CN212130883U - Front narrow and rear wide type seam type casing processing device for gas compressor - Google Patents
Front narrow and rear wide type seam type casing processing device for gas compressor Download PDFInfo
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- CN212130883U CN212130883U CN202020450286.4U CN202020450286U CN212130883U CN 212130883 U CN212130883 U CN 212130883U CN 202020450286 U CN202020450286 U CN 202020450286U CN 212130883 U CN212130883 U CN 212130883U
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Abstract
The utility model discloses a wide formula seam formula processing machine casket device behind narrow before compressor, the device includes: a hub for mounting a rotor; a rotor, which is composed of a plurality of blades rotating around a rotating shaft and is installed on the hub; a cylindrical test piece case having a set thickness and surrounding the blade at 360 °; a plurality of slot processing cases, each of which is discretely opened at a set interval on the inner wall of the cylindrical test piece case. The utility model discloses a wide formula seam formula processing machine casket device behind narrow before this compressor sets up a plurality of discrete slope seams at test piece casket inner wall, and the seam is to certain angle of rotor direction of rotation slope. The slits present a front narrow and rear wide linear expanding design from the direction of airflow flow. The slots draw low energy flow from the tip of the blade through a pressure differential upstream and downstream of the slot floor, and then transport the low energy flow to the upstream jet, changing the momentum of the tip leakage and main flow, and improving flow losses. The effect of both the efficiency and the stability expansion of the gas compressor is realized.
Description
Technical Field
The utility model relates to a compressor flow stability control technical field especially relates to a wide formula seam formula processing machine casket device behind narrow before compressor.
Background
The stability of the compressor is one of the crucial parameters for measuring the performance of the compressor, and the safety of an engine and a pilot is directly influenced by the quality of the compressor. Slot type processing cases are of great interest because of their greater expansion and stability. The slit type processing casing can improve the flow blockage condition of the blade top area of the air compressor, postpone the occurrence of the instability factor of the air compressor, and further improve the stall margin of the air compressor. The flow in the tip region of the compressor blade has extremely strong three-dimensional flow and steady characteristics, and the introduction of the slot-type processing case aggravates the interaction between the processing case and the main flow. How to design a slot type processing casing structure to effectively improve the stable working range of the gas compressor and reduce the negative influence on the efficiency of the gas compressor is still a challenging problem in the field of the gas compressor at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a wide formula seam formula processing machine casket device behind narrow preceding to compressor to at least part solves the problem among the background art.
The utility model provides a technical scheme is: a compressor front narrow and back wide slot type casing treatment device, comprising:
a hub for mounting a rotor;
the rotor consists of a plurality of blades rotating around a rotating shaft and is arranged on the hub;
a cylindrical test piece case having a set thickness and surrounding the blade at 360 °;
a plurality of slot processing cases, each slot processing case is discretely opened at an inner wall of the cylindrical test piece case by a set interval.
In some embodiments, the slot casing opening axially overlaps the rotor tip by an amount of 0.4 to 1.0 times the tip axial chord length.
In some embodiments, the ratio of the width of the middle of the slot bottom of the slot processing casing to the gap between the two adjacent slot processing casings is less than 0.6, and the gap between the two adjacent slot processing casings is equal to the width of the middle of the slot bottom of the slot processing casing plus the set gap between the two adjacent slot processing casings.
In some embodiments, the slot processing case has a height of less than 0.5 times the tip axial chord length of the rotor.
In some embodiments, the slot processing case has a length of 0.5 to 1.0 times the axial chord length of the tip of the rotor.
In some embodiments, the slot casing is inclined at an angle of less than or equal to 60 ° to the direction of rotation of the rotor.
In some embodiments, the slot casing is inclined at an angle of less than or equal to 90 ° with respect to the rotational axis of the rotor.
In some embodiments, the slot processing casing has a number of individual blade channels in the rotor of less than or equal to 10.
In some embodiments, the slot processing casing has a linear expanding structure with a narrow front part and a wide back part along the flowing direction of the airflow.
In some embodiments, the slot processing casing has a rectangular, circular or streamlined cross-section.
In some embodiments, the set spacing between each slot processing casing is the same.
In some embodiments, the rotor and the cylindrical test piece casing have tip clearance therebetween.
In some embodiments, the compressor is a single or multi-stage axial, mixed or radial compressor.
The utility model provides a wide formula seam formula processing machine casket device behind narrow before this compressor compares with prior art method, and the advantage that has is:
on the premise of ensuring that the opening area of the slot type processing casing is unchanged, the slot type processing casing structure with the narrow front part and the wide rear part has larger suction area due to the wide design of the rear part, so that more low-energy fluid in the blade top area can be sucked into the slot, and the blade top blockage is slowed down. Meanwhile, the suction effect can greatly weaken the development of tip leakage vortex, reduce the tip leakage amount and weaken the leakage loss and the mixing loss. On the other hand, the conveying action of the slits sprays the downstream low-energy fluid out from the upstream under the action of the pressure difference. The front narrow design can make the speed of fluid jet higher, accelerate the incoming flow, thus make the incoming flow obtain bigger momentum, "resist" the overflow of the leakage flow. Therefore, the design can effectively improve the stable working range of the compressor without causing great loss.
