汽轮机调节阀通流及损失特性研究  

Investigation on Flowrate and Total Pressure Loss of Flow Through Steam-Turbine Control Valve

作　　者：相晓伟[1] 毛靖儒[1] 孙弼[1] 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《西安交通大学学报》2006年第7期762-766,共5页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金专项基金资助项目(50323001)

摘　　要：依据厂方提供的设计数据,在不同升程、不同压比条件下对汽轮机调节阀三维流场特性进行了数值模拟.研究结果表明:阀碟下方的空穴区占据了阀座喉部通流面积的一部分,使得有效的通流面积减小,影响了阀门的通流能力;阀碟附近是整个流场中全压损失最大的区域,占调节阀总损失的60%以上,阀腔以及阀座扩压段内的全压损失相对较小;在相对升程小于6%、压比小于0.7后,环形通道的末端将产生激波,激波带来较大的全压损失.为了提高额定工况下调节阀的通流能力,建议其相对升程应尽可能地提高.Three-dimensional flow characteristics of the control valve for steam turbine under the different pressure ratio and relative lift were investigated by numerical simulation with the design data provided by a manufacturer. The results show that a part of the flow passage of the valve seat is occupied by the cavity under the valve head, leading to a decrease of flow rate. The energy loss near the valve head is maximal and accounts for 60% of the total loss. At the end of the annular passage, shock wave occurs when the relative lift is less than 6% and the pressure ratio is less than 0. 7, which causes a greater total pressure loss. In order to increase the flowrate of the control valve operating under nominal working condition, the relative lift should be higher.

关 键 词：汽轮机调节阀 通流能力 全压损失 

分 类 号：TK263.7[动力工程及工程热物理—动力机械及工程]