The S-shaped hydrofoil is often used in the design of reversible machinery due to its centrally symmetrical camber line. objective this paper study influence cloud cavitation on flow structure and unsteady characteristics lift drag around an via experimental tests numerical simulations. In component, were carried out a tunnel high-speed camera was record details with different numbers. results ...

In this paper, a feasibility study of building a Human Powered Hydrofoil (HPH) vessel is reported. Hydrofoil vessels are a well-known class of high-speed crafts. In addition to high-speed operation, the hydrofoils have a reliable maneuvering capability, good stability and proper operation in waves. Also, a human powered vehicle, nowadays is an advancing idea. Different aspects of the design and...

The transition in the boundary-layer flow affects hydrodynamic performances of hydraulic machineries, as key components ship propulsion system. shear stress transfer (SST) γ-Reθt model is an important prediction tool boundary layer simulation for hydrofoils. present paper improves accuracy SST layers along a curved hydrofoil. flows hydrofoil improved by introducing correction to onset Reynolds ...

Abstract In hydraulic equipment, tip clearance may result in a leakage vortex known as (TLV), which reduces the machinery’s energy efficiency. order to lessen damage brought on by clearance, this research sets angle, location, spacing, and depth of grooves significant criteria. The orthogonal approach is used design hydrofoil’s grooves. Numerous simulations are carried out using SST k-turbulenc...

Unsteady vortex shedding at a trailing edge may cause pressure fluctuations and strong tonal noise which can have important consequences to the performance of marine and aeronautical type lifting surfaces. This paper presents data from unsteady RANS simulation of high Reynolds number trailing edge flow. It aims to identify and quantify dominant features of the trailing edge flow field over a tw...

The linearized treatment of the flow over a partially cavitating single hydrofoil having a flat pressure surface and a circular-arc suction side is presented. The flow is treated as a two-dimensional, steady, inviscid flow. Further assumptions made are those of incompressibility and irrotationality. The results obtained are compared with experiment and generally good correlation is found for th...

As one of the typical negative factors affecting vortex structure and flow characteristics hydraulic machinery, TLV has a non-negligible impact on energy performance. In order to improve utilization efficiency machinery in marine energy, parallel grooves is proposed applied NACA0009 hydrofoil. Subsequently, an exhaustive numerical analysis carried out adopting SST k-ω turbulence model, effects ...

In the present paper, restricted cavitation bubble dynamics near a symmetric Joukowsky hydrofoil are researched theoretically and experimentally. Using Kelvin impulse theory, transformation, circle theorem, theoretical model for is established to analyze collapse jet characteristics. The validity of this then verified using high-speed photographic experiments. velocity direction at specific pos...

The present paper contains the test results of a planing catamaran model. The aim of the tests was to study the effect of hydrofoil in these types of crafts. First, experiments were carried out on the bare body (i.e. without hydrofoils) to obtain non-dimensional hydrodynamic resistance coefficient versus speed. Then, the model with hydrofoils, by various locations and attack angles were subject...