【摘要】 为研究某330MW直接空冷机组排汽管道内水蒸汽的流动特性和壁面的结构强度,利用FLUENT对该排汽管道内部流场进行了数值模拟,分析其流场特性以探寻排汽管道内压应力集中的部位,进而采用CAESAR II与ANSYS的流固耦合模块相结合的方法,对这些部位进行数值模拟,求出其所受等效应力,改变水平歧管的弯头非标件宽度(500mm、600mm、700mm、800mm)对其所受等效应力和内部流场进行了数值模拟。结果表明:分流器和水平歧管处压力梯度较大,是排汽管道内压应力集中的主要部位;在设计工况下,二者所受等效应力均在许用应力范围之内,水平歧管弯头非标件的最佳设计宽度为600mm。研究方法和结果可为330 MW直接空冷排汽管道设计提供参考。更多还原

【Abstract】 In order to study the flow characteristics of water vapor and structural strength of the wall of exhausting steam pipe for 330 MW direct air-cooled power plant,using FLUENT,a simulation of the flow field of the exhausting steam pipe was conducted to explore position of the internal pressure stress concentration in the flow field. Then using the method of combination CAESARⅡ and ANSYS fluid solid coupling module,the numerical simulation is carried out on these positions to obtain the equivalent stress. A simulation study was conducted on the equivalent stress and flow field of the horizontal manifold when non-standard parts width are 500mm、600mm、700mm、800mm. The results show that: The level pressure gradient of the shunt and horizontal manifold is higher,the shunt and horizontal manifold are positions of the internal pressure stress concentration in the flow field. Under the design conditions,equivalent stress of the two is in the allowable range and the best design width of non-standard parts of the horizontal manifold is 600 mm. The research methods and results can provide some references for design of exhausting steam pipe for 330 MW direct air-cooled power plant.更多还原