Bionic manta ray turbulence plug-in and enhanced heat exchange tube

Abstract

The invention belongs to the technical field of heat exchange equipment, and particularly discloses a bionic manta ray turbulent flow insert and an enhanced heat exchange tube. The bionic manta ray turbulent flow insert is formed by sequentially arranging a plurality of bionic manta ray turbulent flow units in the axial direction. Each bionic manta ray turbulent flow unit comprises a plurality of bionic manta ray guide blades and saddle-shaped connecting webs, the three-dimensional variable-curvature bionic manta ray guide blades are connected through the saddle-shaped connecting webs with the inner sides being in streamline distortion, and triangular connecting rib plates are formed at the intersections of the saddle-shaped connecting webs. The adjacent bionic manta ray turbulence units are welded and fixed at the tip ends of the guide vanes to form an integral turbulence plug-in, and the plug-in is coaxially mounted in the enhanced heat exchange tube. The bionic manta ray guide blades are used for inducing longitudinal vortexes, heat transfer is remarkably enhanced under low energy consumption, and meanwhile the defect that the inner wall of the pipe body is prone to scaling is effectively overcome.

Description

Technical Field

[0001] This invention belongs to the technical field of heat exchange equipment, and relates to a biomimetic manta ray turbulence insert and an enhanced heat exchange tube using the turbulence insert. Background Technology

[0002] Heat exchangers, as common heat and mass transfer process equipment, are widely used in industries such as petroleum, chemical, power, and metallurgy. In shell-and-tube heat exchangers, the heat transfer efficiency of the fluid in the tubes is often limited by the laminar sublayer near the tube wall. According to boundary layer theory, the fluid velocity is extremely low near the tube wall, resulting in significant thermal resistance, which becomes a key bottleneck restricting the improvement of the overall heat transfer coefficient. Therefore, disrupting the fluid boundary layer and enhancing the turbulence within the fluid are the core approaches to improving heat transfer.

[0003] To address the issues that existing turbulence-enhancing inserts can lead to problems such as the central support rod occupying the flow channel and scaling on the inner wall of the pipe while enhancing heat transfer, this invention, inspired by the specific body morphology of aquatic organisms in nature, has developed a biomimetic manta ray turbulence-enhancing insert. By inducing the fluid to generate strong swirling and longitudinal eddies, it effectively disrupts the thermal boundary layer of the pipe wall and promotes radial mixing of the fluid, thereby achieving highly efficient enhanced heat transfer. Summary of the Invention

[0004] One objective of this invention is to provide a biomimetic manta ray-inspired flow-deflecting insert that effectively solves the problem that existing flow-deflecting inserts, while enhancing heat transfer, cause the central support rod to occupy the flow channel and the inner wall of the tube to easily accumulate scale.

[0005] To achieve the above objectives, the present invention provides a biomimetic manta ray aerodynamic insert, comprising multiple three-dimensional variable curvature biomimetic manta ray aerodynamic units arranged along the axial direction.

[0006] Furthermore, the biomimetic turbulence insert consists of multiple biomimetic manta ray turbulence units arranged along the axial direction. Each biomimetic manta ray turbulence unit includes a biomimetic manta ray guide vane and a saddle-shaped connecting web. The biomimetic manta ray guide vane has a three-dimensional variable curvature surface structure, and the inner side of the biomimetic manta ray guide vane is connected by a saddle-shaped connecting web. The saddle-shaped connecting web is a streamlined twisted plate structure that extends along the axial direction and has a twist angle.

[0007] Furthermore, the axial misalignment angle between two adjacent biomimetic manta ray turbulence units is 30~90°.

[0008] Furthermore, the biomimetic manta ray turbulence unit includes 3 to 8 biomimetic manta ray guide vanes; the biomimetic manta ray guide vanes have an inward concave flow-facing and outward convex flow-reversing structure, and the leading edge adopts a swept-back streamline design.

[0009] Furthermore, the outer fixed end of the biomimetic manta ray guide vane has a streamlined twist angle relative to the inner connecting end, the twist angle being 15~45°; the blade surface of the biomimetic manta ray guide vane smoothly transitions outward from the saddle-shaped connecting web.

[0010] Furthermore, the saddle-shaped connecting web has a torsion angle of 10~60° along its axial extension direction, and the two ends of the saddle-shaped connecting web respectively form acute-angled flow-breaking blades, and the extension direction of the flow-breaking blades is tangent to the fluid injection direction.

[0011] Furthermore, the triangular connecting rib is located at the intersection of two adjacent saddle-shaped connecting webs, and its bottom edge is connected to the saddle-shaped connecting web to form a reinforcing structure that is recessed in the direction of the inner axis.

