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Similarity principle analysis method for input and output characteristics of fuel cell

A technology of input and output characteristics, fuel cells, applied in fuel cells, special data processing applications, circuits, etc., can solve problems such as lack of generality

Active Publication Date: 2019-11-05
XI AN JIAOTONG UNIV
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Problems solved by technology

However, the horizontal and vertical coordinates of the polarization curve are expressed by classical physical quantities, which is intuitive but lacks generality

Method used

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  • Similarity principle analysis method for input and output characteristics of fuel cell
  • Similarity principle analysis method for input and output characteristics of fuel cell
  • Similarity principle analysis method for input and output characteristics of fuel cell

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Embodiment Construction

[0048] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0049] see figure 1 , taking the single-phase thermal model of the hydrogen fuel cell parallel channel as an example, the method of the present invention is also applicable to other types of fuel cells and other fuel cell models, such as solid oxide fuel cells, non-isothermal models and multiphase models.

[0050] This embodiment includes the following steps:

[0051] 1) Determine the geometric structure parameters, physical parameters, working condition parameters and related combination parameters of the numerical model, as shown in the following table:

[0052] Geometric structure parameters: the dimensioned parameter is the characteristic length l, the unit is m, and the dimensionless parameter is the porosity ε;

[0053] Physical parameters: Dimensional parameters are density ρ, viscosity μ, permeability K, gas diffusion coefficien...

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Abstract

The invention discloses a similarity principle analysis method for input and output characteristics of a fuel cell. On the basis of a given hydrogen fuel cell numerical model, a pi theorem and a similarity principle are used for carrying out dimension analysis and equation analysis on model parameters and a control equation respectively, and the method mainly comprises the steps that the model parameters are determined, dimensions of all the parameters are determined, and the parameters are screened out to serve as basic parameters for dimension analysis; dimension analysis is performed on themodel parameters by utilizing a pi theorem to obtain a dimensionless number; the model control equation is analyzed by utilizing a similarity principle to obtain a dimensionless number; the two dimensionless numbers are compared to determine the dimensionless number of the researched fuel cell model; the dimensionless voltage and the dimensionless current are defined to represent the dimensionless polarization curve, and one point, not only one point, on the dimensionless polarization curve obtained through the analysis method represents a group of similar working conditions, so that the testfrequency and the test time can be greatly reduced in the test stage, and the effect of saving the cost can be achieved.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a similar principle analysis method for the input and output characteristics of fuel cells. Background technique [0002] Hydrogen fuel cells use hydrogen and oxygen as fuel, and can convert the chemical energy of reactants into electrical energy without combustion reaction, and the product is water, so it is a very promising clean energy device. At the same time, its advantages such as no pollution, low noise, and high efficiency make it gradually become a strong competitor for the power source of future energy devices. The output characteristics of fuel cells are affected by dozens of parameters. According to conventional experimental methods, even if each variable is only changed twice and other parameters remain unchanged, at least hundreds of millions of experiments are required. This experimental design method is obviously Unrealistic. How to reduce the num...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/11H01M8/04992
CPCG06F17/11H01M8/04992Y02E60/50G06F30/20G06F2111/10H01M2008/1095G06F30/10H01M8/04305
Inventor 陶文铨雷乐白帆陈黎陈磊屈治国
Owner XI AN JIAOTONG UNIV
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