CN109612320B - Turbulent flow element and turbulent flow pipe for reducing turbulence critical Reynolds number - Google Patents

Turbulent flow element and turbulent flow pipe for reducing turbulence critical Reynolds number Download PDF

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CN109612320B
CN109612320B CN201811377491.6A CN201811377491A CN109612320B CN 109612320 B CN109612320 B CN 109612320B CN 201811377491 A CN201811377491 A CN 201811377491A CN 109612320 B CN109612320 B CN 109612320B
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turbulence
reynolds number
ribs
support rod
reducing
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CN109612320A (en
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洪宇翔
杜娟
曹南萍
刘奇
钟翔
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Jiangxi Industrial Ceramics Engineering Technology Research Center
Lishui University
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Jiangxi Industrial Ceramics Engineering Technology Research Center
Lishui University
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/24Arrangements for promoting turbulent flow of heat-exchange media, e.g. by plates

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  • Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
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  • General Engineering & Computer Science (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The application discloses a turbulence element and a turbulence tube for reducing turbulence Reynolds number, wherein the turbulence element comprises at least two support rods and a plurality of rib plates which are arranged in parallel; the rib plates are fixed between two adjacent support rods and keep a certain angle with the support rods, and each rib plate is arranged in a scattered manner along the length direction of the support rods; the supporting rod rotates into a multicycle spiral shape according to a certain spiral rate Y, and the rib plates fixed on the supporting rod rotate into an arc shape along with the supporting rod. The application generates high-strength longitudinal vortex in the fluid by the induction of the inclined rib plates, and improves the mixing degree of a near wall area and a core flow area in the tube because the rotation direction of the vortex is parallel to the tube axis, damages the development of a boundary layer, improves the heat flow density of the tube wall, and is further beneficial to improving the heat transfer rate. The application can reduce the critical turbulence Reynolds number of the fluid in the pipe by enhancing the heat transfer of the fluid, thereby obviously improving the comprehensive heat transfer performance of the fluid in the pipe at low Reynolds number.

Description

用于降低湍流临界雷诺数的扰流元件及扰流管Spoiler element and spoiler tube for reducing turbulent critical Reynolds number

技术领域technical field

本发明涉及换热器强化传热技术领域,尤其涉及一种用于降低湍流临界雷诺数的扰流元件及扰流管。The invention relates to the technical field of enhanced heat transfer of heat exchangers, in particular to a spoiler element and a spoiler tube for reducing the critical Reynolds number of turbulent flow.

背景技术Background technique

层流作为一种换热器中常见的流动工况,雷诺数较低,流体质点之间互不碰撞及互不混合,沿着管轴做有规则的平行流动。特别是高粘度流体,在许多工况下,都处于层流。光滑管作为一种常见的换热器用管型,应用层流传热时,对流体的扰动较小,传热速率较低;湍流相对层流的动量及热量交换更为强烈,因此,为了让提高传热效率,常规的做法是将层流转化为湍流。但要达到湍流,雷诺数需要达到4000以上,付出的功耗较大。As a common flow condition in heat exchangers, laminar flow has a low Reynolds number, the fluid particles do not collide with each other and do not mix with each other, and there is a regular parallel flow along the tube axis. Especially high viscosity fluids, in many working conditions, are in laminar flow. As a common tube type for heat exchangers, smooth tubes have less disturbance to the fluid and a lower heat transfer rate when laminar heat transfer is applied; turbulent flow has stronger momentum and heat exchange than laminar flow. Therefore, in order to improve Heat transfer efficiency, conventional practice is to convert laminar flow into turbulent flow. But to achieve turbulent flow, the Reynolds number needs to reach more than 4000, and the power consumption is relatively large.

