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Turboprop Engine
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TurbopropEngine
Yadav Khagendra k.M-tech (AME)Hindustan University
Introduction
A turboprop engine is a turbine engine that drives an aircraft propeller.
Propeller -90 percent of the total thrust.
Jet thrust -usually10 percent.
There are two basic types of turboprop engines:
1. Single shaft
2. Free turbine
The propeller is driven by the same shaft (spool) that drives the compressor.
1, Single-shaft turboprop engine
The propeller is driven by a dedicated turbine. A different turbine drives the compressor; this turbine and its compressor run at near-constant RPM regardless of the propeller pitch and speed.
2, Free-turbine turboprop engine
Current enginesmanufacturer Country Application
DEMC China Harbin SH-5, Xi'an Y-7
Europrop International European Union Airbus A400M
General Electric, LHTEC, Honeywell
United States Jetstream, Dornier
Pratt & Whitney Canada ATR, Bombardier, Beechcraft, cessna
KKBM, OMKB, RKBM, Rybinsk, Saturn
Russia Antonov
Progress Ukraine Antonov
PZL Poland PZL M28
Rolls-Royce United Kingdom Lockheed Martin
Turbomeca France Socata TB 31 Omega
Walter Czech Republic Let L-410 Turbolet UVP-E
Why use turboprop
The amount of power available for propulsion is largely independent of the forward speed of the aircraft, so that more power is available during the initial stages of the takeoff run.
A slipstream is produced behind the propeller that improves elevator and rudder control at low speeds.
The engine can be run under more efficient and economical conditions at low and medium altitudes, and retains these two qualities at low aircraft speeds.
Operations can be conducted from shorter runways.
fuel efficient.
Turboprop and Turbofan propulsive efficiency
Comparison of fuel consumption
Fuel consumption per passenger 370km stage length
Pilot salaries and fuel costs
Airline operators are investing more money in pilot salaries and fuel cost in jet engine aircraft as they burn more fuel in comparison to turboprop aircraft.
Airport tax are higher for larger aircraft with high MTOW then the smaller aircraft with low MTOW.
TAX
Operating costs
Bombardier Dash 8
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