CN102720701A - Asymmetric reversible S-shaped vane profile design - Google Patents
Asymmetric reversible S-shaped vane profile design Download PDFInfo
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- CN102720701A CN102720701A CN2012102374024A CN201210237402A CN102720701A CN 102720701 A CN102720701 A CN 102720701A CN 2012102374024 A CN2012102374024 A CN 2012102374024A CN 201210237402 A CN201210237402 A CN 201210237402A CN 102720701 A CN102720701 A CN 102720701A
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Abstract
The invention belongs to the technical field of reversible vane profile design and manufacture, and relates to a type of asymmetric double-head double-vane S-shaped vane profile design on basis of CFD (Computational Fluid Dynamics) numerical simulation. The metro ventilation reversible axial flow fan adopting the design has identical or similar favorable fan performances under the forward and backward rotation conditions. The asymmetric reversible S-shaped vane profile design has the effects and benefits that when the reversible fan adopting the conventional vane profile is used for backward ventilation, the efficiency decreases by 28.2% as compared with forward ventilation, so that the requirement on backward ventilation of the reversible fan can not be satisfied; otherwise, the forward ventilation efficiency of the optimal fan with the asymmetric reversible S-shaped vane profile only decreases by 3.283% as compared with that of the fan with the conventional vane profile, and the backward ventilation efficiency increases by 9.227% relative to that of the fan with the conventional profile, therefore, the efficiency difference is less than 6%, and further the requirements on the reversible fan can be met satisfactorily; in addition, both the forward and the backward ventilation efficiencies achieve over 80%, so that the performance of the fan is improved satisfactorily.
Description
Technical field
The invention belongs to reversible fan Airfoil Design and manufacturing technology field; Relate to a kind of asymmetric double end two-shipper wing S type Airfoil Design, can all have identical or close good fan performance under the operating mode rotating and reverse with the reversible axial-flow blower with the subway ventilation of this Airfoil Design based on the CFD numerical simulation.
Background technique
Subway ventilation is mainly born the gas exchange work, the particularly smoke evacuation under accident conditions (containing fire, obstruction etc.) of underground inner space of subway and outside place, additional new wind etc. with blower fan.This just requires blower fan can realize forward and reverse air-supply, and this blower fan is called reversible fan, and its aerofoil profile is called reversible aerofoil profile.The remarkable difference of reversible fan and common ventilator just is that it not only will guarantee the performance that forward ventilates; Also to guarantee to satisfy the requirement of inverted ventilation under the accident conditions simultaneously; Rotate and reverse and have identical or close good fan performance under the operating mode; The air quantity Q and the total head p size that are the clockwise and anticlockwise air-supply are wanted basically identical, and this adopts special aerofoil profile just can reach with regard to needing.
Domestic and international at present research and application aerofoil profile more widely are complete symmetrical S type aerofoil profile, and the characteristics of this kind aerofoil profile are that the mean camber line of aerofoil profile is S-type, and reverse symmetrical fully along the chord length center.This kind aerofoil profile efficient is lower.And the present invention is through blower fan flow field and the performance of numerical analysis with several kinds of asymmetric airfoils of contrast, final acquisition can be under design conditions positive and negative both direction mobile performance more excellent asymmetric S type aerofoil profile relatively all.
Summary of the invention
Technical problem to be solved by this invention is that this aerofoil profile can guarantee blower fan under design conditions for reversible fan provides a kind of asymmetric S type Airfoil Design, and positive and negative both direction flows and all can reach greater efficiency and rational Flow Field Distribution.
Technological scheme of the present invention is following:
(1) select a kind of original aerofoil profile, the side that thickness is big is as leading edge, and its Far Left point is positioned on the true origin (0,0); The little side of thickness is as trailing edge, and the whole chord length of aerofoil profile is 1.
(2) integral body with original aerofoil profile is reduced into original 0.6 times, and the aerofoil profile after dwindling is along X axle mirror image, again along Y axle mirror image.The aerofoil profile trailing edge of gained is received on the outlet circular arc of original aerofoil profile trailing edge, the stack back whole chord length of aerofoil profile is greater than 1.
(3) carrying out the chamfering smooth treatment, is the center of circle with (1.1,3.11), is that radius is drawn circular arc with 3.09, intersects with upper half part of aerofoil profile molded lines, removes upper half part molded lines that constitutes aerofoil profile behind the unnecessary line;
In like manner, be the center of circle with (0.87 ,-2.58), be that radius is drawn circular arc with 2.57, intersect with lower half portion of aerofoil profile molded lines, remove lower half portion molded lines of the aerofoil profile that unnecessary line constitutes, asymmetric reversible S type aerofoil profile is accomplished basically;
With the asymmetric S type aerofoil profile of gained is scaled be and chord length such as original aerofoil profile, chord length is 1, and asymmetric reversible S type aerofoil profile is accomplished.
Effect of the present invention and benefit are that the efficient when adopting the reversible fan inverted ventilation of original aerofoil profile is ventilated to comparing with forward and descended 28.2%; Can't reach reversible fan inverted ventilation performance requirement; And the more former aerofoil profile of blower fan forward efficient of optimum asymmetric S type aerofoil profile is only compared and has been descended 3.283%; But reverse efficient has improved 19.227% relatively, and forward and reverse efficient differs less than 6%, can well satisfy the reversible fan requirement; And forward and reverse efficient all reaches more than 80%, has well promoted the performance of blower fan.
