CN111992343A - Special-shaped combined nozzle jet cavity - Google Patents
Special-shaped combined nozzle jet cavity Download PDFInfo
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- CN111992343A CN111992343A CN202010886030.2A CN202010886030A CN111992343A CN 111992343 A CN111992343 A CN 111992343A CN 202010886030 A CN202010886030 A CN 202010886030A CN 111992343 A CN111992343 A CN 111992343A
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- 230000000694 effects Effects 0.000 claims abstract description 8
- 230000008859 change Effects 0.000 claims abstract description 7
- 230000010349 pulsation Effects 0.000 claims abstract description 7
- 230000004044 response Effects 0.000 claims abstract description 7
- 230000017525 heat dissipation Effects 0.000 claims abstract description 6
- 230000009471 action Effects 0.000 claims abstract description 3
- 239000002131 composite material Substances 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000009826 distribution Methods 0.000 description 8
- 230000007423 decrease Effects 0.000 description 4
- IYLGZMTXKJYONK-ACLXAEORSA-N (12s,15r)-15-hydroxy-11,16-dioxo-15,20-dihydrosenecionan-12-yl acetate Chemical compound O1C(=O)[C@](CC)(O)C[C@@H](C)[C@](C)(OC(C)=O)C(=O)OCC2=CCN3[C@H]2[C@H]1CC3 IYLGZMTXKJYONK-ACLXAEORSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
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- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- IYLGZMTXKJYONK-UHFFFAOYSA-N ruwenine Natural products O1C(=O)C(CC)(O)CC(C)C(C)(OC(C)=O)C(=O)OCC2=CCN3C2C1CC3 IYLGZMTXKJYONK-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004441 surface measurement Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Images
Classifications
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- 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
- B05B1/08—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 of pulsating nature, e.g. delivering liquid in successive separate quantities ; Fluidic oscillators
-
- 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
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Abstract
The invention relates to a special-shaped combined nozzle jet cavity which comprises a special-shaped combined nozzle and a jet cavity, wherein a nested nozzle structure is adopted to improve a radial flow field and realize uniform heat dissipation in the whole limited space area; the special-shaped combined nozzle is formed by combining branches in the central area and discontinuous band-shaped structures on the periphery, airflow pulsation is applied to an inlet of the air inlet pipe or the jet flow cavity, the pulsation response of jet flow is induced after the airflow pulsation is transmitted in the jet flow cavity, and finally the impact action of limited pulsating jet flow is formed in the impact cavity to form an air inlet pipe pulse excitation-jet flow cavity-impact cavity model. Due to the cavity effect of the jet cavity and the impact cavity, the pulse jet in the air inlet pipe-jet cavity-jet hole model generates nonlinear change response in both time domain and frequency domain.
Description
Technical Field
The invention relates to the technical field of pulse jet, in particular to a special-shaped combined nozzle jet cavity.
Background
With the further improvement of the requirement on the impact heat transfer efficiency, the traditional enhanced heat transfer means can not meet the requirement of the existing high heat transfer efficiency, so corresponding passive enhanced heat transfer and active enhanced heat transfer strategies are proposed in recent years, and the invention is a passive enhanced heat exchange mode which is formed by increasing a jet cavity and changing a nozzle into a special-shaped combined structure.
Disclosure of Invention
The invention aims to provide a novel special-shaped combined nozzle, which adopts a nested nozzle structure to improve a radial flow field and realize uniform heat dissipation in the whole limited space area.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a jet cavity with a special-shaped combined nozzle comprises a special-shaped combined nozzle and a jet cavity, wherein a nested nozzle structure is adopted to improve a radial flow field and realize uniform heat dissipation in the whole limited space area; the special-shaped combined nozzle is formed by combining branches in a central area and a peripheral discontinuous band-shaped structure, the length of a single branch of the central branch of the special-shaped combined nozzle is l, the width of a peripheral annular band is t, the central angle of the annular band is alpha, and the inner diameter of a corresponding circle is r1Outer diameter of r2The equivalent diameter is de; the jet cavity is arranged in front of the special-shaped combined nozzle, and the height of the jet cavity is HcRadius of the bottom surface is Dc(ii) a Airflow pulsation is applied to an inlet of the air inlet pipe or the jet flow cavity, pulsation response of jet flow is induced through transmission in the jet flow cavity, and finally impact action of limited pulsating jet flow is formed in the impact cavity to form an air inlet pipe pulse excitation-jet flow cavity-impact cavity model.
