CN208870647U - A kind of drag reduction-jet stream coupled structure inhibiting the loss of radial-flow turbine blade tip clearance stream - Google Patents
A kind of drag reduction-jet stream coupled structure inhibiting the loss of radial-flow turbine blade tip clearance stream Download PDFInfo
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Abstract
The utility model relates to a kind of drag reduction-jet stream coupled structure of inhibition radial-flow turbine blade tip clearance stream loss, bionic, drag-reducing structure is arranged in turbine wheel entry zone casing surface；Casing fluidic architecture is arranged in impeller downstream area.Wherein bionic, drag-reducing structure includes: bionic, drag-reducing protrusion, pit, groove etc.；Casing fluidic architecture includes: jet stream seam, jet hole etc., jet direction angle, jet flow, fluidic architecture geometric dimension according to actual condition is determining and adjustment.Turbine types are radial inflow, mixed-flow etc..The utility model can be effectively controlled the loss of radial-flow turbine blade tip clearance stream, improve radial-flow turbine pneumatic efficiency and acting ability, increase turbine to the utilization rate of energy, can be widely used for the multiple fields such as aerospace, communications and transportation, compressed-air energy storage, be particularly suitable for high pressure radial-flow turbine.
Description
Technical field
The utility model relates to the radial-flow turbine fields in fluid machinery, are related to a kind of inhibition radial-flow turbine blade tip clearance stream
The drag reduction of loss-jet stream coupled structure, specifically a kind of radial-flow turbine for coupling a variety of leakage stream damage control technologies.
Background technique
For radial-flow turbine using very extensive, structural shape is also varied, for industrial production, people's life provide electric power and
Power.In order to make the equipment of unit volume output mechanical energy as much as possible under same thermal parameter, it is necessary to improve runoff
The efficiency of turbine.As one kind of rotating machinery, there are relative motions with casing for the impeller of radial-flow turbine, certainly will deposit therebetween
In gap, and this interstitial structure makes the working medium in radial-flow turbine generate blade tip clearance flow losses, and this loss is diameter
The important component of the flow losses of turbine is flowed, therefore using suitable technological means control radial-flow turbine blade tip clearance stream damage
Mistake is the important channel for improving radial-flow turbine efficiency.
Currently, control radial-flow turbine between clearance flow lose technical way be reduce gap size, but this method by
The factors such as the geometry of impeller and casing, processing and installation accuracy, vibration displacement influence, to prevent impeller and casing collision from rubbing
It wipes, gap size can not be too small in practical applications, using being restricted.For the clearance flow damage control between axial-flow turbine
Although there are many technology, leaf top jet stream, the control of leaf top plasma, tip vane structure, leaf top groove structure etc..But it applies
On radial turbine there is a problem in that: one, structure is complicated for radial turbine Top Blade Clearance Flow Field, using single control hand
Section is difficult to effectively reduce a clearance flow loss.Clearance flow can be divided mainly by relative motion between casing and impeller top between radial-flow turbine
Two kinds of " leakage stream " of caused " scraping stream " and vane tip pressure face and suction surface two sides pressure difference generation.And both
The leading role of flowing is with impeller inlet section, interlude and exports the difference of fragment position and has differences: (1) inducer region leaf
Relative velocity is high between impeller blade and casing, and clearance flow loss is larger between scraping stream pair caused by casing relative motion；(2) interlude area
Radius locating for the working medium of domain reduces, and relative flow speed is lower, and scraping action weakens, and leakage stream influences to increase；(3) outlet section region
Working medium moves substantially in the axial direction, and radius further decreases, and leakage stream plays main influence.Two, radial-flow impeller processing structure is special
Very, it differs greatly with axial flow turbine.The vane thickness of conventional axial flow turbine is big, therefore processes ditch in the conventional shaft position stream Ye Ding
Slot, jet stream/suction hole etc. are relatively easy to.But radial-flow turbine outer diameter and vane thickness are small, therefore process ditch in the position Ye Ding
Slot drills through the structures such as jet stream/suction hole and has difficulties.In conclusion needing to use for radial-flow turbine structure and processing characteristic
The method that a variety of clearance flow damage control means combine realizes the raising of radial-flow turbine efficiency.
