摘要：This paper presents the performance evaluation of a regenerative pump to increase its efficiency using optimal design method. Two design parameters which define the shape of the pump impeller, are introduced and analyzed. Pump performance is evaluated by numerical simulation and design of experiments(DOE). To analyze three-dimensional flow field in the pump, general analysis code, CFX, is used in the present work. Shear stress turbulence model is employed to estimate the eddy viscosity. Experimental apparatus with an open-loop facility is set up for measuring the pump performance. Pump performance, efficiency and pressure, obtained from numerical simulation are validated by comparison with the results of experiments. Throughout the shape optimization of the pump impeller at the operating flow condition, the pump efficiency is successfully increased by 3 percent compared to the reference pump. It is noted that the pressure increase of the optimum pump is mainly caused by higher momentum force generated inside blade passage due to the optimal blade shape. Comparisons of pump internal flow on the reference and optimum pump are also investigated and discussed in detail.

摘要：We propose an analysis procedure to investigate the effects of design factors on the product quality of molded front panels via computational injection molding. Display front panels are commonly used ultra thin devices for security and decoration purposes. Poorly designed injection molds often produce texture and warping defects. Design of front panel injection molds is very challenging due to their esoteric shapes with numerous circular and rectangular holes for accommodating electronic circuits, and buttons as well as thin-walled panel. In order to make efficient design process, this paper uses Taguchi method as a computational method. MOLDFLOW simulations were obtained for various cases to process parameter combinations based on three-level of L27 Taguchi orthogonal design. The signal-to-noise(S/N) is used to find optimum levels and to indicate the impact of process parameters on deflection. As a result, packing pressure and cooling channel are found to be significant factors in this simulation for injection molding process of front panels. Tests were performed to evaluate the effectiveness of this study after desired levels of process parameters are determined. It is noted from this study that computer simulation cases based on Taguchi method are an efficient way to fix deflection problem for front panel molding.