EP2909552A1 - Buse à jet longue portée pour grandes profondeurs de pénétration - Google Patents

Buse à jet longue portée pour grandes profondeurs de pénétration

Info

Publication number
EP2909552A1
EP2909552A1 EP13789171.9A EP13789171A EP2909552A1 EP 2909552 A1 EP2909552 A1 EP 2909552A1 EP 13789171 A EP13789171 A EP 13789171A EP 2909552 A1 EP2909552 A1 EP 2909552A1
Authority
EP
European Patent Office
Prior art keywords
diffuser
flow channel
central body
nozzle
fluid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13789171.9A
Other languages
German (de)
English (en)
Other versions
EP2909552B1 (fr
Inventor
Bernhard Weigand
Sebastian Spring
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Universitaet Stuttgart
Original Assignee
Universitaet Stuttgart
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Universitaet Stuttgart filed Critical Universitaet Stuttgart
Publication of EP2909552A1 publication Critical patent/EP2909552A1/fr
Application granted granted Critical
Publication of EP2909552B1 publication Critical patent/EP2909552B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/06—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in annular, tubular or hollow conical form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
    • B05B1/3402—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to avoid or to reduce turbulencies, e.g. comprising fluid flow straightening means

Definitions

  • the invention relates to a diffuser and a method for calculating the geometry of a diffuser.
  • Nozzles are needed for a variety of technical problems, for example when drying components from long distances. Drying or tempering of components can be necessary both in the field of body painting, glass production or in the field of building air conditioning. For this purpose, a nozzle is needed that can effectively and effectively dry and / or aerate a good from a distance as large as possible. A very homogeneous velocity distribution of a dry air on the material to be dried can be of great importance, for example to achieve the most uniform possible drying of the material.
  • jet nozzles that can be traversed by a fluid for drying a distant good.
  • Such jet nozzles have in the interior a flow channel whose cross-section decreases in the flow direction.
  • a nozzle is known in which a pressure loss inside the nozzle is minimized.
  • a nozzle with a tapering cross-section is used, in which a cartridge-shaped obstacle is introduced into the flow channel.
  • the nozzle is intended for use at pressures of no more than 2 psi.
  • the document US 2006/0151633 relates to a nozzle with output-side demolition edges, which are inclined inwards. This creates a vortex field that determines the beam field in the wake of a fluid flowing through the nozzle.
  • the invention has for its object to provide a jet nozzle with a uniform distribution of velocity as possible in the far field of emerging from the jet nozzle fluid, wherein a pressure loss is reduced to achieve large penetration depths.
  • One aspect of the invention relates to a diffuser having a nozzle inlet, a nozzle exit and a flow channel extending from the nozzle inlet to the nozzle exit in a main flow direction, wherein the flow channel is bounded at its cross-sectional ends by diffuser walls and has a smaller cross-sectional area at the nozzle entrance than at the nozzle exit a central body is arranged in the flow channel within the diffuser.
  • the diffuser is designed as a long throw nozzle.
  • a diffuser is a special type of nozzle in which the cross-section of the flow channel does not taper, but widen as in a classic nozzle. Often, the diffuser is also referred to as a counterpart to the nozzle. While in a conventional nozzle, the cross-section of the flow channel tapers in the main flow direction, which causes an increase in velocity and a pressure drop in a nozzle flowing through the fluid, a diffuser causes the opposite: a fluid flowing through a diffuser is decelerated as it flows through the diffuser, wherein its pressure elevated.
  • the cross-sectional areas of the flow channel at the nozzle inlet and at the nozzle outlet can be compared with one another. If the cross-sectional area at the nozzle outlet is greater than the cross-sectional area at the nozzle inlet, then the nozzle may be a diffuser; conversely, the area ratio is a classic nozzle.
  • the flow channel of the diffuser is arranged in the interior of the diffuser and designed essentially as a free space.
  • the flow channel is from Limited diffuser walls, which determine the shape of the flow channel.
  • the diffuser walls are formed as part of the diffuser.
  • the diffuser is designed and provided to be flowed through by a fluid in a predetermined direction.
  • the predetermined direction extends from the nozzle entrance to the nozzle exit and is referred to as the main flow direction. In the main flow direction thereby increases the cross-section of the flow channel, which is bounded by the diffuser walls.