Utility model content
To solve the problems, such as that radial turbine blade tip clearance stream type is more, loss is big, operational efficiency is low, acting ability is weak,
The utility model discloses a kind of drag reduction-jet stream coupled structure of inhibition radial-flow turbine blade tip clearance stream loss, which is solved
Clearance flow loses big problem between radial-flow turbine, meets the demand of radial-flow turbine efficient operation, promotes radial-flow turbine in height
Imitate the application in operating system.The technology keeps radial-flow turbine operational efficiency higher, while having the spies such as easy to process, low cost
Point, has broad application prospects.
In order to achieve the above objectives, the technical solution of the utility model is as follows:
A kind of drag reduction-jet stream coupled structure inhibiting the loss of radial-flow turbine blade tip clearance stream, the radial-flow turbine includes diameter
Stream impeller and casing, the radial-flow impeller are disposed coaxially in the casing, and the radial-flow impeller is uniformly distributed more along its circumferential direction
A runoff blade, there are blade tip clearances between the top and the casing of the runoff blade, which is characterized in that
The casing inner surface of the radial-flow turbine entrance circumferentially has bionic, drag-reducing structure, the bionic, drag-reducing along it
Structure is to reduce caused by scraping stream caused by the relative motion between the top and the casing the runoff blade
Wall friction loss；
The casing inner surface in the radial-flow turbine exit circumferentially has a fluidic architecture along it, the fluidic architecture to
Jet-stream wind is low using clearance leakage of blade tip whirlpool to change the distribution characteristics in the radial-flow turbine exit clearance leakage of blade tip whirlpool
The load and acting ability for pressing feature raising turbo blade blend feature reduction blade tip clearance and let out by changing leakage stream and mainstream
Leak eddyloss.
The control structure for inhibiting the loss of radial-flow turbine blade tip clearance stream of the utility model, the principle of the clearance flow damage control therebetween
Are as follows: radial-flow turbine blade tip clearance stream loses mainly scraping stream caused by by Ye Dingyu casing relative motion and vane tip pressure face
With leakage stream joint effect caused by suction surface pressure difference.Scraping stream and casing high-speed friction generate wall friction loss；Blade top
The leakage stream and mainstream that portion's pressure face and suction surface pressure difference are formed blend to form leakage stream loss, and the two loss mechanism is different, because
This needs that different flow control techniques is taken to reduce flow losses.Subtract by using the drag reduction structures based on bionics principle
Wall friction caused by few scraping stream is lost；Improve clearance leakage of blade tip vortices breakdown and distribution characteristics by casing fluidic architecture,
While reducing flow losses, blade acting ability is improved using leakage vortex low pressure property, is improved efficiency.
Preferably, the upstream arrangement of the radial-flow impeller has stator blade.
Preferably, the type of the radial-flow turbine is radial inflow, mixed-flow etc., and the radial-flow turbine is single-stage or multistage knot
Structure.Turbine number and geometric shape and structure size, revolving speed are determined with design parameter.
In the control structure for inhibiting the loss of radial-flow turbine blade tip clearance stream of the utility model, in impeller inlet region position
It sets, bionic, drag-reducing structure is arranged on casing, by reducing the frictional resistance of impeller inlet air-flow and casing, reduce air-flow damage
It loses.
Preferably, the bionic, drag-reducing structure is arranged in array, and shape can be convex closure, pit, rib, groove etc..
Geometric dimension according to specific radial-flow turbine of the quantity of drag reduction structures, spacing distance, depth/height, radius, length, operation
Parameter determines.
Preferably, the bionic, drag-reducing structure can be processed directly on casing, can also will have bionic, drag-reducing structure
Film be attached on casing and realize.With the difference of operating condition, by replacement casing and film to change drag reduction structures ginseng
Number, realizes optimal control effect.
