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Efficient Fans, Compressors & Turbines for Jet Engines by Prof. P.M.V. Subbarao

Understanding the principles and design practices of axial flow turbo-machines for optimal performance in aircraft propulsion systems. Learn about the kinematics, thermodynamics, and power consumption of fans, compressors, and turbines.

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Efficient Fans, Compressors & Turbines for Jet Engines by Prof. P.M.V. Subbarao

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  1. Fans, Compressors & Turbines for Jet Engines P M V Subbarao Professor Mechanical Engineering Department Life Management Systems for A Flying Machine.

  2. Fans & Compressors

  3. Euler Turbo-machine Equation Vwhirl, out Vwhirl, in Applying conservation of angular momentum, the torque, T, must be equal to the time rate of change of angular momentum in a stream tube that flows through the device

  4. Axial Flow Turbo-machines Fan or compressor Rotor Blades The power, P of a fluid Machine

  5. Action & Reaction • If the tangential velocity increases across a moving blade then work is added to the flow ( a fan or a compressor). • If the tangential velocity decreases across a moving blade then work is removed from the flow (a turbine).

  6. Classification of Fans & Compressors Positive Displacement of Compressors Roto-dynamic Compressors Reciprocating Compressors Rotory Compressors Centrifugal Compressors Hybrid Compressors Axial Compressors

  7. Multistage Axial flow fans & Compressors

  8. Schematic representation of a multi stage axial flow compressor

  9. Need for a Stator in multi-stage fan or compressor In general, a rotor also adds kinetic energy along with enthalpy to the fluid. A diffuser known as stator succeed the rotor to convert the excess kinetic energy into enthalpy.

  10. p02 = p03 T02 = T03 p3 V32/cp V22/cp p2 T01 p01 V12/cp T1 p1 Thermodynamics of An Ideal Axial flow fan/Compressor Stage T s

  11. Euler’s Action behind the increase in Enthalpy of Air

  12. Inlet Velocity Triangle Outlet Velocity Triangle Mean Stream line Kinematics of An Ideal Axial Flow fan/ Compressor Stage

  13. Inlet Velocity Triangle Outlet Velocity Triangle Kinetics of An Axial Flow Fan/Compressor Stage Rate of Change of Momentum: Power Consumed by an Ideal Moving Blade Current Design Practice:

  14. Inlet Velocity Triangle Outlet Velocity Triangle Energy Analysis of An Axial Flow Fan /Compressor Stage Change in Enthalpy of fluid in moving blades:

  15. Isentropic compression in A Rotor Blade Level of Compression in A Rotor Power consumed by an ideal rotor : Power absorbed by fluid in a rotor : First law for relative flow through moving blades: Degree of Reaction of A Stage

  16. Total Effect by an isentropic Stage of a Fan /compressor:

  17. Irreversible Adiabatic Stage of an Axial Flow Fan/Compressor Rotor Losses Total Losses T03=T02 T01 p03s=p02s p02 p03 T02s T03s T p01 s

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