针对管内低雷诺数工况,工业上常常采用置换装置或扭带等强化元件来降低管内湍流临界雷诺数,促使管内流动状态提前达到湍流,提高管内混合能力及传热速率。但是,很多情况下,管内流场混合均匀度不够,涡流强度较低,摩擦阻力或形体阻力较大,管内传热速率提升幅度有限,等功耗下,综合传热性能不佳。In view of the low Reynolds number conditions in the tube, strengthening elements such as displacement devices or twisted bands are often used in the industry to reduce the critical Reynolds number of turbulent flow in the tube, promote the flow state in the tube to reach turbulent flow in advance, and improve the mixing capacity and heat transfer rate in the tube. However, in many cases, the mixing uniformity of the flow field in the tube is not enough, the eddy current intensity is low, the frictional resistance or shape resistance is large, the increase of the heat transfer rate in the tube is limited, and the overall heat transfer performance is not good under constant power consumption.

发明内容Contents of the invention

为了解决上述技术问题,本发明提供了一种用于降低湍流雷诺数的扰流元件及扰流管,该强化元件通过倾斜肋板的诱导,在流体内产生高强度的纵向涡流,由于涡流旋转方向平行于管轴,提高了管内近壁区与核心流动区的混合程度,破坏了边界层的发展,提高了管壁的热流密度,进而有利于提升传热速率。本发明通过对流体的强化传热,可以降低管内流体的临界湍流雷诺数,进而显著提高管内流体在低雷诺数时的综合传热性能。In order to solve the above-mentioned technical problems, the present invention provides a spoiler element and a spoiler tube for reducing the Reynolds number of turbulent flow. The strengthening element generates a high-intensity longitudinal vortex in the fluid through the induction of the inclined rib. The direction is parallel to the tube axis, which improves the mixing degree of the near-wall area and the core flow area in the tube, destroys the development of the boundary layer, increases the heat flux density of the tube wall, and is conducive to improving the heat transfer rate. The invention can reduce the critical turbulent Reynolds number of the fluid in the tube by enhancing the heat transfer of the fluid, and further significantly improve the comprehensive heat transfer performance of the fluid in the tube at a low Reynolds number.

为了实现上述目的,本发明的一个方面,提供一种螺旋肋板强化传热元件,In order to achieve the above purpose, one aspect of the present invention provides a spiral fin reinforced heat transfer element,

一种用于降低湍流临界雷诺数的扰流元件,A spoiler element for reducing the critical Reynolds number of turbulent flows,

包括至少两条平行设置的支撑杆及多块肋板;Including at least two supporting rods arranged in parallel and multiple ribs;

所述肋板固定于两个相邻的支撑杆之间,且与所述支撑杆保持一定的角度,各个肋板沿支撑杆的长度方向分散设置;The ribs are fixed between two adjacent support rods, and maintain a certain angle with the support rods, and each rib is scattered along the length direction of the support rods;

所述支撑杆按照一定的螺旋率Y旋转成多周期的螺旋状,固定于所述支撑杆上的肋板随之旋转成弧形状。The support rod rotates according to a certain helical rate Y into a multi-period helical shape, and the ribs fixed on the support rod then rotate into an arc shape.

作为优选,所述支撑杆为两条,所述肋板的两端分别固定于两个支撑杆上。Preferably, there are two support rods, and the two ends of the ribs are respectively fixed on the two support rods.

作为优选,所述肋板上设置有若干个用于降低肋板背风面回流漩涡的通孔。Preferably, the ribs are provided with several through holes for reducing the backflow vortex on the leeward side of the ribs.

作为优选,所述通孔为圆孔。Preferably, the through hole is a circular hole.

作为优选,在支撑杆旋转成螺旋状之前,各相邻肋板在支撑杆上平行分布。Preferably, before the support rod rotates into a helical shape, each adjacent rib plate is distributed in parallel on the support rod.

作为优选,在支撑杆旋转成螺旋状之前,相邻肋板之间的交错角为15°~75°。Preferably, before the support rod rotates into a helical shape, the staggered angle between adjacent ribs is 15°-75°.

作为优选,在支撑杆旋转成螺旋状之前,各相邻肋板在支撑杆上成左右对称分布。Preferably, before the support rod rotates into a helical shape, each adjacent rib is symmetrically distributed on the support rod.

作为优选,所述螺旋率Y=2~8。Preferably, the helix rate Y=2-8.