In the drag reduction-jet stream coupled structure for inhibiting the loss of radial-flow turbine blade tip clearance stream of the utility model, go out in impeller
Fluidic architecture is arranged at the casing position in mouth region domain, is changed the distribution characteristics in clearance leakage of blade tip whirlpool by jet stream gas, is utilized leaf
It pushes up tip leakage vortex low pressure signature and improves turbo blade load and acting ability, feature is blended by change leakage stream and mainstream and is subtracted
Few clearance leakage of blade tip eddyloss.
Preferably, the fluidic architecture is the jet stream seam for being arranged circumferentially in the casing inner surface in the radial-flow turbine exit
Or jet hole etc., the jet stream seam or the jet stream air horn degree of jet hole, jet stream throughput are determined according to radial-flow turbine design parameter.
For given radial-flow turbine, jet stream air horn degree, jet stream throughput can actively be adjusted according to operating condition, improved the turbine and existed
Acting ability and efficiency under off-design behaviour.
It is described bionical in the drag reduction-jet stream coupled structure for inhibiting the loss of radial-flow turbine blade tip clearance stream of the utility model
The specific geometric parameter of both drag reduction structures, fluidic architecture and flow parameter are determined by OVERALL OPTIMIZA-TION DESIGN FOR, guarantee control effect
It is optimal.
Preferably, its Working medium gas source of the radial-flow turbine include atmosphere, motor exhaust, Boiler Steam, combustion gas,
Industrial discharge flue gas, compressed air, solar thermal collector steam, storage heater steam, chemical process gas etc..
Preferably, the radial-flow turbine, the working medium be air, nitrogen, oxygen, carbon dioxide, natural gas, ammonia,
Freon etc..
Another aspect according to the present utility model, additionally provides a kind of radial-flow turbine, and the radial-flow turbine includes that this is practical
The control structure of novel above-mentioned inhibition radial-flow turbine blade tip clearance stream loss.
Compared with the existing technology, the utility model the advantages of with have the beneficial effect that
1. drag reduction-jet stream the coupled structure for inhibiting the loss of radial-flow turbine blade tip clearance stream of the utility model, using module
Change design, control geometric parameter can realize multiple combinations, therefore the adaptability of the geometric shape and operating condition to radial-flow turbine
By force.
2. bionic, drag-reducing structure is carried out to couple optimization with casing fluidic architecture, make all kinds of caused by clearance flow between radial-flow turbine
Loss obtains comprehensively control, and energy utilization efficiency is higher, acting ability enhancing, the radial-flow turbine suitable for different load grade.
Detailed description of the invention
Fig. 1 is radial-flow turbine interior air-flow process chart；
Fig. 2 is the control structure schematic diagram for inhibiting the loss of runoff wheel blade tip clearance stream；
Fig. 3 is the bionic, drag-reducing structural schematic diagram of radial-flow turbine entrance, wherein (a) is the drag reduction structures of pit pattern,
(b) it is the drag reduction structures of convex closure form, (c) is the drag reduction structures of rib form, (d) is the drag reduction structures of channel away；
Fig. 4 is radial-flow turbine casing fluidic architecture schematic diagram, wherein (a) is jet stream crack structure, (b) is jet stream pore structure；
Specific embodiment
The structure of the utility model, technical solution are further described specifically with reference to the accompanying drawing, provided practical
Novel one embodiment.