[0012] Another objective of this invention is to provide an enhanced heat exchange tube that effectively solves the problems of significantly increased flow resistance and easy scaling and clogging of the wall surface caused by existing turbulence-enhancing inserts while enhancing heat transfer.

[0013] To achieve the above objectives, the present invention provides an enhanced heat exchange tube, comprising a heat exchange tube shell and the biomimetic manta ray turbulence insert. The biomimetic manta ray turbulence unit is constructed by welding the blade tips together, fixing it along the axial tie rod, or positioning it through the central axis. The biomimetic manta ray turbulence insert is installed inside the enhanced heat exchange tube. The ratio of the axial center distance between adjacent biomimetic manta ray turbulence units to the inner diameter of the heat exchange tube shell is 0.5 to 3.0.

[0014] Compared with the prior art, the beneficial technical effects of the present invention are:

[0015] (1) This invention sets up a biomimetic manta ray turbulence insert in the heat exchange tube and uses three-dimensional variable curvature blades to induce longitudinal vortices that develop along the axial direction, thereby destroying the laminar boundary layer near the tube wall and thus significantly improving the convective heat transfer coefficient of the fluid in the tube with low energy consumption, achieving efficient heat exchange.

[0016] (2) The present invention utilizes strong near-wall secondary flow to flush the inner wall of the tube, effectively suppressing scaling on the inner wall of the tube and ensuring that the heat exchange efficiency inside the tube does not decrease significantly during the use of the enhanced heat exchange tube. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the biomimetic manta ray turbulence plug-in of the present invention.

[0018] Figure 2 This is a schematic diagram of the structure of the biomimetic manta ray turbulence insert and the enhanced heat exchange tube described in this invention.

[0019] Figure 3 This is an axial side view of the biomimetic manta ray turbulence plug-in of the present invention.

[0020] Figure 4 This is an axial top view of the biomimetic manta ray turbulence-inspired plug-in of the present invention.

[0021] Among them, 1. A biomimetic manta ray turbulence insert; 1-1. A biomimetic manta ray turbulence unit; 1-2. A saddle-shaped connecting web; 1-3. A biomimetic manta ray guide vane; 1-4. A triangular connecting rib; 2. A heat exchange tube. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments:

[0023] like Figures 1 to 4 As shown, a biomimetic manta ray turbulence unit of the present invention includes several biomimetic manta ray guide vanes and a saddle-shaped connecting web.

[0024] Example 1

[0025] like Figure 1 , Figure 3 and Figure 4 As shown, the biomimetic manta ray turbulence-inducing insert of the present invention consists of multiple biomimetic manta ray turbulence-inducing units 1-1 arranged in a staggered 90° pattern. Each biomimetic manta ray turbulence-inducing unit includes a saddle-shaped connecting web 1-2 and biomimetic manta ray guide vanes 1-3. Unlike the traditional design using a cylindrical shaft of equal diameter, this embodiment features streamlined optimization of the central support structure. The biomimetic manta ray guide vanes have a three-dimensional spatial variable curvature structure, with the inner sides of each vane tangentially connected by streamlined twisted saddle-shaped connecting webs. The intersection of the saddle-shaped connecting webs forms a triangular connecting rib 1-4. Geometrically, the web 1-2 exhibits a spatially twisted streamlined curved surface. The biomimetic manta ray guide vanes simulate the shape of a manta ray, having a concave frontal surface and a convex back surface. The leading edge of the vanes adopts a swept-back design, which can induce stable longitudinal vortices.

[0026] like Figure 1 , Figure 3 and Figure 4 As shown in the schematic diagram of the flow-disrupting insert, the saddle-shaped connecting web 1-2 is a straight plate with a certain curvature. The central ridge of this plate-like structure matches the fluid incident angle, dividing and guiding the central fluid to the blades on both sides with low resistance. The saddle-shaped connecting web 1-2 and the biomimetic manta ray guide blades 1-3 are welded at the end face, which allows the insert to withstand the impact of high-pressure fluid without twisting or deforming. This structural design not only significantly reduces the frontal area and lowers the flow pressure drop, but also utilizes its biomimetic manta ray structure to guide the fluid to flush the blade roots, effectively preventing the deposition of dirt.

[0027] Example 2

[0028] Based on Example 1, in order to reduce flow resistance and improve the overall stiffness of the structure, this example differs from the traditional design of a constant-diameter cylindrical shaft by optimizing the streamline shape of the central support structure. For example... Figure 2 As shown, multiple biomimetic manta ray-inspired flow control units 1-1 form a high-strength, tandem support structure. The flow cross-section in the central region of the pipe is freed up, significantly reducing the fluid's wetted perimeter and frictional resistance, allowing the fluid to flow more smoothly through the blade root region and avoiding the problem of easy clogging in the central part of traditional inserts.

