Performance Characteristics of Turbo Jet Engines

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Presentation transcript:

Performance Characteristics of Turbo Jet Engines P M V Subbarao Professor Mechanical Engineering Department Enhanced Life at The Thrust generator Inlet….

Turbojet engine :Turbine as A Slave to Drive Compressor Vac Vjet

Sizing of Turbine : Just Enough Power 4 5 T C 2 3 Duty of the Turbine is to drive the compressor : just enough power. Enhanced vigor of Jet:

Remaining Life & Energy of Jet

Life Infusion Vs Life Loss Turbojet feasibility condition:

The Thrust Generator with better Inlet Conditions Isentropic Expansion in a Passive Device (Nozzle)

Thermodynamic SSSF model for Nozzle

Subsonic Vs Supersonic Turbojet Engine For subsonic engine: For supersonic engine:

The velocity of Turbojet

Generation of Thrust : The Capacity

Specific Thrust S

Thrust Specific Fuel Consumption TSFC Propulsive Power or Thrust Power:

Aviation Appreciation Propulsion Efficiency

Thermodynamic Appreciation Thermodynamic Efficiency

Global Appreciation of Turbojet Engine

Turbojet engine Is it a wise Model???

Performance of a Ideal Turbojet Engine @ Variable Mach Number r0p,comp = 10 0,cc=4.5 S TSFC kg/ kN.hr Specific Thrust kN.s/kg TSFC Mac

Parametric Cycle Analysis of Ideal Turbo Jet Engine Selection of Safe Cruising Conditions….

Effect of Flight Mach Number on Compactness 0,cc=4.5 r0p=20 r0p=30 r0p=10 r0p=5 r0p=3 r0p=2 r0p=1 Specific Thrust kN.s/kg Mac

Effect of Pressure Ratio on Compactness Mac=0 0,cc=4.5 Mac=0.5 Mac=1.0 Mac=1.5 Mac=2.0 Specific Thrust kN.s/kg Mac=2.5 Mac=3.0 r0p

Effect of Flight Mach Number on Fuel Air Ratio 0,cc=4.5 r0p,comp 1 2 3 5 10 20 30 Mac

Effect of Pressure Ratio on Fuel Air Ratio t0,cc=4.5 rp

Effect of Flight Mach Number on Fuel Economy 0,cc=4.5 r0p=1 r0p=2 r0p=3 TSFC kg/ kN.hr r0p=5 r0p=10 r0p=20 r0p=30 Mac

Effect of Pressure Ratio on Fuel Economy 0,cc=4.5 TSFC kg/ kN.hr Mac rp

Effect of Flight Mach Number on Propulsion Efficiency 0,cc=4.5 r0p = 30 r0p =2 r0p = 5 Mac

Effect of Flight Mach Number on Thermal Efficiency 0,cc=4.5 r0p r0p =30 r0p =5 r0p =2 Mac

Effect of Flight Mach Number on Overall Efficiency 0,cc=4.5 r0p =30 hO r0p =5 r0p =2 r0p Mac

Major Drawback in Turbojet Mac=0 0,cc=4.5 Mac=0.5 Mac=1.0 Mac=1.5 Mac=2.0 Specific Thrust kN.s/kg Mac=2.5 Mac=3.0 r0p

Turbo Jet with Afterburner inlet 1 2 7 5 3 6 4