CN102849207A - Ducted lift-fan flow deflectors and transmission mechanism thereof - Google Patents
Ducted lift-fan flow deflectors and transmission mechanism thereof Download PDFInfo
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- CN102849207A CN102849207A CN2012101836153A CN201210183615A CN102849207A CN 102849207 A CN102849207 A CN 102849207A CN 2012101836153 A CN2012101836153 A CN 2012101836153A CN 201210183615 A CN201210183615 A CN 201210183615A CN 102849207 A CN102849207 A CN 102849207A
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- flow deflector
- duct
- flow
- flow deflectors
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Abstract
The invention discloses ducted lift-fan flow deflectors and a transmission mechanism thereof. According to the invention, a plurality of flow deflectors are arranged in parallel, and are arranged in a ducted through rotation shafts provided on two ends of each of the flow deflectors. The flow deflectors are divided into two sets, and flow deflectors in each set are not pairwisely adjacent. Output shafts of two servos are respectively connected with different transmission links through rotation rods. One transmission link is hinged with a bent bar fixedly connected to a set of flow deflectors. With the structure, flow deflector angle deflection can be driven. With the flow deflectors and the transmission mechanism provided by the invention, air flow direction can be changed, and air flow volume can be controlled. The structure is simple, safe, and reliable. With the flow deflectors and the transmission mechanism, aircraft structural requirements can be satisfied, good aerodynamic efficiency is provided, and multi-dimensional deflection effect is realized.
Description
Technical field
The present invention relates to the mechanism design for the control of duct lift fan exit flow, specifically comprise flow deflector and the deflection of control flow deflector and the transmission device of aggregate motion.
Background technology
Ducted fan is a kind of axial flow of fluid propelling unit, therefore, can only be axial flow for the air-flow by this duct, especially when axially being the upright position.In order effectively to utilize the power of ducted fan, so in duct, add the flow deflector that is suitable for this outlet, utilize the deflection of flow deflector to control the direction of exit flow.
Flow deflector adopts aerofoil profile as grown form, when the lift fan in the duct provide for low speed flow the time, be suitable for adopting Low Speed Airfoil.When flow deflector can be near certain medium angle of attack, the air current flow of aerofoil was best, was to adhere to mobilely, and stall spot is little.In addition, different duct shape of cross sections also is different for the requirement of flow deflector.For the design of lift fan duct, the transmission of flow deflector also is varied.According to different duct shapes, the shape of flow deflector also is not quite similar.Existing flow deflector transmission normally by a connecting rod control a plurality of flow deflectors in the same way, synchronously deflection, mode of operation is comparatively single.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of kinematic mechanism that utilizes flow deflector deflection and combination, thereby fully reach the needed different directions of control exit flow, remedied the single direction deflection control of flow deflector.
The technical solution adopted for the present invention to solve the technical problems is: comprise steering wheel, flow deflector and kinematic link, several flow deflector arrangement in parallels, rotating shaft by the flow deflector two ends is installed in the duct, flow deflector is divided into two groups, every group of flow deflector is non-conterminous in twos, the output shaft of two steering wheels connects different kinematic links by bull stick respectively, and knee affixed on kinematic link and the one group of flow deflector is hinged, the angular deflection of drive flow deflector.Control different steering wheels and adjust the deflection of respectively organizing flow deflector, realize the different directions control of duct air-flow by the cooperation of two groups of flow deflectors.
When two groups flow deflector angles were 0 °, flow deflector was complete closure state in duct.
The flow deflector aerofoil profile is the low speed symmetrical airfoil.
Each flow deflector is connected with the duct wall by an anchor shaft, and the position of anchor shaft is selected between the leading edge and focus of flow deflector, is 60% ~ 70% of leading edge and focus spacing apart from focal length.
Knee is connected between the leading edge and anchor shaft of flow deflector.