  • This enlargement or expansion of the flow channel may be, for example, continuous, stepped, logarithmic, exponential, along a polynomial function or along a combination of the aforementioned shape changing functions.
  • a classic diffuser reduces the speed of a fluid passing through the diffuser and increases the pressure. Deceleration of the fluid is not always desirable for a jet nozzle, as this may result in a very uneven velocity distribution across the cross-section. Therefore, a central body is arranged in the interior of the flow channel, ie in the interior of the diffuser, which is designed as a flow body. The central body is arranged in the diffuser so that it is flowed around by a fluid flowing through the diffuser in the main flow direction. By introducing the central body into the flow channel, the flow behavior, in particular the speed and the pressure of the fluid flowing through the diffuser, is influenced.
  • the speed and the pressure of the fluid flowing through the flow channel can be influenced and / or determined both in the near field and in the far field by the shape of the central body.
  • the central body may cause a reduction in the free cross-sectional area of the flow channel at the nozzle exit.
  • the freely permeable surface portion may be of the same size or smaller.
  • the freely flow-through surface portion of the cross-sectional area of the flow channel which can be traversed by a fluid flowing through the diffuser.
  • the space in the flow channel, which is occupied by the central body can not be traversed by a fluid.
  • the central body is at least partially disposed in the interior of the flow channel. A part of the central body may protrude from the flow channel. In this case, the central body is preferably arranged such that it is arranged in a space region near or at the nozzle exit. The space region of the flow channel, which is formed adjacent to the nozzle inlet, is preferably formed free of a central body. The central body may be spaced from the diffuser walls in the diffuser.
  • Such a diffuser with a central body arranged in the flow channel can be used to achieve particularly large penetration depths and enables a homogeneous velocity distribution in the Femfeld of the ejected from the diffuser fluid.
  • the diffuser reduces the pressure loss of the fluid compared to a diffuser without a central body and serves to achieve large penetration depths. In existing drying systems, the diffuser can lead to the reduction of a required pumping capacity at a constant penetration depth.
  • the far field is the beam area after the nozzle exit where atmospheric turbulence dominates the beam spread. In the far field, in particular, no more core beam can be detected in the beam field. Usually, the far field starts at a distance after the nozzle exit, which is six to eight times the diameter of the cross section of the nozzle exit.
  • the exact shape or geometry of the central body can be calculated using a computer simulation to obtain a certain penetration or temperature distribution in the jet for a particular fluid.
  • the central body may be formed differently shaped.
  • the central body may be formed, for example, as an ellipsoid, as a pyramid, or as a cuboid body.
  • the central body is designed as a flow obstacle and has a volume and a shape that significantly influences the flow behavior of a fluid flowing through the diffuser.
  • the present invention relates to a diffuser that achieves a particularly favorable heat transfer to the target.
  • the diffuser can be designed to be free of inner edges at its diffuser exit. This means that the diffuser at its diffuser outlet in longitudinal section has at least straight or outwardly inclined edges.
  • the output edges may be formed in particular rounded. As a result, a desired and / or predetermined flow distribution is achieved.
  • the diffuser is designed as a long throw nozzle.
  • a jet nozzle is a nozzle which is designed and provided for the greatest possible penetration depths.
  • a jet nozzle can cause a desired, in particular a substantially homogeneous velocity distribution of the ejected fluid in the far field.
  • the penetration depth of a nozzle determines the distance or the distance from the nozzle outlet at which the fluid flowing through the nozzle has a desired flow behavior after flowing through the nozzle.
  • the penetration depth may mean a predetermined distance by which a material to be dried is spaced from the nozzle exit of the long throw nozzle.
  • the penetration depth may be e.g. be between 2 and 3 m.
  • the central body is arranged in the middle of a cross section through the flow channel. Due to the arrangement of the central body in the middle of the flow channel, the central body can be flowed around on all its sides by a fluid flowing through the diffuser. As a result, the central body can influence the fluid or the speed and the pressure of the fluid with all its body surfaces and sides.
