CAJ | 학술논문

针对汽轮机排汽通道的复杂三维流动造成凝汽器喉部出口流场的不均匀现象，采用湿蒸汽模型，对排汽通道加装导流装置前后的流场进行三维数值模拟。结果表明：小汽轮机排汽侧的低速区、靠近中心区域的漩涡低速区、壁角处的高速区及蒸汽湿度的变化是影响凝汽器喉部出口截面速度分布不均匀的主要因素。通过数值试验，加装导流装置后，在不同进口湿度工况下，能量损失系数增加了约5％而均匀性系数增加了约12％。所得出的导流装置加装方案能够在引起较小的能量损失情况下，有效改善排汽通道流场的均匀性。
침대기륜궤배기통도적복잡삼유류동조성응기기후부출구류장적불균균현상，채용습증기모형，대배기통도가장도류장치전후적류장진행삼유수치모의。결과표명：소기륜궤배기측적저속구、고근중심구역적선와저속구、벽각처적고속구급증기습도적변화시영향응기기후부출구절면속도분포불균균적주요인소。통과수치시험，가장도류장치후，재불동진구습도공황하，능량손실계수증가료약5％이균균성계수증가료약12％。소득출적도류장치가장방안능구재인기교소적능량손실정황하，유효개선배기통도류장적균균성。
Aimed at the non-uniform phenomenon of the outlet flow field in condenser throat,which caused by complex 3-D flow in steam turbine exhaust passage, the flow field of exhaust passage, before and after the installation of flow guide devices,were 3-D numerically simulated using the wet steam model.The results show that the main factors,affecting the non-uniform velocity distribution of the outlet flow field in condenser throat,include the low velocity range of boiler feed pump turbine side,the low velocity vortex range nearing to center area,the high velocity range of wall corner and the change of wet steam humidity.Through a serial of numerical experiments,at the different humidity of wet steam,the uniformity coefficient and the energy loss coefficient increased by about 5%and 12%,respectively,after the installation of flow guide devices.This installation scheme of flow guide devices can cause the smaller energy loss and improve effectively the flow field uniformity in exhaust passage.