As shown in Figure 1, radial-flow turbine includes radial-flow impeller 10 and casing 20, radial-flow impeller 10 is co-axially located at casing 20
Interior, radial-flow impeller 10 is uniformly distributed multiple runoff blades 11 along its circumferential direction, between the top of runoff blade 11 and the casing 20
There are blade tip clearances.Stator blade 30 can be further arranged in the upstream of radial-flow impeller 10.Radial-flow turbine can be radial inflow, mixed-flow
Deng, and radial-flow turbine can be single-stage or multilevel structure.The number and geometry and structure size of radial-flow turbine, revolving speed are with setting
Parameter is counted to determine.When working medium air-flow flows in radial-flow turbine, working medium initially enters Turbomachinery 30, adds in Turbomachinery 30
Speed subsequently enters radial-flow impeller 10 and pushes wheel rotation acting, while air-flow pushes impeller to do work in impeller, flow direction
Also it changes.Due to the presence of radial-flow turbine blade tip clearance, there are blade tip clearance stream damages when air-flow flows in radial-flow turbine
It loses, radial-flow turbine blade tip clearance stream loses mainly scraping stream caused by by 20 relative motion of Ye Dingyu casing and vane tip pressure
Leakage stream joint effect caused by face and suction surface pressure difference.Scraping stream and 20 high-speed friction of casing generate wall friction loss；Leaf
The leakage stream and mainstream that piece top pressure face and suction surface pressure difference are formed blend to form leakage stream loss, and the two loss mechanism is not
Together, and the leading role of two kinds of flowings with impeller inlet section, interlude and exports the difference of fragment position and has differences, inducer
Relative velocity is high between region radial-flow impeller and casing, and clearance flow loss is larger between scraping stream pair caused by casing relative motion；It is intermediate
Radius locating for the working medium of section region reduces, and relative flow speed is lower, and scraping action weakens, and leakage stream influences to increase；Outlet section area
Domain working medium moves substantially in the axial direction, and radius further decreases, and leakage stream plays main influence.The difference flowed for two kinds is special
Point needs to use different flowing control structures to reduce flow losses.
As shown in Fig. 2, to inhibit the loss of radial-flow turbine blade tip clearance stream, different sections of the utility model in radial-flow turbine
Provided with different types of control structure, comprising: (1) the bionic, drag-reducing structure 40 on turbine inlet casing surface is arranged in；(2) it sets
Set the fluidic architecture 50 on turbine outlet casing surface.
As shown in figure 3, to reduce the loss of the wall friction caused by scraping stream, in the machine of impeller inlet regional location
Arrange that pit, convex closure, rib can be used in bionic, drag-reducing structure 40, the bionic, drag-reducing structure 40 on import casing surface on casket inner surface
The structures such as line, groove, the form parameter (depth, diameter) of bionic, drag-reducing structure, spacing distance, distribution are according to radial-flow turbine
The parameters such as inlet air flow speed, viscosity determine, in figure, parameter D is pit or trench depth, and H is rising height, and S is pit, dashes forward
It rises, the spacing of groove, W, W1、W2For pit, protrusion, groove width.Bionic, drag-reducing structure 40 can add directly on casing 20
Film with bionic, drag-reducing structure can also be attached on casing 20 and realize by work.With the difference of operating condition, by replacing
Casket or film change planes to change bionic, drag-reducing structure, realizes optimal control effect, and reduce the processing to casing, reduce at
This.
As shown in figure 4, being control room clearance flow leakage rate, fluidic architecture is set on the casing wall surface in turbine outlet region
50, casing fluidic architecture can be using structure types such as jet stream seam, jet holes；The position of fluidic architecture, incident slit width degree, incidence
Bore dia, entrance aperture interval, the angle of incident air flow, the mass flow of incident air flow are true according to radial-flow turbine actual design parameter
Fixed, for the casing fluidic architecture of specific radial-flow turbine, angle, the mass flow of incident air flow of incident air flow can be with operations
Operating condition is adjusted, and improves acting ability and efficiency under turbine off-design behaviour.
When using jet stream crack structure, jet stream seam and wheel disc distance C flow to the position that gap circulation becomes according to gap scraping
It determines.Jet stream stitches slit width L, jet stream mechanism of qi casket jet stream is shot downward, and angle α, casing jet deflection angle beta, jet flow are transported according to radial-flow turbine
Row operating condition.When the operating condition of radial-flow turbine changes, jet stream mechanism of qi casket jet stream shoot downward angle α, casing jet deflection angle beta,
Jet flow can adjust accordingly, and radial-flow turbine is made also to be able to maintain higher acting ability and efficiency under off-design behaviour.
Bionic, drag-reducing structure 40, outlet 50 two kinds of control structures of casing fluidic architecture on above-mentioned import casing surface are adopted simultaneously
With and be coupled in radial-flow turbine, by the comprehensively control between clearance flow different type, realize the function that clearance flow is lost between inhibiting.
