This paper proposes an innovative vortex generator (VG) named as streamlined winglet pair (SWP) VG. It is used in a helical channel with rectangular cross section to enhance heat transfer performance. The effects of the arrangement of the SWP VGs on the performance are investigated by using air as the working fluid. The heat transfer enhancement and pressure drop of the SWP VGs are compared with those of the equilateral triangular winglet pair (ETWP) VGs, the isosceles right-angled triangular winglet pair (IRATWP) VGs, the semicircle winglet pair (SEWP) VGs, and the spline curve winglet pair (SCWP) VGs. The field of vorticity and pressure around the VGs are analyzed. The results of this study show that, compared with those of the heat exchanger without VGs, the heat transfer coefficients increase by 46 % by using the VGs mentioned above. Among all types of VGs used in this study, the SWP VGs exhibits the least pressure drop. Compared with those of the IRATWP VGs, the friction factors of the SWP VGs decrease by 21 %. The main reason for the lower pressure drop exhibited by the SWP VGs is that the pressure drag is lower owing to its streamlined configurations. The arrangements of the SWP VGs significantly affect the thermal performance enhancement.

本文提出了一种创新的涡流发生器（VG），称为流线型小翼对（SWP）VG。它用于具有矩形横截面的螺旋形通道中，以增强传热性能。通过使用空气作为工作流体，研究了SWP VG的布置对性能的影响。将SWP VG的传热增强和压降与等边三角形小翼对（ETWP）VG，等腰直角三角形小翼对（IRATWP）VG，半圆小翼对（SEWP）VG和样条曲线小翼对（SCWP）VG。分析了VG周围的涡流场和压力场。研究结果表明，与不带VG的热交换器相比，使用上述VG的传热系数提高了46％。在本研究中使用的所有类型的VG中，SWP VG的压降最小。与IRATWP VG相比，SWP VG的摩擦系数降低了21％。SWP VG表现出较低的压降的主要原因是，由于其流线型配置，压力阻力较低。SWP VG的布置极大地影响了热性能的提高。