[0029] The embodiments of this invention do not describe well-known technical solutions and characteristics in detail. Those skilled in the art can make modifications and improvements without departing from the technical solutions of this invention, and all such modifications and improvements fall within the scope of protection of this invention.

Claims

1. A biomimetic manta ray spoiler insert, characterized in that, The bionic manta ray spoiler unit is composed of multiple bionic manta ray spoiler units arranged in the axial direction, the bionic manta ray spoiler unit comprises a bionic manta ray guide vane and a saddle-shaped connecting web; the bionic manta ray guide vane is a three-dimensional variable-curvature curved surface structure, the inner side of the bionic manta ray guide vane is connected by a saddle-shaped connecting web, the saddle-shaped connecting web extends in the axial direction and has a streamlined twisted plate structure with a twist angle.

2. The biomimetic manta ray spoiler insert of claim 1, wherein, The two adjacent bionic manta ray spoiler units are axially offset by 30-90°.

3. The biomimetic manta ray spoiler insert of claim 1, wherein, The bionic manta ray spoiler unit comprises 3-8 bionic manta ray guide vanes; the bionic manta ray guide vane has an inward concave incident flow and outward convex backflow structure, and the leading edge adopts a backward-swept streamlined design.

4. The biomimetic manta ray spoiler insert of claim 1, wherein, The outer side fixed end of the bionic manta ray guide vane has a streamlined twist angle relative to the inner side connecting end, and the twist angle is 15-45°; the bionic manta ray guide vane has a smooth transition from the saddle-shaped connecting web to the outside.

5. The biomimetic manta ray spoiler insert of claim 1, wherein, The saddle-shaped connecting web has a twist angle of 10-60° in the axial extension direction thereof, the axial ends of the saddle-shaped connecting web form sharp flow-breaking edges, respectively, and the extension direction of the flow-breaking edges is tangent to the fluid incident direction.

6. The biomimetic manta ray spoiler insert of claim 1, wherein, The triangular connecting rib plate is arranged at the intersection of the two adjacent saddle-shaped connecting webs, the bottom edge of the triangular connecting rib plate is connected with the saddle-shaped connecting web, and a concave reinforcing structure is formed towards the inner side axial direction.

