Cookies

By selecting accept and continuing to browse the site, you agree to our use of cookies. With those we collect personal data anonymously and track what visitors do on our website. We use this information to improve our website and show you information and articles to suit your interests. If you don't want our cookies, you will not be able to watch videos or share items on social media. More information?

No, I do not accept cookies

Are you sure you don't want to accept cookies?

You will not be able to watch videos or share articles on social media..

Accept Cookies
Deny Cookies

About

  • Our story
  • Governance
  • Facilities & Tools
  • MARIN Kids
  • Download centre
  • News
  • Events
  • Experts
  • Recruitment
  • Contact

Markets

  • Life at Sea
  • Oil and Gas
  • Transport and Shipping
  • Defence
  • Renewables
  • Passengers and Yachting
  • Infrastructure
  • Marine Systems
  • Authorities and Regulators

Research

  • Technology roadmap
  • JIPs & Networks
  • Publications
  • MARIN Report magazine
  • Courses
  • Research Integrity Principles

About

  • Our story
  • Governance
  • Facilities & Tools
  • MARIN Kids
  • Download centre
  • News
  • Events
  • Experts
  • Recruitment
  • Contact

Markets

  • Life at Sea
  • Oil and Gas
  • Transport and Shipping
  • Defence
  • Renewables
  • Passengers and Yachting
  • Infrastructure
  • Marine Systems
  • Authorities and Regulators

Research

  • Technology roadmap
  • JIPs & Networks
  • Publications
  • MARIN Report magazine
  • Courses
  • Research Integrity Principles
    • Change language
    • Publications

    • Thesis

    Show all publications

    Waterjet-Hull Interaction

    Authors
    van Terwisga, Tom
    Date
    Apr 25, 1996

    The main objective of this work is to develop and validate tools for the analysis of interaction effects in the powering characteristics of jet propelled vessels. Despite our knowledge about the hull and the waterjet in isolated conditions, a lack in knowledge with regard to the interference between hull system and jet system seems to exist. Many discrepancies between computed and actually measured power-speed relation of the prototype vessel are ascribed to interaction. Little knowledge is available on the mechanisms and the magnitude of these effects however. Misunderstandings in the field of jet propulsion are believed to often originate from a lack of clear definitions of concepts. It is demonstrated in Chapter 1 that a great deal of confusion can be found in the existing literature on definition and description of jet-hull interaction. Hence, this work starts with a theoretical model describing the complete waterjet-hull interaction. The effect of interaction on the hull is expressed in a hull resistance increment. The effect of interaction on the jet performance is expressed in a thrust deduction and so-called momentum and energy interaction efficiencies. The latter efficiencies account for the change in ingested momentum and energy flux due to the presence of the hull. Although a rough procedure for model propulsion tests was provided by the ITTC in 1987, this procedure was found to easily lead to large systematic errors, rendering the results of the tests doubtful. In addition, the data reduction procedure was based on an incomplete theoretical model. An improved experimental procedure based on thrust calibration through bollard pull tests is developed, together with a data reduction procedure that allows for quantification of the interaction parameters. Detailed computations and LDV measurements were made on the flow in the intake and aftbody region. They give insight into the validity of assumptions made in the experimental data reduction procedure. They show that a rectangular cross section of the imaginary streamtube upstream of the intake with an effective width of 1.3 times the geometric width, provides an adequate representation of the ingested flow. They also indicate that the jet system's thrust deduction fraction is not negligible in the speed range where the transom clears. Computations were conducted with a potential flow code and a Savitsky method, aimed at a direct computation of interaction. These computations did not show a satisfactory agreement with the experimental results. An empirical prediction model based on test results is recommended for preliminary power-speed computations. The present work provides a consistent set of definitions for a complete description of both the powering characteristics of the isolated hull system and jet system, and their interaction. An experimental procedure with a lower uncertainty level than hitherto published in the open literature is proposed for their quantification. The results of this work are hoped to contribute to a wider acceptation of the waterjet system and to smoother contractual negotiations, as the final performance of the hull-jet system is better predictable.

    Download

    Waterjet-Hull Interaction (pdf)

    ×

    You will need an account for this download

    To download this document you will need a login account. If you already have an account you can sign in below. If you want an account then you can create one.

    Login Create an account

    TAGS

    Sustainable Propulsion CFD Development CFD/Simulation/Desk Studies Noise and Vibration Resistance and Propulsion Marine Systems Powering Defence Passengers and Yachting Transport and Shipping Research and Development Cavitation propeller design research

    Related publications

    Paper

    A Semi-Empirical Prediction Method for B...

    A Semi-Empirical Prediction Method for Broadband Hull-Pressure Fluctuations and Underwater Radiated Noise by Propeller Tip Vortex Cavitation

    May 2, 2018

    This method is presented that predicts broadband hull-pressure fluctuations and underwater radiated n...

    Paper

    Design of research vessels; propeller ca...

    Design of research vessels; propeller cavitation and bubble sweep down in operational conditions

    Sep 4, 2016

    Research vessels are difficult to categorize in standard categories. To exaggerate a bit, one could...

    Paper

    Determination of propeller source streng...

    Determination of propeller source strength from hull-pressure measurements

    Jun 1, 2006

    This paper presents a computational technique for the determination of the propeller source strength...

    Thesis

    Modelling of Sheet Cavitation on Hydrofo...

    Modelling of Sheet Cavitation on Hydrofoils and Marine Propellers using Boundary Element Methods

    Oct 31, 2005

    In this Thesis inviscid models based on the Boundary Element Method are developed for the calculatio...

      CONTACT

      MARIN

      Haagsteeg 2

      6708 PM Wageningen

      The Netherlands

      + 31 317 493 911

      info@marin.nl

      route

      51.971139 / 5.654639

        Follow us

        • Contact
        • Privacy & Cookie policy
        • Disclaimer
        • Terms & conditions
        2019 © MARIN