In conditions of propeller-speed reversal, such as occur when the ship has to be stopped in an emergency, the propulsive turbine installation may be subjected to severe or unusual loads which cannot be reproduced in ordinary test beds. The reason for this is that the hydraulic brake used in the test beds cannot imitate the torque variation imposed on the propulsive system by an actual propeller in transient conditions. To overcome this difficulty a method for carrying out the reversing test is described in which the hydraulic brake is connected to two turbines: one is the turbine under test and the other is a turbine which, together with the brake, imitates the torque variation of the propeller. The fundamental relations between the torques in such a system are given, and are illustrated by a diagram relating to emergency stopping of a 34,000-dwt container ship with a service speed of 25 knots. The curves in the diagram show the relative (and not the absolute) values of both torque and propeller speed. This method of investigating reversing regimes is suitable for steam turbines and gas turbines, and is particularly convenient when the installation under test consists of two or more propulsive units coupled to a reduction gear. The effect of hydraulic couplings can also be allowed for. The mechanical details of the test bed are not described, but it is stated that the method has been successful in tests on several turbine installations. Order from: BSRA as No. 49,300.

  • Corporate Authors:

    Mezhdunarodnaya Kniga

    Smolenskaya Sennaya Pl 32/34
    Moscow G-200,   USSR 
  • Authors:
    • Berkovich, S N
  • Publication Date: 1978-2


  • Russian

Media Info

  • Features: References;
  • Pagination: p. 26
  • Serial:
    • Sudostroenie
    • Issue Number: 2
    • Publisher: Mezhdunarodanya Kniga

Subject/Index Terms

Filing Info

  • Accession Number: 00187995
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Feb 3 1979 12:00AM