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ANALYSIS OF CHARACTERISTICS OF REVERSE RUNNING BY MEANS OF CONTROLLABLE PITCH PROPELLERS OF VARIOUS MARINE GAS TURBINE PLANTS

Characteristics of reverse running by means of controllable pitch propellers (CPP) of various marine gas turbine plants were investigated, and the effect of reverse running in general and when turning propeller blades over the zero pitch position at the full speed ahead or full speed reverse positions were analyzed. The analysis referred to a standard 10,000 hp gas turbine plant with an initial combustion chamber temperature of 800 degrees C and a four-bladed propeller with blades turning 35-40 degrees at a 5 degree/sec rate. From five investigated turbine plants, the unit with high and low pressure turbines driving the high and low pressure compressors with an independent intermediate pressure turbine as the power showed a maximum dynamic overspeed of the engine shaft of 19 percent. An analysis of the torque acting on the CPP-blades in reverse revealed that hydrodynamic forces usually tend to turn the blade in the reverse position and centrifugal forces, in zero pitch position. At up to 350 rpm, the moments of centrifugal forces are considerably below the hydrodynamic moments. The turbine reversing time was found to be nearly equal to the CPP-blade turning time when reversing over the flow direction position of the blade.

  • Authors:
    • Kotlyar IV
    • Nakhamkin, M Z
  • Publication Date: 1968

Media Info

  • Pagination: p. 58-62
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00014939
  • Record Type: Publication
  • Source Agency: Joint Publications Research Service
  • Files: TRIS
  • Created Date: May 7 1973 12:00AM