Advanced Materials Research Vols. 712-715

Abstract: The main inlet component of steam turbine is control valve. The stable operation of the steam turbine control valve is vital for safe and stable operation of the steam turbine and safety production of the power plant. However, due to the complexity of the structure and unsteady characteristics of steam flow in the valve, there is not enough experimental method about the detailed flow characteristics of the area near control valve disc and the inside of the valve chamber up to now. This article is to focus on the simulation of the steam turbine control valve interior flow field which includes the valve pre-inlet channel in different conditions, then find the reasons which caused instability and pressure loss of the control valve by analyzing the flow field details, finally further optimization design. The profile matching of the valve disc and valve seat has a great influence on the interior flow field of control valve, so analysis of the high performance valve disc shape and divergence angle of valve seat is carried out, and the research conclusion is used for guide design and development of the control valve.

Abstract: A three-dimensional mathematical model is developed to describe the influence of AGD beams on gas distribution in COREX-3000 shaft furnace. The calculated result shows that with AGD beams installed, the pressure drop in furnace is decreased while the volume of low velocity zone at bottom of furnace is enlarged. AGD channels can lead reduction gas into shaft center, and increase the gas velocity at slots level, but it have little effect on gas distribution at upper part of the furnace. AGD beams are also good at restraining down pipe gas, and the volume fraction of down pipe gas declines from 9.89 % to 6.41 %, decreases about 35.2%. 2#COREX furnace with AGD beams is better at achieving uniform gas distribution.

Abstract: This thesis is devoted to the research on different microstructures design of lighting LED fluorescent lamp diffuser,and the simulation analysis of the light and distribution graph of 2D microstructures array diffuser of C semi-cylinder lens and V-cut prism,diffuser of microlens array 3D microstructures and non-micro structure diffuser by software Light Tools,then comparative analysis the transmittance and uniformity of these diffuser.The finding indicate that,Compared with none microstructure and 3D microlens diffuser,2D microstructure diffuser can achieve LED fluorescent lamp uniformity and transmittance reached more than 85%, it can realize the excellent integrated optical properties indicators of LED fluorescent lamp light uniform distribution,Not only realize the energy saving and avoid glare effect.

Abstract: In the paper, the transmission process of light in the light diffuser plate of micro V-cut prism structure was analyzed and the uniformity and transmittance of the diffuser were calculated based on Light Tools software; At the same time, the effect of micro V-cut prism structure, namely the height of the prismthe width of the prismthe aspect ratio of the prism and the arrangement of the prism on the uniformity and transmittance of the diffuser were simulated. The result shows that the light diffuser plate of micro V-cut prism structure has effective diffusion on the LED daylight lamp which integrated optical property of the uniformity and transmittance is more than 85%; Furthermore, the aspect ratio of the prism has a big influence on the optical property of the diffuser, it shows that the integrated optical property of the diffuser is best when the aspect ratio is 1.2.

Abstract: The grinder perforated plate with bone-removal systems has a unique design to improve the quality of ground meat. The pressure distribution on the grinder knife/plate interface during grinding of meat was investigated. The peripheral pressure on meat grinder plates during operation was greater than at the center thus hard particles are collected at the low pressure point. The mechanical models on the perforated plate surface created in MATLAB 7.0 for linear programming, and the 3D model of the perforated plate created in Pro/E software were imported into ANSYS 9.0 software and a linear static finite element analysis was performed. The visual deflection patterns the part experiences under "real world" loading conditions were obtained so as to complete the security check of strength.

Abstract: This paper presents the development of a machine tool which combines the forming and the surface strengthening processes for large scale aircraft parts together. The developed machine tool produces the required part shape not by bending but by combination of differential compressive plastic stresses induced by shot peening to different areas of the part in a predetermined sequence. It has a total mass under 4200kg and is capable of forming and strengthening panels of 15x1.5x0.02m³ in size. The machine tool has been successfully applied for production of honeycomb wing panels of Be-200 multipurpose amphibious aircraft made of aluminum alloy.

Abstract: As one of the most significant methods to study hypersonic flight vehicle, the numerical simulation of supersonic combustion ramjet has drawn an ever increasing attention at present. Nevertheless, the traditional serial simulation cannot satisfy the practical needs because of high calculation precision, avaricious memory overhead and overlong computation time. In this paper, we study on a general algorithm for scramjet simulation, and bring about parallelization by using a hypergraph partitioning algorithm and a two level hybrid parallel model. The whole computing domain is decomposed into several sub-domains based on hypergraph partitioning, and each sub-domain is assigned to a MPI process. A single step of computation operates in the inter loop level, where a compiler directive is used to split MPI process into several OpenMP threads. Finally, speedup and parallel efficiency of our hybrid program testing on a China-made supercomputer with 4 to 256 cores is compared with pure MPI program. And, the hybrid program exhibits better parallel performance than the pure MPI program in the main, roughly as expected. The result indicates that our hybrid parallel strategy is effective and practical in scramjet simulation.

Abstract: Design on brake is one of the most important aspects of the vehicle design. Large number of experiment must be carried out. But unable to carry out road test in the design stage, so we can only equivalent simulation test on the experiment platform. This requires to control the experiment platform. This paper firstly set up the model of rotational inertia and solve the model, then adopt gray prediction method based on gray theory to create model. To predict the drive current and detect it. We realize the model and find the result of the method are quite satisfied with the accuracy reached 0.9999.

Abstract: According to the special working environment of TT&C ships, S/X/Ka frequency TT&C system needs to be developed by using beam waveguide antenna technology in order to ensure Goddess of the moon project. Antenna structure design is one of the key technologies in the TT&C system. This paper designs the antenna structure detailedly, in which features and design parameters of antenna reflector, antenna seat, shaft angle detection and safety protection devices are given. The load of antenna structure is simulated and calculated based on ANSYS and results show that the designed antenna structure is reasonable, antenna parameters and components configuration are correct, all that fully meets the requirement.

Abstract: The saucer-shaped aircraft is a novel aircraft adopting blend-wing-body configuration. The linear perturbation theory based on the classic flight dynamics was used to analyze the longitudinal, lateral and directional flight qualities of the saucer-shaped aircraft under low speed conditions. The flight qualities were given. Meanwhile the aerodynamic characteristics of the saucer-shaped aircraft, the conventional aircraft and the flying wing aircraft were also contrasted to discuss their similarities and differences. The results show that the saucer-shaped aircraft has stable longitudinal mode, rollover mode and Dutch roll mode. The spiral mode is unstable. The saucer-shaped aircraft exhibits superior flight qualities and excellent comprehensive performances.