Method for designing blade inlet installing angle of flow channel type guide blade of multistage centrifugal pump

A technology of guide vane and design method, which is applied in the directions of calculation, special data processing application, instrument, etc., can solve the problems such as public reports on the design method of the inlet angle of the guide vane of the flow channel type guide vane of the multistage centrifugal pump.

Active Publication Date: 2015-12-30
JIANGSU UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] So far, there has been no public report on the design method of the inlet placement angle of t

Method used

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  • Method for designing blade inlet installing angle of flow channel type guide blade of multistage centrifugal pump
  • Method for designing blade inlet installing angle of flow channel type guide blade of multistage centrifugal pump
  • Method for designing blade inlet installing angle of flow channel type guide blade of multistage centrifugal pump

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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) The multistage centrifugal pump is designed using the design method of single working condition (that is, the design working condition). Process multistage centrifugal pumps, and build a test bench for external characteristics of multistage centrifugal pumps.

[0041] The head, power and efficiency of multistage centrifugal pumps were measured under three working conditions. 0.6Q d , Q d , 1.2Q d Flow Q of multistage centrifugal pump under three working conditions i It is measured by the turbine flowmeter on the pump outlet pipeline system, and its head H i Measured by the pressure sensors at the inlet and outlet of the pump, its power P i Measured by electrometry, its efficiency η i by the formula η i =ρgQ i h i / P i Calculated, where i is three operating points, i=1, 2, 3; ρ is the density of water; g is the accelerati...

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Abstract

The invention belongs to the field of fluid mechanical design and discloses a method for designing a blade inlet installing angle of a flow channel type guide blade of a multistage centrifugal pump. The method comprises the steps of setting up a multistage centrifugal pump external characteristic experiment table, measuring flow, lift, power and efficiency of the multistage centrifugal pump under various working conditions; adopting a global optimization algorithm to solve a mathematic model of a blade inlet installing angle alpha 1 of the flow channel type guide blade of the multistage centrifugal pump, and obtaining a Pareto solution of the blade inlet installing angle alpha 1 of the flow channel type guide blade; adopting a CFD technology to perform all flow field numerical calculation on a flow field in the multistage centrifugal pump under each working condition, and working out the weighted average of the multistage centrifugal pump under each working condition; and if the calculated weighted average under multiple working conditions does not meet the requirements, repeating global optimization until the requirements are met, so as to obtain the optimal solution of the installing angle alpha 1. According to the method, not only can the blade inlet installing angle of the flow channel type guide blade of the multistage centrifugal pump be calculated accurately, but also energy saving transformation can be performed on existing multistage centrifugal pumps on the basis.

Description

technical field [0001] The invention belongs to the field of fluid machinery design, and in particular relates to a design method for the placement angle of the inlet of a multistage centrifugal pump channel type guide vane vane. 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 pr...

Claims

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Application Information

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IPC IPC(8): G06F17/50
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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