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Basics of A Turboprop Engine

Basics of A Turboprop Engine. P M V Subbarao Professor Mechanical Engineering Department. Enjoy the flying but pay for road travel ……. Economy Flying. AN 12 : CRUISE SPEED : 520 km/h PAYLOAD : 18000 KG Range: 2400 km Maximum altitude: 7600 m. Requirements of Economic Flying.

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Basics of A Turboprop Engine

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  1. Basics of A Turboprop Engine P M V Subbarao Professor Mechanical Engineering Department Enjoy the flying but pay for road travel ……

  2. Economy Flying AN 12 : CRUISE SPEED : 520 km/h PAYLOAD : 18000 KG Range: 2400 km Maximum altitude: 7600 m

  3. Requirements of Economic Flying • In recent years, interest in highly efficient flight transportation is renewed. • This has spurred investigation into very high bypass ratio fans. • Some economic optimization of turbofan cycle shows a bypass ratio of 100. • The weight of cowl and drag due to the cowl will have high penalty on total cost if bypass ratio is greater than 25. • This led to thinking of high bypass ratio open turbofan engines. • Turboprops.

  4. Philosophy of Fuel Economy

  5. 4 5 6 7 1 2 1’ 3 Turboprop Engine : Just for Fuel Economy p04 =r0p,comp p0∞ = p05 T04= =t0p,comp T0∞ p02=p01= p03 = p0∞ T02=T01 = T03 = T0∞

  6. Three Spool Turboprop Engine VU

  7. JU 1 1 JD Actuator disc theory for Propeller pJD p p pJU VD p0JD VU p0D p0JU p0U

  8. Power Consumed by Propeller The ideal shaft power can be found using the integral energy equation on the control volume:

  9. Shaft Power Balance for Turboprop Law of Turboprop

  10. Propeller (Reaction) Power Propeller work coefficient: • The work coefficient of a propeller depends on compressor pressure ratio and turbine pressure ratio. • The compressor pressure ratio and turbine pressure ratio are two independent design variables for a turboprop.

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