CN103670528B - Loading method for turbine blade - Google Patents
Loading method for turbine blade Download PDFInfo
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- CN103670528B CN103670528B CN201310705405.0A CN201310705405A CN103670528B CN 103670528 B CN103670528 B CN 103670528B CN 201310705405 A CN201310705405 A CN 201310705405A CN 103670528 B CN103670528 B CN 103670528B
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Abstract
The present invention provides a kind of loading method of turbine blade, the load character of the two-dimentional blade profile of the turbine blade is controlled by the geometric parameter UGT size of blade profile, and geometric parameter UGT is as follows along the high changing rule of leaf:
, wherein H- blade height, C- root of blade chord length; 1. UGT1 is constant as X ＞ 0.45, between 16 ° ~ 22 °; 2. UGT2 is constant as X ＜ 0.05, between 4 ° ~ 10 °; 3. in the opposite leaf high scope of root of blade region (0, X) and top area (1-X, 1), UGT3-1 is distributed along leaf height with parabola rule as 0.05≤X≤0.45; In the opposite leaf high scope of middle part of blade region (X, 1-X), UGT3-2 is constant, and the value of UGT3-2 is identical as above-mentioned UGT2. The present invention specifies specific situation, the degree of control load and control range of the blade profile load along the high regularity of distribution of leaf, in actual engineering design, is conducive to large-scale application and popularization, strong operability.
Description
Technical field
The present invention relates to the design field of turbine blade, be specifically a loading method for turbine blade, mainly refer to the controlling method of the load of vane type line along the distribution of leaf height: namely determine different load diatibution methods according to the height H of blade and depth-width ratio (blade height H/ blade chord length C).
Background technique
Turbine flow efficiency depends on the aeroperformance of through-flow interior quiet, moving vane to a great extent.Primarily two-dimensional blade profile application process and control the flow field of blade passage inside along the high three-dimensionally shaped rule of leaf in blade, also determines the aeroperformance of blade.
For the design of primarily two-dimensional blade profile, mainly reduce the profile loss in Cascade Flow as much as possible.(load in leaf grating runner mainly concentrates on the front edge area of blade to the basic blade profile of front loading, (1) in Fig. 1) and aft-loading airfoil (load in leaf grating runner mainly concentrates on the trailing edge region of blade, (2) in Fig. 1) in control leaf grating profile loss, all reach higher level.But on the whole, front loading leaf grating than afterloaded cascade relative more effectively (the diffusion degree on aft-loading airfoil more difficult Controlling outline curve back of the body arc), has less profile loss in control profile loss.
For the three-dimensionally shaped design of blade, mainly primarily two-dimensional molded line is amassed folded according to certain torsion rule and bending rule on blade height direction, thus realize the effective control to three-dimensional flow field.Reverse the Method for Flow Pattern Design that rule embodies blade, effective control of bending rule reflection BLADE FORCE stream field intrinsic parameter distribution.
After blade is three-dimensionally shaped, on the profile loss basis that the basic blade profile of two dimension is intrinsic, create complicated Three-dimension flow in leaf grating runner, mainly add the secondary flow loss of end regions (root of blade leaf high ((3) in Fig. 2) and Ye Gao region, top ((5) in Fig. 2)).At present; for the main method reducing secondary flow loss be: after using a kind of height, load basic molded line; by by near the load transfer of molded line to trailing edge; postpone the generation of Secondary Flow; the development of effective control secondary flow in passage, simultaneously according to certain molded line modelling, torsion and bending rule, realizes the three-dimensional modeling of blade; thus the flow field effectively controlled in blade passage, reduce flow losses.The main deficiency of this method is that whole blade all adopts a kind of height aft-loading airfoil along leaf height, and for there is no Secondary Flow flow effect or affecting less blade middle leaf height region, still adopt the height aft-loading airfoil of more difficult control profile loss, vane type line load is not controlled along the distribution that leaf is high, the flow losses of central region finally may be caused to increase.