作为优选,所述支撑杆与所述肋板之间的夹角为15°~75°。Preferably, the included angle between the support rod and the rib is 15°-75°.

本发明的另一个方面,提供一种扰流管,该扰流管包括管体及如上所述的扰流元件,所述扰流元件沿管体纵向内置于所述管体内,所述扰流元件通过其多周期的螺旋状结构及固定于螺旋状结构之间的弧形肋板,引导管体内的流体产生多个纵向涡的沿程接力。Another aspect of the present invention provides a turbulence tube, which includes a tube body and the above-mentioned turbulence element, the turbulence element is built in the tube body along the longitudinal direction of the tube body, and the turbulence element Through its multi-period helical structure and the arc-shaped ribs fixed between the helical structures, the element guides the fluid in the pipe body to generate multiple longitudinal vortices along the way.

与现有技术相比,本发明的有益效果为:Compared with prior art, the beneficial effect of the present invention is:

1)本发明提供了一种带弧形肋板的螺旋结构的扰流元件,通过该扰流元件引导流体沿其流动方向产生多个纵向涡的沿程接力,可有效均化流场,提高进壁面的温度梯度,进而提高传热效率。本发明通过引导流体在扰流管内产生纵向涡的大尺度混合,相对横向涡扰流管混合能力更强,传热效率更高。1) The present invention provides a spoiler element with a helical structure with arc-shaped ribs. Through the spoiler element, the fluid is guided along its flow direction to generate a plurality of longitudinal vortices along the route, which can effectively homogenize the flow field and improve the flow rate. The temperature gradient into the wall surface improves the heat transfer efficiency. In the invention, the large-scale mixing of the longitudinal vortex is generated by guiding the fluid in the turbulence tube, and the mixing ability is stronger than that of the transverse vortex turbulence tube, and the heat transfer efficiency is higher.

2)相对典型的扭带,由于纵向涡的沿程接力及螺旋肋板的开孔,部分流体通过圆孔与倾斜肋板后面的流体汇合,可以显著降低倾斜肋板背风面的回流漩涡,进而减小形体阻力,综合传热性能更好。2) Compared with the typical torsion belt, due to the relay along the longitudinal vortex and the opening of the spiral rib, part of the fluid passes through the round hole and merges with the fluid behind the inclined rib, which can significantly reduce the backflow vortex on the leeward side of the inclined rib, and further The body resistance is reduced, and the comprehensive heat transfer performance is better.

3)该强化元件加工方便,安装容易,可以用于新型换热器的设计及旧型换热器的升级,同时由于其引导流体产生涡流,可明显减少高粘度流体的管内结垢。3) The reinforcing element is easy to process and easy to install, and can be used in the design of new heat exchangers and the upgrade of old heat exchangers. At the same time, because it guides the fluid to generate eddy currents, it can significantly reduce the fouling of high-viscosity fluids in the tube.

附图说明Description of drawings

构成本申请的一部分的说明书附图用来提供对本申请的进一步理解,本申请的示意性实施例及其说明用于解释本申请,并不构成对本申请的限定。The accompanying drawings constituting a part of the present application are used to provide further understanding of the present application, and the schematic embodiments and descriptions of the present application are used to explain the present application and not to limit the present application.

图1是本发明实施例1肋板前视图;Fig. 1 is the front view of the rib plate of Embodiment 1 of the present invention;

图2是本发明实施例1在旋转成螺旋状结构之前的侧视图;Fig. 2 is a side view of Embodiment 1 of the present invention before rotating into a helical structure;

图3是本发明实施例1在旋转成螺旋状结构之前的俯视图;Fig. 3 is a top view of Embodiment 1 of the present invention before being rotated into a helical structure;

图4是本发明实施例1在旋转成螺旋状结构之后的立体结构示意图;Fig. 4 is a schematic diagram of the three-dimensional structure of Embodiment 1 of the present invention after being rotated into a helical structure;

图5是本发明实施例1在旋转成螺旋状结构之后的前视图;Fig. 5 is a front view of Embodiment 1 of the present invention after being rotated into a helical structure;

