CAJ | 학술논문

文章采用商用计算流体动力学软件CFX,对不同导流环结构汽轮机的高压排汽缸进行了全三维粘性定常流动数值模拟,结果表明,扩压器过渡段相对轴向长度、导流环相对高度以及导流段处导流环半径对高压排汽缸气动性能均有重要影响。随扩压器过渡段相对轴向长度以及导流段导流环半径的增加,排汽缸总压损失系数逐渐降低；导流环的相对高度以及扩压段处导流环的半径则存在有最佳值,使得排汽缸总压损失系数最小。
문장채용상용계산류체동역학연건CFX,대불동도류배결구기륜궤적고압배기항진행료전삼유점성정상류동수치모의,결과표명,확압기과도단상대축향장도、도류배상대고도이급도류단처도류배반경대고압배기항기동성능균유중요영향。수확압기과도단상대축향장도이급도류단도류배반경적증가,배기항총압손실계수축점강저；도류배적상대고도이급확압단처도류배적반경칙존재유최가치,사득배기항총압손실계수최소。
A numerical simulation on full 3D steady viscous flow fields in the HP exhaust hood of steam turbines is conducted by using the commercial computational flow dynamics software CFX. The result shows that the relative axial length of transition section in diffuser, relative height of the guiding annulus and radius of the guiding annulus of diversion section have great effects on aero-dynamic performance of the HP exhaust hood. The total pressure loss coefficient of the exhaust hood decreases gradually when the relative axial length of transition section in diffuser and radius of the diversion section of guiding annulus increase. To improve the total pressure loss coefficient of the exhaust, the relative height of the guiding annulus and radius of the guiding annulus of diffuser area exists an optimum.