CN101532798B - Reinforced heat transfer element of truncated cylindrical surface wing type vortex generator - Google Patents
Reinforced heat transfer element of truncated cylindrical surface wing type vortex generator Download PDFInfo
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- CN101532798B CN101532798B CN2009100812944A CN200910081294A CN101532798B CN 101532798 B CN101532798 B CN 101532798B CN 2009100812944 A CN2009100812944 A CN 2009100812944A CN 200910081294 A CN200910081294 A CN 200910081294A CN 101532798 B CN101532798 B CN 101532798B
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Abstract
The invention discloses a reinforced heat transfer element of a truncated cylindrical surface wing type vortex generator, belonging to the field of heat transfer parts of heat exchanger. The vertical surface of a wing type vortex generator is bent into a semi cylindrical surface or a semi elliptic cylindrical surface to be arranged on a fin tube or a fin tube of a plate-fin heat exchanger or other passage flow heat exchanger plate surface in a certain incident flow impact angle and a certain array manner so as to induce the end longitudinal vortex and the root part horse shoe vortexes to couple to be thinned or destruct the boundary layer clinging to the wall face or reinforce the turbulence intensity to realize the passive reinforced heat exchange and improve the efficiency of the heat exchanger. In addition, due to the streamline surface, the shape resistance is reduced, thus lowering the flowing pressure loss and the fluid transportation energy consumption. The vortex generator can be manufactured by metal or other bendable molding materials, has the characteristics of simple manufacturing and convenient installation, and has extensive application prospect and promotion value in gas-liquid or gas-gas heat exchangers.
Description
Technical field
The invention belongs to the heat exchanger heat transfer part field, particularly a kind of reinforced heat transfer element of truncated cylindrical surface wing type vortex generator.Be that aerofoil profile (dalta wing, RECTANGULAR WINGS, tapered airfoil) eddy generator facade is bent to semi-cylindrical or semiellipse cylinder form specifically, be arranged on finned tube or the plate-fin heat exchanger fin or on other passage stream heat exchanger plate face necessarily to meet the stream angle of attack and array way, thereby the boundary layer or the increasing turbulence intensity of inducing end longitudinal shrinking turbulence and root water chestnut vortex system coupling attenuate or destruction to be close to wall realize the passive type enhanced heat exchange, improve heat exchanger effectiveness.
Background technology
Solution-air or gas-gas (vapour) heat-exchange apparatus is widely used in the energy, petrochemical industry, refrigeration, building, metallurgy, food processing, aviation and some other industrial dynamic process systems, and occupies considerable capital investment shares therein.How to improve and optimize design of heat exchanger, improve heat transfer property, to reduce its power and metal consumption, the saving energy and space, to become the problem that must solve in the modern industry evolution.In recent years, under the promotion of heat conduction reinforced technology, emerge various modern designs, have the compact heat exchanger of high-performance heat exchange surface, the focus that R and D are paid close attention to is to improve the rate of heat transfer of unit are and reduce frictional resistance.In the gas flow heat exchanger, the restriction of frictional resistance forces the designer to select lower mass velocity, and the low-quality flow of gas and low thermal conductivity (being lower than most liquid) cause the low heat transfer speed of unit heating surface; For liquid suction heat exchanger, the coefficient of heat transfer of gas side is much smaller than the coefficient of heat transfer of hydraulic fluid side (air side be about water side 1/70～1/40), the thermal resistance of air side is usually considerably beyond wall thermal resistance and liquid side thermal resistance, and become the control thermal resistance of so-called diabatic process, therefore the performance of heat exchanger often is subject to the heat exchange of gas side, and improving the heat exchange of gas side is the key point of dealing with problems.
The method of strengthening the heat exchange of gas side can have disturbance that improves refrigerant flow rate, the vortex dead area that occurs when eliminate fluid flows, increases fluid and the development that mixes, destroys fluid boundary layer or laminar sublayer, change heat-transfer surface surface appearance etc. on principle.As the monophasic fluid of no phase transformation, gas side thermal resistance is mainly in the boundary layer or laminar sublayer, and the thickness of managing attenuate boundary layer or laminar sublayer is effective and efficient manner.According to whether needing the external world to provide energy to be divided in the enhancements that is adopted: active and passive type.Active needs utilize external energy to reach the purpose of augmentation of heat transfer, and it comprises: mechanical means, surface vibration, fluid oscillation, electric field, magnetic field and jet impact etc.
