CAJ | 학술논문

使用人工压缩法计算了突扩管道流.对计算所得不同雷诺数下的等压线图和流线图进行了对比分析,结果表明,在扩张截面的拐点处形成了低压区,扩张后在侧壁右侧形成了涡,且Re数越小涡越小,Re数越小涡心的位置离侧壁越近.同时在计算中也发现,Re数较大时在出口处将形成回流区,收敛速度也变慢.
사용인공압축법계산료돌확관도류.대계산소득불동뢰낙수하적등압선도화류선도진행료대비분석,결과표명,재확장절면적괴점처형성료저압구,확장후재측벽우측형성료와,차Re수월소와월소,Re수월소와심적위치리측벽월근.동시재계산중야발현,Re수교대시재출구처장형성회류구,수렴속도야변만.
A numerical solution of two-dimensional pipe flow with sudden expansion was conducted by solving the Navier-Stokes equations according to the artificial compressibility method.The pressure contours and streamline pictures of the pipe flow were predicted and compared at the Reynolds numbers,Re,of 20,50,100.Meiobar is formatted at the inflexion of the expanding section.Vortices are generated at the corner.When Re number becomes smaller,the position of vortex core moves closer to wall and the vortices become smaller.The computational results also show that as Re is large enough,there is a reattachment area at the outlet and the convergence speed becomes slow.