Drawings
In order to more clearly illustrate the technical solution provided by the present invention, the following will briefly describe the accompanying drawings. The following drawings are merely some embodiments of the invention.
Fig. 1 is a schematic view of a meridian plane structure of a slot type casing according to an embodiment of the present invention;
FIG. 2 is a structural view of section A-A in FIG. 1;
FIG. 3 is a block diagram of section B-B of FIG. 1;
fig. 4 to 8 are meridian plane structure views of the slot type processing casing of various cross-sectional forms in the practice of the present invention.
In the figure:
1-wheel hub
2-cylindrical test piece casing
3-rotor
4-slit type treatment machine box
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following detailed description is provided by way of specific embodiments with reference to the accompanying drawings. It is noted that the implementations not depicted in the drawings are of a form known to those skilled in the art. Directional phrases used in the following embodiments refer only to the direction of the accompanying drawings. Accordingly, the directional terminology used is intended to be in the nature of words of description rather than of limitation.
An embodiment of the utility model provides a wide formula seam formula processing machine casket device behind narrow before compressor, as shown in figure 1, include:
the hub 1 is used for mounting the rotor 3, and particularly used for mounting and fixing blades on the rotor 3;
the rotor 3 consists of a plurality of blades rotating around a rotating shaft, is arranged on the hub 1 and is used for applying work to a working medium;
a cylindrical test piece casing 2 having a set thickness and surrounding blades on the rotor 3 at 360 °;
a plurality of slot processing cases 4 are provided, and the respective slot processing cases 4 are discretely opened at a predetermined interval on the inner wall of the cylindrical test piece case 2.
In some embodiments, tip clearances exist between the compressor rotor 3 and the cylindrical test piece casing 2. Under the action of the pressure difference between the pressure surface and the suction surface of the blade top of the rotor 3 of the compressor, the airflow passes through the gap to form leakage flow, the leakage flow thickens the boundary layer of the end wall, the flow blockage is increased, and the compressor is stalled.
In some embodiments, a plurality of uniformly distributed slot type processing casings 4 are arranged on the inner wall of the cylindrical test piece casing 2 of the compressor, namely, the set intervals among the slot type processing casings 4 are the same, the structure can suck low-energy fluid accumulated on the blade top, and the fluid can be sprayed out at the upstream through the conveying function of the slot type processing casings 4 and mixed with incoming flow to accelerate the incoming flow, so that the incoming flow obtains higher flow momentum, the overflow of leakage flow is blocked, and the occurrence of stall is delayed.
In some embodiments, for the slot processing casing, further comprising:
the length of the slot type processing casing is 0.5 to 1.0 time of the axial chord length of the blade top of the rotor; and/or
The height of the slot type processing casing is less than 0.5 time of the axial chord length of the blade top of the rotor; and/or
The axial overlapping amount of the opening of the slot type processing machine box and the blade top of the rotor is 0.4-1.0 time of the axial chord length of the blade top.
In this embodiment, as shown in fig. 1, the length L of the slot type processing casing 4 is 80% of the axial chord length of the blade tip; the height H of the slot type processing machine box 4 is 25% of the axial chord length of the blade top; the axial overlap O of the opening of the slot type treatment casing 4 and the blade tip of the rotor is 40% of the blade tip axial chord length.
In other embodiments, for the slot type processing casing, further comprising:
the inclination angle of the slot type processing casing to the direction of the rotating shaft of the rotor is less than or equal to 90 degrees; and/or
The inclination angle of the slot type processing casing to the rotation direction of the rotor is less than or equal to 60 degrees; and/or
The number of the single blade channels of the slot type processing casing in the rotor is less than or equal to 10.
In this embodiment, as shown in fig. 2 and 3, the angle α between the slot type processing casing 4 and the rotation axis direction is 30 °; the number of the slot type processing machine box 4 in each blade channel is 4; the angle θ of inclination of the slot type casing 4 to the rotational direction of the rotor 3 is 30 °.