  • the central body can be held by a holder in the flow channel, that it is arranged at a predetermined location in the interior of the flow channel.
  • the central body does not have to be arranged along the entire central axis of the flow channel, but can for example only in the second half of the flow channel, ie the nozzle outlet facing half of the flow channel, be arranged centrally in this.
  • the central body is shaped and arranged in the flow channel such that the central body on the diffuser walls reduces flow separation of a fluid flowing through the diffuser.
  • a fluid that flows through a widening flow channel or a diffuser can experience different flow behavior. If an opening angle or an extension of the flow channel in the flow direction is sufficiently small, this is called an applied flow behavior or a fluctuating, partially detached flow behavior. If the diffuser has a more open flow channel, that is to say a further widening flow channel, the flow in the flow channel can lose its pulsating character, wherein one speaks of a detached flow behavior. In a detached flow arise in the flow channel and in the wake flow vortex of the fluid.
  • the central body is shaped and arranged in the flow channel, that it reduces flow separation and / or completely prevented. As a result, the flow behavior of the fluid is improved.
  • the central body can influence the flow behavior of the fluid not only in the interior of the diffuser, but also in the far field of the fluid, ie a space region into which the already exited from the diffuser fluid penetrates.
  • the central body is rotationally symmetrical with respect to a central axis of the flow channel.
  • the central body itself be rotationally symmetrical, but also also the diffuser, in particular the diffuser walls, which define the flow channel.
  • a rotationally symmetrical design of the central body and / or the diffuser and / or the flow channel can lead to a particularly homogeneous velocity and pressure distribution in the far field of the fluid.
  • the nozzle exit has at least ten percent greater cross-sectional area than the nozzle entrance.
  • the cross section of the flow channel widens in the main flow direction preferably steadily. With a ten percent larger area is meant the total area of the respective cross-section.
  • the cross-section at the nozzle exit may have a partial region of the central body which reduces the free cross-sectional area.
  • the cross-sectional area of the nozzle exit may also be at least 50% or 100% larger than the cross-sectional area of the nozzle entrance.
  • the flow channel of the diffuser is formed so widening in the main flow direction that the flow channel without the central body would cause a flow separation of a fluid flowing through the diffuser.
  • the flow channel of the diffuser is designed so that it expands so much that it would cause a flow separation without the central body.
  • the diffuser without the central body would be unsuitable as a jet nozzle and would lead to a deterioration of the flow quality of the fluid.
  • the central body is formed in the diffuser so as to prevent or at least reduce this flow separation.
  • the central body is replaceably mounted in the flow channel of the diffuser.
  • the diffuser may have a plurality of central bodies which may be mounted in the flow channel depending on the intended use of the diffuser.
  • Such variable central bodies can lead to very different flow behavior of a fluid flowing through the diffuser.
  • a holder can be designed to receive different central body in the flow channel so that the central body are detachably fastened to the holder.
  • the diffuser is designed and provided to be flowed through by a predetermined fluid under a predetermined pressure and a predetermined speed in the main flow direction. The exact shape of the diffuser walls and / or the central body may be tuned to a particular fluid.
  • the fluid for example, ambient air may be used for drying goods.
  • a special gas mixture may be provided for drying, which can be inserted under the predetermined pressure in the nozzle inlet of the diffuser.
  • the exact shape and geometry of the diffuser including the central body is tuned to this predetermined fluid.
  • the pressure and / or the speed of the fluid can be predetermined with which the fluid is introduced into the nozzle inlet.
  • the diffuser may also be provided for use with a predetermined fluid having different pressures and / or for use with different fluids.
  • the fluid may in particular be liquid and / or gaseous.
  • the diffuser walls are inclined in longitudinal section at least in places by an expansion angle of at least 10 ° with respect to the central axis of the flow channel.
  • an opening angle of at least 7-10 ° in the case of a diffuser, it is assumed that a flow separation occurs.
