CN103967812B - A kind of return flow type is to turning adsorption pressure mechanism of qi - Google Patents
A kind of return flow type is to turning adsorption pressure mechanism of qi Download PDFInfo
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- CN103967812B CN103967812B CN201410177401.4A CN201410177401A CN103967812B CN 103967812 B CN103967812 B CN 103967812B CN 201410177401 A CN201410177401 A CN 201410177401A CN 103967812 B CN103967812 B CN 103967812B
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Abstract
A kind of return flow type, to turning adsorption pressure mechanism of qi, is provided with reflux at casing outer surface, the housing of the entrance point of casing has multiple reflow pipe mounting hole, and each reflow pipe mounting hole lays respectively at passage central authorities between each guide vane leaf.The housing of casing outlet end has multiple sucking pipe mounting hole, suction port one_to_one corresponding in each sucking pipe mounting hole and outlet guide vanes.Have the suction socket through with the die cavity of this guide vane on the blade back surface of outlet guide vanes, on the mean camber line of blade tip cross section, corresponding 40 ~ 70% chord positions have the suction port through with the die cavity of this guide vane.The present invention utilize compressor inlet and exit guide blade site pressure poor, the low energy gases at gas compressor rear portion is guided to import by suction structure, effective absorption compressor blade surface low energy gases under powered attendant-controlled wheelchairs condition can not utilized, and make intake-gas come back to gas compressor inside, be fully used.
Description
Technical field
The present invention relates to gas compressor field, specifically a kind of return flow type is to turning adsorption type compressor.
Background technique
Axial flow compressor utilizes the blade of High Rotation Speed for air work, to improve gas pressure.Axial flow compressor is widely used in aeroengine, ground gas turbine and guided missile etc.Higher level pressure ratio and efficiency are the targets that modern gas compressor designer pursues.
The lifting of compressor stage load is often inevitable to be separated along with boundary layer, causes turbomachine efficiency to reduce.By carrying out boundary layer suction at blade surface, air compressor end wall, the low energy fluid in blade surface, air compressor end wall region being absorbed, can effectively weaken or eliminate boundary layer and being separated, thus reach the object significantly improving gas compressor load, promote compressor efficiency.After professor Kerrebrock in 1997 proposes this concept of adsorption type compressor first, Chinese scholars has carried out large quantity research to adsorption type compressor.The adsorption type compressor of NASA and Massachusetts Institute of Technology's design carries out boundary layer suction at blade suction surface along leaf exhibition direction fluting, exits along stator wheel hub.Another kind of Smoking regime is that vent hole is arranged in casing shroud, is released by intake-gas by shroud.This gas compressor effectively improves Capability of Compressor by boundary layer suction.The domestic research about boundary layer suction is confined to numerical simulation more; Mostly experiment is to aspirate for leaf grating boundary layer, floating, Song Yanping, Chen Shaowen, Lu Huawei etc. patent of invention (patent publication No. CN101059131) " blowing or sucking type air compressor cascade experiment system " as old in Harbin Institute of Technology describes a kind of air blowing or sucking type air compressor cascade experiment system in detail, this system is made up of hollow leaf grating, vacuum chamber, flowmeter, vacuum pump etc., can carry out adsorption type compressor CASCADE EXPERIMENT.But said system only can carry out blade suction surface suction experiment, blade surface and blade-cascade end wall cannot be carried out for compressor blade row and combine to aspirate and test.Be in the utility model patent of CN202220756 in the patent No., disclose a kind of adsorption type compressor stator blade, multiple suction bole and multiple baroport is placed with at the suction surface of this compressor stator blade blade, each vacuum chamber of blade inside is all through with integral shroud, after making the intake-gas on blade surface enter vacuum chamber, discharged by integral shroud; Each static pressure chamber of blade inside is all through with integral shroud, baroport is communicated with the static pressure chamber of blade inside, by integral shroud, static pressure is reached gas compressor outside, the change of static pressure before and after suction of blade surface is measured, to determine the impact of blade surface boundary layer suction on Capability of Compressor by baroport.
