在加速器驱动系统（ADS）中,真空质子束流管出口端为一半球面质子束窗,用于隔离束流管和散裂靶。质子束窗表面热负荷很高,有效冷却质子束窗,从而提高靶件寿命和系统安全性是靶件设计的关键。 采用PHOENICS 3.2程序对ADS靶件冷态下的流场进行数值模拟。在贴体坐标（BFC）下生成计算网格,对靶件束窗下方有无导流板时的靶区流场进行了计算。当体积流量为10m3/h时,流体向下流动进入中央流道（靶区）之前发生边界层脱离,并在质子束窗下方两侧形成一对对称的旋涡。两旋涡在靶区中央重叠,形成一股向上较强的回流。这股回流沿质子束窗 In the accelerator drive system (ADS), the exit end of the vacuum proton beam tube is a hemispherical proton beam window that isolates the beam tube from the spallation target. Proton beam window surface heat load is high, the effective cooling of the proton beam window, thereby enhancing the target life and system safety is the key to the target design. The PHOENICS 3.2 program is used to simulate the flow field of ADS target in cold state. A computational mesh is generated under BFC and the target flow field is calculated for the presence or absence of the baffle below the target beam window. When the volume flow rate is 10m3 / h, the boundary layer detachment occurs before the fluid flows downward into the central channel (target zone), and a pair of symmetrical vortices are formed on both sides below the proton beam window. The two vortices overlap in the center of the target area, forming an upward strong reflux. This stream flows back along the proton beam window