  • the diffuser walls of the diffuser are in this case designed so that a flow separation would result without the central body, since the opening angle is at least 10 °.
  • the opening angle of the flow channel with respect to its central axis does not have to be at least 10 ° along the entire flow channel, but may also be only so steep at places.
  • the opening angle of the flow channel is at least in places from 10 ° to 30 °, preferably from 15 ° to 25 °.
  • the central body is shaped to effect a substantially homogeneous flow velocity distribution perpendicular to the directional vector of the main flow direction in the far field of a fluid exiting the diffuser.
  • the near field is the area of the space into which the fluid flowing out of the diffuser flows directly after leaving the diffuser, that is to say a space region which is arranged adjacent to the diffuser exit.
  • an inhomogeneous velocity distribution of the fluid may be present due to the central body.
  • the central body can cause a "deterioration" in the flow characteristics of the fluid.
  • the central body can be shaped and calculated so that it causes a homogeneous velocity distribution or a defined temperature distribution in the far field, in particular at a predetermined penetration depth or target depth of the fluid.
  • the diffuser may be for use in drying a product at a predetermined distance from the nozzle exit. This predetermined distance corresponds to the penetration depth or the target depth of the diffuser.
  • the central body is shaped and / or calculated so that it causes a uniform velocity distribution or a defined temperature distribution at this target depth - measured from the nozzle exit. This leads to a uniform drying of a good such as a body painting, a liquid glass, etc.
  • a plurality of central bodies are arranged in the flow channel within the diffuser.
  • the central bodies are shaped so that a fluid, after it has flowed out of the diffuser, has an optimal flow distribution.
  • Another aspect relates to a method for calculating the geometry of a diffuser designed as a long-throw nozzle with the steps:
  • the shape of a holder for the central body in the interior of the flow channel can be further included. Furthermore, this method can be used to achieve certain different penetration depths in the case of identically shaped diffuser walls having a differently shaped geometry of the central body. In this method, therefore, only a new geometry of the central body is calculated, wherein the geometry of the diffuser walls enters as a boundary condition in the calculation.
  • the geometry of the central body can be optimized so that at a predetermined distance from the diffuser exit a predetermined, in particular homogeneous heat transfer takes place. Furthermore, the geometry of the central body can also be optimized to the effect that the pressure of the medium flowing into the diffuser is kept to a minimum, so the power requirement is minimized. As a boundary condition, the feed pressure of the fluid and / or the geometry of the diffuser walls can be included in the calculation.
  • the physical properties of the fluid, the geometry of the diffuser (and thus the geometry of the nozzle walls) and / or a fixed distance from the nozzle outlet can be specified.
  • the separating properties of the fluid jet can be optimized.
  • the fixed distance may e.g. be the predetermined penetration depth.
  • a given pressure requirement for a fan feeding the fluid into the nozzle inlet e.g. a minimum printing requirement as a target.
  • a maximum heat transfer to a good i. the highest possible heat content of the fluid is delivered to the product, e.g. for cooling or heating the material.
  • the heat transfer distribution of the fluid can be optimized for its homogeneity.
  • the fluid jet can be optimized after exiting the nozzle exit to the effect that the fluid jet continues as straight as possible.
  • the fluid jet can be optimized after exiting the nozzle exit to the effect that the fluid jet has a predetermined, limited impact surface on a good.
  • An exit velocity of the fluid from the nozzle exit may be specified as the target criterion, e.g. a minimum or maximum exit velocity.
  • One or more of these criteria may be selected as the target criteria, after which the procedure is terminated.
  • the geometry of the central body (and possibly the diffuser walls) is varied until the target criteria are achieved taking into account the predetermined boundary conditions.
  • this method provides a certain form of a diffuser with a specific geometry of a central body, the use of which the target criteria are met.
  • One aspect relates to using a diffuser as described above for drying at least one product, wherein the material may be spaced from the nozzle exit of the diffuser at a predetermined distance.
  • a diffuser can also be used for air conditioning.