Through the foregoing embodiment, the purpose of this utility model is completely effectively realized.Person skilled in art can be with
Understand that the utility model includes but is not limited to content described in attached drawing and the above specific embodiment.Although the utility model is
Just it is now recognized that the most practical and preferred embodiment is illustrated, it should be understood that the utility model be not limited to it is disclosed
The modification of embodiment, any function and structure principle without departing from the utility model is intended to be included in the range of claims
In.
Claims (6)
1. a kind of drag reduction-jet stream coupled structure for inhibiting the loss of radial-flow turbine blade tip clearance stream, the radial-flow turbine includes runoff
Impeller and casing, the radial-flow impeller are disposed coaxially in the casing, and the radial-flow impeller is uniformly distributed multiple along its circumferential direction
Runoff blade, there are blade tip clearances between the top and the casing of the runoff blade, it is characterised in that:
The radial-flow turbine entry zone, casing inner surface circumferentially have bionic, drag-reducing structure along it；
The radial-flow turbine exit region, casing inner surface circumferentially have fluidic architecture along it.
2. coupled structure according to claim 1, which is characterized in that the upstream arrangement of the radial-flow impeller has stator blade.
3. coupled structure according to claim 1, which is characterized in that the type of the radial-flow turbine is radial inflow, mixed flow
Formula etc., the radial-flow turbine are single-stage or multilevel structure.
4. coupled structure according to claim 1, it is characterised in that: the bionic, drag-reducing structure is arranged in array, shape
State is convex closure, pit, rib or groove, wherein convex closure, pit, rib, the quantity of groove, spacing distance, depth, height, half
Diameter, length are determined according to actual operating mode.
5. coupled structure according to claim 1, it is characterised in that: the fluidic architecture is jet stream seam or jet hole, institute
State position, the incident slit width degree, incident bore dia, entrance aperture interval, the angle of incident air flow, the matter of incident air flow of fluidic architecture
Flow is measured to be determined according to practical radial-flow turbine design parameter.
6. a kind of radial-flow turbine, which is characterized in that the radial-flow turbine includes the described in any item suppressions of the claims 1 to 5
Drag reduction-jet stream coupled structure of radial-flow turbine blade tip clearance stream loss processed.
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| CN201821496890.XU CN208870647U (en) | 2018-09-13 | 2018-09-13 | A kind of drag reduction-jet stream coupled structure inhibiting the loss of radial-flow turbine blade tip clearance stream |
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| CN201821496890.XU CN208870647U (en) | 2018-09-13 | 2018-09-13 | A kind of drag reduction-jet stream coupled structure inhibiting the loss of radial-flow turbine blade tip clearance stream |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108915789A (en) * | 2018-09-13 | 2018-11-30 | 中国科学院工程热物理研究所 | A kind of loss of radial-flow turbine blade tip clearance stream it is passive-actively couple control technology |
| CN113586560A (en) * | 2021-07-27 | 2021-11-02 | 大连海事大学 | Pit type intermediate casing capable of inhibiting flow separation |
-
2018
- 2018-09-13 CN CN201821496890.XU patent/CN208870647U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108915789A (en) * | 2018-09-13 | 2018-11-30 | 中国科学院工程热物理研究所 | A kind of loss of radial-flow turbine blade tip clearance stream it is passive-actively couple control technology |
| CN108915789B (en) * | 2018-09-13 | 2023-08-04 | 中国科学院工程热物理研究所 | Passive-active coupling control structure for clearance flow loss of top of radial turbine blade |
| CN113586560A (en) * | 2021-07-27 | 2021-11-02 | 大连海事大学 | Pit type intermediate casing capable of inhibiting flow separation |
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Effective date of registration: 20231017 Address after: No. 603, Floor 6, Building 2, Yard 2, Yongjie South Road, Haidian District, Beijing 100094 Patentee after: Huake Super Energy (Beijing) Energy Technology Co.,Ltd. Address before: Room 301-63, 3rd Floor, Building A1, Qinghe Jiayuan East District, Haidian District, Beijing, 100185 Patentee before: ZHONGCHU GUONENG (BEIJING) TECHNOLOGY Co.,Ltd. |