Wherein, the special-shaped combined nozzle is a linear nozzle.
Further, the structural parameters of the in-line nozzle are as follows: width t 2mm, central angle alpha 120 deg. and internal diameter r16.48mm, outer diameter r28.48mm, the length of the single branch of the central branch l6.48mm, and the equivalent diameter de 10 mm.
Wherein, the special-shaped combined nozzle is a Y-shaped nozzle.
Further, the structural parameters of the Y-shaped nozzle are as follows: width t 2mm, central angle alpha 60 DEG, inner diameter r15.70mm, outer diameter r27.70mm, the length of the single branch of the central branch l 5.70mm, and the equivalent diameter de 10 mm.
Wherein, the special-shaped combined nozzle is a cross-shaped nozzle.
Further, the structural parameters of the cross-shaped nozzle are as follows: width t 2mm, central angle alpha 30 DEG, inner diameter r16.05mm, outer diameter r28.05mm, the length of the single branch of the central branch l 6.05mm, and the equivalent diameter de 10 mm.
Due to the cavity effect of the jet flow cavity and the impact cavity, the pulse jet flow in the air inlet pipe pulse excitation-jet flow cavity-impact cavity model has nonlinear change response in both time domain and frequency domain.
Compared with the prior art, the invention has the beneficial effects that:
in the limited jet impact heat exchange structure, the outlet of the jet cavity is changed into a special-shaped combined structure. Compared with an independent free jet flow pulse excitation mode (see fig. 1 (a)), due to the cavity effect of the jet flow cavity and the impact cavity, the pulse jet flow in the air inlet pipe-jet flow cavity-jet flow hole model generates nonlinear change response in both time domain and frequency domain.
Drawings
FIG. 1: schematic diagram of the application mode of the pulse jet.
FIG. 2: the structural schematic diagram of the special-shaped combined nozzle.
FIG. 3: a jet cavity experimental device with a special-shaped combined nozzle.
FIG. 4: the radial distribution of the Knoop numbers of the target plate surface at different operating frequencies f.
FIG. 5: and the radial distribution of the average Nursel number of circumferential lines of the jet impact target plate surface at different impact distances along with the change of frequency.
FIG. 6: the area average Knoop number in the 4d range at different frequencies varied with the impact distance.
FIG. 7: knoop number cloud images of the surface of the target plate under different frequencies and impact distances.
FIG. 8: knoop number cloud images of the surface of the target plate under different frequencies and impact distances.
FIG. 9: the average Nurseel number of the surface of the three special-shaped combined nozzles in the limited pulse jet target plate 4d interval.
FIG. 10: the three special-shaped combined nozzle pulse jet flows correspond to a Knoop cloud chart of the surface of the target plate.
Detailed Description
The present invention will be described in further detail with reference to specific examples. The following examples are intended to illustrate the invention only and are not intended to limit the scope of the invention.
A jet cavity with special-shaped combined nozzles adopts a nested nozzle structure to improve a radial flow field and realize uniform heat dissipation in the whole limited space area. The experimental apparatus used is as shown in FIG. 3Shown in the figure. The jet cavity is designed and installed in front of the jet nozzle, and the height of the jet cavity is HcRadius of the bottom surface is DcThe structure of the special-shaped combined nozzle is shown in figure 2, so that the heat exchange effect of the impact jet flow is improved. The novel special-shaped combined nozzle adopted by the invention is formed by combining branches of a central area and discontinuous strip-shaped structures at the periphery, and the main characteristic parameters of the parameters comprise the width t of the branches of the central area and the peripheral annular belt, the central angle alpha of the annular belt and the inner diameter r of a corresponding circle1Outer diameter r2And the length l of a single branch of the central branch, and the diameter of the semicircular edge of the three special-shaped combined nozzles is the width t. These parameters are shown in table 1.
TABLE 1 geometric dimensions of the profile composite nozzle
First, heat exchange of reference round hole and jet cavity
FIG. 4 shows the average Nu at different operating frequencies f for a reference circular hole (without a jet cavity) and a reference jet cavity (with a jet cavity)avgRadially distributed. When the pulse duty ratio DC is 0.5, under each impact distance H/d, the pulse frequency f is within the range of 5Hz-20Hz, and the average Nu of Knudell number of the pulse jet of the reference round hole and the reference jet cavityavgBoth increase with increasing operating frequency f. For a reference circular tube, when the impact distance H/d is 4, as the frequency f increases, at f 20Hz, a phenomenon of double peaks occurs in the radial direction, but the second peak at the radial position r/d 1.5 is not obvious; for the reference jet cavity, as the frequency increases, the distribution of the nussel number at the stagnation center position gradually becomes monotonously decreased in the uniform distribution of the core region, but the speed of the decrease of the nussel number gradually increases and then decreases in the direction of the diameter r/d. Compared with a reference circular hole nozzle, the nozzle with the jet flow cavity is added, and the heat exchange of the surface of the impact target surface is improved.