Passive type augmentation of heat transfer technology does not need directly to use exterior power, comprises adopting treatment surface, rough surface, extended surface, disturbing flow device, bumpy flow device, helix tube and additive etc.
More than listed be to strengthen the conventional means that the gas side is conducted heat.Though method is various, the common ground of intensified heat transfer method is to be close to the boundary layer of wall or to strengthen turbulence intensity with attenuate or destruction by disturbance mostly.Inducing the vortex enhanced heat exchange is that a kind of passive, autotelic dependence produces the method that secondary stream comes augmentation of heat transfer, a kind of comparatively common method is to utilize eddy generator (Vortex Generator, hereinafter to be referred as VG), this method receives increasing concern in recent years because of it is economical and practical.Because the good effect of longitudinal shrinking turbulence aspect augmentation of heat transfer, long direction eddy generator become the focus of people's research.Mainly based on aerofoil profile, column type long direction eddy generator.
Traditional aerofoil profile eddy generator such as dalta wing, RECTANGULAR WINGS, tapered airfoil have stronger enhanced heat exchange effect owing to producing stronger end longitudinal shrinking turbulence, but because friction and form drag are bigger, cause flow pressure drop also bigger; Column type eddy generator (as cylinder, cylindroid) root produces the water chestnut vortex system, though form drag is little, the enhanced heat exchange weak effect is a little.The applicant once proposed a kind of bevel semiellipse cylinder vortex generator in the past, produced vertical whirlpool, end in its end, formed the water chestnut vortex system at root.The acting in conjunction in two kinds of whirlpools bunch obviously strengthens the augmentation of heat transfer effect, and its streamlined cylinder greatly reduces form drag simultaneously.But because difficulty of processing is bigger, consumptive material and manufacturing cost are bigger.The reinforced heat transfer element of truncated cylindrical surface wing type vortex generator that the present invention proposes has solved this problem, and is practical more reliable, for raising heat exchanger effectiveness, energy-saving material-saving important meaning arranged.
Summary of the invention
The objective of the invention is reinforced heat transfer element of truncated cylindrical surface wing type vortex generator, it is characterized in that, aerofoil profile eddy generator facade is bent to semi-cylindrical or semiellipse cylinder form, with meet stream angle of attack β and array way is arranged on finned tube or the plate-fin heat exchanger fin or passage stream heat exchanger plate face on, thereby induce end longitudinal shrinking turbulence and root water chestnut vortex system coupling attenuate or destroy boundary layer or the increasing turbulence intensity realization passive type enhanced heat exchange of being close to wall, improve heat exchanger effectiveness; Described aerofoil profile is a kind of in RECTANGULAR WINGS, tapered airfoil or the dalta wing.
The invention has the beneficial effects as follows that truncated cylindrical surface wing type vortex generator of the present invention has not only produced lasting three-dimensional water chestnut vortex system at root, and owing to the existence of its hypotenuse produces strong vertical whirlpool, end, eliminated recirculating zone behind the wing.This comprehensive function of vertical whirlpool, end and water chestnut vortex system, not only intensity is big but also relatively more lasting, dashes the volume wall consumingly, and the boundary layer laminar sublayer is played disturbance and destruction, makes that the heat convection between fluid and the wall effectively strengthens.In addition, importantly, make form drag reduce, thereby reduced flowing pressure loss, reduce fluid transportation energy consumption owing to its fairing ace.This kind vortex generator can have metal or other flexible moulding material processing, has and makes simply characteristics easy for installation.
Description of drawings
Fig. 1 is truncated cylindrical surface wing type vortex generator profile and structural representation, and wherein Fig. 1 (a) is a front view; Fig. 1 (b) is a side view; Fig. 1 (c) is a vertical view.
Fig. 2 arranges schematic diagram for truncated cylindrical surface wing type vortex generator at heat exchanger fin.