Description of drawings
Fig. 1 is the original aerofoil profile that the present invention adopts.
Fig. 2 is the asymmetric S type aerofoil profile that the present invention designs.
Fig. 3 is the sterogram of the impeller that designs of the present invention.
Embodiment
Embodiment 1
Reversible aerofoil profile adopts original NACA2412 aerofoil profile, and is as shown in Figure 1.
What thickness was bigger is leading edge, and in the left side, its Far Left point is positioned on the true origin (0,0); What thickness was less is trailing edge, and the whole chord length of aerofoil profile is 1.Original aerofoil profile global similarity is reduced into original 0.6 times.Along X axle mirror image, again along Y axle mirror image, the less trailing edge of profile thickness this moment is positioned at the left side with the aerofoil profile after similar the dwindling, and the leading edge that thickness is bigger is positioned at the right.The trailing edge of the aerofoil profile of gained is received on the outlet circular arc of trailing edge of original aerofoil profile, the whole chord length of aerofoil profile is greater than 1.Carrying out the chamfering smooth treatment then, is the center of circle with (1.1,3.11), is that radius is drawn circular arc with 3.09, intersects with upper half part of aerofoil profile molded lines, removes upper half part molded lines that constitutes aerofoil profile behind the unnecessary line; In like manner, be the center of circle with (0.87 ,-2.58), be that radius is drawn circular arc with 2.57, intersect with lower half portion of aerofoil profile molded lines, remove lower half portion molded lines of the aerofoil profile that unnecessary line constitutes, asymmetric reversible S type aerofoil profile is accomplished basically.With the asymmetric S type aerofoil profile of gained is scaled be and chord length such as original aerofoil profile, chord length is 1, and asymmetric reversible S type aerofoil profile is accomplished.
Embodiment 2
As shown in Figure 3, adopt 3D sculpting software to generate the 3D solid figure of draught fan impeller.Using this aerofoil profile to use the impeller blade number of reversible fan as the ventilation of parent form design is 8, and hub ratio d is 0.4, and rotating speed is 1000n/ (rmin
-1), mean chord b is 0.342m, wheel hub established angle β
HABe 67 °, outer radius established angle β
TAIt is 57 °.Numerical simulation softwares such as employing NUMECA carry out numerical simulation, and 5 kinds of asymmetric S type aerofoil profile blower fans that designed are carried out forward and reverse three dimensional steady flow field analysis.Calculate the given stagnation temperature 293K of import, stagnation pressure 101300pa exports given mass flow rate 170kg/s.
Claims (1)
1. the novel asymmetric double end two-shipper wing S type aerofoil profile based on CFD numerical simulation design is characterized in that selecting for use earlier a kind of aerofoil profile as original aerofoil profile, is that parent form is designed the different asymmetric double end two-shipper wing S type aerofoil profiles of chord length reversal connection ratio such as four kinds with it.Asymmetric S type aerofoil profile with 0.6 times of chord length of reversal connection is an example; Concrete design method is: original aerofoil profile global similarity is reduced into original 0.6 times; Receive on the outlet circular arc of original aerofoil profile after 180 ° of the counterrotatings, carry out the chamfering smooth treatment then, smooth to guarantee the following current of aerofoil profile molded lines transition light.Last on the prerequisite of proof strength with the gained aerofoil profile is scaled be and chord length such as original aerofoil profile again.The aerofoil profile of other reversal connection ratios in like manner can get.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102374024A CN102720701A (en) | 2012-07-10 | 2012-07-10 | Asymmetric reversible S-shaped vane profile design |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102374024A CN102720701A (en) | 2012-07-10 | 2012-07-10 | Asymmetric reversible S-shaped vane profile design |
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| CN102720701A true CN102720701A (en) | 2012-10-10 |
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| CN2012102374024A Pending CN102720701A (en) | 2012-07-10 | 2012-07-10 | Asymmetric reversible S-shaped vane profile design |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762827A (en) * | 2016-12-16 | 2017-05-31 | 上海置信节能环保有限公司 | A kind of asymmetric S types airfoil fan and its design and application process |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4895091A (en) * | 1988-10-17 | 1990-01-23 | Elmali Nuri E | Reversible camber line flexible wing sail |
| CN2235039Y (en) * | 1995-12-27 | 1996-09-11 | 西安交通大学 | Two-head reversing asymmetrical fan blade |
| RU2148524C1 (en) * | 1999-10-21 | 2000-05-10 | Кульбида Владимир Евгеньевич | Multipurpose sail system and method of its operation |
-
2012
- 2012-07-10 CN CN2012102374024A patent/CN102720701A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4895091A (en) * | 1988-10-17 | 1990-01-23 | Elmali Nuri E | Reversible camber line flexible wing sail |
| CN2235039Y (en) * | 1995-12-27 | 1996-09-11 | 西安交通大学 | Two-head reversing asymmetrical fan blade |
| RU2148524C1 (en) * | 1999-10-21 | 2000-05-10 | Кульбида Владимир Евгеньевич | Multipurpose sail system and method of its operation |
Non-Patent Citations (1)
| Title |
|---|
| 谢蓉、高博: "非对称可逆轴流风机S型翼型的设计与性能研究", 《风机技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762827A (en) * | 2016-12-16 | 2017-05-31 | 上海置信节能环保有限公司 | A kind of asymmetric S types airfoil fan and its design and application process |
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Application publication date: 20121010 |