图6是本发明实施例1在旋转成螺旋状结构之后的俯视图;Fig. 6 is a top view of Embodiment 1 of the present invention after being rotated into a helical structure;

图7是本发明实施例2在旋转成螺旋状结构之前的侧视图;Fig. 7 is a side view of Embodiment 2 of the present invention before rotating into a helical structure;

图8是本发明实施例2在旋转成螺旋状结构之前的俯视图;Fig. 8 is a top view of Embodiment 2 of the present invention before rotating into a helical structure;

图9是本发明实施例2在旋转成螺旋状结构之后的立体结构示意图;Fig. 9 is a schematic diagram of the three-dimensional structure of Embodiment 2 of the present invention after being rotated into a helical structure;

图10是本发明实施例3在旋转成螺旋状结构之前的侧视图;Fig. 10 is a side view of Embodiment 3 of the present invention before rotating into a helical structure;

图11是本发明实施例3在旋转成螺旋状结构之前的俯视图;Fig. 11 is a top view of Embodiment 3 of the present invention before rotating into a helical structure;

图12是本发明实施例3在旋转成螺旋状结构之后的立体结构示意图。Fig. 12 is a schematic perspective view of the third embodiment of the present invention after being rotated into a helical structure.

具体实施方式Detailed ways

下面结合附图与实施例对本发明作进一步说明。The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

应该指出,以下详细说明都是例示性的,旨在对本申请提供进一步的说明。除非另有指明,本文使用的所有技术和科学术语具有与本申请所属技术领域的普通技术人员通常理解的相同含义。It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

需要注意的是,这里所使用的术语仅是为了描述具体实施方式,而非意图限制根据本申请的示例性实施方式。如在这里所使用的,除非上下文另外明确指出,否则单数形式也意图包括复数形式,此外,还应当理解的是,当在本说明书中使用术语“包含”和/或“包括”时,其指明存在特征、步骤、操作、器件、组件和/或它们的组合。It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

背景技术中提到,针对换热管内低雷诺数的工况,工业上常常采用置换装置或扭带等强化元件来降低管内湍流临界雷诺数,促使管内流动状态提前达到湍流,提高管内混合能力及传热速率。但是,很多情况下,管内流场混合均匀度不够,涡流强度较低,摩擦阻力或形体阻力较大,管内传热速率提升幅度有限,等功耗下,综合传热性能不佳。基于此,对本发明的具体实施方案做详细描述:As mentioned in the background technology, in view of the low Reynolds number working conditions in the heat exchange tube, strengthening elements such as displacement devices or twisted bands are often used in the industry to reduce the critical Reynolds number of turbulent flow in the tube, promote the flow state in the tube to reach turbulent flow in advance, and improve the mixing capacity and heat transfer rate. However, in many cases, the mixing uniformity of the flow field in the tube is not enough, the eddy current intensity is low, the frictional resistance or shape resistance is large, the increase of the heat transfer rate in the tube is limited, and the overall heat transfer performance is not good under constant power consumption. Based on this, specific embodiments of the present invention are described in detail:

