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以地下水源热泵井回灌中的物理堵塞问题作为研究背景,建立基于质量平衡方程来模拟多孔介质中颗粒的迁移方程和颗粒的沉积造成孔隙损伤的数学模型。该模型充分考虑了颗粒流动速度修正系数、孔隙率修正系数以及颗粒在孔隙里发生捕获率3个因素;模型的建立考虑孔隙率变化的情况,在物质的迁移和堵塞的过程中,孔隙率的变化往往也是个动态的变化过程;与传统的过滤模型相比,考虑了速度折减系数和流量折减系数后新建模型更加系统、全面。该模型为解决回灌井物理堵塞的室内外试验研究提供理论依据。
Taking the problem of physical plugging in groundwater heat pump well recharging as a research background, a mathematical model was established based on the mass balance equation to simulate the migration equation of particles in porous media and the deposition of particles. The model takes full account of the particle flow velocity correction coefficient, porosity correction coefficient and particle capture rate in the pores of three factors; model to consider changes in porosity, the material migration and plugging process, the porosity Changes are often also a dynamic process of change. Compared with the traditional filtering model, the new model is more systematic and comprehensive considering the speed reduction coefficient and traffic reduction factor. The model provides a theoretical basis for solving the indoor and outdoor experimental research on the physical blockage of injection well.