论文部分内容阅读
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δ=0.133、无量纲螺距τ=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、δ及τ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δ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≤δ≤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%.
The turbulent flow characteristics of the fluid in the helical semicircular tube jacket installed on the inner wall of the reactor were studied by means of experiment and numerical simulation.The turbulent velocity field of the fluid in the jacket with the dimensionless curvature δ = 0.133 and the dimensionless pitch τ = 0.127 The experimental results agree well with the simulation results.According to the orthogonal spiral coordinate system, the velocity field of the fluid in the jacket is given, including the average axial velocity, the secondary flow velocity and the secondary flow function distribution.The average Reynolds number Re , Δ and τ on the velocity field and flow resistance.The results show that under the condition of fully developed turbulent flow, there are two locations of the maximum average axial velocity on the cross section of the inner wall of the spiral tube in the reactor, and the secondary flow is constant With the increase of Re and δ, the strength and turbulent flow resistance fRe of the two pairs of secondary vortexes increase.Compared with the external semicircular tube jacket of the autoclave, in the range of 0.05≤δ≤0.1, 10000≤Re≤18000 The turbulent flow resistance fRe in the inner and the inner spiral semicircular pipe jackets increased 2.13% ~ 7.72%.