一种用于降低湍流临界雷诺数的扰流元件,包括若干肋板,以及用来固定肋板的两条相互平行的支撑杆,其中,如图1所示,肋板的两端分别固定于两个支撑杆上,且肋板上开有圆孔,肋板沿支撑杆的长度方向(即流体流动方向)分散布置,一般情况下,肋板可以平行布局(如图2),也可以交叉布局(如图5)。肋板的高度H的取值范围为:H=3~20mm,肋板的长度L的取值范围为:L=10~40mm,相应的,圆孔直径D的取值范围为:D=2~15mm,肋板的纵向与支撑杆的纵向之间的倾角a=15°~75°,相邻两个肋板之间的距离P的取值范围为:P=10~40mm。此外,支撑杆的直径d的取值范围为:d=2~5mm,相邻肋板之间的交叉角为15°~75°。肋板与支撑杆整体固定成型后,按照螺旋率Y进行旋转,即得螺旋状的扰流元件,这里需要说明,螺旋率Y的取值范围为:Y=2~8,螺旋率的定义为:支撑杆螺旋360°后的长度S与螺旋杆的宽度B(如图5及图6所示)之比。A turbulence element for reducing the critical Reynolds number of turbulence, including several ribs, and two parallel support rods used to fix the ribs, wherein, as shown in Figure 1, the two ends of the ribs are respectively fixed on There are round holes on the two support rods, and the ribs are scattered along the length direction of the support rods (that is, the direction of fluid flow). Generally, the ribs can be arranged in parallel (as shown in Figure 2) or crossed Layout (as shown in Figure 5). The value range of the height H of the rib is: H=3~20mm, the value range of the length L of the rib is: L=10~40mm, correspondingly, the value range of the diameter D of the round hole is: D=2 ~15mm, the inclination angle a between the longitudinal direction of the ribs and the longitudinal direction of the support bar is 15°~75°, and the range of the distance P between two adjacent ribs is: P=10~40mm. In addition, the value range of the diameter d of the support rod is: d=2-5mm, and the intersection angle between adjacent ribs is 15°-75°. After the rib plate and the support rod are integrally fixed and formed, they are rotated according to the helix rate Y to obtain the helical spoiler. Here, it needs to be explained that the value range of the helix rate Y is: Y=2~8, and the helix rate is defined as : the ratio of the length S of the support rod after helical 360° to the width B of the helical rod (as shown in Figure 5 and Figure 6).

下面结合上述实施方案的结构,列举3组螺旋肋板的结构参数组合方案,用于对本发明进一步进行描述,其中每个实施方案均需结合上述结构,并且本发明的实施方式不限于此,凡是对本发明实质做简单的修改或改变,都属于本发明技术方案的范围。另外,为了评价各个实施例的性能,定义综合传热性能为:In the following, in combination with the structure of the above-mentioned embodiment, the structural parameter combination schemes of three groups of spiral ribs are listed for further description of the present invention, wherein each embodiment needs to be combined with the above-mentioned structure, and the embodiment of the present invention is not limited thereto. Simple modifications or changes to the essence of the present invention all belong to the scope of the technical solution of the present invention. In addition, in order to evaluate the performance of each embodiment, the comprehensive heat transfer performance is defined as:

PEC=(Nu/Nu0)/(f/f0)(1/3)PEC = (Nu/Nu 0 )/(f/f 0 ) (1/3) ;

其中,PEC代表综合传热性能即性能评价标准(performance evaluationcriterion,PEC),Nu0和Nu分别代表光管和强化管的无量纲传热速率(即努赛尔数),f0和f分别代表光管和强化管的无量纲压降即摩擦因子,同功耗下,若PEC大于1,则说明综合传热性能相对光管得到提高,反之则没有提高。Among them, PEC represents the comprehensive heat transfer performance, that is, the performance evaluation criterion (PEC), Nu 0 and Nu represent the dimensionless heat transfer rate (ie Nusselt number) of the light pipe and the enhanced pipe respectively, f 0 and f represent The dimensionless pressure drop of the light pipe and the reinforced pipe is the friction factor. Under the same power consumption, if the PEC is greater than 1, it means that the overall heat transfer performance is improved compared with the light pipe, and vice versa.

实施例1Example 1

如附图1及图2所示,肋板的高度H=4mm,长度L=19mm,板厚t=4mm,各个肋板在支撑杆上平行设置,肋板上分散的开有3个圆孔,圆孔直径D=2mm,圆孔之间距离A1=3.5mm,支撑杆与圆孔之间距离A2=3mm,倾角a=60°,节距P=20mm,支撑杆直径为d=2mm,螺旋肋板的扭率Y=4。As shown in Figure 1 and Figure 2, the height of the ribs is H=4mm, the length L=19mm, and the thickness of the ribs is t=4mm. Each rib is arranged in parallel on the support rod, and there are 3 round holes scattered on the rib. , the diameter of the round hole D=2mm, the distance between the round holes A1=3.5mm, the distance between the support rod and the round hole A2=3mm, the inclination a=60°, the pitch P=20mm, the diameter of the support rod is d=2mm, The twist rate Y=4 of the spiral rib.

