Papers by Author: Bin Shi

Abstract: In the present paper, a mathematical and experimental investigation is presented to describe effects of aeration on bubble motion at different flow velocities in cavitation region. Equations of work and equilibrium with the surrounding flow were developed. Relations between the cavitation numbers and air concentrations at different flow velocities were numerically solved. Experimental results showed that the numerical solutions agree well with the measured data. The influence of the cavitation numbers and air concentrations on the cavitation characteristics were analyzed. Cavitation phenomena were observed by high speed photography.

Abstract: In this paper, a speeding-up inlet was developed to increase the free stream velocity in the marine current in order to increase the input energy of turbine. This study was conducted in the Hydrodynamics Laboratory at Zhejiang University of Technology. By using high-speed camera, acoustic Doppler velocimetry (ADV), the influence of area ratio and length-diameter ratio on rotational speed of the turbine was experimentally investigated. Experimental results showed that both area ratio and length-diameter ratio have significant influences on the rotational speed of marine current turbine.

Abstract: Hydraulic characteristics of orifice plates with multiple triangular holes in hydrodynamic cavitation reactor were experimentally investigated by use of three dimensional particle image velocimetry (PIV), high speed photography, electronic multi-pressure scanivalve and pressure data acquisition system, and numerically simulated by CFD software Flow 3D in this paper. Effects of number, arrangement and ratio of holes on hydraulic characteristics of the orifice plates were considered. Effects of arrangement and ratio of holes and flow velocity ahead of plate on cavitation number and velocity profile were compared. Distribution of turbulent kinetic energy and similarity of velocity profile were analyzed. And characteristics of cavitating flow downstream of the orifice plate were photographically observed by high speed camera. Also, a comparison with flow characteristics of orifice plate with hybrid holes (circle, square and triangle) was made.

Abstract: This paper experimentally investigated hydraulic characteristics in working section of multi-square-hole orifice plates of hydrodynamic cavitation reactor by use of three-dimensional Particle Image Velocimetry (PIV) and High Speed Photography etc. Arrangements of holes in the orifice plates can be divided into diagonal, cross and checkerboard categories. The three-dimensional velocity distribution, pressure and cavitation characteristics for each arrangement of multi-hole orifice plates were measured by PIV system, pressure data acquisition system and high speed camera, and a comparison of hydraulic characteristics of the three categories of arrangements of the multi-hole orifice plates were made.