基于离散粒子曳力分析的消防水射流落点修正方法

消防科学与技术 ›› 2023, Vol. 42 ›› Issue (3): 324-327.

基于离散粒子曳力分析的消防水射流落点修正方法

蒋子奕1,3，杨锦涛1,2,3，李富伟1,2,3，李伟4

（1.长沙矿山研究院有限责任公司，湖南长沙410012；2.金属矿山安全技术国家重点实验室，湖南长沙410012；3.国家安全生产长沙矿山机电检测检验中心，湖南长沙410012；4.中国矿业大学机电工程学院，江苏徐州221116）

出版日期:2023-03-15 发布日期:2023-03-15
作者简介:蒋子奕（1996－），男，安徽淮南人，长沙矿山研究院有限责任公司工程师，主要从事矿山机电设备安全保护、过程工业承压设备安全保护、密闭空间火灾灭火技术研究，湖南省长沙市岳麓区麓山南路343号，410012。
基金资助:
湖南省应急管理科技项目（2021-QYC-3500305-25877）

Drop point correction method of fire water jet based on discrete particle drag analysis

Jiang Ziyi1,3, Yang Jintao1,2,3, Li Fuwei1,2,3, Li Wei4

(1. Changsha Institute of Mining Research Co., Ltd., Hunan Changsha 410012, China; 2. State Key Laboratory of Metal Mine Safety Technology, Hunan Changsha 410012, China; 3. National Safety Test Center of Changsha Mine Electromechanical Equipment, Hunan Changsha 410012, China; 4. School of Mechanical and Electrical Engineering, China University of Mining and Technology, Jiangsu Xuzhou 221116, China)

Online:2023-03-15 Published:2023-03-15

摘要/Abstract

摘要： 为提高现有消防水射流落点定位预测的精度，降低计算强度，提高计算效率，依据现有水射流稳定阶段径向剖面射流微元体积内质量分布的研究结果，以微元体内平均密度为自变量构建曳力主导的射流微元体动力学微分方程，并借助MATLAB GUI计算模块，获得不同平均密度的射流微元体的理论射流轨迹与预期落点。并在此基础上，通过预期落点与理论火源点的加权误差距离对消防水射流的落点综合修正，实现实际水射流空间落点范围有效覆盖面状火源，达到快速灭火的目的。采用人工设置8 m外油盆火源作为预测方法的测试对象，通过测试射流灭火速度与射流角度控制指令输出时间验证控制效果。结果表明，采用该方法后，输出指令时间约为0.12 s；灭火时间约为2.6 s，最快可达0.097 s。

关键词: 射流落点, 加权误差距离, 空气曳力, 火点覆盖效果, 灭火速度

Abstract: Abstract: In order to improve the accuracy of the prediction of the drop point of the existing fire water jet, reduce the calculation intensity and improve the calculation efficiency, the mass distribution in the volume of the radial profile jet element in the current water jet stability stage was studied. Taking the average density inside the cell as the independent variable, the drag-dominated dynamic differential equation of jet cell was constructed, and the theoretical jet trajectory and expected landing point of jet cell with different average density were obtained by MATLAB GUI. On this basis, through the weighted error distance between the expected drop point and the theoretical fire source point, the drop point range of the actual water jet space can effectively cover the fire source, and achieve the purpose of rapid fire suppression. An 8 m external fire source was set manually as the test object of the prediction method, and the control effect was verified by testing the effluent extinguishing speed and effluent angle control instruction output time. The results show that the output instruction time is generally about 0.12 s; the fire extinguishing time is about 2.6 s, the fastest is up to 0.097 s.

Key words: Key words: jet drop point, weighted error distance, air drag, fire coverage effect, fire extinguishing speed

蒋子奕, 杨锦涛, 李富伟, 李伟. 基于离散粒子曳力分析的消防水射流落点修正方法[J]. 消防科学与技术, 2023, 42(3): 324-327.

Jiang Ziyi, Yang Jintao, Li Fuwei, Li Wei. Drop point correction method of fire water jet based on discrete particle drag analysis[J]. Fire Science and Technology, 2023, 42(3): 324-327.