The invention has the beneficial effects as follows: in the changes in deflection process of flow deflector, by the translation of steering wheel control kinematic link on longitudinal plane, drive the flow deflector that carries out with it swivel coupling, realize that flow deflector is changed by the angle that 0 ° of dextrorotation of level attitude goes between 97 °.When two groups flow deflector angles were 0 °, flow deflector was complete closure state in duct; Under 90 °, the water conservancy diversion perpendicular direction of this moment is downward accordingly, and the lift of this moment is maximum.When needs are determined exit flow in a direction, can allow two groups to be parastate and to carry out water conservancy diversion.In addition, also can with one group of a deflection or with two groups of flow deflectors to different clockwise deflection, so not only can change the direction of air-flow, more can control the size of air-flow.
Can select corresponding aerofoil profile as the key model of flow deflector according to different duct lift sizes, the flow deflector aerofoil profile of determining herein is the symmetrical airfoil under the Low Speed Airfoil.Each flow deflector fixedly be by an axle it to be connected with the duct wall, and the position of anchor shaft is selected near the leading edge place of aerofoil profile and with the focal position of aerofoil profile and is more or less the same, and doing like this is to balance each other for the moment of flexure of the pulling force on the connecting rod with the aerodynamic force countershaft place of place, focal position generation.Between the leading edge of flow deflector and anchor shaft, determine the knee that is connected with flow deflector to fetch the purpose that reaches the deflection of control flow deflector by the ball pivot between this knee and the connecting rod.The advantages such as this flow deflector structure has simple in structure, and is safe and reliable can adapt to the structural requirement of aircraft, and preferably pneumatic efficiency is arranged, and have realized the water conservancy diversion effect of various dimensions.
Description of drawings
Fig. 1 is the simple and easy schematic diagram of the transmission of flow deflector;
Fig. 2 is that two groups of flow deflectors in the duct move to the birds-eye view under a certain state;
Fig. 3 (a) is that two groups of flow deflectors all are the vertical configuration schematic diagram, Fig. 3 (b) is that two groups of flow deflectors all are the 45° angle schematic diagram, Fig. 3 (c) and Fig. 3 (d) are differential rotation schematic diagram, and Fig. 3 (c) is that one group of flow deflector is sail angle, and another group is any drift angle; Fig. 3 (d) is one group and is vertical, and another group is any drift angle.
Fig. 4 is specific embodiment;
Among the figure, 1-anchor shaft, 2-flow deflector, 3-knee, 4-kinematic link, 5-bull stick, 6-steering wheel.
The specific embodiment
The present invention includes steering wheel, flow deflector and kinematic link, several flow deflector arrangement in parallels, rotating shaft by the flow deflector two ends is installed in the duct, flow deflector is divided into two groups, every group of flow deflector is non-conterminous in twos, the output shaft of two steering wheels connects different kinematic links by bull stick respectively, and knee affixed on kinematic link and the one group of flow deflector is hinged, the angular deflection of drive flow deflector.Control different steering wheels and adjust the deflection of respectively organizing flow deflector, realize the different directions control of duct air-flow by the cooperation of two groups of flow deflectors.
When two groups flow deflector angles were 0 °, flow deflector was complete closure state in duct.
The flow deflector aerofoil profile is the low speed symmetrical airfoil of NACA series.
Each flow deflector is connected with the duct wall by an anchor shaft, and the position of anchor shaft is selected between the leading edge and focus of flow deflector, is 60% ~ 70% of leading edge and focus spacing apart from focal length.
Knee is connected between the leading edge and anchor shaft of flow deflector.
The present invention is further described below in conjunction with drawings and Examples.