In this embodiment, the slot type casing 4 further includes:
referring to the section B-B shown in fig. 3, the bottom surface of the slot type processing casing 4 is along the direction of air flow, and the bottom surface of the slot type processing casing 4 is linearly widened from front to back;
referring again to section B-B of fig. 3, the relative positions of the rotating compressor rotor 3 and the slot type processing casing 4 are periodically changed. When the slot-type processing case 4 is positioned right above the rotor 3 of the compressor, the bottom surface of the slot-type processing case 4) just spans the pressure surface and the suction surface of the rotor 3 of the compressor. Under the action of the pressure surface and suction surface pressure difference, low-energy fluid gathered at the blade top can be sucked into the slot type processing casing 4, then is conveyed to the upstream, and is injected into incoming flow to be mixed with the incoming flow, so that the incoming flow is accelerated, and the flow direction momentum of the incoming flow is increased. Therefore, the slot type processing casing 4 can effectively reduce the blockage of the blade tip area and enable the incoming flow to obtain higher momentum to improve the flow of the blade tip, thereby improving the stable working range of the compressor.
In other embodiments, the slot processing casing further comprises:
the ratio of the width of the middle part of the seam bottom surface of the seam type processing case to the distance between the processing cases is less than 0.6, and the gate distance of the processing case is equal to the width of the middle part of the seam bottom surface of the seam type processing case plus the set distance between two adjacent seam type processing cases.
The cross section of the slot type processing casing is rectangular, circular arc or streamline, as shown in fig. 4-8.
In summary, the parameters of the slot type processing casing 4 can be optimized according to the application object, so as to effectively improve the stability of the compressor and reduce the negative effect on the efficiency of the compressor.
In some embodiments, the compressor formed by the slot processing casing with different parameters can be a single-stage or multi-stage axial flow type compressor, a mixed flow type compressor or a radial flow type compressor.
The above description is only an embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are all included within the scope of the present invention.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A compressor front narrow and rear wide slot type casing treatment device is characterized by comprising:
a hub for mounting a rotor;
the rotor consists of a plurality of blades rotating around a rotating shaft and is arranged on the hub;
a cylindrical test piece case having a set thickness and surrounding the blade at 360 °;
a plurality of slot processing casings, each of which is discretely opened at a predetermined interval on an inner wall of the cylindrical test piece casing.
2. The compressor front narrow and rear wide slot processing casing device according to claim 1, wherein the axial overlapping amount of the opening of the slot processing casing and the blade top of the rotor is 0.4-1.0 times of the axial chord length of the blade top.
3. The compressor front narrow and rear wide slot processing casing device according to claim 1, wherein the ratio of the width of the middle of the slot bottom surface of the slot processing casing to the processing casing gap is less than 0.6, and the processing casing gap is the slot bottom surface middle width of the slot processing casing + the set gap between two adjacent slot processing casings.
4. The compressor front narrow back wide slot processing casing arrangement of claim 1, wherein:
the height of the slot type treatment casing is less than 0.5 time of the axial chord length of the blade top of the rotor; and/or
The length of the slot type processing casing is 0.5-1.0 time of the axial chord length of the blade top of the rotor.
5. The compressor front narrow back wide slot processing casing arrangement of claim 1, wherein:
the inclination angle of the slot type processing casing to the rotation direction of the rotor is less than or equal to 60 degrees; and/or
The angle of inclination of the slot type processing casing to the direction of the rotation axis of the rotor is less than or equal to 90 degrees.
6. The compressor front narrow and rear wide slot processing casing arrangement as set forth in claim 1, wherein the number of the single blade passages of the slot processing casing in the rotor is 10 or less.
7. The compressor front narrow back wide slot processing casing arrangement of claim 1, wherein:
the slot type processing casing is in a linear expansion structure with a narrow front part and a wide back part along the airflow flowing direction; and/or
The section of the slot type processing casing is rectangular, arc-shaped or streamline.
8. The compressor front narrow back wide slot processing casing arrangement of claim 1, wherein said set spacing between each of said slot processing casings is the same.
9. The compressor front narrow back wide slot processing casing assembly of claim 1, wherein a tip clearance is provided between the rotor and the cylindrical test piece casing.
10. The compressor front narrow back wide slot processing casing device as claimed in claim 1, wherein the compressor is a single-stage or multi-stage axial flow type, mixed flow type or radial flow type compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020450286.4U CN212130883U (en) | 2020-03-31 | 2020-03-31 | Front narrow and rear wide type seam type casing processing device for gas compressor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020450286.4U CN212130883U (en) | 2020-03-31 | 2020-03-31 | Front narrow and rear wide type seam type casing processing device for gas compressor |
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| CN212130883U true CN212130883U (en) | 2020-12-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113323917A (en) * | 2021-06-24 | 2021-08-31 | 中国航发沈阳发动机研究所 | Back cavity seam-free type compressor processing casing and compressor |
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2020
- 2020-03-31 CN CN202020450286.4U patent/CN212130883U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113323917A (en) * | 2021-06-24 | 2021-08-31 | 中国航发沈阳发动机研究所 | Back cavity seam-free type compressor processing casing and compressor |
| CN113323917B (en) * | 2021-06-24 | 2023-01-17 | 中国航发沈阳发动机研究所 | Back cavity seam-free type compressor processing casing and compressor |
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