Sökning: "thrust deduction"

Hittade 4 avhandlingar innehållade orden thrust deduction.

  1. 1. Investigations of Waterjet/Hull Interaction Effects

    Författare :Arash Eslamdoost; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; pressure jump method; thrust deduction; numerical simulation; waterjet propulsion; gross thrust; trim angle; waterjet hull interaction; net thrust; potential flow; sinkage; non-linear free-surface;

    Sammanfattning : A waterjet propulsor operates in a different way than a conventional propeller. This makes it hard to use the same concepts for studying the thrust and powering of these systems. LÄS MER

  3. 2. The Hydrodynamics of Waterjet/Hull Interaction

    Författare :Arash Eslamdoost; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; trim angle; vena-contracta; transom clearance; net thrust; waterjet hull interaction; waterjet propulsion; capture area; exit drag; non-linear free-surface; intake drag; gross thrust; sinkage; streamtube; RANS; thrust deduction; potential flow; VOF;

    Sammanfattning : The objective of the present investigation is to explore the physics behind the waterjet/hull interaction, and in particular the negative thrust deduction often reported in the semi-planing speed range. Another objective is to propose a validated numerical technique for computing the hydrodynamics of waterjet-driven hulls. LÄS MER

  4. 3. Propeller-Hull Interaction Effects in Calm Water and Regular Head Waves

    Författare :Mohsen Irannezhad; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; RANS; Resistance; Thrust Deduction Factor; Self-Propulsion Point of Model; CFD; Regular Head Waves; Nominal Wake; Ship Motions; Taylor Wake Fraction; Propeller Open Water Characteristics; EFD; FNPF;

    Sammanfattning : In order to design fuel-efficient ships and install compatible propulsion systems, ship and propeller designers need to know the potential effects of the interactions between different ship components, e.g., hull, propeller, appendages and machinery, on the ship performance at sea. LÄS MER

  5. 4. Using Energy Fluxes to Analyze the Hydrodynamic Performance of Marine Propulsion Systems

    Författare :Jennie Andersson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Propulsor-Hull interaction; Control volume analysis; RANS; Energy balance analysis; CFD;

    Sammanfattning : The strive towards more fuel efficient ships is a continuously ongoing process, motivated by both economic and regulatory reasons. An important aspects to consider for the final fuel consumption is the propulsion system performance in relevant operating conditions. LÄS MER