摘要
应用Fluent软件,采用Simple算法和SSTk-ω湍流模型,通过求解Navier-Stokes方程和能量方程来模拟迷宫密封腔内部流场及泄漏特性,计算结果与文献中的实验结果进行比较,最大误差为4%,验证了应用Fluent模拟迷宫密封腔内部流场的可靠性。在此基础上,研究了高低齿迷宫密封腔内部流动和泄漏特性,并通过引入修正系数对节流口射流收缩和空腔动能耗散不完善的影响进行了修正,构造了泄漏量计算公式。与现有的同类公式比较,该公式无需通过实验来确定参数,且能够更加准确的计算迷宫密封的泄漏量。
The flow and leakage within labyrinth seal are studied by solving the Navier-Stokes equations and energy equations using the simple methods and the SST k-ω turbulence model in Fluent. According to compare the results of numerical simulation with experimental data in the literature, the reliability of simulating is validated. Based on this, the result of the flow and leakage within a stepped diaphragm labyrinth seal is obtain, and an approximate formula for calculating the leakage which amends the effects of the shrinkage of the restriction jet and the incomplete dissipation of turbulence kinetic energy is given. This formula doesn＇ t need to determine the parameter using experiments and can predict the leakage exactly.
出处
《汽轮机技术》
北大核心
2008年第2期81-84,共4页
Turbine Technology
基金
国家自然科学基金重点项目(10632040)
关键词
汽轮机
迷宫密封
湍流
泄漏量
super critical steam turbine
labyrinth seal
leakage flow
turbulent