  • Figure 1 is a schematic sectional view of a diffuser without
  • Figure 2 is a schematic sectional view through a diffuser with a
  • FIG. 3 is a schematic representation of the velocity distribution of a
  • Figure 4 is a schematic representation of the velocity distribution of a
  • Figure 5 is a schematic representation of the velocity distribution of a
  • Fluids flowing through a diffuser with a second central body Fluids flowing through a diffuser with a second central body.
  • FIG. 1 shows a diffuser 1 with a nozzle inlet 2 and a nozzle outlet 3, the nozzle outlet 3 having a cross-sectional area A which is larger than a cross-sectional area E of the nozzle inlet 2.
  • the Diffuser 1 has diffuser walls 6, which delimit a free space in the interior of the diffuser 1 as a flow channel 4.
  • the diffuser 1 is formed substantially rotationally symmetrical with respect to a central axis M of the flow channel 4.
  • the diffuser 1 is designed and provided for introducing a fluid (not shown) into the flow channel 4 in a main flow direction H.
  • the nozzle inlet 2 is open along its cross-sectional area E.
  • the main flow direction H points along the center axis M of the flow channel 4 from the nozzle inlet 2 to the nozzle outlet 3.
  • the diffuser 1 is designed such that the fluid which has flowed into the flow channel at the nozzle inlet 2 flows out of the flow channel 4 and thereby the diffuser 1 leaves.
  • FIG. 2 shows a diffuser 20 which is of identical construction to the diffuser 1 shown in FIG.
  • the diffuser 20 has a nozzle inlet 22, a nozzle outlet 23, a flow channel 24 and nozzle walls 26, which are dimensioned and formed as in the diffuser 1.
  • a cross-sectional area E of the nozzle entrance 22 is smaller than a cross-sectional area A of the nozzle exit 23.
  • the flow channel 24 has a rectilinear central axis M.
  • the center axis of the flow channel 24 may also be curved.
  • the diffuser 20 has a central body 25, which is fastened to the diffuser walls 26 in the interior of the flow channel 24.
  • the central body 25 is spaced from the diffuser walls 26 and centrally disposed in the flow channel 24.
  • the central body 25 is formed with respect to the central axis M is substantially rotationally symmetrical.
  • the central body 25 may be formed, for example, as an ellipsoid, drop-shaped or similar and forms a three-dimensional flow obstruction for the diffuser 20 along the Flow channel 24 flowing fluid.
  • the central body 25 is arranged in the half of the flow channel, which is formed adjacent to the nozzle outlet 23.
  • the other half of the flow channel, which is formed adjacent to the nozzle inlet 22, is formed Prima Eisenoko.
  • the central body 25 influences the flow behavior of a fluid flowing through the diffuser.
  • the influence of the central body on the flow behavior becomes clear by comparison of the velocity distribution in the near field N and in the field F of the diffuser 1 (see FIG. 1) with the near field N and in the far field F of fluid flowing out of the diffuser 20 (see FIG. 2).
  • the cross-section of the flow channel 4 of the diffuser 1 widens in the main flow direction H so far that within the flow channel 4 adjacent to the nozzle outlet 3 vortex fields and backflows or flow separations W1 arise at the diffuser walls 6. This results in at least one side of the diffuser, a stationary separation region in which the flow loses its pulsating character.
  • a fluid flowing through the diffuser 1 has a relatively homogeneous velocity distribution in the near field N.
  • the velocity distributions of the fluid in the respective near and far field are shown in FIGS. 1 and 2 by means of graphs.
  • the velocity distribution is inhomogeneous. Adjacent to the extension of the center axis M, the velocity of the fluid particles is greater than the velocity of fluid particles farther from the extension of the center axis M and moving away from the diffuser 1 in the far field.
  • a beam field S ' which, as shown in Figure 2, has a different flow behavior.
  • the central body 25 prevents the occurrence of vortices both in the interior of the diffuser 20 and in the jet field S 'of the fluid discharged from the diffuser 20.
  • the velocity distribution in the near field N due to the central body 25 has a minimum near the extension of the central axis M
  • the velocity distribution in the far field F of the beam field S 'over long distances perpendicular to the extension of the central axis M is substantially homogeneous.
  • the diffuser 20 shown in FIG. 2 is suitable for use as a long-throw nozzle, for example for drying components at great distances.
  • the components are preferably arranged in far field F.
  • the distance of the near field N and the far field F from the nozzle exit depends i.a. after the pressure of the fluid introduced into the diffuser.
  • greater penetration depths i. greater distances of the far field are achieved by the diffuser 20 with homogeneous velocity distributions.
