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CALCULATING THE RESISTANCE OF COMMUNICATING OUTBOARD HOLES IN A SHIPS HULL

A new method is developed for calculating the resistance of communicating outboard holes to ship propulsion. The nonuniform distribution of pressures within the penetrated space is taken into consideration. A method is developed for the case of negative pressure gradient on the ships hull. A Bernoulli equation is compiled for the stream of overflowing fluid between its two sections in which pressure and boundary layer thickness will not essentially change. The frictional drag coefficients are taken to be independent and are experimentally determined on a special aerodynamic stand and in an aerodynamic tunnel with an open working portion (description of system given). Liquid flow in the stream is considered to be planar, and the width of the stream is taken to equal the maximum width of the outboard aperture with adequate accuracy for practical use. By taking advantage of the theorem of the quantity of fluid motion, the degree of resistance of two communicating holes in ship propulsion is obtained. Because of the difficulties in theoretical calculation of the speeds, findings from measuring the coefficient of resistance are utilized in the calculations. The results obtained are corrected for nonfulfillment of boundary layer thickness under experimental and full-scale conditions.

  • Corporate Authors:

    Trudy Leningrad Korablestroitelnyy Instituta

    Leningrad,   USSR 
  • Authors:
    • Tkachuk, G N
  • Publication Date: 1966

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Filing Info

  • Accession Number: 00014979
  • Record Type: Publication
  • Source Agency: Joint Publications Research Service
  • Files: TRIS
  • Created Date: May 7 1973 12:00AM