Counter-rotating compressor breaks traditions axial flow compressor rotor, stator alternating structure, and the stator that will play rectified action in gas compressor is cancelled, and adopts the rotor of counterrotating to reach weight reduction, to improve the object of Capability of Compressor.Massachusetts Institute Technology completes the adsorption type counter-rotating compressor research that three grades of pressure ratios are 27.Northwestern Polytechnical University has built up double countershaft flow air compressor for 2005, and structure mainly comprises import water conservancy diversion leaf row, front-seat rotor, rear row's rotor, outlet water conservancy diversion leaf row, and design speed is 8000r/min.
For boundary layer suction (BLS) under research grade environment is to the mechanism of counter-rotating compressor performance impact, Cao Zhiyuan, Liu Bo etc. carry out the exploration of boundary layer suction for certain double axial flow counter-rotating compressor rotor, offer different suction socket respectively aspirate at rotor and the tangential diverse location of rotor.Result of study shows: after suction, isentropic efficiency increases, and best suction position is at trailing edges; After suction, boundary layer deviation angle obviously reduces.
Be in the utility model patent of ZL202132112 in a kind of patent No., disclose a kind of centrifugal compressor reflux, compression pressurization system gas outlet is communicated with compression pressurization system intake duct by above-mentioned reflux.Improve import stagnation pressure by said apparatus, thus increase the pressure ratio of gas compressor.
In above-mentioned existing liposuction technique, various adsorption type compressor need increase aspirating mechanism, and boundary layer suction needs to consume external energy; In addition, intake-gas is caused outside by this adsorption type compressor, is not utilized effectively, and causes the waste of gas flow.
Summary of the invention
Additionally add aspirating mechanism for overcoming the need existed in prior art, and compressor blade row blade surface and blade-cascade end wall can not aspirating, the deficiency that intake-gas can not effectively utilize simultaneously, the present invention proposes a kind of return flow type to turning adsorption pressure mechanism of qi.
The present invention includes axle, casing, import water conservancy diversion leaf row, front-seat rotor and rear row's rotor, outlet water conservancy diversion leaf row and reflux, take casing as carrier, import water conservancy diversion leaf row, front-seat rotor and rear row's rotor and outlet water conservancy diversion leaf row is placed with successively from the entrance point of axle to outlet end in casing, and described import water conservancy diversion leaf row and outlet water conservancy diversion leaf row are installed in the internal surface of casing, and described front-seat rotor and rear row's rotor are positioned at casing and are arranged on the circumferential surface of axle; It is characterized in that, at described casing outer surface, reflux is installed, the housing of the entrance point of casing has multiple reflow pipe mounting hole, and each reflow pipe mounting hole lays respectively at passage central authorities between each guide vane leaf, and the axial position of each reflow pipe mounting hole on casing is corresponding with guide vane 10 ~ 14% chord length place; The housing of casing outlet end has multiple sucking pipe mounting hole, suction port one_to_one corresponding in each sucking pipe mounting hole and outlet guide vanes.
The blade back surface of described outlet guide vanes has the suction socket through with the die cavity of this guide vane.The center line of this suction socket width direction is positioned at 40 ~ 70% places of this guide vane chord length; The two ends of this suction socket length lay respectively at 10% ~ 90% high place of this guide vane leaf.On the mean camber line in outlet guide vanes blade tip cross section, corresponding 50% chord positions has the suction port through with the die cavity of this guide vane.
Reflux comprises sucking pipe, gas collecting tube, honeycomb duct, valve, flowmeter, plenum chamber and reflow pipe.Described gas collecting tube and plenum chamber are ring pipe fitting; At the inner surface of gas collecting tube ring tube wall, multiple sucking pipe is evenly installed; Each sucking pipe one end is all through with the inner chamber of this gas collecting tube; The other end of sucking pipe is installed in the sucking pipe mounting hole of casing outlet end, is connected with the suction port in the blade tip cross section of each outlet guide vanes, through with outlet guide vanes die cavity.Reflow pipe is evenly distributed with at the inner surface of plenum chamber; Each reflow pipe one end is all through with the inner chamber of this plenum chamber; The other end is installed in the reflow pipe mounting hole of casing mouth end, and channel connection between inlet guide vane leaf.In the tube wall that the two ends of honeycomb duct are respectively charged into gas collecting tube and in the tube wall of plenum chamber, described gas collecting tube is communicated with plenum chamber, and makes gas collecting tube and plenum chamber be connected to become the annulus be parallel to each other.Described valve and flowmeter are connected on described honeycomb duct, and described flowmeter is arranged near plenum chamber side, make described valve installation in close sucking pipe side.
