科研之友
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摘要
In order to maximize the effect of dust removing, the structure of jet pump should be optimized. What is different from prior studies is that this paper adopts a new method named the constant rate of velocity change (CRVC) to improve the jet pump performance. The main contribution of this method is that the diffuser generates uniform velocity gradient. The performance of the jet pump with new diffusers designed by the CRVC method, obtained by CFD methods, was compared with that of the jet pump with traditional conical diffusers. The orthogonal design is used to arrange the structure combinations of the jet pump and the importance of the structure parameters are compared by the principle of variance analysis. The interaction of the throat length and the diffuser profile is the most important factor with the throat length next. The interaction is more important than the factor working solely. Therefore the interactions among the geometric parameters should be considered during the jet pump optimization. It is hard to obtain an optimal combination that could gain the highest efficiency at all working conditions. Both the conical and CRVC diffuser with more uniform inlet velocity profile has less uniform outlet velocity profile, due to the greater near-wall velocity resulting in more turbulence on the flow field in the diffuser. The CRVC diffuser produces a smoother and more uniform velocity and pressure gradient along the axis than the conical diffuser. The pump with CRVC diffuser has higher performance than the pump with conical diffuser when the throat length is less than 5 times throat diameter. So, it is suitable for applications requiring space limitation and weight restriction and improve the effiency of duct collector.
- 出版日期2013-3
- 单位武汉大学
