Zhang Yong Wu

The Change of Velocity and Pressure of Micro Bubble in Multi-Phases Flow in Mesoscopic Scale

The dissolution mechanism of air and formation mechanism of bubble in the scopic-scale,and the change rule of the velocity and pressure of bubble in the rising process,made the theoretical analysis and explanation. Be based on VOF model,with the help of Fluent software,For the single bubble rising in the water by numerical simulation;The results show that liquid phase flow state is a key factor affecting the speed of the bubbles rise;Pressure difference is the main reason cause the jets and bubbles deformation.Through the above process in the rising process of the bubble velocity and pressure changes, and a detailed analysis of inquiry, the pressure and velocity of the bubble rising process show up more realistic.

Fluid-Solid Coupling Heat Analysis of Aerostatic Guide Components

This paper presents the parameters and assumptions of the hydrostatic guide rail in both ideal and actual working conditions, the simulate calculation of fluid-solid heat coupling field between gas film and the bearing surface is finished by Fluent based on finite volume method. By analyze and compare the results after post-treatment, we gain the effects caused by guide way’s structure and deformation on the formation of film pressure field, temperature field inside gas film, besides this paper also provides relate conclusions.

Single Stand Reversing Mill Steel Belt Running Deviation System Analysis and Simulation

This paper mainly analyzes the single stand reversible rolling mill strip wandering mathematical model of electro-hydraulic servo system using MATLAB/Simulink and constructs electro hydraulic servo control system model. It carries on the simulation analysis of the quality of the electro-hydraulic servo system. Through the study of strip running deviation design of servo system , we understand of the principle of design of electro-hydraulic servo hydraulic system and the MATLAB simulation.

Design and Performance Analysis of Digital Pressure Relief Valve of Water-Based Hydraulic

this paper use the stepper motor as driver, designed the structure of a digital pressure relief valve of water-based hydraulic, and establishment mathematical model of the valve element cavitation flow field, simulated and analyzed the different the valve element cavity volume and rounded of water pressure relief valves cavitation flow field by use Fluent software. The results showed that: It can suppressed cavitation that appropriate increases cavity volume and reduced the spool fillet.

The Optimal Design and Simulation Analysis of High-Speed Switching Valve Based on Magnetorheological Fluid

This article designed a kind of magnetorheological high-speed on-off valves and made optimized design based on the nature of the magnetorheological fluid(MRF). ANSYS software was used to analyze magnetic field of the two different structures and get the magnetic flux lines distribution and flux density map. The simulation analysis results show that: optimized high speed switching valve, can reduce the loss of the coil and the rise of temperature, improves the life of the valve body, it also can shorten the switching response time and improves the reliability of the valve.

Research on Ceramic of Water-Based Component

That the key components of Water-based hydraulic components are easy to wear down in the course causes sealing performance degradation and then arises leakage, which affects water-based component life and hydraulic system operational reliability. Considering the characteristics of ceramic materials, the ceramic method is applied to improve the key parts of water-based component, and then wear and failure mechanism analysis was done on ceramic water-based component.

Study of Speed Adjustment in Friction Drive for Aerostatic Guide Way Components

T Abstract here. This paper designs the transmission structures of an aerostatic guide way and makes a series of analysis respectively. With the use of friction drive theories, a transmission system which is composed by rods and oblique wheels is designed. After strength check and feasibility analysis of this transmission agent, ADAMS is adopted to do kinematics analysis successfully for this transmission agent. Finally related conclusions are made.

Mechanical Model of Nonmagnetic Mineral Particles in Magneto Hydrostatic Static Separation

Base on the fluid dynamics，electromagnetism，Newton’s law and some other basic theories，the paper analyses the equations of motion and Bernoulli for nonmagnetic mineral particles in magnetic fluid. And apply these theories to establish the mechanical model for the nonmagnetic mineral particles in magneto hydrostatic static separation (MHSS). In MHSS, the particles would be stressed by gravity force, magnetic buoyancy, ordinary buoyancy, etc. The wedge-shaped magnetic poles can set up the magnetic buoyancy of which direction is straight up, and the levitation force could be stronger in ferromagnetic fluid. And it can be calculated equating normal buoyant weight to the magnetic buoyant force that any nonmagnetic substance can be floated in magnetic fluid. The paper also analyses some parameters that affect the separation result, such as the magnetic field intensity and the magnetic field gradient. These tasks may give some supports for MHSS applied in industrial.

The Properties of Two-Way Cartridge Valve in Water Hydraulic through Matlab/Simulink

According to the requirements of hydraulic transmission to two-way cartridge valve, and from the practical point of view a water hydraulic two-way cartridge valve was designed. Then its structure characteristics was introduced and the mathematical model was established. The simulation analysis of the water hydraulic two-way cartridge valve has been carried out through Matlab/Simulink proving that its structure was reasonable and it had good performances.

The Properties of Water Hydraulic High-Speed On/Off Valve Ceramic-Based

In order to solve the severe wear problem of the core in water hydraulic high-speed on/off valve, according to the requirements of high-speed on/off valve components in water hydraulic transmission and from the practical standpoint, the core manufactured with ceramic materials could bring its advantages of high strength, big hardness, good wearability, non-affection with corrosion into play.By the wear-resisting experiment the wear case of Si3N4 ceramic core has been studied with weight-loss method by electronic analysis balanc.The results show that the core manufactured with Si3N4 has high abrasion resistance and low wear rate, and the structure design of water hydraulic high-speed on/off valve with ceramic core is reasonable and the performance is good.