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Method for improving curved channel of centrifugal compressor on basis of energy gradient theory

A technology of centrifugal compressors and energy gradients, which is applied to components, mechanical equipment, machines/engines, etc. of pumping devices for elastic fluids, and can solve problems such as airflow turbulence and compressor efficiency decline

Active Publication Date: 2015-12-09
嘉兴笼列电子商务有限公司
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Problems solved by technology

Experimental research results show that the gas flowing out of the diffuser is turbulent, and the efficiency of the compressor can be reduced by 5% before it enters the reflux through the bend

Method used

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  • Method for improving curved channel of centrifugal compressor on basis of energy gradient theory
  • Method for improving curved channel of centrifugal compressor on basis of energy gradient theory
  • Method for improving curved channel of centrifugal compressor on basis of energy gradient theory

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] like figure 1 As shown, the improvement method of the centrifugal compressor curve based on the energy gradient theory, the specific steps are as follows:

[0034] Step 1, simulating the flow physical parameters in the centrifugal compressor model stage;

[0035] Step 2. Calculate the energy gradient function value K of the flow field inside the bend of the centrifugal compressor model stage. The specific calculation process is as follows:

[0036] According to the energy gradient theory (see the paper "Mechanism of Flow Instability and Transition to Turbulence", Dou Huashu, International Journal of Nonlinear Mechanics, 2006, Volume 5, Issue 41), the calculation formula of the energy gradient function value K in the centrifugal compressor model stage is:

[0037] K = ∂ E / ...

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Abstract

The invention discloses a method for improving a curved channel of a centrifugal compressor on the basis of an energy gradient theory, wherein a reasonable design for the curved channel is capable of improving the overall running efficiency of the centrifugal compressor. The method disclosed by the invention comprises the following steps: simulating flowing physical parameters in a model stage of the centrifugal compressor; finding a position with the most instable flowing in the curved channel according to the energy gradient function values of various positions in the curved channel, improving the second half of arc-shaped meridianal contour of the curved channel to be a right-angled lead angle-shaped meridianal contour which comprises an arc section and two straight-line sections connected with the two ends of the arc section respectively; and re-calculating the energy gradient function value of the position with the most instable flowing in the curved channel, and optimizing the optimal radius of the arc section of the right-angled lead angle-shaped meridianal contour of the curved channel. According to the method disclosed by the invention, the optimal meridianal contour is determined by comparing the energy gradient function values of the arc section of the right-angled lead angle-shaped meridianal contour of the curved channel under different radiuses; and the improved curved channel is capable of reducing instable flowing in the curved channel, and also improving flowing instability in a backflow device.

Description

technical field [0001] The invention belongs to the technical field of ventilation equipment, and in particular relates to a method for improving the curve of a centrifugal compressor based on the energy gradient theory. Background technique [0002] Turbo machinery occupies a very important position in the national economy, especially in the entire heavy industry system. At the same time, the use of impeller machinery consumes a huge amount of energy. Therefore, it is of great significance to improve the efficiency of impeller machinery, expand its operating range, and improve the safety and reliability of operation to improve the level of industrial development in our country. [0003] Centrifugal compressor is a kind of impeller machinery and plays an important role in the national economy. As an energy conversion device, it mainly drives the movement of the gas in the flow channel of the impeller through the rotation of the impeller, and converts the mechanical energy o...

Claims

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Application Information

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IPC IPC(8): F04D29/44
Inventor 窦华书张滨炜魏义坤陈小平
Owner 嘉兴笼列电子商务有限公司
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