其应用方法为:Its application method is:

将肋板固定于支撑杆上,按照螺旋率Y对固定有肋板的支撑杆进行螺旋,从而形成多周期螺旋的扰流元件(如图3、图4、图5及图6)。将该扰流元件内置于扰流管中,采用点焊的方法进行固定,方便拆装。使用中,流体从扰流管的一端进入,在扰流元件的诱导下,产生沿流体流动方向的纵向涡,涡流冲刷管壁,带动高温流体与低温流体的混合,减小了管内速度矢量与温度梯度矢量之间的夹角,体积加权平均协同角低于光管中两者接近90°的夹角,提高了温度场与速度场的协同,相对光管,管内流体置换强度大大提高,减薄了边界层。由于扰流元件螺旋结构的周期性,纵向涡流反复形成,不易衰减,以较低的阻力在每个节距中间形成协同接力,从而获得较佳的传热速率。在常见工况下,与传统的光滑管相比,临界雷诺数低于1000,传热速率提高100%以上,同功耗下,综合传热性能PEC可达到2以上。The rib plate is fixed on the support rod, and the support rod fixed with the rib plate is spiraled according to the spiral rate Y, thereby forming a multi-cycle spiral spoiler element (as shown in Fig. 3, Fig. 4, Fig. 5 and Fig. 6). The spoiler element is built into the spoiler tube and fixed by spot welding for easy disassembly and assembly. In use, the fluid enters from one end of the spoiler tube, and under the induction of the spoiler element, a longitudinal vortex along the fluid flow direction is generated, and the vortex scours the tube wall, driving the mixing of high-temperature fluid and low-temperature fluid, reducing the velocity vector and the low-temperature fluid in the tube. The included angle between the temperature gradient vectors, the volume-weighted average synergy angle is lower than the angle between the two in the light pipe, which is close to 90°, which improves the coordination of the temperature field and the velocity field. Compared with the light pipe, the fluid replacement intensity in the pipe is greatly improved, reducing thinning the boundary layer. Due to the periodicity of the helical structure of the spoiler element, the longitudinal vortex is formed repeatedly, which is not easy to attenuate, and a cooperative relay is formed in the middle of each pitch with low resistance, so as to obtain a better heat transfer rate. Under common working conditions, compared with traditional smooth tubes, the critical Reynolds number is lower than 1000, and the heat transfer rate is increased by more than 100%. Under the same power consumption, the comprehensive heat transfer performance PEC can reach more than 2.

实施例2Example 2

如图7及图8所示,本实施例与实施例1不同的地方在于肋板在支撑杆上的布局存在差异,沿流动方向两相邻肋板的交叉角为60°,且两者反向排列,成左右对称,支撑杆带动肋板螺旋完毕后,其结构图如图9所示,其它结构同实施例1,应用方法亦同实施例1。As shown in Figure 7 and Figure 8, the difference between this embodiment and Embodiment 1 is that there are differences in the layout of the ribs on the support rods, the intersection angle of two adjacent ribs along the flow direction is 60°, and the two are opposite To arrange, become left-right symmetry, after support rod drives rib plate to spiral, its structural diagram is as shown in Figure 9, and other structures are the same as embodiment 1, and application method is also the same as embodiment 1.

实施例3Example 3

如附图10、图11及图12所示,肋板的板高H=6mm,长度L=25mm,板厚t=6mm,相邻肋板之间相互平行,且肋板上开有3个圆孔,圆孔的直径D=3mm,相邻圆孔之间距离A1=3.5mm,支撑杆与圆孔之间距离A2=3mm,倾角a=45°,节距P=20mm,支撑杆直径为d=2mm,螺旋肋板的扭率Y=4。在常见工况下,与传统的光滑管相比,临界雷诺数低于1000,传热速率提高150%以上,同功耗下,综合传热性能达到2.5以上,其应用方法同实施例1。As shown in Figure 10, Figure 11 and Figure 12, the height of the ribs is H=6mm, the length L=25mm, the thickness of the ribs is t=6mm, the adjacent ribs are parallel to each other, and there are 3 ribs Round hole, the diameter of the round hole D=3mm, the distance between adjacent round holes A1=3.5mm, the distance between the support rod and the round hole A2=3mm, the inclination angle a=45°, the pitch P=20mm, the diameter of the support rod For d=2mm, the torsion rate Y=4 of the spiral rib. Under normal working conditions, compared with the traditional smooth tube, the critical Reynolds number is lower than 1000, and the heat transfer rate is increased by more than 150%. Under the same power consumption, the comprehensive heat transfer performance reaches more than 2.5, and its application method is the same as that of Example 1.