  • the required pumping power can be reduced by introducing a fluid at a reduced pressure into the diffuser 20. Through the central body 25, a flow separation in the vicinity of the diffuser walls 26 is not only reduced, but prevented.
  • the central body 25 may be formed exchangeable, that is, the diffuser 20 may be equipped with different central bodies, which are calculated and shaped for different penetration depths.
  • the central body 25 may be secured in a not shown in the figures holder in the interior of the flow channel 24.
  • a single central body may be provided for a particular application, or a plurality of central body for a single application.
  • the diffuser may have cross-sectional diameters of 150 mm to 300 mm and be provided, for example, for drying a product spaced from 2 to 3 meters from the diffuser.
  • the diffuser may thus be provided for dimensionless distances L / D of about 6 to 20.
  • L denotes the intended distance of the material from the diffuser exit (eg the penetration depth) and D the diameter of the diffuser at the diffuser exit.
  • the central body 25 fills in sections at least 10%, preferably at least 25% of the cross-sectional area of the flow channel 24 from.
  • the exact shape and dimensioning of the central body 25 may be formed depending on a planned field of application of the diffuser 20.
  • FIG. 3 shows a schematic representation of the velocity distribution of a fluid which flows through a central body-free diffuser 30.
  • the diffuser 30 corresponds to a nozzle with a substantially constant cross-sectional widening in the flow direction and is shown in FIG. 3 in longitudinal section.
  • the total opening angle of the diffuser walls is about 20 °.
  • the fluid is introduced evenly distributed in a nozzle inlet 32.
  • the expansion of the diffuser in the flow direction is problematic because due to the large opening angle, the flow separates.
  • the jet field S of the fluid is detached from the lower diffuser wall (in FIG. 3) and only flows out of the upper diffuser wall (in FIG. 3) through the diffuser 30 and out of the nozzle outlet 33.
  • the asymmetrical velocity distribution shown in FIG. 3 results downstream of the nozzle outlet 33.
  • the jet of the fluid shown in FIG. 3 is difficult to use because it is not aligned with a target can. Also for air conditioning applications such nozzles are not usable because they cause very unpleasant drafts.
  • FIGS. 4 and 5 each show a schematic representation of the velocity distribution of a fluid which flows through a diffuser 30 'or 30 "The diffusers 30' and 30" are formed by the nozzle structure and nozzle wall exactly like the diffuser shown on the left in FIG 30. In contrast to the diffuser 30 shown on the left in FIG. 3, the diffuser 30 'or 30 "shown in FIGS. 4 and 5 has a central body 35' or 35". The central body 35 'or 35 "is arranged in the interior of the diffuser 30' or 30" and extends parallel to its longitudinal axis.
  • the central body 35 'or 35 is formed almost as long as the diffuser 30' or 30".
  • the shape of the nozzle walls of the diffuser 30 'and 30 corresponds to the shape of the nozzle walls of the diffuser 30 without central body
  • the shapes of the central bodies 30' and 30" were calculated by numerical optimization, eg using a genetic algorithm.
  • the central body 35 'or 35 "causes the fluid to flow into the nozzle inlet 32, the diffuser walls and the central body, and the resulting jet of fluid can be used in a targeted manner when using the diffusers 30' or 30".
  • the optimized central body has in the two embodiments shown a waisted, elongated teardrop shape and is. With respect to the longitudinal axis of the diffuser formed rotationally symmetrical.
  • the central body 35 'or 35' is formed almost as long as the diffuser 30 'or 30 ", for example, the central body may be formed 0.9 to 1, 1 times as long as the diffuser, a significant advantage when using diffuser with central body is that a much more homogeneous heat transfer distribution can be achieved at the target, which is based on the much more homogenous beam distribution in the far field In the embodiments shown in FIGS Flow from the diffuser walls.
  • the fluid flows through the diffuser 30 'or 30 ", both closely adjacent to the diffuser walls, and closely adjacent to the central body 35' and 35", respectively.
  • the fluid can emerge from the diffuser in a jet with a homogeneous distribution of velocity, which propagates further in the direction of the extended longitudinal axis of the diffuser.
  • the arrangement of the central body in the diffuser improves the heat transfer distribution in the far field by 25% to 30% compared to a diffuser without central body. At the same time, there is also an increase in the heat transfer of up to 5% to the material to be heated / cooled.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Nozzles (AREA)

