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排汽缸结构复杂,导致流场混乱,容易形成不同程度的漩涡,造成能量损失。为此,运用流体计算软件Fluent对排汽缸进行数值模拟,研究了其内部流场特点,分析了扩压管出口宽度和内壁倾角对扩压管出口处流场的影响。流体从扩压管流出后,向上翻转进入上半缸,在上半缸形成了另一个漩涡。针对排汽缸内不同形式的漩涡,对扩压管出口结构进行优化改造和在拱顶处加装导流挡板,存在一个最优的扩压管出口宽度和内壁倾斜角度,使得扩压管出口附近漩涡最小;导流板的数量和安装位置对漩涡有不同程度的影响,通过模拟得出了最佳的挡板组合,能最大程度削弱排汽缸内的漩涡,改善其性能。
Exhaust cylinder structure is complex, leading to confusion in the flow field, easy to form varying degrees of vortex, resulting in energy loss. Therefore, the numerical simulation of the discharge cylinder is carried out by using the fluid calculation software Fluent. The internal flow field is studied. The influence of the outlet width of the diffuser pipe and the inclination of the inner wall on the flow field at the outlet of the diffuser pipe is analyzed. Fluid from the diffuser outflow, flip up into the upper half cylinder, forming another vortex in the upper half cylinder. For the exhaust vortex in different forms of vortex, the outlet structure of the diffuser optimization and installation of diversion at the vault at the baffle, there is an optimal outlet duct wall width and inclination of the wall, making the diffuser outlet The number of vortex shedding and installation location have different degrees of influence on the vortex. The best combination of baffle is obtained through simulation, which can greatly reduce vortices in the exhaust cylinder and improve its performance.