The design method of fore-loaded airfoil used in combination and aft-loading airfoil in same blade is proposed in patent CN1982653A, namely at root, the overhead height region use aft-loading airfoil of blade, at utmost control secondary flow loss, and use fore-loaded airfoil in blade middle height region ((4) in Fig. 2), at utmost reduce profile loss.This change blade loading, along the method for the leaf high regularity of distribution, can utilize the advantage of fore-loaded airfoil and aft-loading airfoil simultaneously, reduces total flow losses further.But, say from another point of view, patent CN1982653A only proposes a kind of macroscopic design theory, the design method of more details is not proposed, as blade profile load along the high regularity of distribution of leaf specifically the degree of what form, control load and control range be how many etc., this operability applied in the engineering design of reality is not strong.
Summary of the invention
The object of the invention is to: provide that a kind of more comprehensively, more specifically a kind of blade profile load is along the high location mode of leaf relative to prior art.
The technical solution adopted in the present invention is:
The loading method of turbine blade, the load character of the two-dimentional blade profile of described turbine blade is controlled by the geometric parameter UGT size of blade profile, and geometric parameter UGT is: on adjacent blade profile inner arc exit point to back of the body arc corresponding to adjacent blade profile back of the body arc beeline point, tangent line and blade profile carry on the back the angle between tangent line that arc exit point place blade profile carries on the back arc; Geometric parameter UGT is as follows along the Changing Pattern that leaf is high:
, wherein H-blade height, C-root of blade chord length;
1. as X > 0.45, UGT1 is constant, between 16 ° ~ 22 °;
2. as X < 0.05, UGT2 is constant, between 4 ° ~ 10 °;
3., when 0.05≤X≤0.45, within the scope of the relative leaf height of root of blade region (0, X) and top area (1-X, 1), UGT3-1 distributes along leaf is high with parabola rule;
Within the scope of the relative leaf height of blade central region (X, 1-X), UGT3-2 is constant, and the value of UGT3-2 is identical with above-mentioned UGT2.
Described UGT3-1 is high as follows with parabola rule distribution mathematical model along leaf:
，0＜h≤X·H
，（1-X）·H＜h≤H
Wherein, the height of h-distance root, 0 < h≤H.
The beneficial effect that the present invention produces is:
The present invention is a kind of loading method of turbine blade, height H and depth-width ratio H/C(blade height H/ root of blade chord length C according to blade) determine different load distribution methods.In blade, the load character of two-dimentional blade profile controls mainly through the geometric parameter UGT size of blade profile, namely by the geometric parameter UGT that controls two-dimentional blade profile along the high Changing Pattern of leaf, obtain blade loading along the high Distribution dynamics of leaf.The present invention specify that blade profile load is along the high concrete situation of the regularity of distribution, the degree of control load and the control range of leaf, in the engineering design of reality, is beneficial to large-scale application and popularization, strong operability.
Accompanying drawing explanation
Fig. 1 is two-dimentional blading nomenclature schematic diagram.
Fig. 2 be blade root, in, top area schematic.
When Fig. 3 is X > 0.45, blade loading is along leaf high regularity of distribution schematic diagram.
When Fig. 4 is X < 0.05, blade loading is along leaf high regularity of distribution schematic diagram.
When Fig. 5 is 0.05≤X≤0.45, blade loading is along leaf high regularity of distribution schematic diagram.
Code name implication in figure: the front edge area 1, in plane cascade runner, 2, trailing edge region in plane cascade runner, 3, root of blade height region, 4, blade middle height region, 5, vane tip height region.
