摘要
本文数值分析了层流和湍流两种流态下盘式透平的流动特性,并与实验结果进行了对比,考核了数值方法,重点分析了盘片转速对盘式透平流动特性的影响。结果表明:层流模型的数值计算结果与实验结果最接近,适于盘式透平的流动特性分析;盘式透平各部件损失规律与常规透平存在差异;随着轮盘转速提高,喷嘴损失基本保持不变,而轮盘损失系数先减小后增大,余速损失系数持续增加,这与常规透平不同;轮盘损失决定了盘式透平总损失的大小,在轮盘损失达到最小时,透平等熵效率达到最大值。
Flow characteristics of the Tesla turbine were investigated under the laminar and turbulent flow patterns in this paper,and the results were compared with those of the experiment to verify the numerical methods.Especially the effects of the rotor rotational speed on the Tesla turbine＇s flow characteristics were analyzed in details.The results indicate that laminar flow is appropriate for the numerical analysis of Tesla turbines due to the minimal difference between computational and experimental results.The component energy loss rules of Tesla turbines differ from those of conventional turbines.With increasing rotor rotational speed,the nozzle energy loss of Tesla turbines retains constant basically,while the disc energy loss decreases and then increases,and leaving velocityenergy loss increases,which are different from those of conventional turbines.The total loss of Tesla turbines depends on disc loss,and the isentropic efficiency of Tesla turbines reaches the maximum when the disc energy loss gets its minimum.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2015年第10期2122-2126,共5页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51376143)
教育部博士点新教师基金资助项目(No.20120201120066)
关键词
盘式透平
数值方法
流动特性
等熵效率
Tesla turbine
numerical method
flow characteristics
isentropic efficiency
