Advanced Materials Research Vols. 774-776

Abstract: Simplify the structure of a new sugarcane loader with metamorphic function, and build a virtual prototype model. Use software MSC.ADAMS for kinematics simulation of the sugarcane loader. Analyze the relationship between input and output of the sugarcane loader during the different working phases.

Abstract: The aerodynamic force coefficients of road vehicles under wind loads depend on not only the shapes of vehicles but also those of infrastructures, such as a bridge. Therefore, study of the aerodynamic characteristics of road vehicles considering the interaction of aerodynamic forces between the road vehicles and bridge is necessary for predicting the performance of vehicle under wind loads properly. This paper studies aerodynamic characteristics of road vehicles when vehicles run on bridges under cross winds using the CFD method. The dependence of aerodynamic forces on vehicle speeds, the interaction of aerodynamic forces between the vehicles and bridges and the influence of the turbulence are investigated by different simulation cases.

Abstract: It is very difficult to establish a model of wind turbine blade in finite element software directly because of complexity of the shape. To solve this problem, parameterized modeling and analysis program of wind turbine blade is developed applying of ANSYS secondary development technique based on VB6.0. Processes of establishing a finite element model, applying loads and extracting Post-processing data of wind turbine blade are described. A numeral example demonstrates the program is feasible and correct. The research work can help to speed up application of ANSYS secondary technique in design and analysis of wind turbine blade and provide references for parameterized modeling and analysis of similar engineering in the future.

Abstract: Heat transfer characteristics of China RP-3 kerosene under supercritical state were experimentally investigated. Results showed that at sub-critical pressures, heat transfer deterioration happens, and the wall temperature rises from approximately 350°C to 750°C. This is thought to be resulted from film boiling when kerosene begins to transfer from liquid to gas. At supercritical pressures, heat transfer enhancement was observed. And it is mainly caused by the sharp increase of specific heat of kerosene when the wall temperature is approaching the critical temperature of kerosene. The heat transfer coefficient doesnt increase with velocity for kerosene, because the thermal properties and residence time of kerosene have changed when velocity is changed.

Abstract: Large eddy simulation to describe the turbulent flow of airflow field was used to calculate the unsteady turbulent flow characteristics in the cyclone. It funded that the tangential velocity in the cyclone profile behaved like rankine vortex, with the downward semi-free vortex of the outer layer and the upward forced vortex. With the increasing import gas velocity, the swirling strength of the center increased which reduced collection efficiency by clouding the dust particles in the ash bucket to the center airflow.

Abstract: In the present work, the tidal stream energy in surrounding coastal zones of ZTD is calculated. The tidal current velocity is gotten by three dimensional numerical modeling. The tidal current model is validated by measurement of tidal current observed in 4 points surrounding ZTD. The numerical results given by the tidal current model already shows that: the tidal current velocities given by the model agree with the measured velocities generally. The characteristics of tidal currents around ZTD are analyzed and the following tidal stream energy density is calculated. The maximum tidal stream energy flux of unit width occurs around the middle locations of ZTD southern areas.

Abstract: At present, most of the oil fields have already got in high water cut period. For the problem of enhancing oil recovery, the impacts of pressure gradient, the width of the runner, the height of the oil film, the interfacial tension between oil and water, and viscosity on velocity distribution and stress distribution are considered. Using the constitutional equation of generalized Newtonian fluid under the isothermal condition, the flow equation of the water is set up which can describe the flow of the water flowing in the microscopic pores. A numerical simulation for the model is carried out by using Polyflow. The results show that the more pressure gradient, the greater of the oil film height, the smaller interfacial tension between oil and water, there is the better displacement efficiency.

Abstract: In order to promote the localization of critical valve in ultra-supercritical thermal power generating unit, a two-stage superheated electrical steam trap was designed and developed. Its structure and operation principle was introduced. Three-dimensional numerical simulation of the internal turbulent fluid field was performed by using Fluent of computational fluid dynamics software. The results show that the superposed design of associated reaction with multiaperture equalizer and guide sleeve was adopted in the two-stage superheated steam trap. The internal flow field become more uniform, local maximum velocity reached 37.2m/s. The brush erosion of valve seat is reduced and the service life is increased. Success rate of the first sample's trial-manufacture is greatly improved by using CFD simulation experiment in the process of design. Development cycle is shortened and the cost is reduced, which can provide a reference for two-stage superheated steam trap design.

Abstract: The function of honeycomb with different length and width in improving flow quality were studied in the course of building a new small section open loop wind tunnel. Instantaneous velocities of turbulent flow in the tunnel were measured by cobra probe. The focus of this study was put on the effect of the honeycomb in attenuating the total turbulence intensity including the free-turbulence carried by the incoming flow and the turbulence generated by the square cells themselves. The change tendency of the mean wind velocity and the total turbulence characteristics in the decay area have been studied by varying the length to cell size ratio L/D, and ratio of distance between the square cells and the measuring position to cell size X/D.

Abstract: Non steady state diffusion flow is unstable movement of moisture in a material which changes with respect to time. Diffusion coefficient describes the rate at which water moves from the interior to the surface of the materials. Absorption and desorption are the variables that are used to determine the diffusion coefficient. Understanding of the water absorption and desorption is important since it affects the mechanical properties of materials such as strength and durability properties. Water absorption and desorption of the materials or products intended for drying are important for the design and operation of dryers such as kiln drying and other processing system. Nowadays, the processing of solid wood into finish product is decreasing due to increase in the cost of solid wood and insufficient supply of quality logs. Agricultural waste such as pineapple leaves is one of the potential raw materials that can be used in particleboards manufacturing. Pineapple leaves particleboards were produced and the diffusion of coefficient of water absorption, percentage thickness swelling and percentage thickness shrinking were determined. Diffusion coefficient was determined based on the absorption and desorption rate. The particleboards manufacturing followed BS EN 326 and testing of samples was in accordance with BS EN 317. The difference in thickness of particleboard has great influence on physical properties. In this study the particleboard made of 1 cm has the lowest water absorption compared with 2 cm particle board and has highest thickness shrinking.