Applied Mechanics and Materials Vols. 260-261

Abstract: The article presents the results of physicochemical modeling of hypergene processes in the tailing dump of the Solnechnaya Reclamation Plant (SRP). The effect of temperature factor on the hypergene minerals crystallization and pore solutions formation was researched.

Abstract: The evaluation methods of wind farm in China are not perfect enough, and there are a few differences between analyze and evaluate. The reliability evaluation of wind resources and generated energy can improve wind resources evaluation level and estimating generated energy accurately. How to evaluate wind farm is the emphases. The paper brings forward the reliability analyze of the wind turbine, and the methods of the evaluation wind farm. The reliability evaluation could improve the generated efficiency and economic benefits.

Abstract: A novel radio frequency single-dielectric-barrier-discharge atmospheric pressure plasma generator was designed and utilized to strip AZ9912 photo-resist (PR). Argon (Ar) and oxygen (O2) were employed as the working gases under atmospheric pressure in ambient air. The PR stripping rate was measured as functions of time, input power, and the flow rates of the oxygen/argon. Optical Emission Spectroscopy (OES) was used to measure the optical emission spectra of the plasma to study the mechanism of PR stripping process. It is presumable that C-H bands were broken by high energy electron in the plasma and OH was generated in the process with the participation of O atom. Optical Microscope, Atomic Force Microscope (AFM) and Scanning Electron Microscope (SEM) were used to measure the surface of the silicon substrate after the stripping. It is proved that this kind of novel device could strip the AZ9912 PR effectively as high as 850nm/min, without residues and ion bombardment damage on the wafer substrate.

Abstract: A new method of torque distribution of in-wheel motor driving vehicle aiming to save energy was introduced. For the method, the optimal goal is the wheel slip power which is the product of longitudinal force and the slip speed.The constraint equation is the vehicle motion equation. The optimal variable is the wheel rotating speed. The optimal model was established by using ModeFrontier. It showed the distribution method decreased the wheel slip power and the driving efficiency was enhanced under the condition of straight-line and cornering running. The work provides a new energy-saving idea for in-wheel motor driving vehicle.

Abstract: High lift and low drag are desirable for wind turbine blade airfoils. The performance of a high lift airfoil at high Reynolds number (Re) for large wind turbine blades is different from that at low Re number for small wind turbine blades. This paper investigates the performance of a high lift airfoil DU93-W-210 at high Re number in low Re number flows through wind tunnel testing. A series of low speed wind tunnel tests were conducted in a subsonic low turbulence closed return wind tunnel at the Re number from 2×10⁵ to 5×10⁵. The results show that the maximum lift, minimum drag and stall angle differ at different Re numbers. Prior to the onset of stall, the lift coefficient increases linearly and the slope of the lift coefficient curve is larger at a higher Re number, the drag coefficient goes up gradually as angle of attack increases for these low Re numbers, meanwhile the stall angle moves from 14° to 12° while the Re number changes from 2×10⁵ to 5×10⁵.

Abstract: This paper analyzes the structural features of the human eye in the middle of the road lighting visual state of the visual request of road lighting in the Mesopic range of lighting, road lighting standards to build a white and green LED light source distribution model and defines the sharpness of the image according to the model function. In the Matlab7.1 environment, high pressure sodium yellow light LED white light and LED white and green background light, the model simulation analysis of the image clarity, results show that, in the Mesopic same brightness level state road lighting selection white and green the LED light source has better clarity and sensitivity.

Abstract: An experimental study has been carried out to evaluate how fin and copper foam enhance the heat transfer performance of phase change thermal energy storage unit. The thickness of fins is 0.8mm, the porosity of the copper foam is 96% and the phase change material (PCM) is 99% pure eicosane. The samples with fin, copper foam and paraffin (FCFP) or with single copper foam and paraffin (CFP) were processed and their response to temperature variations were tested for vertical placement and horizontal placement under different heat flux conditions. The experimental results show that the use of fin and copper foam can make the sample melt much faster than single copper foam and the effective thermal conductivity of the FCFP composite is 10.83 W/(m∙K), which is 2.7 times as that of the CFP composite. In addition, horizontal placement is more contributive to the heat transfer than vertical placement for high thermal conductivity composite.

Abstract: With increasing emphasis on the energy crisis and environmental pollutions, wind power has been developing rapidly worldwide. Because of its unique advantage of variable-speed constant-frequency (VSCF), doubly fed induction wind generator (DFIG) has been widely used in the wind power industry. In this paper, a 3.5kW doubly fed induction wind generator is designed and modeled utilizing ANSOFT, after the optimization of the generator parameters, the data of the stator and rotor no-load and full-load are given by simulation. On this basis, a physical model of doubly fed wind generator is established by Maxwell 2D. And through a finite element triangulation, the distributions of magnetic lines of force and magnetic field within the motor are obtained.

Abstract: In this paper，we first discuss the purpose as well as the main types of energy storage，then some advantages of utilizing the thermal and electrical energy storage are reviewed with emphasizing their vital role in promoting the large-scale utilization of renewable energy. Finally，some future R&D demands are pointed out.

Abstract: In this work, we present the simulation results of the technological parameters and the electrical characteristics of a crystalline silicon n⁺pp⁺ solar cell, using two-dimension (2D) software, namely TCAD Silvaco (Technology Computer Aided Design). TCAD Silvaco Athena is used to simulate various stages of the technology manufacturing, while TCAD Silvaco Atlas is used for the simulation of the electrical characteristics and the spectral response of the solar cell. The J-V characteristics and the external quantum efficiency (EQE) are simulated under AM 1.5 illumination. The conversion efficiency(η)of 16.06% is reached and the other characteristic parameters are simulated: the open circuit voltage (Voc) is of 0.63 V, the short circuit current density (Jsc) equals 30.54 mA/cm² and the form factor (FF) is of 0.83 for the n+pp+ solar cell with a silicon nitride antireflection layer (Si3N4). In order to highlight the importance of the back surface field (BSF), a comparison between two cells, one without BSF (structure n⁺p), the other with one BSF (structure n⁺pp⁺), was made. By creating a BSF on the rear face of the cell the short circuit current density increases from 28.55 to 30.54 mA/cm², the open circuit voltage from 0.6 to 0.63 V and the conversion efficiency from 14.19 to 16.06%. A clear improvement of the spectral response is obtained in wavelengths ranging from 0.65 to 1.1 µm for the solar cell with BSF.