The specific embodiment
The invention provides the reinforced heat transfer element of truncated cylindrical surface wing type vortex generator that a kind of enhanced heat exchange is effective, fluid resistance loss is little, processing and manufacturing is simple, easy for installation.Described reinforced heat transfer element of truncated cylindrical surface wing type vortex generator, be to serve as to cut sth. askew according to the α angle beginning to form tapered airfoil or dalta wing (shown in Fig. 1 (a)) with a stile top, again its facade be bent into semi-cylindrical or semiellipse cylinder form with a/b curvature to another stile with RECTANGULAR WINGS; Or earlier the RECTANGULAR WINGS facade is bent into semi-cylindrical or semiellipse cylinder form with a/b curvature, cutting sth. askew according to the α angle to another stile from a stile top forms (shown in Fig. 1 (b), Fig. 1 (c)) again.The length of RECTANGULAR WINGS, height, gauge or ratio require with heat exchanger form and channel size respective design and decide; Chamfer angles alpha changes between diagonal and horizontal line angle at 0 °; Facade constitutes the semiellipse cylinder or the semi-cylindrical of different curvature, and a/b changes between 0-1, and the semiellipse cylinder develops into the plane during a/b=0, and the semiellipse cylinder develops into semi-cylindrical during a/b=1; The length of RECTANGULAR WINGS, height, gauge or ratio require with heat exchanger form and channel size respective design and decide as Fig. 1;
Described eddy generator material can adopt but be not limited to easily cutting of the material of heat exchanger own or other, the crooked material of installing (comprising metal).Its material heatproof and other character should satisfy heat exchanger and allow the condition of work requirement.
The mounting means of described eddy generator in heat exchanger plate, finned surface or passage stream can adopt but be not limited to modes such as welding, bonding, riveted joint, embedding or punching press.
The arrangement of described eddy generator in heat exchanger plate, finned surface or passage stream decide according to heat exchanger form, structure and designing requirement, can but be not limited in pairs, arrange more, multiple row; In-line arrangement, suitable row or wrong row, stagger arrangement; All around mutual spacing and the relative position in heat exchanger plate, finned surface or passage stream are decided according to designing requirement such as heat exchanger, service condition for they.It is met stream angle of attack β and can change (as shown in Figure 2) in 0 ° of-90 ° of scope, but is not limited to this scope.
Claims (3)
1. reinforced heat transfer element of truncated cylindrical surface wing type vortex generator, described truncated cylindrical surface wing is RECTANGULAR WINGS, tapered airfoil or dalta wing shape, heat exchanger is selected material own for use or is comprised the easy cutting of metal, the material of flexible installation, and its material heatproof should satisfy the requirement that heat exchanger allows condition of work; It is characterized in that, the wing type vortex generator facade is bent to semi-cylindrical or semiellipse cylinder form, with meet stream angle of attack β and array way is arranged on finned tube or the plate-fin heat exchanger fin or passage stream heat exchanger plate face on, thereby induce end longitudinal shrinking turbulence and root water chestnut vortex system coupling attenuate or destroy boundary layer or the increasing turbulence intensity realization passive type enhanced heat exchange of being close to wall, improve heat exchanger effectiveness.
2. according to the described reinforced heat transfer element of truncated cylindrical surface wing type vortex generator of claim 1, it is characterized in that, serves as to cut sth. askew according to mis-cut angle α to another stile the beginning to form tapered airfoil or dalta wing with RECTANGULAR WINGS with a stile top, again its facade is bent into semi-cylindrical or semiellipse cylinder form with a/b curvature; Or earlier the RECTANGULAR WINGS facade is bent into semi-cylindrical or semiellipse cylinder form with a/b curvature, and cutting sth. askew according to mis-cut angle α to another stile from a stile top forms again, and its mis-cut angle α changes between diagonal and horizontal line angle at 0 °; The minor axis radius of semiellipse cylinder is 0＜a/b≤1 with the ratio of major axis radius.
3. according to the described reinforced heat transfer element of truncated cylindrical surface wing type vortex generator of claim 1, it is characterized in that the mounting means of described eddy generator in heat exchanger plate, finned surface or passage stream adopts welding, bonding, riveted joint, embedding or impact style.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009100812944A CN101532798B (en) | 2009-03-31 | 2009-03-31 | Reinforced heat transfer element of truncated cylindrical surface wing type vortex generator |
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| CN2009100812944A CN101532798B (en) | 2009-03-31 | 2009-03-31 | Reinforced heat transfer element of truncated cylindrical surface wing type vortex generator |
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| CN101532798A CN101532798A (en) | 2009-09-16 |
| CN101532798B true CN101532798B (en) | 2011-12-28 |
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| CN108917436B (en) * | 2018-08-28 | 2020-09-18 | 南京工业大学 | Novel oval twisted tube heat exchanger with vortex generator |
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Granted publication date: 20111228 Termination date: 20140331 |