Advanced Materials Research Vols. 655-657

Abstract: Numerical simulation of the performance of QD128 gas turbine combustor was finished using CFD method. The results indicate: The flow meter distribution of combustor is reasonable, and the velocity field of combustor meets the design requirements. Outlet average temperature is 1298K, hot spot temperature is 1486K, the temperature distribution curve meets the design requirements, and OTDF=0.280，RTDF=0.086，which are slightly higher than the level of prototype aircrafts. The results enrich the design data of QD128 gas turbine, and provide reliable reference for the running and improving.

Abstract: The three-dimensional model of heat exchangers with continuous helical baffles was built. The fluid flow dynamics and heat transfer of shell side in the helical baffled heat exchanger were simulated and calculated. The velocity, pressure and temperature distributions were achieved. The simulation shows that with the same baffle pitch, shell-side heat transfer coefficient increased by 25% and the pressure drop decreases by 18% in helical baffled heat exchanger compared with segmental helical baffles. With the analyzing of the flow and heat transfer in heat exchanger in 5 different inclination angles from 11°to 21°, it can be found that both shell side heat transfer coefficient and pressure drop will reduce respectively by 86% and 52% with the increases 11°to 21°of the inclination angles. Numerical simulation provided reliable theoretical reference for further engineering research of heat exchanger with helical baffles.

Abstract: Impact of vane curve on hydraulic performance of the DQ100-64-22 stamping pump was researched by CFD simulation and experiments. The research results show that processing fillet at the connecting section of space blade and shafts only generates minor influence on the pump performance，but it can decrease incidence losses of the inlet flow. The cylindrical blade type has great influence on both inner flow field and hydraulic performance of pump in the high flow rate conditions. The research can supply a good support for the vane curve design and manufacture of stamping and welding multistage centrifugal pumps.

Abstract: For preventing sand in underground oil, this paper structures a model of hydrocyclone with the inside cyclone and the outside one seriesing and describes how it works. By the TGrid procedures, the all of the hydrocyclone is meshed with the tetrahedral and the boundary conditions are determined. The methods of Three-dimensional numerical simulation in FLUENT are used to simulate the velocity field distribution, the pressure field distribution, the path lines of the separated medition characteristics of the separated medium and the phase distribution of the medium. The affect of the internal separated medition characteristics to the separated performance is analysed. Through the simulation, it is found that the spiral fin in the hydrocyclone can guide the fluid to produce a vortex flow to meet the purpose of separating the solid-liquid. There is no formation of the air column comparing with the conventional cyclone, so the internal flow field is more stable to conductive to the separation of the media. It provides a basis for the improvement of the cyclone.

Abstract: With the application of FLUENT, in the inner flow field of the non-circular opening spool valve, the three-dimensional steady-state model was simulated at different valve port opening. The numerical simulation and visual analysis of the aboved flow field was carried out. In the valve port, the mass flow simulation value was compared with the calculated value. Then the relations of the valve opening size and speed, pressure and valve port flow characteristic of the flow field could be abtained. This method is helpful of analysis to different valve port structures, and plays an important role in the improvement of hydraulic valve performance.

Abstract: In practical aero-engine bladed disk structure of blade mistuning is inevitable, and seriously affects the vibration characteristics of bladed disk system also on the whole aero-engine performance and life. Through the analysis, the blades arrangement order of a set of mistuned blade can greatly influence the vibration of bladed disk system, on this foundation; put forward a kind of new localization level of vibration parameters method for the characterization of mistuned system vibration localization degree. Furthermore, genetic particle swarm algorithm is used to optimize the blade arrangement sequence. The research shows that the selection of appropriate blade arrangement sequence can effectively reduce the bladed disk system forced vibration amplitude and the localization level of forced vibration.

Abstract: According to the characteristics and the future tendency of common rail systems for marine diesel engines，the paper used a new injector. A simulation model of the common rail system with new injector was established using HYDSIM system, pressure fluctuation of the common rail pipe and pressure loss of the injector as evaluation indicator, the injector was simulated and optimized using DOE method. Simulation results show that appropriate selection of the structure parameters of the injector structure can effectively prevent the injectors from interfering each other and degree pressure loss of injector.

Abstract: The torque pulsation was minimized using the Taguchi methods in this paper. The analytical model of torque was derived by the energy method. The Taguchi optimization method was used to generate the experiment samples, which were calculated in 2-D and 3-D FEA. Three different parameters of PMSM, such as skew ratio, pole embrace and stator slot width were optimized. ANOVA was used to analysis the effect of different factors in Taguchi method. The superiority of the optimized PMSM was also verified further through FEA.

Abstract: Take s814 airfoil as an example, established the multi-objective optimization model of moment of inertia and the weight for wind turbine blade main beam,Using the genetic algorithm global optimization algorithm, and given the Pareto solution set of optimal with the form of Pareto front. Select four kinds of optimization results scheme to do finite element calculation. The results shows that the magnitude of moment of inertia accordance with the change trend of main beam deflection, the width and thick of beam cap have great affect on moment of inertia and weight, the nearer aerodynamic center of leading edge, the greater moment of inertia, the thick of web almost no influence on moment of inertia.

Abstract: Focusing on the problem of accuracy machining to the friction welder,taking the spindle box of friction welder as the research object,the finite element simulation software of ANSYS workbench is applied to the static analysis of the box ,then the stress and strain response can be available. And through the using of sensitivity analysis optimization scheme is proposed ,which prerequisite basis is obtained for the optimization design and the improvement of breed to the spindle box of large friction welder