本发明提供的扰流元件利用被螺旋为弧形的肋板与流体流动方向的倾角,在流场诱导产生纵向涡,再将肋板在支撑杆的固定下按照一定螺旋率螺旋,在倾角与螺旋的双重作用下,进一步提高纵向涡的强度和影响区域,在主流核心区与壁面区大幅度提高流体置换能力,加强流体质点碰撞,提高了流场与温度场的均匀程度,提升了管壁热通量。当然,该扰流元件不但适用于圆形通道,也适用于矩形通道。由于可以将湍流临界雷诺数降低,在较小的流速下,就可以获得较高的湍流度,因此该扰流元件不但适用于高粘度流体的低雷诺数流动,也适用于低粘度流体的低雷诺数流动。通过在流动方向布置若干个肋板及在肋板上开孔,主动调控阻力,从而在低雷诺数下,既保证大的传热速率,又能付出较小的流体功耗,从而在总体上可以获得低阻高效的强化综合传热性能。The turbulence element provided by the present invention utilizes the inclination angle between the rib plate spiraled into an arc and the fluid flow direction to induce longitudinal vortices in the flow field, and then the rib plate is screwed according to a certain helical rate under the fixation of the support rod. Under the double function of the spiral, the strength and influence area of the longitudinal vortex are further improved, the fluid replacement capacity is greatly improved in the core area of the mainstream and the wall area, the collision of fluid particles is strengthened, the uniformity of the flow field and temperature field is improved, and the pipe wall is improved. Heat flux. Of course, the turbulence element is not only suitable for circular channels, but also for rectangular channels. Since the critical Reynolds number of turbulent flow can be reduced, a higher degree of turbulence can be obtained at a lower flow rate, so the turbulence element is not only suitable for low Reynolds number flow of high-viscosity fluid, but also suitable for low-viscosity fluid flow. Reynolds number flow. By arranging several ribs in the flow direction and opening holes in the ribs, the resistance is actively regulated, so that at a low Reynolds number, it can not only ensure a large heat transfer rate, but also pay a small fluid power consumption, so that the overall Low-resistance and high-efficiency enhanced comprehensive heat transfer performance can be obtained.

上述仅为本发明的一个实施例而已,本领域内的技术人员应明白,本发明的实施例可提供为方法、系统或计算机程序产品。因此,本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。The above is only one embodiment of the present invention, and those skilled in the art should understand that the embodiments of the present invention may be provided as methods, systems or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects.

此外,需要说明的是:In addition, it should be noted that:

说明书中提到的“一个实施例”或“实施例”意指结合实施例描述的特定特征、结构或特性包括在本发明的至少一个实施例中。因此,说明书通篇各个地方出现的短语“一个实施例”或“实施例”并不一定均指同一个实施例。Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, appearances of the phrases "one embodiment" or "an embodiment" in various places throughout this specification do not necessarily all refer to the same embodiment.

尽管已描述了本发明的优选实施例,但本领域内的技术人员一旦得知了基本创造性概念,则可对这些实施例做出另外的变更和修改。所以,所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。While preferred embodiments of the present invention have been described, additional changes and modifications can be made to these embodiments by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.

上述虽然结合附图对本发明的具体实施方式进行了描述,但并非对本发明保护范围的限制,所属领域技术人员应该明白,在本发明的技术方案的基础上,本领域技术人员不需要付出创造性劳动即可做出的各种修改或变形仍在本发明的保护范围以内。Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, those skilled in the art do not need to pay creative work Various modifications or variations that can be made are still within the protection scope of the present invention.

