao Professor Mechanical Engineering Department Facilitates Afterburner & Serves Defense & Space Applications ….

Mixed Flow Turbofan Engine 1 2 3 4 6 h 5 Condition for Ideal Mixing: 6 c 7 8

Ideal & Stable Mixer • Ideal Mixer : Constant Total Pressure Process. • For a stable operation of the mixer, the inlet static pressures of core flow and fan flow must be equal. • If they are not, back flow will occur in either the fan or core. The stagnation pressure ratio across the fan:

Adiabatic Mixer : 6 c+6 h -- 7 Adiabatic mixing process:

Isentropic Nozzle with Mixed Flow : 7 - 8

Velocity of Mixed Jet

The Capacity of Mixed flow Jet Propulsive Power or Thrust Power: Specific Thrust based on total jet flow S

Mixed Flow Turbofan : TSFC

Aviation Appreciation Propulsion Efficiency

Mixed –Flow Fan : Effect of Bypass Ratio r 0 p, comp=15 Mac=0. 75 0, cc=5. 78 Non-dimensional TSFC Non-dimensional Specific Thrust Theory of Mixing:

Subsonic Operation : Mixed Turbo Fan: Mac=0. 75 Bypass Ratio Fan Pressure Ratio Compressor Pressure Ratio

Design Space for Mixed Turbo Fan: Mac=2. 0 Bypass Ratio 2 Fan Pressure Ratio 3 4 5 Compressor Pressure Ratio

Subsonic Operation : Mixed Turbo Fan : Mac=0. 75 Specific Thrust k. N. s/kg Fan Pressure Ratio 2 3 4 5 Compressor Pressure Ratio

Supersonic Operation : Mixed Turbo Fan : Mac=2. 0 Specific Thrust N. s/kg Fan Pressure Ratio 2 3 4 5 Compressor Pressure Ratio

Specific Thrust k. N. s/kg Effect of Mach Number : Mixed Turbo Fan 2: 2. 0 2: 0. 75 4: 2. 0 Compressor Pressure Ratio

Subsonic Operation : Mixed Turbo Fan : Mac=0. 75 TSFC 5 Fan Pressure Ratio 4 3 2 Compressor Pressure Ratio

Supersonic Operation : Mixed Turbo Fan : Mac=2. 0 5 Fan Pressure Ratio 4 TSFC 3 2 Compressor Pressure Ratio

Effect of Mach Number : Mixed Turbo Fan 4 : 2. 0 TSFC 2: 2. 0 Fan Pressure Ratio 4 : 0. 75 2: 0. 75 Compressor Pressure Ratio

5 TSFC 4 3 Fan Pressure Ratio 2 Compressor Pressure Ratio Bypass Ratio TSFC Designs for Better Fuel Economy: Subsonic Flight Compressor Pressure Ratio

HAL Tejas Mark 2: - Advanced Variant of LCA Tejas The Tejas Mark 2 may feature an indigenously developed active electronically scanned array (AESA) fire control radar named Uttam. GE Aviation has handed over two F 414 -GE-INS 6 engines which will eventually power Tejas MK-II by 2020 in Feb 2017. 98 k. N thrust.

TF 30: Pratt and Whitney Mixed Flow Turbofan Engine The TF 30−P− 414 engine is a mixed−flow, dual spool afterburning low−bypass turbofan designed and manufactured by Pratt and Whitney. The engine incorporates a nine−stage low pressure compressor including a three−stage fan driven by a three−stage low pressure turbine; and a 7−stage axial flow high−pressure compressor driven by a single−stage high−pressure turbine.

SPECIFICATIONS: TF 30 • Max Design Pressure Ratio: Fan: 2. 14 to 1 Overall: 19. 8. • Three−stage fan +Nine−stage low pressure compressor driven by a three−stage low pressure turbine; • 7−stage axial flow high−pressure compressor driven by a single−stage high−pressure turbine. • The variable−area exhaust nozzle is hydraulically actuated, 508 to 1080 sq. in • Airflow Capacity: Bypass airflow ratio: 0. 878 to 1 • Max rated airflow: 242. 0 lbs/s • Max rated turbine inlet: 2150 F

F 110 -GE-129 Mixed Flow Turbofan Engine

Details of F 110 -GE-129 : October 2015 • The F 110 -GE-129 engine was selected to power the latest version of the F-15 aircraft ordered by the Republic of Korea. • The first F-15 K took to the skies powered by F 110 engines in March 2005. • Samsung Tech. Win will manufacture in Korea 78 of the 88 engines purchased by the Republic of Korea Air Force (ROKAF) for the F 15 K program.

SPECIFICATIONS: F 110 -GE - 400 • • F 110 -GE-129 Thrust : 129 k. N Airflow : 122. 4 kg/sec Bypass ratio : 0. 76 Max Design Pressure Ratio, SLS: Fan: 3. 2 to 1 Overall: 29. 9 to 1 Airflow Capacity: Max rated airflow: 270. 0 lbs/s

Twin Spool Turbofan Engine

Rolls Royce RB 211 -535 Engine : Three Spool Turbofan Engine

Options for Highest Fuel Economy ropfan, opt TSFC a

PW 1100 G : High Bypass ratio : 12. 5