7. A heat exchange tube, characterized by The bionic manta ray spoiler unit is composed of multiple bionic manta ray spoiler units arranged in the axial direction, the bionic manta ray spoiler unit comprises a bionic manta ray guide vane and a saddle-shaped connecting web; the bionic manta ray guide vane is a three-dimensional variable-curvature curved surface structure, the inner side of the bionic manta ray guide vane is connected by a saddle-shaped connecting web, the saddle-shaped connecting web extends in the axial direction and has a streamlined twisted plate structure with a twist angle. The two adjacent bionic manta ray spoiler units are axially offset by 30-90°. The bionic manta ray spoiler unit comprises 3-8 bionic manta ray guide vanes; the bionic manta ray guide vane has an inward concave incident flow and outward convex backflow structure, and the leading edge adopts a backward-swept streamlined design. The outer side fixed end of the bionic manta ray guide vane has a streamlined twist angle relative to the inner side connecting end, and the twist angle is 15-45°; the bionic manta ray guide vane has a smooth transition from the saddle-shaped connecting web to the outside. The saddle-shaped connecting web has a twist angle of 10-60° in the axial extension direction thereof, the axial ends of the saddle-shaped connecting web form sharp flow-breaking edges, respectively, and the extension direction of the flow-breaking edges is tangent to the fluid incident direction. The triangular connecting rib plate is arranged at the intersection of the two adjacent saddle-shaped connecting webs, the bottom edge of the triangular connecting rib plate is connected with the saddle-shaped connecting web, and a concave reinforcing structure is formed towards the inner side axial direction. The bionic manta ray spoiler unit is composed of multiple bionic manta ray spoiler units arranged in the axial direction, the bionic manta ray spoiler unit comprises a bionic manta ray guide vane and a saddle-shaped connecting web; the bionic manta ray guide vane is a three-dimensional variable-curvature curved surface structure, the inner side of the bionic manta ray guide vane is connected by a saddle-shaped connecting web, the saddle-shaped connecting web extends in the axial direction and has a streamlined twisted plate structure with a twist angle. The two adjacent bionic manta ray spoiler units are axially offset by 30-90°. The bionic manta ray spoiler unit comprises 3-8 bionic manta ray guide vanes; the bionic manta ray guide vane has an inward concave incident flow and outward convex backflow structure, and the leading edge adopts a backward-swept streamlined design. The outer side fixed end of the bionic manta ray guide vane has a streamlined twist angle relative to the inner side connecting end, and the twist angle is 15-45°; the bionic manta ray guide vane has a smooth transition from the saddle-shaped connecting web to the outside. The saddle-shaped connecting web has a twist angle of 10-60° in the axial extension direction thereof, the axial ends of the saddle-shaped connecting web form sharp flow-breaking edges, respectively, and the extension direction of the flow-breaking edges is tangent to the fluid incident direction. The triangular connecting rib plate is arranged at the intersection of the two adjacent saddle-shaped connecting webs, the bottom edge of the triangular connecting rib plate is connected with the saddle-shaped connecting web, and a concave reinforcing structure is formed towards the inner side axial direction. The bionic manta ray spoiler unit is composed of multiple bionic manta ray spoiler units arranged in the axial direction, the bionic manta ray spoiler unit comprises a bionic manta ray guide vane and a saddle-shaped connecting web; the bionic manta ray guide vane is a three-dimensional variable-curvature curved surface structure, the inner side of the bionic manta ray guide vane is connected by a saddle-shaped connecting web, the saddle-shaped connecting web extends in the axial direction and has a streamlined twisted plate structure with a twist angle. The two adjacent bionic manta ray spoiler units are axially offset by 30-90°. The bionic manta ray spoiler unit comprises 3-8 bionic manta ray guide vanes; the bionic manta ray guide vane has an inward concave incident flow and outward convex backflow structure, and the leading edge adopts a backward-swept streamlined design. The outer side fixed end of the bionic manta ray guide vane has a streamlined twist angle relative to the inner side connecting end, and the twist angle is 15-45°; the bionic manta ray guide vane has a smooth transition from the saddle-shaped connecting web to the outside. The saddle-shaped connecting web has a twist angle of 10-60° in the axial extension direction thereof, the axial ends of the saddle-shaped connecting web form sharp flow-breaking edges, respectively, and the extension direction of the flow-breaking edges is tangent to the fluid incident direction. The triangular connecting rib plate is arranged at the intersection of the two adjacent saddle-shaped connecting webs, the bottom edge of the triangular connecting rib plate is connected with the saddle-shaped connecting web, and a concave reinforcing structure is formed towards the inner side axial direction. The bionic manta ray spoiler unit is composed of multiple bionic manta ray spoiler units arranged in the axial direction, the bionic manta ray spoiler unit comprises a bionic manta ray guide vane and a saddle-shaped connecting web; the bionic manta ray guide vane is a three-dimensional variable-curvature curved surface structure, the inner side of the bionic manta ray guide vane is connected by a saddle-shaped connecting web, the saddle-shaped connecting web extends in the axial direction and has a streamlined twisted plate structure with a twist angle. The two adjacent bionic manta ray spoiler units are axially offset by 30-90°. The bionic manta ray spoiler unit comprises 3-8 bionic manta ray guide vanes; the bionic manta ray guide vane has an inward concave incident flow and outward convex backflow structure, and the leading edge adopts a backward-swept streamlined design. The outer side fixed end of the bionic manta ray guide vane has a streamlined twist angle relative to the inner side connecting end, and the twist angle is 15-45°; the bionic manta ray guide vane has a smooth transition from the saddle-shaped connecting web to the outside. The saddle-shaped connecting web has a twist angle of 10-60° in the axial extension direction thereof, the axial ends of the saddle-shaped connecting web form sharp flow-breaking edges, respectively, and the extension direction of the flow-breaking edges is tangent to the fluid incident direction. The triangular connecting rib plate is arranged at the intersection of the two adjacent saddle-shaped connecting webs, the bottom edge of the triangular connecting rib plate is connected with the saddle-shaped connecting web, and a concave reinforcing structure is formed towards the inner side axial direction. The bionic manta ray spoiler unit is composed of multiple bionic manta ray spoiler units arranged in the axial direction, the bionic manta ray spoiler unit comprises a bionic manta ray guide vane and a saddle-shaped connecting web; the bionic manta ray guide vane is a three-dimensional variable-curvature curved surface structure, the inner side of the bionic manta ray guide vane is connected by a saddle-shaped connecting web, the saddle-shaped connecting web extends in the axial direction and has a streamlined twisted plate structure with a twist angle. The two adjacent bionic manta ray spoiler units are axially offset by 30-90°. The bionic manta ray spoiler unit comprises 3-8 bionic manta ray guide vanes; the bionic manta ray guide vane has an inward concave incident flow and outward convex backflow structure, and the leading edge adopts a backward-swept streamlined design. The outer side fixed end of the bionic manta ray guide vane has a streamlined twist angle relative to the inner side connecting end, and the twist angle is 15-45°; the

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