The present embodiment is a kind of flow deflector transmission device of four link transmissions, comprises for the bull stick 5 and the steering wheel 6 that flow deflector are fixed on anchor shaft 1 on the duct wall, flow deflector 2, are connected with steering wheel with knee 3, connecting rod 4, simplification that flow deflector is connected.The part design size at flow deflector place is seen Fig. 4.Design parameter is as follows:
Duct diameter: 440mm
Flow deflector adopts aerofoil profile: NACA0009
The every group of adjacent flow deflector spacing of mechanism: 66mm
The maximum length of flow deflector: 400mm
The fixed rotating shaft diameter of flow deflector: 1mm
Knee point of action diameter: 1mm
Connecting rod diameter: 1.5mm
Flow deflector drift angle scope: 0 °-107 °
Flow deflector is when fully closed, and is concentric with duct.Compare with the duct diameter, flow deflector lacks 20mm than the duct diameter, and purpose is to be unlikely to clash with the duct wall during in deflection when flow deflector.Engagement height between connecting rod and the flow deflector is no more than 15mm.Structure as mentioned above, on the anchor shaft to bear maximum bearing force be 16.5N, the maximum distortion of the flow deflector that aspect ratio is larger is no more than 1mm.
Claims (5)
1. a duct lift fan flow deflector and transmission device thereof, comprise steering wheel, flow deflector and kinematic link, it is characterized in that: several flow deflector arrangement in parallels, rotating shaft by the flow deflector two ends is installed in the duct, flow deflector is divided into two groups, and every group of flow deflector is non-conterminous in twos, and the output shaft of two steering wheels connects different kinematic links by bull stick respectively, knee affixed on kinematic link and the one group of flow deflector is hinged, drives the angular deflection of flow deflector.
2. duct lift fan flow deflector according to claim 1 and transmission device thereof, it is characterized in that: when described two groups flow deflector angle was 0 °, flow deflector was complete closure state in duct.
3. duct lift fan flow deflector according to claim 1 and transmission device thereof, it is characterized in that: described flow deflector aerofoil profile is the low speed symmetrical airfoil.
4. duct lift fan flow deflector according to claim 1 and transmission device thereof, it is characterized in that: described flow deflector all is connected with the duct wall by an anchor shaft, and the position of anchor shaft is selected between the leading edge and focus of flow deflector, is 60% ~ 70% of leading edge and focus spacing apart from focal length.
5. duct lift fan flow deflector according to claim 1 and transmission device thereof, it is characterized in that: described knee is connected between the leading edge and anchor shaft of flow deflector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101836153A CN102849207A (en) | 2012-06-06 | 2012-06-06 | Ducted lift-fan flow deflectors and transmission mechanism thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101836153A CN102849207A (en) | 2012-06-06 | 2012-06-06 | Ducted lift-fan flow deflectors and transmission mechanism thereof |
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| CN102849207A true CN102849207A (en) | 2013-01-02 |
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| CN2012101836153A Pending CN102849207A (en) | 2012-06-06 | 2012-06-06 | Ducted lift-fan flow deflectors and transmission mechanism thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6318668B1 (en) * | 1996-08-02 | 2001-11-20 | Allison Advanced Development Company | Thrust vectoring techniques |
| CN1465862A (en) * | 2002-06-20 | 2004-01-07 | 王建钧 | Improved end blade guiding propeller |
| US20090084907A1 (en) * | 2006-03-01 | 2009-04-02 | Urban Aeronautics Ltd. | Ground Effect Vanes Arrangement |
| CN101875397A (en) * | 2009-04-28 | 2010-11-03 | 同济大学 | Duct structure for airship |
| CN202911948U (en) * | 2012-06-06 | 2013-05-01 | 西北工业大学 | Flow diversion drive mechanism for duct lift fan |
-
2012
- 2012-06-06 CN CN2012101836153A patent/CN102849207A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6318668B1 (en) * | 1996-08-02 | 2001-11-20 | Allison Advanced Development Company | Thrust vectoring techniques |
| CN1465862A (en) * | 2002-06-20 | 2004-01-07 | 王建钧 | Improved end blade guiding propeller |
| US20090084907A1 (en) * | 2006-03-01 | 2009-04-02 | Urban Aeronautics Ltd. | Ground Effect Vanes Arrangement |
| CN101875397A (en) * | 2009-04-28 | 2010-11-03 | 同济大学 | Duct structure for airship |
| CN202911948U (en) * | 2012-06-06 | 2013-05-01 | 西北工业大学 | Flow diversion drive mechanism for duct lift fan |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130102 |