Two, special-shaped combined nozzle jet cavity
Fig. 5 shows the radial distribution of the average nussel number of the peripheral line of the jet impact target plate surface of the three-fork special-shaped combined nozzle No.2 along with the change of frequency, wherein the experimental working conditions are that the reynolds number Re is 10000 and the pulse duty ratio DC is 0.5. It can be seen that with increasing operating frequency f, the local knoop number of the target plate surface increases therewith. Compared with data in fig. 4 and 5, compared with the reference jet flow cavity, the special-shaped combined nozzle with the jet flow cavity has obvious enhanced heat exchange effect under a small impact distance and has no advantage under a large impact distance. Fig. 6 shows the trend of the average knoop number of the area in the range of the target plate surface 4d impacted by the pulse jet along with the change of the impact distance ratio H/d, and it can be found that the maximum value of the average knoop number of the surface is obtained when H/d is 2 at each frequency, however, it is noted that the decreasing speed of the average knoop number of the surface is remarkably gentle when H/d is not less than 2 at f being 20 Hz. As shown in fig. 7, which shows the distribution of the cloud images of the local knoop numbers of the impact of the pulsed jet on the target plate surface, it can be seen that the local knoop numbers of the respective regions increase with the increase of the frequency.
In order to compare jet impact heat exchange performance of three special-shaped combined orifice plate nozzles, heat exchange performance of the surface of the target plate is measured under the working conditions that DC is 0.5, H/d is 1-4, Re is 10000-20000 and f is 10Hz, and the obtained average Knudsen's number of the surface line of the target plate is distributed along the radial direction as shown in FIG. 8. According to the figure, under most experimental working conditions, the four-branch special-shaped combined nozzle NO.3 has the highest Knoop number in the whole radial region and shows excellent jet flow heat exchange performance; the worst of the three-branch special-shaped combined nozzle NO.2 times and the two-branch special-shaped combined nozzle NO. 1. In the radial average Knoop number distribution, the three-branch and four-branch special-shaped combined nozzles are gradually reduced in the line average Knoop number along with the increase of the radius, and when H/d is 1 and 2, the two-branch special-shaped combined nozzles obtain similar line average Knoop number in the range of r/d < 1. Fig. 9 shows the variation trend of the average nussel number of the area of the pulse jet heat exchange target plate in a 4d circular range with the center of a dead center as the center along with the impact distance ratio H/d in the limited space. By comparison, it can be seen that the three-and four-branched nozzles have an area average nussel number that increases and then decreases as the impact pitch ratio increases when Re is 10000, and a maximum value is obtained when H/d is 2, while the two-branched nozzles exhibit a negative correlation between the area average nussel number and the impact pitch ratio. When Re is 20000, the three-branch and two-branch combined nozzles have peak values corresponding to the area average knoop number when H/d is 2, and the four-branch combined nozzles gradually decrease the impact heat exchange performance as the impact pitch ratio increases, but when Re is 10000 and 20000, the four-branch combined nozzles No.3 have the maximum area average knoop number, and the performance is excellent.