The center line of described sucking pipe and the center line of reflow pipe are all perpendicular to casing external peripheral surface; The centerline parallel of described honeycomb duct is in the center line of casing.
Inlet guide vane in described import water conservancy diversion leaf row is distributed on the circumferential surface of axle, and be installed on outside casing, the established angle of blade root is 90 ゜, and defines passage between guide vane leaf between adjacent two inlet guide vane; The established angle of front-seat rotor rotor blade root is 41 ゜; The established angle of the rotor blade blade root in rear row's rotor is 139 ゜.Outlet guide vanes in outlet water conservancy diversion leaf row is distributed on the circumferential surface of axle, and be installed on outside casing, the established angle of outlet guide vanes blade root is 81 ゜.
The boundary layer gas on outlet guide vanes surface is imported gas collecting tube by suction socket and suction port by described sucking pipe by the present invention, the boundary layer gas imported enters plenum chamber by honeycomb duct, and by reflow pipe by passage between described boundary layer gas importing inlet guide vane leaf.Being absorbed the low energy gases at compressor blade surface, end wall place by boundary layer suction technology, is one of effective ways improving Capability of Compressor.Prior art is many adds pumping equipment in outside, provides negative pressure to be absorbed by low energy gases in boundary layer by pumping equipment, needs to consume external energy; In addition, the gas of absorption is underutilized.The return flow type that the present invention proposes is to turning adsorption pressure mechanism of qi, utilize compressor inlet and exit guide blade site pressure poor, the low energy gases at gas compressor rear portion is guided to import by suction structure, effective absorption compressor blade surface low energy gases under powered attendant-controlled wheelchairs condition can not utilized, and make intake-gas come back to gas compressor inside, be fully used.
Accompanying drawing explanation
Fig. 1 is the 3-D view of outlet guide vanes of the present invention;
Fig. 2 is the 3-D view of outlet water conservancy diversion leaf row;
Fig. 3 is the plan view of each leaf row relative position two dimension view in the present invention;
Fig. 4 is the 3-D view of casing;
Fig. 5 is the partial enlarged drawing of relative position between casket suction bole and leaf are arranged;
Fig. 6 is the 3-D view of suction structure;
Fig. 7 is that return flow type is to the 3-D view turning absorption air compressor structure;
Fig. 8 is plan view of the present invention;
Fig. 9 is internal structure schematic diagram of the present invention;
Figure 10 is the sectional view of suction structure;
Figure 11 is the connection diagram of gas collecting tube in aspirating mechanism, valve, flowmeter, plenum chamber.In figure:
1. import water conservancy diversion leaf row; 2. front-seat rotor leaf row; 3. row's rotor leaf row after; 4. export water conservancy diversion leaf row; 5. casing; 6. reflux; 7. inlet guide vane; 8. front-seat rotor blade; 9. after, arrange rotor blade; 10. outlet guide vanes; 11. sucking pipes; 12. gas collecting tubes; 13. honeycomb ducts; 14. valves; 15. flowmeters; 16. plenum chambers; 17. reflow pipes; 18. axles; 19. reflow pipe mounting holes; 20. suction sockets; 21. suction ports; 22. sucking pipe mounting holes.
Embodiment one
The present embodiment be a kind of return flow type to turning adsorption pressure mechanism of qi, carry out boundary layer suction for territory, counter-rotating compressor exit guide blade suction surface 0-50% leaf exhibition section.The present embodiment improves existing counter-rotating compressor and obtains.
The present embodiment comprises axle, casing, import water conservancy diversion leaf row, front-seat rotor and rear row's rotor, outlet water conservancy diversion leaf row and reflux.The present embodiment take casing as carrier, import water conservancy diversion leaf row, front-seat rotor and rear row's rotor and outlet water conservancy diversion leaf row is placed with successively from the entrance point of axle to outlet end in casing, and described import water conservancy diversion leaf row and outlet water conservancy diversion leaf row are installed in the internal surface of casing 5, and described front-seat rotor and rear row's rotor are positioned at casing 5 and are arranged on the circumferential surface of axle.
