Gob air leakage flow field dynamic numerical simulation method based on deformation geometry

Abstract

The invention provides a gob air leakage flow field dynamic numerical simulation method based on deformation geometry. The method comprises the steps that an initial gob geometric model for mining on a coal face is established according to a gob formed after mining is conducted for one day at the daily average promoting speed; a free deformation area, a fixed boundary and a moving boundary of the gob are arranged; a gob air leakage flow field is arranged; the initial gob geometric model is divided into boxes, and gob air leakage flow field numerical simulation calculation is carried out; the gob geometric model is promoted step by step at the daily average promoting speed and is divided into boxes again, and gob air leakage flow field numerical simulation calculation is carried out till the gob geometric model is promoted to a stop line or the gob geometric model does not arrive at the stop line but the set calculation stop time is up. According to the method, deformation geometry is adopted for controlling the dynamic evolution process of boundary movement and area changes of the coal face and the gob, and a free and porous medium fluid flow control working face and the flow field of the gob are coupled to calculate and describe the dynamic change and distribution law of the gob air leakage flow field.

Description

technical field [0001] The invention relates to the technical field of air leakage simulation in goaf, in particular to a dynamic numerical simulation method of air leakage flow field in goaf based on deformation geometry. Background technique [0002] Air leakage in the goaf is an important factor affecting the safe mining of the working face. Air leakage causes the coal left in the gob to spontaneously ignite and induces a large amount of toxic and harmful gases in the gob to flow out to the working face. Provide theoretical basis and technical support. The commonly used numerical calculation and simulation methods of stope wind flow field are earlier mainly include the self-programmed stope flow field calculation method based on FORTRAN language in the 1980s and 1990s, the G3 software simulation method and the dual coordinate system since the 21st century. method, moving coordinate system method, as well as the commonly used commercial software PHOENICS, fluent, comsol a...

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Problems solved by technology

The commonly used methods for calculating and simulating the stope wind flow field earlier mainly include the self-programmed stope flow field calculation method based on FORTRAN language in the 1980s and 1990s, and the G3 software simulation method and dual-coordinate system simulation method since the 21st century. method, moving coordinate system method, and common commercial software PHOENICS, fluent, comsol and other methods. The above methods have improved the theoretical calculation level of stope flow field to a certain extent for the simulation calculation of goaf flow field. Safety production provides guidance, but some of these methods cannot realize the dynamic changes of the goaf during the advancing process of the working face, and some of them are based on self-programmed development. The technical and theoretical difficulties are relatively difficult, which has certain limitations in the promotion and application of this industry

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