Advanced Materials Research Vol. 1039

Abstract: For 300 MW inner cooling turbo generator, a discrete model for cooling material flow distribution of radial ventilation cooling system has been developed. The structure optimization is studied with this model. The effect of the radial distance and the tangential distance on stator’s radial flow distribution was analyzed and optimized. The results of the simulation show that with the same inlet-outlet flow pressure the flow deviation increased as the radial distance increased but the tangential distance decreased oppositely.

Abstract: Natural wind, relative position between the nozzle and the outlet of the ram in the air-assistant spray have a great influence on performance. Air-assisted boom sprayer model is developed based on CFD. According to the data of the related parameters of the spray machine, variables of 3-D model were defined. With velocity of natural wind and inlet of the ram , the spraying flow keeping constant, the relative position between the nozzle and the outlet being a research variable, this article calculates the drift rate of the droplets respectively, then analyzes the results scientifically and gets the corresponding conclusion. At the same time, in order to confirm the reliability of the simulation results, this paper makes an experiment, which is done in Shandong agricultural university spray performance laboratory. Studies have shown that drift rate is significantly lower when the nozzles located under outlet position than on the downwind or the upwind .

Abstract: A variable spacing gas-inlet tube is designed based on the characteristics of continuous diffusion furnace. The mathematics model is constructed to calculate the optimal spacing between two air holes. The gas velocity in the furnace tube is simulated by CFD, and its feasibility is verified.

Abstract: Diffusion is a key step in solar cells production. A new continuous diffusion furnace was put forward to promote productivity. However, the paddle system of continuous diffusion furnace, not same as that of traditional ones, has two paddles to handover silicon wafers. When loading silicon wafers, the paddle produces a deformation. The deflection has a significant influence on stability and efficiency. A deflection calculation method is presented as to a specific paddle in continuous diffusion furnace. The mechanical analysis and the finite element analysis are done. The test result of deformation shows that the calculation result is close to actual situation and meets the design requirements. The calculation results are valuable references in paddle system design.

Abstract: A representative volume element is chosen to act as the research object to analyze the thermal expansion coefficient of the dispersion fuel elements. The thermal analysis is carried out for the thermal behaviors using FEM. The results are compared with several theoretical models.

Abstract: The article provides a brief overview of the existing simulation-based engineering approaches with main focus on applications in analysis and simulation of renewable energy conversion systems. Among available numerical simulation tools, the study focuses on finite element analysis and multibody dynamics simulation techniques that are currently attracting the major research attention. Any mechanical simulation task presupposes existence of a simulation model, commonly in a computer-aided design tool. Thus, the approach used to merge design data with other computer-aided engineering environment is discussed and elaborated. This approach is particularly beneficial for design optimization of wind and wave converters to be installed at harsh and unfriendly environment for testing physical prototypes.

Abstract: VisVSA is a kind of 3-D tolerance analysis software which offers high reliability calculation based on Monte Carlo simulation. This paper uses VisVSA to improve the design of gas turbine generator. In many factors that affect designing properties, the impact of manufacturing precision and assembly precision through comparative analysis are discussed.

Abstract: The mechanical behavior of plastic material is dramatically sensitive to temperature. An method is proposed to predict the mechanical behavior of plastics for cars, ranging from low-temperature low temperature ≤-40°C to high temperature ≥80°C. It dominates the behavior of plastic material based on improved constitutive model in which the parameters adjusted by a series of tests under different temperatures. The method is validated with test and establishes the basis for research and development of plastic parts for automobile as well.

Abstract: The paper presents a new method for achieving high accuracy in finish turning with slender tools in turning operations. The method is developed for high-accuracy machining with vibrations-damped boring bars with a length-to-diameter ratio up to 14. The method is based on a three-pass scheme where the deflection of the boring bar is calculated and compensated for in the finishing passes. The method shows very good results for a great variation of cutting conditions.

Abstract: This paper proposed the machining scheme of front and back combined for the blade according to the characteristics of the aero engine blades. Then the authors analyzed the entire process of the blade machining in detail, it included the machining resource selection, the process route development and NC programming created. Finally through the specific practices to verify the feasibility of the machining program.