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Hydraulic optimization method for flow channel type guide vane of multistage centrifugal pump under multiple working conditions

A technology of hydraulic optimization and centrifugal pump, which is applied in the directions of pumps, pump components, non-variable-capacity pumps, etc., can solve the problems such as public reports on the hydraulic optimization method of multi-stage centrifugal pump flow channel guide vanes under multiple working conditions, etc. The effect of improving weighted average efficiency and saving economic costs

Active Publication Date: 2015-12-16
JIANGSU UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] So far, there has been no public report on the multi-condition hydraulic optimization method for the channel-type guide vane of multi-stage centrifugal pumps

Method used

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  • Hydraulic optimization method for flow channel type guide vane of multistage centrifugal pump under multiple working conditions
  • Hydraulic optimization method for flow channel type guide vane of multistage centrifugal pump under multiple working conditions
  • Hydraulic optimization method for flow channel type guide vane of multistage centrifugal pump under multiple working conditions

Examples

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Embodiment

[0039] A three-stage centrifugal pump with a specific speed of 154, its design flow rate is Q d =850m 3 / h, H d =131m, n=1475r / min.

[0040] (1) Build the test bench for the external characteristics of the three-stage centrifugal pump, and measure the flow rate, lift, power and efficiency of the three-stage centrifugal pump under the design conditions.

[0041] The three-stage centrifugal pump is designed by using the design method of single working condition (namely design working condition). Process three-stage centrifugal pumps and build a three-stage centrifugal pump external characteristic test bench. Measure the flow, head, power and efficiency of three-stage centrifugal pumps under design conditions. The flow rate Q of the three-stage centrifugal pump under the design working condition d It is measured by the turbine flowmeter on the pump outlet pipeline system, and its head H d Measured by the pressure sensors at the inlet and outlet of the pump, its power P d M...

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Abstract

The invention belongs to the field of fluid machinery design and discloses a hydraulic optimization method of a flow channel type guide vane of a multistage centrifugal pump under multiple working conditions. The hydraulic optimization method is mainly used for calculating out a vane inlet setting angle of the flow channel type guide vane of the multistage centrifugal pump with highest or lowest weighted average efficiency under the multiple working conditions. The hydraulic optimization method specifically comprises the followings steps: measuring the flow, lift, power and efficiency of the multistage centrifugal pump under the multiple working conditions; solving an iterative mathematical model of the vane inlet setting angle of the flow channel type guide vane by adopting an iterative algorithm and working out a set of solution sets of the inlet setting angle; and carrying out total flow field numerical-calculation on internal flow fields of the multistage centrifugal pump under the multiple working conditions by adopting a CFD technology so as to obtain an optimum value of the guide vane inlet setting angle. The vane inlet setting angle of the flow channel type guide vane of the multistage centrifugal pump, designed by the adopting the method provided by the invention, is more accurate than the inlet setting angle designed under a single working condition, the weighted average efficiency of the multistage centrifugal pump under the multiple working conditions is improved and a reference is provided for optimization of other geometric parameters of the impellers and guide vanes of the multistage centrifugal pump under the multiple working conditions.

Description

technical field [0001] The invention belongs to the field of fluid machinery design, and in particular relates to a multi-working-condition hydraulic optimization method for channel-type guide vanes of a multistage centrifugal pump. Background technique [0002] The two-stage impellers of multi-stage centrifugal pumps are connected by guide vanes. During the hydraulic design of the guide vane blades, especially when drawing the streamline diagram of the outer wall in the later stage, sudden changes or uneven angle changes often occur. It is necessary to modify the guide vane blade inlet placement angle, guide vane blade outlet placement angle and wrap angle to meet the requirement of gentle change of angle. For the channel-type guide vane, a reasonable guide vane inlet placement angle can completely match the guide vane with the upper stage impeller, thereby minimizing the hydraulic loss of the fluid in the transition between the impeller and the channel-type guide vane. At...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/44
Inventor 王凯刘厚林王文博谈明高王勇董亮吴贤芳代翠
Owner JIANGSU UNIV
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