Effects of Geometric Parameters on Air Suction Characteristics of a New Jet-Type Foam Generator for Mine Dust Suppression

摘要

This paper proposes a novel jet-type foam generator of air self-suction intended for dust control in coal mines that overcome the shortcomings of conventional compressed air foam preparation devices. Three non-dimensional numbers of geometric parameters were obtained through theoretical analysis, namely distance-diameter ratio (, length-diameter ratio (, and area ratio (. And various experiments were conducted to investigate the effects of the three important non-dimensional geometric parameters on air suction properties of the proposed foam generator. The results show that air suction capacity first increases and then decreases with the increasing of and , and air-water ratio increases with the increasing of . And the optimum distance-diameter ratio is identified to be 1/3-2/3, the optimum length-diameter ratio is approximately 20, and the optimum area ratio should be 81-144. This study provides a solid foundation for application of the proposed foam preparation technology.