DE10102088A1 - Intake cooler for motor vehicle supercharger has matrix of finned tubes with internal fins and turbulators - Google Patents

Abstract

The intake cooler for a motor vehicle supercharger has a matrix (12) of finned tubes formed by flattened tubes (16) which are contacted by the intake air. The matrix has internal fins (22) having rows (24,26,28...) formed of bars (42) and cross pieces (44) between these which are curved and offset in rows to be inserted into the flat tubes. At least one bar and-or one traverse have a turbulence generator. The turbulence generators can be formed as flow deflectors.

Description

The invention relates to an intercooler, in particular for motor vehicles, according to the preamble of claim 1.

Such an intercooler is known from the Shell Lexikonburning engine, supplement from ATZ and MTZ, episode 33 . It consists of a finned tube block, which is connected to a charge air inlet chamber and a charge air outlet chamber. In this case, hot charge air from an internal combustion engine of the motor vehicle can flow through flat tubes of the finned tube block and leads a large part of the heat to the ambient air via fins assigned between the flat tubes, which are acted upon by ambient air. Within the flat tubes, an inner rib element is arranged which has rows of webs and web crossbars which are bent like a web rib, in some regions offset from one another, and thus ensures that the charge air is mixed within the flat tubes. A disadvantage of such an intercooler is that the charge air within a respective row between two webs does experience good heat transfer to the inner fin element in the boundary layer area, but a hot core flow remains in the area of the core of the flow, from which there is hardly any heat transfer to the inner fin element. Overall, the actual heat transfer performance compared to the theoretically possible is not fully utilized.

Furthermore, from DE 196 54 367 A1 or the correct sponding publication US 6,070,616 a method for attaching Vortex generators in the form of winglets on a thin sheet are known the vortex generators are removed from the sheet by means of massive forming be shaped.

The invention has for its object a charge air cooler gangs mentioned in such a way that the heat exchange over the overall flow profile is improved and the hot core flow is led to the inner rib element.

This object is achieved with the features of claim 1.

According to the invention it is provided that at least one web and / or one Web cross member of the inner fin element we introduced into the flat tubes at least has a vortex generator. This will improve Mixing of the hot core flow with the boundary layer flow in Formed a cross flow so that the heat of the core flow is not more of the inner fin element or of the flat tube wall the limit layer flow is conducted in isolation, but the boundary layer flow is deliberately broken up and mixed. In addition to just breaking up the boundary layer flow are caused by the vortex generators, in particular formed by the winglets, longitudinal vertebrae, their mixing effect extends far into the core flow and thus the heat of the whole th charge air can be better discharged to the ambient air.

In a further development of the invention, the vortex generators are either in shape formed by winglets, as a ramp or in the form of a rag. there the longitudinal axis of the winglets runs opposite the charge air Main flow direction obliquely, especially at an angle of about 15 ° to 45 °. Through such an arrangement of the winglets and the adapters Solution of the angle of the inclination can specifically influence the shape the longitudinal vortex and thus taken on the mixing of the flow become.  

In a further embodiment of the invention, each in charge air Main flow direction of successive webs in each case opposite aligned winglets. This will remove the charge air after passing through a first winglet a longitudinal vortex with a certain direction of rotation is generated, the following when viewed in the charge air main flow direction Winglet creates an opposing longitudinal vertebra, reflecting the degree of Mixing increased further.

In a further embodiment of the invention, the winglets are in pairs arranges and runs in opposite directions to the charge air Main flow direction, being in the charge air main flow direction run apart and the winglets by deforming the webs and / or Crossbars are made.

In a further embodiment of the invention, every second web has a row a winglet, which are aligned in the same way. This is before all chosen against the background of manufacturing technology, in order to form a row in parallel and thus as simple as possible To ensure che and inexpensive design of the inner rib elements most.

In a further embodiment of the invention, the vortex generator is in the form of a Ramp executed opposite the charge air main flow direction at an angle, in particular inclined at an angle of approximately 20 ° to 30 ° is arranged. Through the ramp the air flow is up and down distracted and additionally a vortex flow with a clear Cross component generated. This cross component prevents the bil formation of a continuous core flow.

