新型低压细水雾喷头设计与优化  

The Design and Optimization of A New Low Pressure Water Mist Nozzle

作　　者：宋伟 杨家明 姜思航 朱柯 刘远周 

机构地区：[1]北方工业大学土木工程学院,北京100144

出　　处：《北方工业大学学报》2017年第5期105-111,共7页Journal of North China University of Technology

基　　金：供热供燃气通风及空调工程北京市重点实验室研究基金(NR2016K03);北方工业大学青年拔尖人才培育计划(XN018032)

摘　　要：本文介绍了细水雾喷头雾化机理,并针对传统细水雾喷头存在的雾化锥角较小、压力较高、保护半径过小的缺点,设计了一种新型低压细水雾喷头.该喷头创新采用了混合旁通管设计和气泡雾化技术相结合的方案,同时在喷头末端配多规格喷嘴、防尘罩、玻璃球等配件.应用连续性方程、动量守恒方程和k-ε湍流模型方程,通过计算流体动力学软件分别进行了单相流和两相流的二维流动数值模拟.模拟结果表明,大约20s后流体趋于稳定,模拟得到喷头腔内到喷嘴处压力渐弱,从0.8MPa衰减到0.1MPa,水雾速度由6m/s加速到大约60m/s,雾化锥角超过15°.结合该喷头结构进行分析,表明该喷头相对传统低压细水雾喷头具有雾化锥角大、作用半径大、轴向动量充足的优点.In this paper,the atomization mechanism of the water mist nozzle is introduced,and a new type of low pressure water mist nozzle is designed to make up for the defects in the traditional water mist nozzle with small atomization angle,high pressure and too small protection radius.The innovation of the nozzle lies in the combination of the techniques of bypass pipe design and bubble atomization.And at the end of the nozzle multi-specification nozzles,dust cover,and glass ball etc.are assembled.The two-dimensional flow numerical simulation of single-phase flow and two-phase flow is carried out with the continuity equation,the momentum conservation equation and the k-εturbulence model equation.The simulation results show that the pressure tends to stabilize after about 20s,and the pressure in the nozzle cavity is weakened from 0.8 MPa to 0.1 MPa.The water mist velocity is accelerated from 6 m/s to about 60 m/s,and atomization cone angle is more than 15°.The analysis of the structure of the nozzle shows that the nozzle has the advantages of large atomization cone angle,large radius of action and sufficient axial momentum.

关 键 词：低压细水雾喷头 结构优化 两相流 气泡雾化 数值模拟 

分 类 号：O351[理学—流体力学] TH128[理学—力学]