Claims (8)

1.一种用于降低湍流临界雷诺数的扰流元件,其特征在于,1. A spoiler element for reducing the critical Reynolds number of turbulence, characterized in that, 包括至少两条平行设置的支撑杆及多块肋板;Including at least two supporting rods arranged in parallel and multiple ribs; 所述肋板固定于两个相邻的支撑杆之间,且与所述支撑杆保持一定的角度,各个肋板沿支撑杆的长度方向分散设置;The ribs are fixed between two adjacent support rods, and maintain a certain angle with the support rods, and each rib is scattered along the length direction of the support rods; 所述支撑杆按照一定的螺旋率Y旋转成多周期的螺旋状,固定于所述支撑杆上的肋板随之旋转成弧形状;The support rod rotates into a multi-period spiral shape according to a certain spiral rate Y, and the rib plate fixed on the support rod then rotates into an arc shape; 所述支撑杆为两条,所述肋板的两端分别固定于两个支撑杆上;There are two support rods, and the two ends of the ribs are respectively fixed on the two support rods; 所述肋板上设置有若干个用于降低肋板背风面回流漩涡的通孔。The ribs are provided with several through holes for reducing the backflow vortex on the leeward side of the ribs. 2.根据权利要求1所述的一种用于降低湍流临界雷诺数的扰流元件,其特征在于,所述通孔为圆孔。2 . The turbulence element for reducing the critical Reynolds number of turbulent flow according to claim 1 , wherein the through hole is a round hole. 3 . 3.根据权利要求1所述的一种用于降低湍流临界雷诺数的扰流元件,其特征在于,在支撑杆旋转成螺旋状之前,各相邻肋板在支撑杆上平行分布。3 . The turbulence element for reducing the critical Reynolds number of turbulence according to claim 1 , characterized in that, before the support rod rotates into a spiral shape, each adjacent rib is distributed in parallel on the support rod. 4 . 4.根据权利要求3所述的一种用于降低湍流临界雷诺数的扰流元件,其特征在于,在支撑杆旋转成螺旋状之后,相邻肋板之间的交错角为15°~75°。4. A turbulence element for reducing the critical Reynolds number of turbulent flow according to claim 3, characterized in that, after the support rod is rotated into a spiral shape, the staggered angle between adjacent ribs is 15°-75° °. 5.根据权利要求1所述的一种用于降低湍流临界雷诺数的扰流元件,其特征在于,在支撑杆旋转成螺旋状之前,各相邻肋板在支撑杆上成左右对称分布。5 . The turbulence element for reducing the critical Reynolds number of turbulent flow according to claim 1 , wherein, before the support rod rotates into a spiral shape, each adjacent rib is symmetrically distributed on the support rod. 6 . 6.根据权利要求1所述的一种用于降低湍流临界雷诺数的扰流元件,其特征在于,所述螺旋率Y=2~8。6 . The flow turbulence element for reducing the critical Reynolds number of turbulent flow according to claim 1 , wherein the spiral rate Y=2-8. 7 . 7.根据权利要求1所述的一种用于降低湍流临界雷诺数的扰流元件,其特征在于,所述支撑杆与所述肋板之间的夹角为15°~75°。7 . The spoiler element for reducing the critical Reynolds number of turbulent flow according to claim 1 , wherein the angle between the support rod and the rib plate is 15°-75°. 8.一种扰流管,其特征在于,包括管体及如权利要求1-7中任一项所述的扰流元件,所述扰流元件沿管体纵向内置于所述管体内,所述扰流元件通过其多周期的螺旋状结构及固定于螺旋状结构之间的弧形肋板,引导管体内的流体产生多个纵向涡的沿程接力。8. A turbulence tube, characterized in that it comprises a tube body and the turbulence element according to any one of claims 1-7, the turbulence element is built into the tube body along the longitudinal direction of the tube body, so The flow turbulence element guides the fluid in the pipe body to generate multiple longitudinal vortices through its multi-period helical structure and the arc-shaped ribs fixed between the helical structures.
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