In a further embodiment of the invention follow in charge air Main flow direction increasing ramps in charge air Main flow direction descending ramps. This will make the air flow alternating with a component when flowing through the rib element deflected upwards and with one component down, causing it to  further swirling and reducing a continuous core flow mung is coming.

Embodiments of the invention are shown in the drawings and are described in more detail below.

Here shows:

Fig. 1 is a spatial, sectional view of a Ladeluftküh lers;

Fig. 2 is a spatial, partially sectioned view of a flat tube with inner rib elements introduced therein;

Fig. 3 is a sectional view of the vortex generator perpendicular to its longitudinal axis;

Fig. 4 is a sectional view of the vortex generator along its longitudinal axis;

Figure 5 is a perspective view of the inner fin element having ramps designed as vortex generators.

FIG. 5a is a side view of the inner fin element of FIG. 5;

FIG. 5b is a front view of the inner fin element according to Fig. 5a;

FIG. 5c shows a top view of the inner rib element according to FIG. 5a;

FIG. 5d shows a side view of the rear of the inner fin member according to Fig. 5a;

FIG. 6 shows a detailed view of a ramp according to FIG. 5;

FIG. 7 shows a detailed view of a ramp provided with a passage opening according to FIG. 5;

Fig. 8 is a detail view of a vortex generator formed by a cloth;

Fig. 9 detailed view of a vortex generator formed by a box-shaped ramp;

Fig. 10 is a detailed view of a vortex generator formed by a rounded hollow profile.

Fig. 1 is a perspective, cross-sectional view showing a charge air cooler 10. This charge air cooler 10 consists of a finned tube block 12 which is connected to egg ner charge air inlet chamber 14 and a charge air outlet chamber, not shown. The finned tube block 12 consists of flat tubes 16 , between which fins 18 are arranged in the form of web ribs or corrugated ribs and are soldered to the flat tubes 16 . Charge air of an internal combustion engine (not shown) of a motor vehicle flows from the charge air inlet chamber 14 through the flat tubes 16 to the charge air outlet chamber. The ribs 18 are acted upon by ambient air 20 perpendicular to this charge air flow. Since the charge air has a significantly higher temperature than the ambient air 20 , heat is transferred from the charge air to the ambient air 20 .

Inner fin elements 22 are arranged within the flat tubes 16 and soldered to them. As shown in Fig. 2, these are web rib-like ge arc and consist of several rows 24 to 38 , each perpendicular to the charge air main flow direction 40 and are arranged against each other ver sets. The individual rows 24 to 38 each consist of webs 42 and web cross members 44 , the web cross members 44 extending substantially parallel to the flat tube broad sides 46 and the webs 42 essentially perpendicular to these.

When the flat tubes 16 are filled with charge air, a core flow is formed within a respective row 24 to 38 of the inner fin elements 22 and is surrounded by a boundary layer flow present in the region of the walls. The core flow has a significantly higher temperature level than the walls due to the isolation from the boundary layer flow.

For improved mixing of the core flow with the boundary layer flow, the webs 42 have on their surfaces approximately centrally arranged vortex generators 48 with a bead-like shape, the longitudinal axis 50 of the vortex generators 48 being inclined by approximately 45 ° with respect to the charge air main flow direction. Each second web 42 of the first rows 24 and 32 has at the same angle of inclination and in the same direction from the material by deformation pronounced vortex generator 48th The rows 26 and 34 also have on each second web 42 a vortex generator 52 , these each producing 48 against the vortex generator in the opposite direction from the material are pronounced and are also inclined at 45 ° in the opposite direction. In Fig. 3 is a sectional view through a vortex generator 48 perpendicular to its longitudinal axis 50 and in Fig. 4 along its longitudinal axis. It can be seen that the vortex generators are only produced by deforming the material and have a closed surface, so that a flow from one material side through the area of the vortex generators to the other material side is excluded.

The vortex generators 48 , 52 improve the mixing of the hot core flow with the boundary layer flow, so that the heat of the core flow is no longer conducted in isolation from the wall of the boundary layer flow, but rather the boundary layer flow is deliberately broken up and mixed and thus an increase in the heat Transmission power of the charge air cooler 10 is made possible.