In the present invention, outside described casing, reflux is installed, the housing of the entrance point of casing has multiple reflow pipe mounting hole, and each reflow pipe mounting hole to lay respectively between each guide vane leaf passage central authorities, corresponding with the axial position of each reflow pipe mounting hole on casing and guide vane 12% chord length place.The housing of casing outlet end has multiple sucking pipe mounting hole, suction port one_to_one corresponding in each sucking pipe mounting hole and outlet guide vanes.
Described axle employing prior art, arranges rotating shaft by front-seat rotor leaf and rear row's rotor leaf row rotating shaft forms, and described front-seat rotor leaf row's rotating shaft and rear row's rotor leaf arrange turning on the contrary of rotating shaft.
Import water conservancy diversion leaf row 1, front-seat rotor leaf row 2 and rear row's rotor leaf row 3, outlet water conservancy diversion leaf row 4 are arranged in the circumferential surface of axle 18 successively respectively, and wherein import water conservancy diversion leaf row 1 is positioned at the entrance point of axle 18.Described import water conservancy diversion leaf row 1 comprises 22 inlet guide vane 7, all adopts prior art.During installation, 22 inlet guide vane 7 are distributed on the circumferential surface of axle 18, are connected on outside casing 5, make the established angle of inlet guide vane 7 blade root be 90 ゜.Passage between guide vane leaf is defined between two adjacent inlet guide vane 7.
Front-seat rotor leaf row 2 adopts prior art.Described front-seat rotor leaf row 2 comprises 19 front-seat rotor blades 8, and during installation, 19 front-seat rotor blades 8 are distributed on the circumferential surface of axle 18, are connected with axle 18, and blade root established angle is 41 ゜.
Rear row's rotor leaf row 3 adopts prior art.Described rear row's rotor leaf row 3 comprises 20 and arranges rotor blade 9 afterwards, during installation, arranges the circumferential surface that rotor blade 9 is distributed on axle 18 afterwards, is connected with axle 18 for 20.Rear row's rotor blade 9 blade root established angle is 139 ゜.
Outlet water conservancy diversion leaf row 4 comprises 32 outlet guide vanes 10, and during installation, 32 outlet guide vanes 10 are distributed on the circumferential surface of axle 18, are installed on outside casing 5, and outlet guide vanes 10 blade root established angle is 81 ゜.
The blade profile of described outlet guide vanes 10 is identical with the blade profile of C4 blade.The suction socket 20 through with the die cavity of this guide vane is had on the blade back surface of outlet guide vanes 10.The center line of this suction socket 20 width direction is positioned at 50% place of this guide vane chord length, and the width of this suction socket is 2mm; The two ends of this suction socket 20 length lay respectively at 10% and 50% high place of this guide vane leaf.On the mean camber line of the blade tip side botanical origin of outlet guide vanes 10, corresponding 50% chord positions has the suction port 21 through with the die cavity of this guide vane; The diameter of suction port is 2mm.
Described four row interlobate relative positions and assembly relation all consistent with existing gas compressor relevant parameter, there is not any change.
The housing of the entrance point of casing 5 has multiple reflow pipe mounting hole 19; The housing of casing 5 outlet end has multiple sucking pipe mounting hole 22.Described each reflow pipe mounting hole 19 internal diameter is 3mm, to lay respectively between each guide vane leaf passage central authorities, and corresponding with the axial position of each reflow pipe mounting hole on casing and guide vane 12% chord length place.Described each sucking pipe mounting hole 22 diameter is 2mm, and quantity is identical with outlet guide vanes quantity, and with suction port one_to_one corresponding in outlet guide vanes.
Reflux 6 comprises sucking pipe 11, gas collecting tube 12, honeycomb duct 13, valve 14, flowmeter 15, plenum chamber 16 and reflow pipe 17.Described gas collecting tube 12 and plenum chamber 16 are ring pipe fitting, and caliber is 18mm.At the inner surface of gas collecting tube 12 ring tube wall, multiple sucking pipe 11 is installed, sucking pipe external diameter 2mm, long 30mm; Each sucking pipe 11 one end is all through with the inner chamber of this gas collecting tube 12; The other end of sucking pipe 11 is installed in the sucking pipe mounting hole 22 of casing 5 outlet end, is connected with the suction port 21 in the blade tip cross section of each outlet guide vanes 10, through with outlet guide vanes die cavity.Be evenly distributed with 22 reflow pipes 17 at the inner surface of plenum chamber 16, diameter is 3mm, long 30mm; Each reflow pipe 17 one end is all through with the inner chamber of this plenum chamber 16; The other end is installed in the reflow pipe mounting hole 19 of casing 5 entrance point, and channel connection between inlet guide vane leaf.Honeycomb duct 13 has 6, and diameter is 14mm.In the tube wall that the two ends of this honeycomb duct 13 are respectively charged into gas collecting tube 12 and in the tube wall of plenum chamber 16, described gas collecting tube 12 is communicated with plenum chamber 16, and makes gas collecting tube 12 and plenum chamber 16 be connected to become the annulus be parallel to each other.
