摘要
应用商业软件FLUENT6.2对600MW超临界汽轮机组的调节阀流场进行了全三维流动分析。利用UG实体建模软件对调节阀进行三维成型,通过Gambit网格划分软件对区域进行非结构化网格划分。在三维数值计算中,模拟分析了调节阀在100%、50%和30%三个工况开度下的流场特性。计算结果表明,由阀碟与阀座组成的环型通道是决定调节阀的主控通流能力、流场特性和稳定性三项气动性能的关键部位。文中所研究的调节阀的阀碟采用了内凹型设计,汽流自喉部喷射后,迅速脱离阀碟,并在阀座的曲线收敛段形成附着流,避免了流经阀碟表面的周向流体的过早掺混带来的能量损失。阀碟独特的结构设计使得调节阀在各种工况开度下有着较稳定的流动状态。
The commercial code FLUENT6.2 is used to calculate a three-dimensional steady flow field of control valve of 600MW super-critical steam turbine. Modeling the entity of control valve by UG3.0 and producing the unstructured mesh by Gambit software. In this 3D computation, three different loads are simulated ： 100% ,50% ,30%. The throat area of control valve decides the ability of controlling, flow characteristics and stability. The valve disc of this control valve adopts the inside recess design, so the steam disengages quickly the valve disc when the steam goes through the throat. At the same time, steam produces the attachment flow on the valve base curve convergence segment. So the unique structure of valve disc decreases the energy loss and improves flow stability under different work conditions.
出处
《科学技术与工程》
2009年第13期3781-3784,共4页
Science Technology and Engineering
关键词
汽轮机
调节阀
三维定常流动
数值模拟
steam turbine
control valve
three-dimensional steady flow field
numerical simulation