Fig. 5 shows a further advantageous embodiment of the inner rib, ie egg ner so-called. Rib, as shown in FIGS . 2, 3, and 4 already as the inner rib element 22 . In the web rib 22 shown there, the vortex generators 48 , 52 are designed as elongated beads which are embossed from the surface of a web 42 . Wherein the exporting of FIG approximately, for example. 5 of this vortex generator 60 forms out as a ramp, as can be seen in a perspective view of a rib member 61 in FIG. 5. The rib element 61 consists - as in the previous embodiment of FIG. 2 - from webs 62 and 63 , which are connected by a web cross member 64 . The ramps 60 are designed as flat surfaces which run obliquely to the air flow direction 65 and which form approximately a right angle with the web surfaces 62 , ie form a kind of shoulder. The ramps 66 denoted by 60 in FIG. 5 rise as seen in the air flow direction 65 ; on the other hand, ramps 66 are also provided which drop in the direction of air flow.

A more precise illustration of the rib element 61 is shown in FIGS. 5a, 5b, 5c and 5d. The Fig. 5a shows a side view of the front side of the fin member 61, that is transverse to the air flow direction 65th It can be seen that, in the direction of air flow 65 , first an increasing ram 60 , then a declining ramp 66 and then again an increasing ramp 60 follow one another. These ramps 60 , 66 and 60 can also be seen in FIG. 5c, a top view of the rib element 61 . In Fig. 5d, the fin member is shown in a side view from the rear 61: there are in the right area of the fin member 61, arranged thus in the downstream part of the rib further ramps 67 and 68 on, and on a rising ramp 67 has a sloping ramp 68 and this is followed by an ascending ramp 67 . From Fig. 5c be particularly clearly be seen that this rib element 61 has a total of six ramps, three 60, 66, 60 in the front and another three 67, 68, 67 in the rear area on the opposite side of the rib are arranged.

FIG. 5b, which is not to scale to FIGS. 5a, 5c and 5d, but is somewhat enlarged, shows the rib element 61 in a view from the front, ie seen in the direction of air flow 65 . The ramp 60 , here as a rising surface against the air flow, has a width of b = 1.3 mm, which corresponds to approximately one third of the total width B of this rib element. At the upper end of the ramp 60 there is an approximately rectangular passage cross-section 71 through which the air flow can pass. The same openings as 71 are arranged at the end of the ascending ramps 60 and 67 or at the beginning of the descending ramps 66 and 68 , respectively. In addition, the sloping ramps 66 and 68 provided downstream also passage openings 72, which are shown in Fig. 5 and Fig. 5a.

The effect of these ramps 60 , 66 , 67 , 68 is, on the one hand, that the air flow 65 is deflected upwards and downwards and, on the other hand, generates a vortex flow with a clear transverse component. This cross component is generated in particular by the shape and dimension (width b) of the ramp and prevents the above-mentioned, the heat transfer less conducive, continuous core flow.

Further exemplary embodiments of the invention, which show a vortex generator in ramp form, are shown in FIGS . 6 to 10. FIG. 6 shows a section of the above-mentioned rib element with a ramp 80 which forms an obtuse angle with respect to the web surfaces 81 and 82 (in the exemplary embodiment according to FIG. 5, this angle was a right one). Fig. 7 shows a modification of Fig. 6, wherein a similar ramp 83 is provided, the surface of which is however broken through a passage opening 84 for the air flow.

FIG. 8 shows a modification in which the ramp-shaped vortex generator is designed as a flap 85 which is partially punched out of the web surface 86 and is issued at a right or obtuse angle to the web surface 86 . Through this tab 85 results in a through opening 87 in the web wall 86 , and on the other hand tear-off edges 88 and 89 and 90 are formed, which ensure a further swirling of the air flow.

FIG. 9 shows a box-shaped ramp 91 , which is shaped as a U-profile 93 from the web surface 92 . This U-profile thus consists of the surfaces 91 , 94 and 95 arranged approximately at right angles to one another.

A further variant is shown in FIG. 10, ie a ramp 96 with a rounded hollow profile 97 . The ramps 91 and 96 thus differ only slightly with regard to their hollow profile, but this affects the formation of eddies.

All the ramps mentioned above. Fig. 6 to 10 have in common that they are all inclined at about an angle of 20 ° -30 ° with respect to the air flow direction.