Described valve 14 and flowmeter 15 are connected on described honeycomb duct 13, and described flowmeter 15 is arranged near plenum chamber 16 side, and described valve 14 is arranged near sucking pipe 11 side.The boundary layer gas flow imported is monitored by flowmeter 15.When to turn adsorption pressure mechanism of qi do not need suction boundary layer gas time, throttle down 14, makes reflux 6 quit work.
The center line of described sucking pipe 11 and the center line of reflow pipe 17 are all perpendicular to casing external peripheral surface; The centerline parallel of described honeycomb duct 13 is in the center line of casing.
In this embodiment, by described sucking pipe 11, the boundary layer gas on outlet guide vanes 10 surface is imported gas collecting tube 12 by suction socket 20 and suction port 21, the boundary layer gas imported enters plenum chamber 16 by honeycomb duct 13, and by reflow pipe 17 by passage between described boundary layer gas importing inlet guide vane leaf.
The invention allows for embodiment 2 ~ embodiment 14.Described embodiment 2 ~ state in embodiment 14, import water conservancy diversion leaf row 1, front-seat rotor leaf row 2, rear row's rotor leaf row 3, outlet water conservancy diversion leaf row 4, casing 5, and the structure of reflux 6 is identical to the structure turning adsorption pressure mechanism of qi with return flow type described in embodiment 1, it is as shown in the table for design parameter:
Claims (4)
1. return flow type is to turning an adsorption pressure mechanism of qi, comprises axle, casing, import water conservancy diversion leaf row, front-seat rotor and rear row's rotor, outlet water conservancy diversion leaf row and reflux; Take casing as carrier, import water conservancy diversion leaf row, front-seat rotor and rear row's rotor and outlet water conservancy diversion leaf row is placed with successively from the entrance point of axle to outlet end in casing, and described import water conservancy diversion leaf row and outlet water conservancy diversion leaf row are installed in the internal surface of casing, and described front-seat rotor and rear row's rotor are positioned at casing and are arranged on the circumferential surface of axle; It is characterized in that, at described casing outer surface, reflux is installed, the housing of the entrance point of casing has multiple reflow pipe mounting hole, and each reflow pipe mounting hole lays respectively at passage central authorities between each guide vane leaf, and the axial position of each reflow pipe mounting hole on casing is corresponding with inlet guide vane 10% ~ 14% chord length place; The housing of casing outlet end has multiple sucking pipe mounting hole, suction port one_to_one corresponding in each sucking pipe mounting hole and outlet guide vanes;
The blade back surface of described outlet guide vanes has the suction socket through with the die cavity of this guide vane; The center line of this suction socket width direction is positioned at 40% ~ 70% of this guide vane chord length; The two ends of this suction socket length lay respectively at this guide vane leaf high 10% ~ 90% in; On the mean camber line in outlet guide vanes blade tip cross section, corresponding 50% chord positions has the suction port through with the die cavity of this guide vane.
2. return flow type, to turning adsorption pressure mechanism of qi, is characterized in that as claimed in claim 1, and reflux comprises sucking pipe, gas collecting tube, honeycomb duct, valve, flowmeter, plenum chamber and reflow pipe; Described gas collecting tube and plenum chamber are ring pipe fitting; At the inner surface of gas collecting tube ring tube wall, multiple sucking pipe is installed; Each sucking pipe one end is all through with the inner chamber of this gas collecting tube; The other end of sucking pipe is installed in the sucking pipe mounting hole of casing outlet end, is connected with the suction port on the blade tip botanical origin of each outlet guide vanes, through with outlet guide vanes die cavity; Reflow pipe is evenly distributed with at the inner surface of plenum chamber; Each reflow pipe one end is all through with the inner chamber of this plenum chamber; The other end is installed in the reflow pipe mounting hole of casing mouth end, and channel connection between inlet guide vane leaf; In the tube wall that the two ends of honeycomb duct are respectively charged into gas collecting tube and in the tube wall of plenum chamber, described gas collecting tube is communicated with plenum chamber, and makes gas collecting tube and plenum chamber be connected to become the annulus be parallel to each other; Described valve and flowmeter are connected on described honeycomb duct, and described flowmeter is arranged near plenum chamber side, make described valve installation in close sucking pipe side.
