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Organic Rankine cycle centripetal turbine flow loss diagnosis method based on entropy production theory and Omega technology

A Rankine cycle and flow loss technology, applied in image data processing, electrical digital data processing, computer-aided design, etc., can solve problems affecting the accuracy of vortex identification results, and achieve the effect of improving identification accuracy

Inactive Publication Date: 2022-02-18
XIANGTAN UNIV
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Problems solved by technology

[0006] At the same time, existing studies often use the Q criterion to analyze the internal flow structure of fluid machinery, but this method will identify the strong shear layer on the wall as a vortex, which greatly affects the accuracy of the vortex identification results

Method used

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  • Organic Rankine cycle centripetal turbine flow loss diagnosis method based on entropy production theory and Omega technology
  • Organic Rankine cycle centripetal turbine flow loss diagnosis method based on entropy production theory and Omega technology
  • Organic Rankine cycle centripetal turbine flow loss diagnosis method based on entropy production theory and Omega technology

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Embodiment Construction

[0061] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0062] See attached figure 1 The flow chart shown in the figure introduces the basic process of the flow loss diagnosis method of the organic Rankine cycle centripetal turbine of the present invention. Other impeller rotating machines such as centrifugal compressors, pumps, axial flow turbines, etc. can also refer to the flow loss diagnosis method. process. The method proceeds as follows:

[0063] (1) According to the operating conditions of the organic Rankine cycle, input the initial parameters: turbine inlet pressure 1200kPa, inlet temperature 393.15K, outlet pressure 240kPa, circulating working fluid is R245fa;

[0064] (2) Establish the mathematical model of the one-dimensional aerodynamic design of the centripetal turbine, use Matlab to write the calculation program of the turbine design, and design the turbine according to the input initial parameter...

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Abstract

The invention discloses an organic Rankine cycle centripetal turbine flow loss diagnosis method based on an entropy production theory and an Omega technology. The method comprises the following steps: firstly, carrying out one-dimensional design on basic parameters of the centripetal turbine according to circulating operation parameters and working media; secondly, establishing a three-dimensional model of the turbine, completing grid division, and then determining the reasonable grid number through grid independence verification; then, carrying out numerical simulation on an internal flow field of the centripetal turbine according to design conditions; on the basis, obtaining distribution of local entropy production and integral entropy production through the entropy production theory, and determining the high-loss area of the turbine; and finally, utilizing the Omega technology to identify a vortex structure in the turbine, comparing the vortex structure with entropy production distribution, and determining a main vortex structure generating flow loss. The flow loss in the turbine and the correlation between the flow loss and the vortex structure are analyzed through the entropy generation theory and the Omega technology, accurate diagnosis of the flow loss of the centripetal turbine is achieved, and theoretical guidance is provided for turbine structure improvement and efficiency improvement.

Description

technical field [0001] The present invention relates to a diagnostic method for organic Rankine cycle centripetal turbine flow loss based on entropy production theory and Omega method, which is suitable for the diagnosis and analysis of organic Rankine cycle turbine flow loss and belongs to the internal flow loss mechanism of expander. technology field. Background technique [0002] Organic Rankine cycle utilizes low-boiling point organic working fluid to absorb heat energy and convert it into mechanical energy or electrical energy, which is a very promising medium-low temperature waste heat power generation technology. Among the components of the Organic Rankine cycle, the internal avoidable (exergy) loss of the expander is the highest and has the greatest potential for improvement, and is the core component of the system. Compared with positive displacement and axial flow expanders, the radial turbine has the advantages of compact structure, small flow rate and large sing...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F30/17G06F30/28G06T17/00G06F111/10G06F113/08G06F119/14
CPCG06F30/23G06F30/28G06F30/17G06T17/00G06F2111/10G06F2113/08G06F2119/14
Inventor 王志奇赵亚斌谢宝琦
Owner XIANGTAN UNIV
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