Second Generation Gas-turbine Engines: Discussion of Turbofan Engines

Released on by Hsiao Ling
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  • Second Generation Gas-turbine Engines: Discussion of Turbofan Engines Book Detail

  • Author : Hsiao Ling
  • Release Date : 1968
  • Publisher :
  • Genre :
  • Pages : 11
  • ISBN 13 :
  • File Size : 35,35 MB
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Second Generation Gas-turbine Engines: Discussion of Turbofan Engines by Hsiao Ling PDF Summary

Book Description: Turbojet aircraft fly at a speed exceeding 2000 km/hr and have a higher rate of fuel consumption. Mig-15 and Tu-104 aircraft powered by turbojet engines have a fuel consumption rate of 0.8-1.0 kg per 1-kg thrust per hr. Turboprop engines were developed for the purpose of fuel economy. Turboprop engines have similar construction and operate on the same principle as a turbojet engine. The only difference in a turboprop engine is the addition of a propeller outside the compressor. Turboprop engines are built for long-range civil transport airplanes flying at a speed of 800-900 km/hr. Turboprop engines can also be used in military aircraft having a flying speed of 4-4.5 mach if an afterburner is added. Tests showed that the fuel consumption of turboprop engines is reduced 16-20% under the same internal flow condition. Takeoff thrust is also increased 30-40% and engine noise is reduced 10-15 db. Turboprop engines, however, are more complicated in construction, heavier, and larger in diameter (30-40%) than turbojet engines. More than 40 types of turboprop engines have been developed recently. A small turboprop engine capable of producing a thrust of only 300 kg is in process of development. A large turboprop engine having a thrust of 9000-10000 kg and a fuel consumption rate of 0.51-0.54 kg per 1-kg thrust per hr has been developed. Middle-range Tu-124 passenger airplanes powered by turboprop engines have a fuel consumption rate 15-25% lower than Tu-104 airplanes. (Author).

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