基于钟罩型风帽实验建立数值计算模型，对风帽内部压力损失集中程度展开分析并提出风帽增、减阻力改造方案，针对不同直径的节流钢和开孔孔径展开研究，结果表明：增阻力改造时，风帽流量随着节流钢直径增大而减小且减幅逐渐增大，当节流钢直径从0 mm增加至35 mm时，风帽流量仅减低2.4%；当节流钢直径从35 mm增至50 mm时，风帽流量减幅增至14.8%。减阻力改造时，风帽流量随着开孔直径增大而增大且增幅逐渐减小，当开孔直径从0 mm增加到35 mm时，风帽流量增加14.7%；当进一步增加开孔直径至55 mm时，减阻力改造效果增加不明显。

Based on bell-shaped blast cap experiment,the pressure loss in the blast cap was analyzed by numerical calculation. The blast cap modification schemes for higher or lower resistance were proposed. Throttle opening and opening-hole with different diameter were also investigated. Results showed that for the higher resistance scheme,air flow decreases with the increase in throttle diameter,while its decrement increases. Air flow is reduced only by 2.4% when throttle diameter is increased from 0 to 35 mm,while it is reduced by 14.8% when the throttle diameter is further increased to 50 mm. For the lower resistance scheme,air flow increases with openinghole diameter,while the increment decreases. Air flow of blast cap is increased by 14.7% when the opening-hole diameter is increased from 0 to 35 mm,while it is nearly constant when the opening-hole diameter is further increased to 55 mm.

TK229.6

国家自然科学基金重点项目(No.51436006)