Abstract: Fluid turbulent flow characteristics in the inner half-coil jacket of an autoclave were studied numerically and experimentally. Good agreement was found between the experimental and numerical results in the inner half coil jacket with curvature ratio d=0.133 and dimensionless pitch t=0.127. Based on orthogonal helical coordinate, the velocity field distributions were displayed including average axial velocity, secondary flow velocity and secondary flow stream function. The effects of Reynolds number Re, curvature ratio d and dimensionless pitch t on velocity fields and flow resistance were studied. The results show that at the fully developed turbulent flow condition, there are two positions of maximum average axial velocity on the semicircular cross section and the secondary flow patterns are stable four-vortex in the inner half-coil jacket. With the increase of Re and d, the intensity of secondary vortex and turbulent flow resistance of the inner half-coil jacket are both enhanced. Compared with the outer half-coil jacket, turbulent flow resistance fRe of the inner one increases 2.13%~7.72% in the range of 0.05≤d≤0.1, 10000≤Re≤18000.

Key words: half-coil jacket, experiment, turbulent flow, secondary flow, flow resistance

摘要： 采用实验和数值模拟方法对安装在反应釜内壁侧的螺旋半圆管夹套中流体的湍流流动特性进行了研究. 无量纲曲率d=0.133、无量纲螺距t=0.127的夹套中流体湍流速度场的实测与模拟结果吻合较好. 基于正交螺旋坐标系，给出了夹套内流体的速度场，包括平均轴向速度、二次流速度及二次流函数分布. 研究了平均雷诺数Re、d及t对速度场及流动阻力的影响. 结果表明，充分发展湍流条件下，釜内螺旋半圆管夹套横截面上，平均轴向速度最大值的位置有2个，二次流为恒定的4涡结构. 随Re和d增加，2对二次涡的强度及湍流流动阻力fRe均增加. 相对于釜外螺旋半圆管夹套，在0.05≤d≤0.1, 10000≤Re≤18000的范围内，釜内螺旋半圆管夹套中的湍流流动阻力fRe提高了2.13%~7.72%.

关键词: 螺旋半圆管夹套, 实验, 湍流, 二次流, 流动阻力