Improvement Method of Centrifugal Compressor Bend Based on Energy Gradient Theory

A centrifugal compressor, energy gradient technology, applied to the components of the pumping device for elastic fluid, mechanical equipment, machines/engines, etc. The effect of convenient design, improved efficiency and stability

Active Publication Date: 2017-10-31
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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  • Improvement Method of Centrifugal Compressor Bend Based on Energy Gradient Theory
  • Improvement Method of Centrifugal Compressor Bend Based on Energy Gradient Theory
  • Improvement Method of Centrifugal Compressor Bend Based on Energy Gradient Theory

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Embodiment Construction

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

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

[0034] Step 1. Simulate 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, Vol. 5, No. 41), the value of the energy gradient function K in the model stage of the centrifugal compressor is The calculation formula is:

[0037]

[0038] In formula (1), is the total pressure of the fluid, p is the hy...

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Abstract

The invention discloses a method for improving the curve of a centrifugal compressor based on the energy gradient theory. Reasonable curve design can improve the overall operating efficiency of the centrifugal compressor. The steps of the present invention: simulate the flow physical parameters in the model stage of the centrifugal compressor; find the most unstable position of the flow in the bend according to the size of the energy gradient function value at each position of the bend, and divide the second half of the bend into an arc-shaped meridian The shaped line is improved into a right-angled lead-angle meridian-shaped line, which includes a circular arc segment and two straight line segments respectively connected to the two ends of the circular arc segment; recalculate the energy gradient function value of the most unstable position of the bend flow , to optimize the best radius of the arc section of the meridian of the right-angle chamfer of the bend. The present invention determines the optimal meridian line by comparing the arc section of the meridian line of the right-angle leading angle of the bend at different radii of the internal energy gradient function value of the bend; the improved bend can reduce the unstable flow in the bend, Flow instabilities in the reflux will also be improved.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D29/44
Inventor 窦华书郑路路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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