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Pump applications in the field of industrial production, also the energy consumption of major equipment, multi-stage pump is the most important type of pump, a direct impact on the performance of the pros and cons of the enterprises into production effective. In industrial production with multi-stage pump cavitation characteristics is an important indicator for assessing their overall performance. Improve the performance of the the multistage pump inlet cavitation, safe operation, energy conservation, improve the economic efficiency of enterprises, is very meaningful. In order to improve its cavitation performance, and to ensure a good efficiency, the paper on multistage pump first stage impeller inlet way hydraulic characteristics. First, details the hydraulic design of the impeller, the pump CAD software using self-developed model design in specific hydraulic design and optimal correction obtained under the optimized design of single-suction and double suction impeller, the use of three-dimensional modeling software its The impeller Road three-dimensional solid modeling. Secondly, introduces the theory and operation of the numerical simulation for the commercial CFD software, research on this topic impeller Road Numerical simulation of meshing, calculation methods, made a detailed analysis of boundary conditions and Research. Then, optimize the design to obtain single-suction centrifugal impeller and double suction centrifugal impeller internal flow field numerical calculation and analysis, research different traffic conditions, the internal pressure, the velocity distribution. Comparative analysis of the internal flow field optimized single-suction and double-suction centrifugal impeller, respectively, both from the internal flow structure and the external characteristics of the impeller performance analysis obtained the distribution pattern of the flow field inside the impeller, analysis cavitation occur status and reason go out to draw performance curves derived double suction design of this model multi-stage pump head than single suction improved imported anti-cavitation relative to quantify the results, and to enhance the performance of the pump head and efficiency curves smooth improved before and after the change, and thus verify the simulation of the flow field CFD technology, the feasibility of the method of double suction first stage impeller design, provide some references for the optimization of the design of the pump. Subsequently, the introduction of a common suction chamber types and their characteristics, In this paper, the heads of the suction chamber requirements. Contrast transformation of the former segment heads of single-suction multi-stage pump model diagram heads, dual suction multi-stage pump model diagram, draw a segment after transformation. Finally, the difficulties for the actual design, combined with the experience of numerical simulation, a summary of the results of the study and prospect.
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