摘要
为了探究MVR蒸汽离心风机在变工况时的运行性能,采用Fluetn软件,选用RNG k-ε湍流模型,对MVR蒸汽离心风机进行了数值模拟研究,研究了风机变工况流量为3.6 t/h、7.2 t/h、10.8 t/h、15 t/h、21.6 t/h、25.22 t/h的内部流场流动规律。研究结果表明:当风机进口流量降至7.2 t/h,气流在叶道内将产生边界层分离,风机发生旋转失速现象,风机效率将急剧降至56.4%;当流量继续降低至3.6 t/h,风机将发生喘振现象,风机的效率将急剧降低至35.6%;当风机进口流量达到25.22 t/h,风机不会发生边界层分离,但随着流量的增加,叶片气流速度会增加,流动损失增大,风机的效率降至59.3%。因此,MVR蒸汽离心风机在变流量工况运行时,效率将下降,在小流量工况下边界层分离是风机发生喘振现象的根本原因。
In order to explore the operating performance of MVR steam centrithgal fan under variable flow conditions. Fluent software and RNG k - 8 turbulent model was used to simulate the flow field of MVR steam centrifugal fan when the flow rate is 3.6,7.2,10.8,15,21.6,25.22 t/h respectively. The results shows that when the inlet flow rate drop to 7.2 t/h, the boundary layer separation and fan rotating stall phenomenon occurs, the efficiency of the fan dramatically reduces to 56.4%. When the flow rate contin- ue to reduce to 3.6 t/h, fan surge phenomenon occurs, the efficiency of the fan dramatically reduces to 35.6%. When the inlet flow rate reaches to 25.22 t/h, the boundary layer separation does not occur, but the flow loss increases with increase of flow rate and the velocity through the blades, the efficiency of the fan would be as low as 59.3%, efficiency will drop. Boundary layer the fan surge occurs. MVR steam centrifugal fan runs under variable flow conditions, the separation under low flow conditions is the fundamental reason that
出处
《节能技术》
CAS
2015年第1期62-65,共4页
Energy Conservation Technology
基金
江苏省科技厅计划项目(BY2012102)
江苏省环保厅计划项目(2012003)
关键词
机械蒸汽再压缩
离心风机
数值模拟
效率
变工况
mechanical vapor recompression
centrifugal fan
numerical simulation
efficiency
variableconditions
