The three-dimensional flow structure induced by normal shock wave/turbulent boundary-layer interaction in a constant-area rectangular duct at Ma = l. 68 is numerically investigated by using the Reynolds Stress Model and k-ω SST turbulent model. In comparison with SST model, the RSM model resolves secondary flow effects, and therefore a reduced corner separation zone is acquired. This leads to a better match between the experimental data and the RSM results. Under the effect of the wall friction due to viscosity, the shocks of shock train will bifurcate near both top/bottom walls and side walls, and the three-dimensional "λ" shock waves are formed at the duct corner. In the position close to the wall, the foreleg shock of the first "λ" shock splits and a new smaller "λ" shock wave is observed.%使用RSM湍流模型对来流Ma=l.68矩形等截面管道内的正激波/附面层干扰流动进行了三维数值模拟,将计算结果与实验数据和k=ωSST模型计算结果进行了分析比较.结果表明,由于考虑了流动各向异性,RSM模型计算结果能够捕捉到流场横截面中的二次旋涡流动,相对kω SST模型更为准确地模拟了壁面及角流区附面层流动形态和分离特性,与实验数据吻合的更好.分析激波串第一道“λ”激波在壁面角流区的激波分叉结构发现,激波串在壁面的作用下,在管道内的上下壁和侧壁附近都会发生激波分叉现象形成三维“λ”激波；其中第一道“λ”激波的前腿激波会在近壁处二次发生激波/附面层干扰作用,形成范围较小的新的“λ”分叉激波.
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