Claims (16)

1. charge air cooler, in particular for motor vehicles, with a finned tube block ( 12 ) consisting of flat tubes ( 16 ) through which charge air can flow and associated with them, acted upon by ambient air rips ( 18 ), with at least one in each case in the interior of the flat tubes ( 16 ) Inner rib element ( 22 , 61 ) with rows ( 24 , 26 , 28 , 30 , 32 , 34 , 36 , 38 ) made of webs ( 42 , 81 , 86 , 92 ) and web cross members ( 44 ) with web rib-like curved, partially mutually offset rows , characterized in that at least one web ( 42 , 81 , 86 , 92 ) and / or a web cross member ( 44 ) has at least one vortex generator ( 48 , 52 , 60 , 66 , 67 , 68 , 80 , 83 , 91 , 96 ) having. 2. Intercooler according to claim 1, characterized in that we at least one vortex generator is designed as a winglet ( 48 , 52 ). 3. intercooler according to claim 1, characterized in that we at least one vortex generator is designed as a ramp ( 60 , 66 , 67 , 68 , 80 , 83 , 91 , 96 ). 4. intercooler according to claim 1, characterized in that we at least one vortex generator is designed as a cloth ( 85 ). 5. charge air cooler according to one of claims 1 to 2, characterized in that the longitudinal axis ( 50 ) of the winglets ( 48 , 52 ) relative to the charge air main flow direction ( 40 ) is inclined at an angle of approximately 15 ° to 45 °. 6. intercooler according to one of claims 1, 2 or 5, characterized in that each in the charge air main flow direction ( 40 ) aufeinan the following webs ( 42 ) each have oppositely aligned winglets ( 48 , 52 ). 7. charge air cooler according to one of claims 1, 2, 5 or 6, characterized in that the winglets ( 48 , 52 ) are arranged in pairs and each run in opposite directions obliquely to the charge air main flow direction ( 40 ), wherein they in the charge air main flow direction ( 40 ) run apart. 8. intercooler according to one of claims 1, 2, 5, 6 or 7, characterized in that the winglets ( 48 , 52 ) are made by deforming the webs ( 42 ) and / or web cross members ( 44 ). 9. intercooler according to one of the preceding claims, characterized in that every second web ( 42 ) of a row has a winglet ( 48 , 52 ), each of which is aligned identically. 10. intercooler according to one of claims 1 or 3, characterized in that the ramp ( 60 , 66 , 67 , 68 , 80 , 83 , 91 , 96 ) relative to the charge air main flow direction ( 65 ) obliquely, in particular at an angle of is inclined about 20 ° to 30 °. 11. charge air cooler according to claim 10, characterized in that in the charge air main flow direction ( 65 ) rising ramps ( 60 , 67 ) in the charge air main flow direction ( 65 ) falling ramps ( 66 , 68 ) fol gene. 12. charge air cooler according to claim 11, characterized in that the ramps ( 60 , 66 , 67 , 68 , 80 , 83 , 91 , 96 ) alternately in the charge air main flow direction ( 65 ) in succession on one side (62) of the in nenrippenelements ( 61 ) and on the other side (63) of the inner rib element ( 61 ) are arranged. 13. Intercooler according to one of claims 10 to 12, characterized in that the ramp ( 83 ) has a passage opening ( 84 ). 14. Intercooler according to one of claims 10 to 13, characterized in that the ramp ( 60 , 66 , 67 , 68 , 80 , 83 , 91 , 96 ) has a width b of about 1.3 mm. 15. Intercooler according to one of claims 1 or 4, characterized in that the tab ( 85 ) from the web surface ( 86 ) is partially punched out and is at an angle, preferably at right angles, to the web surface ( 86 ). 16. Inner rib for flat tubes of an intercooler, designed as a web grip pe with side webs which are connected by a web cross member, characterized in that ramps ( 60 , 66 , 67 , 68 , 80 , 83 , 91 , 96 ) are formed from the side web surfaces are, which are arranged inclined in the air flow direction, preferably at an angle of 20 ° to 30 ° and with a width of 0.5 ≦ b ≦ 2.1 mm, preferably b = 1.3 mm.