为了提高热力发电系统的热效率提高能源利用率,提出了一种新型解耦式扭转异型涡发生器,在保持中心部件不动的同时,分别控制每个叶片的扭转角度,使涡发生器的布置更加灵活以适应不同的流动条件。旨在通过改善管内流体的流动特性,增强传热效果。在雷诺数为6000-20000的范围内研究了新型涡发生器叶片形状,叶片攻角β,叶片前后沿比值H/H1,布置间距P对流动传热特性的影响,对比了结构参数对Nu,摩擦因子f,综合换热性能PEC以及协同角θ的作用。结果表明:涡发生器强化了管道核心流动和边壁流动,增强了整个管道的换热效果,比光滑圆管Nu提高了45.74％~46.49％。梯形叶片涡发生器的PEC最好,比矩形增大4.19％~9.62％,比三角形增大1.41％~2.57％。β和H/H1的增大均会使Nu和f增大,场协同角变小,在β=90°时,平均协同角θm最小可达84.22°,PEC最优为1.17~1.30。在H/H1=0.61、P=85 mm时,PEC最优可达1.21~1.31。在模拟数据的基础上,利用β、H/H1、P构建了Nu和f的相关性表达式,模型预测与实际数据吻合度较高。

In order to strengthen the heat transfer in the tube, this paper proposes a new decoupled torsional profiled vortex generator, and the effects of the new vortex generator blade shape, blade angle of attack β, the ratio of the blade front and back edges H/H1, and the arrangement spacing P on the flow heat transfer characteristics are investigated in the range of Re 6000-20000, and the effects of the structural parameters on the Nu, the friction factor f, the comprehensive heat transfer performance PEC, and the synergistic angle θ are compared. The effects of structural parameters on Nu, friction factor f, integrated heat transfer performance PEC and synergistic angle θ were compared. The results show that the vortex generator strengthens the core flow and sidewall flow of the pipe, enhances the heat transfer effect of the whole pipe, and improves the Nu by 45.74%~46.49% compared with that of the smooth circular pipe. The trapezoidal blade vortex generator has the best PEC, which increases 4.19%~9.62% than rectangular and 1.41%~2.57% than triangular. the increase of both β and H/H1 increases Nu and f, and the field synergistic angle θ becomes smaller, and the average synergistic angle θm is minimized up to 84.22° at β=90°, with the optimal PEC of 1.17~1.30. At H/H1=0.61, P=85mm, the PEC is optimal up to 1.21~1.31. On the basis of the simulated data, the correlation expressions of Nu and f are constructed by using β, H/H1, and P, and the model predictions are in good agreement with the actual data.