脉动流通道内不同纵向涡发生器的颗粒污垢特性

doi:10.11949/0438-1157.20240285

摘要/Abstract

摘要：

换热器工作时介质中往往含有细小杂质粒子，容易沉积在通道中形成颗粒污垢。将传统脉动流与纵向涡发生器相结合，采用数值模拟方法对光滑通道、脉动流通道、纵向涡发生器通道以及脉动流结合纵向涡发生器通道的颗粒污垢特性进行对比分析，并且详细分析了脉动流结合纵向涡发生器通道中6种不同纵向涡发生器的影响。结果表明，相较于光滑通道，脉动流通道与纵向涡发生器通道的污垢热阻分别减小17%与22%，而脉动流结合纵向涡发生器通道能够减小45%，说明二者结合后的抑垢效果更好。对比脉动流结合6种不同纵向涡发生器发现相同类型下弯曲纵向涡发生器的抑垢效果优于未弯曲纵向涡发生器，通过与脉动流通道的污垢热阻渐近值对比发现抑垢效果由低到高为三角形12.8%、弯曲三角形14.7%、梯形22.0%、弯曲梯形23.8%、矩形29.4%、弯曲矩形33.0%，其中弯曲矩形纵向涡发生器的抑垢效果最好。

关键词: 脉动流, 纵向涡发生器, 粒子, 结垢, 数值模拟, 污垢热阻

Abstract:

When the heat exchanger is working, the medium often contains small impurity particles, which are easily deposited in the channels to form particulate fouling. This paper combines the traditional pulsating flow with the longitudinal vortex generator, and uses numerical simulation to compare and analyze the particulate fouling characteristics of the smooth channel, pulsating flow channel, longitudinal vortex generator channel and pulsating flow combined with longitudinal vortex generator channel, and analyzes the effect of the six different longitudinal vortex generators on the particulate deposition in the pulsating flow combined with longitudinal vortex generator channel in detail. The results show that compare with the fouling resistance of smooth channel, the fouling resistance of the pulsating flow channel and the longitudinal vortex generator channel are reduced by 17% and 22%, respectively, while the combination of the two can be reduced by 45% in the pulsating flow combined with longitudinal vortex generator channel, which indicates that the fouling suppression effect is better after the combination of the two. In addition, comparing the pulsating flow combined with six different longitudinal vortex generators, it is found that the curved longitudinal vortex generator has a better anti-fouling effect than the unbent longitudinal vortex generator of the same type. By comparing with the asymptotic value of the resistance of fouling in the pulsating flow channel, it is found that the anti-fouling effects from low to high are: triangle 12.8%, curved triangle 14.7%, trapezoid 22.0%, curved trapezoid 23.8%, rectangle 29.4%, and curved rectangle 33.0%, among which the curved rectangular longitudinal vortex generator has the best anti-fouling effect.

Key words: pulsating flow, longitudinal vortex generator, particle, fouling, numerical simulation, fouling resistance

中图分类号:

TK 124

韩志敏, 李江, 陈则齐, 刘威, 徐志明. 脉动流通道内不同纵向涡发生器的颗粒污垢特性[J]. 化工学报, 2024, 75(7): 2486-2496.

Zhimin HAN, Jiang LI, Zeqi CHEN, Wei LIU, Zhiming XU. Particulate fouling characteristics of different longitudinal vortex generators in pulsating flow channel[J]. CIESC Journal, 2024, 75(7): 2486-2496.

图/表 10

图1 物理模型

Fig.1 Physical model

表1 物理模型对应几何参数

Table 1 Corresponding geometric parameters of physical model

参数	符号	数值
通道长度/mm	L	1000
通道高度/mm	H	20
通道宽度/mm	W	40
纵向涡发生器横向间距/mm	D	8
纵向涡发生器纵向间距/mm	L₂	180
纵向涡发生器长边高度/mm	a	3
纵向涡发生器短边高度/mm	c	1.5
纵向涡发生器长度/mm	b	6
纵向涡发生器攻角/（°）	θ	90
纵向涡发生器排数/mm	N	5
进口段距离/mm	L₁	140

图2 网格无关性验证

Fig.2 Grid independence verification

图3 实验验证结果

Fig.3 Experimental verification results

图4 4种通道的对比情况

Fig.4 Comparison of four channels

图5 4种通道的云图

Fig.5 Contours of four channels

图6 4种通道的剪切力对比

Fig.6 Comparison of shear force of four channels

图7 6种纵向涡发生器的对比

Fig.7 Comparison of six kinds of longitudinal vortex generators

图8 6种纵向涡发生器的速度云图和纵向涡

Fig.8 Velocity contours and longitudinal vortex of six longitudinal vortex generators

图9 6种纵向涡发生器的剪切力

Fig.9 Shear force of six longitudinal vortex generators

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