FIG. 10 shows a cloud of local Knudsen number distributions of three different profile combinations sprayed on a surface measurement area under H/d-1-4 conditions. When H/d is 1, the two-branch special-shaped combined nozzle No.1 can find that the area near the stagnation center presents a better heat exchange area corresponding to a straight-line and arc-shaped surrounding belt, wherein the heat exchange of the areas corresponding to the left end point and the right end point of the straight line is better, which explains that the average Knudell number under the working condition has a flat trend in the range of r/d < 1; in the peripheral region, however, it was found that the Knudsen number contour line appears as a square placed at +45 °, and heat exchange deterioration occurs in the four corner regions of the target plate. The surface of the special-shaped combined nozzle NO.2 corresponding to the target plate is in the shape of an upright triangular Nurseal number isoline, and the heat exchange is rapidly deteriorated in the central area of the three edges; the special-shaped combined nozzles NO.3 with four branches are different, and when H/d is 1, a positive quadrilateral isoline pattern is presented, four sides are approximately parallel to the edge of the target plate, and the heat exchange distribution in the whole circumferential region is uniform, so that the whole and local heat exchange effects are due to other two structures. Comparing the H/d with the conditions of 2 and 4, the heat exchange effect of the special-shaped combined nozzle with four branches is better than that of a three-branch structure, the two branches are the worst, and the Nurseel number of the stagnation point is similar to that of the surrounding area. The small impact space has the advantages over the heat exchange of the special-shaped combined nozzle with the jet cavity; the pulse jet impact convection heat transfer of the special-shaped combined nozzles with the four branches is strongest.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention in any way, and any person skilled in the art can make any simple modification, equivalent replacement, and improvement on the above embodiment without departing from the technical spirit of the present invention, and still fall within the protection scope of the technical solution of the present invention.
Claims (8)
1. The utility model provides a heterotypic combination spout efflux chamber which characterized in that: the jet flow heat dissipation device comprises a special-shaped combined nozzle and a jet flow cavity, and adopts a nested nozzle structure to improve a radial flow field and realize uniform heat dissipation in the whole limited space area; the special-shaped combined nozzle is formed by combining branches in a central area and a peripheral discontinuous band-shaped structure, the length of a single branch of the central branch of the special-shaped combined nozzle is l, the width of a peripheral annular band is t, the central angle of the annular band is alpha, and the inner diameter of a corresponding circle is r1Outer diameter of r2The equivalent diameter is de; the jet cavity is arranged in front of the special-shaped combined nozzle, and the height of the jet cavity is HcRadius of the bottom surface is Dc(ii) a Airflow pulsation is applied to an inlet of the air inlet pipe or the jet flow cavity, pulsation response of jet flow is induced through transmission in the jet flow cavity, and finally impact action of limited pulsating jet flow is formed in the impact cavity to form an air inlet pipe pulse excitation-jet flow cavity-impact cavity model.
2. The profiled composite jet cavity of claim 1, wherein: the special-shaped combined nozzle is a linear nozzle.
3. The profiled composite jet cavity of claim 2, wherein: the structural parameters of the in-line nozzle are as follows: width t 2mm, central angle alpha 120 deg. and internal diameter r16.48mm, outer diameter r28.48mm, the length of the single branch of the central branch is l6.48mm, and the equivalent diameter de 10 mm.
4. The profiled composite jet cavity of claim 1, wherein: the special-shaped combined nozzle is a Y-shaped nozzle.
5. The profiled composite jet cavity of claim 4, wherein: the structural parameters of the Y-shaped nozzle are as follows: width t 2mm, central angle alpha 60 DEG, inner diameter r15.70mm, outer diameter r27.70mm, the length of the single branch of the central branch l 5.70mm, and the equivalent diameter de 10 mm.
6. The profiled composite jet cavity of claim 1, wherein: the special-shaped combined nozzle is a cross-shaped nozzle.
7. The profiled composite jet cavity of claim 6, wherein: the structural parameters of the cross-shaped nozzle are as follows: width t 2mm, central angle alpha 30 DEG, inner diameter r16.05mm, outer diameter r28.05mm, the length of the single branch of the central branch l 6.05mm, and the equivalent diameter de 10 mm.
8. The profiled composite jet cavity of claim 1, wherein: due to the cavity effect of the jet flow cavity and the impact cavity, the pulse jet flow in the air inlet pipe pulse excitation-jet flow cavity-impact cavity model has nonlinear change response in both time domain and frequency domain.
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| CN202010886030.2A CN111992343B (en) | 2020-08-28 | 2020-08-28 | Special-shaped combined nozzle jet cavity |
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| CN202010886030.2A CN111992343B (en) | 2020-08-28 | 2020-08-28 | Special-shaped combined nozzle jet cavity |
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| CN111992343A true CN111992343A (en) | 2020-11-27 |
| CN111992343B CN111992343B (en) | 2021-09-14 |
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| CN111992343B (en) | 2021-09-14 |
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Application publication date: 20201127 Assignee: Hanzhong (Nanjing) Technology Co.,Ltd. Assignor: NANJING INSTITUTE OF TECHNOLOGY Contract record no.: X2024980000528 Denomination of invention: Irregular combination nozzle jet chamber Granted publication date: 20210914 License type: Common License Record date: 20240112 |