二次加压对重型粉剂举高喷射消防车粉剂喷射效果的影响  

Influence of secondary pressurization on the powder spraying effect of heavy-duty powder elevating fire trucks

作　　者：肖俏伟 万里添 张竟 颜龙[2] Xiao Qiaowei;Wan Litian;Zhang Jing;Yan Long(Sany Automobile Manufacturing Co.Ltd.,Hunan Chang-sha 410100,China;Institute of Disaster Prevention Science and Safety Technology,Central South University,Hunan Chang-sha 410075,China)

机构地区：[1]三一汽车制造有限公司,湖南长沙410100 [2]中南大学防灾科学与安全技术研究所,湖南长沙410075

出　　处：《消防科学与技术》2024年第2期221-226,共6页Fire Science and Technology

基　　金：湖南省重点研发计划项目(2020SK2057,2021SK2054)。

摘　　要：针对重型粉剂举高喷射消防车粉剂喷射距离不足的问题,提出利用二次加压提升重型粉剂的喷射距离,并通过理论分析、数值模拟和试验研究分析了二次加压的位置、加压口数量和压力对举高喷射消防车粉剂喷射效果的影响和规律。研究表明,相比于直接提升主驱动气源压力,利用输运管道进行二次加压能更有效地减少气固两相流压损以提升粉剂的出口速度和射程。加压口位置对粉剂喷射射程有较大影响,而在臂架中部靠上的位置进行二次加压的粉剂喷射效果相比于臂架两端加压更好。粉剂喷射距离随加压压力增大而提高,以0.15 MPa在中部臂架进行二次加压可使粉剂的最大出口速度和粉剂有效覆盖率分别提升61.8%和28.4%,表现出最佳的喷射效果。In view of the problem of insufficient powder spraying distance of heavy-duty powder fire trucks,it is proposed to use secondary pressurization to improve the spraying distance of heavy-duty powder,and the influence of the position of second-ary pressurization,the number of pressurized ports and the pres-sure on the spraying effect of powder in fire trucks is analyzed through theoretical analysis,numerical simulation and experimen-tal study.Research indicates that,compared with directly raising the pressure of the main driving gas source,the secondary pres-surization through the transportation pipeline can more effectively reduce the pressure loss of gas-solid two-phase flow to enhance the exit velocity and range of the powder.The position of the pres-surized port has a greater impact on the powder injection range,and the powder injection effect of secondary pressurization in the middle of the boom is better than that of pressurization at both ends of the boom.The powder injection distance increases with the increase of pressurization pressure,and the secondary pressur-ization at 0.15 MPa in the middle of the boom can increase the maximum exit velocity and effective powder coverage by 61.8%and 28.4%,respectively,showing the best injection effect.

关 键 词：举高喷射消防车 气力输送 二次加压 喷射距离 气固两相流 

分 类 号：TU998.131[建筑科学—市政工程] TE88[石油与天然气工程—油气储运工程]