导流环倾角对汽轮机排汽缸气动性能影响的研究  

Study of Tilt Angle Impact of Flow Deflector Ring on Aerodynamic Performance of Exhaust Hood in Steam Turbine

作　　者：曹丽华[1] 林阿强 李勇[1] 

机构地区：[1]东北电力大学能源与动力工程学院

出　　处：《化工机械》2016年第2期199-203,共5页Chemical Engineering & Machinery

基　　金：吉林省科技发展计划基金资助项目(20140204040SF)

摘　　要：以某300MW汽轮机为研究对象，应用Fluent软件对不同来流条件下的排汽缸进行三维数值模拟，分析导流环倾角变化对排汽缸性气动性能影响。结果表明：在扩压管导流环轴向长度不变的情况下，随着导流环倾角的不断增大，总压损失系数和静压恢复系数呈单调变化。导流环倾角在20～30。区间时，扩压管的性能处于平缓趋势。排汽缸来流有较大的旋流有利于提高排汽缸的气动性能，而较小的旋流则会带来一定的流动损失。Taking a 300MW steam turbine as the object of study, the Fluent software was applied to dimen- sionally simulate the flow field of the exhaust hood under different inlet conditions and analyze the tilt angle changes＇ impact on the exhaust hood＇ s aerodynamic performance. The results show that both total pressure loss coefficient and static pressure recovery coefficient of the exhaust hood changes monotonously with the in- crease of flow guide＇ S tilt angle when the axial length of the diffuser remains unchanged ; when the flow deflec- tor ring＇ s tilt angle stays at 20°~ 30°, the diffuser performance has a flat trend. The greater swirl flow in the exhaust hood can help improve the aerodynamic performance of the exhaust hood while smaller swirl flow brings on some flow loss.

关 键 词：汽轮机 排汽缸 导流环倾角 气动性能 

分 类 号：TQ051[化学工程]