Abstract

La présente invention concerne un diffuseur (20) comprenant une entrée de buse (22), une sortie de buse (23) et un conduit d'écoulement (24) qui s'étend de l'entrée de buse (22) à la sortie de buse (23) dans un sens d'écoulement principal (H). Le conduit d'écoulement (24) est limité au niveau de ses extrémités de section transversale par des parois de diffuseur (26) et il présente à l'entrée de buse (23) une surface de section transversale (A) plus petite qu'à la sortie de buse (22). Un corps central (275) est disposé dans le conduit d'écoulement (24) à l'intérieur du diffuseur (20) et le diffuseur (20) est réalisé sous la forme d'une buse à jet longue portée.
EP13789171.9A 2012-10-22 2013-10-16 Buse à jet longue portée pour grandes profondeurs de pénétration Not-in-force EP2909552B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012020689.5A DE102012020689A1 (de) 2012-10-22 2012-10-22 Weitwurfdüse für große Eindringtiefen
PCT/EP2013/003113 WO2014063797A1 (fr) 2012-10-22 2013-10-16 Buse à jet longue portée pour grandes profondeurs de pénétration

Publications (2)

Publication Number Publication Date
EP2909552A1 true EP2909552A1 (fr) 2015-08-26
EP2909552B1 EP2909552B1 (fr) 2018-10-10

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EP13789171.9A Not-in-force EP2909552B1 (fr) 2012-10-22 2013-10-16 Buse à jet longue portée pour grandes profondeurs de pénétration

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EP (1) EP2909552B1 (fr)
DE (1) DE102012020689A1 (fr)
WO (1) WO2014063797A1 (fr)

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DE102015017280B3 (de) 2015-07-31 2019-04-04 Dürr Systems Ag Behandlungsanlage und Verfahren zum Behandeln von Werkstücken
DE102015017279B3 (de) 2015-07-31 2019-04-04 Dürr Systems Ag Behandlungsanlage und Verfahren zum Behandeln von Werkstücken
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DE102012020689A1 (de) 2014-04-24
WO2014063797A1 (fr) 2014-05-01

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