3. return flow type, to turning adsorption pressure mechanism of qi, is characterized in that as claimed in claim 2, and the center line of described sucking pipe and the center line of reflow pipe are all perpendicular to casing external peripheral surface; The centerline parallel of described honeycomb duct is in the center line of casing.
4. as claimed in claim 2 return flow type to turning adsorption pressure mechanism of qi, it is characterized in that, inlet guide vane in described import water conservancy diversion leaf row is installed on casing, and blade root established angle is 90 ゜, and defines passage between guide vane leaf between adjacent two inlet guide vane; The blade root established angle of front-seat rotor is 41 ゜, is installed in front-seat rotor installation shaft; The established angle of the rotor blade in rear row's rotor is 139 ゜, is installed in rear row's rotor installation shaft; Outlet guide vanes in outlet water conservancy diversion leaf row is distributed on the circumferential surface of axle, and be installed on outside casing, the blade root established angle of outlet guide vanes is 81 ゜.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410177401.4A CN103967812B (en) | 2014-04-29 | 2014-04-29 | A kind of return flow type is to turning adsorption pressure mechanism of qi |
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| CN201410177401.4A CN103967812B (en) | 2014-04-29 | 2014-04-29 | A kind of return flow type is to turning adsorption pressure mechanism of qi |
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| CN103967812B true CN103967812B (en) | 2016-04-20 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2016065737A1 (en) * | 2014-10-30 | 2016-05-06 | 熵零股份有限公司 | Electromagnetic coupling impeller counter-rotating fluid mechanism and thermal power system using same |
| CN105443443A (en) * | 2015-12-10 | 2016-03-30 | 哈尔滨工程大学 | Stability enhancement structure of turbocharger compressor |
| CN107489649B (en) * | 2017-09-07 | 2023-08-25 | 珠海格力电器股份有限公司 | Axial flow fan |
| CN108757565A (en) * | 2018-04-13 | 2018-11-06 | 哈尔滨工程大学 | A kind of compressor blade petiolarea structure based on scaling analysis |
| US11525452B2 (en) | 2018-05-15 | 2022-12-13 | Asia Vital Components Co., Ltd. | Fan frame body structure |
| CN110081014B (en) * | 2019-04-26 | 2021-04-06 | 哈尔滨工程大学 | Centrifugal vortex tube with blades rotating |
| CN112449669A (en) * | 2019-06-28 | 2021-03-05 | 开利公司 | Mixed flow compressor with counter-rotating diffuser |
| CN111779712A (en) * | 2020-07-01 | 2020-10-16 | 奇鋐科技股份有限公司 | Fan frame structure |
| US11905964B2 (en) | 2020-07-03 | 2024-02-20 | Asia Vital Components Co., Ltd. | Fan frame body structure |
| CN111810454A (en) * | 2020-07-17 | 2020-10-23 | 中国航空发动机研究院 | Casing, compressor and stability expanding method based on self-circulation oscillation jet flow |
| CN113758670B (en) * | 2021-09-10 | 2024-03-29 | 中国民航大学 | Planar cascade flow field quality improvement system combining suction and flow guiding wake plates |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2290113B (en) * | 1994-05-31 | 1998-07-15 | Ingersoll Dresser Pump Co | Centrifugal pump |
| JP2010151034A (en) * | 2008-12-25 | 2010-07-08 | Ihi Corp | Centrifugal compressor |
| CN101761511B (en) * | 2010-02-09 | 2011-05-11 | 清华大学 | Asymmetric self-circulation processing machine box of centrifugal compressor with parabolic grooving widths |
| CN102287389A (en) * | 2011-07-07 | 2011-12-21 | 西北工业大学 | Experimental apparatus of compressor grate |
| CN202220756U (en) * | 2011-09-01 | 2012-05-16 | 西北工业大学 | Adsorption type compressor stator blade |
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