摘要
利用大涡模拟(LES)方法对阀体后90°圆形弯管内部流场进行了三维数值模拟,获得了蝶阀在全开状态下弯管内不同截面的流场特性和不同径向截面的涡旋结构,并与粒子图像测试(PIV)实验结果进行了对比.结果表明:大涡模拟方法能够更细致地模拟弯管内部流体的流场特性,且与实验结果吻合较好;弯管中心以上20mm截面附近受到蝶阀扰流的影响最大,且速度较大区域出现位置相对靠后;各个截面θ=0处均存在涡旋结构,同时弯管外侧形成较明显的涡旋结构,且涡旋结构出现的位置相对稳定.
A 3D numerical simulation was carried out on inner flow in a 90° fore-end valve using large eddy simulation （LES） method, so as to obtain th different sections and the vortex structure in different radial cross sections at f clr e fl cular-sectioned bend with ow field characteristics in open state of the butterfly valve, which were subsequently compared with particle image velocimetry （PIV） method. Results show that the LES method can well simulate the inner flow field in curved bend, and its result fits well with that of actual experiment; the influence of disturbance from butterfly valve on the inner flow field is relatively high in the area 20 mm above the curved bend center section, where the high speed region moves rearward; vortex structure is found in each section at angle θ=0; the vortex structure at outer side of curved bend is more obvious than at the inner side, and its position is relatively fixed.
出处
《动力工程学报》
CAS
CSCD
北大核心
2013年第8期595-599,共5页
Journal of Chinese Society of Power Engineering
基金
上海市科委科技攻关计划资助项目(08DZ1200102)
