摘要
采用体积分数(VOF)方法开展旋流式喷嘴内部流场分析,并设计了仿真和试验方案,对额定压差40.8 kPa、额定质量流量11.38 kg/s、边缘喷雾角80°的某核电厂稳压器喷嘴进行了结构优化设计。结果表明:旋流式喷嘴内流场呈漩涡运动特性,旋水芯结构对喷嘴内压力和速度场具有决定作用;槽深是导致空心锥形喷雾的最关键因素,适当增加槽数、槽深和螺旋升角可优化喷雾角和雾化颗粒度,必要时增加补充流道可显著改善喷雾均匀性;喷嘴的流量和压差特性符合伯努利方程,试验结果与数值模拟结果吻合;采用数值方法进行喷雾特性精细化设计,可节省旋流式喷嘴试制阶段的试验迭代,为各种工业运用场合同类喷嘴设计提供思路。
Volume of fraction(VOF)method was used to analyze the internal flow field of a swirl nozzle,and a simulation and experimental schemes were designed.The structure optimization design of a nuclear power plant regulator nozzle with rated pressure drop of 40.8 kPa,rated flow rate of 11.38 kg/s and spray angle of 80°was carried out.Results show that the flow field in the swirl nozzle has the characteristics of vortex motion,and the structure of the swirl core plays a decisive role in the pressure and velocity field in the nozzle.Groove depth is the most critical factor in the formation of hollow conical spray.The spray angle and particle size can be optimized by increasing the number of grooves,the depth of grooves and the spiral angle.If necessary,the spray uniformity can be significantly improved by adding additional fluid channel.The flow and pressure drop characteristics of the nozzle meet Bernoulli equation,and the experimental results are in good agreement with the numerical simulation results.The numerical method for design of spray characteristics can save the test iteration in the trial-manufacture stage of the swirl nozzle,and provide ideas for the design of similar nozzles in various industrial applications.
作者
浦承皓
丁志伟
沈远娴
施栋
PU Chenghao;DING Zhiwei;SHEN Yuanxian;SHI Dong(Nuclear and Radiation Safety Center,Beijing 100082,China;Shanghai Nuclear Engineering Research&Design Institute,Shanghai 200233,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2022年第12期1230-1236,共7页
Journal of Chinese Society of Power Engineering
关键词
旋流式喷嘴
VOF方法
喷雾特性
数值模拟
swirl nozzle
VOF method
spray characteristics
numerical simulation
