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A Kinetic Estimation Method for Wind Erosion Release Factor of Open Particle Sources

A release factor and open technology, applied in the field of dynamic estimation, can solve problems such as selection confusion, no direct determination of frictional wind speed, lack of dust release mechanism, etc., and achieve the effect of broad applicability

Inactive Publication Date: 2011-12-21
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

Due to the lack of in-depth research on the mechanism of dust release, the selection of important dynamic parameters such as frictional wind speed, water content, particle initiation threshold, surface roughness, and shear stress in actual estimation is very confusing, and the problem of source strength estimation has not been resolved
So far, there are no literature reports directly determining the frictional wind speed

Method used

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  • A Kinetic Estimation Method for Wind Erosion Release Factor of Open Particle Sources
  • A Kinetic Estimation Method for Wind Erosion Release Factor of Open Particle Sources
  • A Kinetic Estimation Method for Wind Erosion Release Factor of Open Particle Sources

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Embodiment Construction

[0035] Select the particle source, establish an open-air open particle source physical model, and design an appropriate calculation domain to determine the entrance and side wall conditions necessary for the calculation, specifically as figure 1 shown.

[0036] Use non-uniform tetrahedral grids to divide the calculation domain space around the particle source, and follow the principle of "near wall encryption", that is, the area close to the physical model of the particle source adopts fine grids, and the distance uses sparse grids, such as figure 2 shown. Afterwards, the sensitivity verification of the grid division method is carried out until the influence of the grid division method on the calculation results is controlled at ≤ 5%.

[0037] The steady-state k-ε two-equation turbulence mathematical model is selected, the governing equation is written as a general conservation equation, the equation is discretized into a difference equation by the finite volume method, and ...

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Abstract

The invention discloses a dynamic estimation method for an open-air and open particle source wind erosion release factor, which belongs to the atmospheric particulate matter control technical field of the environmental science and engineering technical field, wherein an aerodynamic computing method is adopted; and by computing flow field distribution when wind blows around a particle source and by being combined with an experimental verification, the action height of a friction wind velocity is confirmed, the friction wind velocity value in each grid subregion on the surface of the particle source is obtained, the obtaining problem of the friction wind velocity value is solved and then the release factor can be obtained through computation. Compared with a traditional source strength estimation method, i.e. the environmental protection agency (EPA) pattern, which is provided by the EPA and is based on experimental measurement, the error delta of the invention is kept between 6.0 percent and 12.5 percent and the invention has higher precision.

Description

technical field [0001] The invention relates to a dynamic estimation method for the wind erosion release factor of an open particle source in the open air, and belongs to the technical field of atmospheric particle control in the field of environmental science and engineering technology. Background technique [0002] For a long time, the quantification of the emission intensity of atmospheric particulate matter in the environmental field has been the focus of debate among experts and scholars. The basis for comparative evaluation is also the focus and center of research in the field of atmospheric control, and its calculation and determination have attracted much attention. [0003] The source apportionment results of atmospheric particulate matter in several cities carried out successively in the 1990s showed that open particle sources have become one of the main sources of atmospheric particulate matter. In the northern cities of our country, the sharing rate of open sour...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 丛晓春陈志龙杨树利戴明新曹世青詹水芬孙旭杰彭士涛
Owner SHANDONG UNIV OF SCI & TECH
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