Embodiment
As shown in Fig. 1 ~ 5, the present invention is a kind of loading method of turbine blade, and refer to the controlling method of the load of vane type line along the distribution of leaf height, the load character of the two-dimentional blade profile of turbine blade is controlled by the geometric parameter UGT size of blade profile.Geometric parameter UGT is: adjacent blade profile inner arc exit point carries on the back tangent line on back of the body arc corresponding to arc beeline (throat position) point to adjacent blade profile, and blade profile carries on the back the angle between tangent line that arc exit point place blade profile carries on the back arc, namely the vertical line of blade profile throat line of position OO and blade profile carry on the back the angle between arc exit point tangent line PP.Geometric parameter UGT along the high Changing Pattern of leaf by the height H of blade and depth-width ratio H/C(blade height H/ root of blade chord length C) determine, specific as follows:
, wherein H-blade height, C-root of blade chord length;
Tentatively can determine the influence area of secondary flow according to above formula, the X in above formula represents the proportion that shared by root, secondary flow region, top, the total leaf of blade is high.Therefore:
1. as X > 0.45, UGT1 is constant, between 16 ° ~ 22 °; As shown in Figure 3.
As X > 0.45, show that secondary flow proportion is comparatively large, the secondary flow region sum of root, top area accounts for the high proportion of total leaf more than 90%.Now, the two-dimentional blade profile in whole blade height can use a kind of aft-loading airfoil, and rear loading level can be determined by blading nomenclature UGT1, generally between 16 ° ~ 22 °.
2. as X < 0.05, UGT2 is constant, between 4 ° ~ 10 °; As shown in Figure 5.
As X < 0.05, show that secondary flow proportion is less, the proportion that the secondary flow region sum of root, top area accounts for total leaf high is no more than 10%.Now, the two-dimentional blade profile in whole blade height can use a kind of fore-loaded airfoil, and front loading level can be determined by blading nomenclature UGT2, generally between 4 ° ~ 10 °.
3. when 0.05≤X≤0.45, only use a kind of fore-loaded airfoil or aft-loading airfoil all at utmost cannot reduce flow losses, and rationally change blade profile load can reach control secondary flow loss and minimizing profile loss simultaneously object along the regularity of distribution that leaf is high, as shown in Figure 4, two kinds of situations are had:
A, within the scope of the relative leaf height of root of blade region (0, X) and top area (1-X, 1), UGT3-1 distributes along leaf is high with parabola rule; Further, UGT3-1 is high as follows with parabola rule distribution mathematical model along leaf:
，0＜h≤X·H
，（1-X）·H＜h≤H
Wherein, the height of h-distance root, 0 < h≤H.
B, within the scope of the relative leaf height of blade central region (X, 1-X), UGT3-2 is constant, and the value of UGT3-2 is identical with above-mentioned UGT2.
This is the concrete regularity of distribution meeting load.
Claims (2)
1. the loading method of turbine blade, it is characterized in that: the load character of the two-dimentional blade profile of described turbine blade is controlled by the geometric parameter UGT size of blade profile, and geometric parameter UGT is: on adjacent blade profile inner arc exit point to back of the body arc corresponding to adjacent blade profile back of the body arc beeline point, tangent line and blade profile carry on the back the angle between tangent line that arc exit point place blade profile carries on the back arc; Geometric parameter UGT is as follows along the Changing Pattern that leaf is high:
, wherein H-blade height, C-root of blade chord length, X represents the proportion that shared by root, secondary flow region, top, the total leaf of blade is high;
1. as X > 0.45, UGT1 is constant, between 16 ° ~ 22 °;
2. as X < 0.05, UGT2 is constant, between 4 ° ~ 10 °;
3., when 0.05≤X≤0.45, within the scope of the relative leaf height of root of blade region (0, X) and top area (1-X, 1), UGT3-1 distributes along leaf is high with parabola rule;
Within the scope of the relative leaf height of blade central region (X, 1-X), UGT3-2 is constant, and the value of UGT3-2 is identical with above-mentioned UGT2.
2. the loading method of turbine blade according to claim 1, is characterized in that: described UGT3-1 is high as follows with parabola rule distribution mathematical model along leaf:
，0＜h≤X·H
，（1-X）·H＜h≤H
Wherein, the height of h-distance root, 0 < h≤H.
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| CN201310705405.0A CN103670528B (en) | 2013-12-20 | 2013-12-20 | Loading method for turbine blade |
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| CN103670528B true CN103670528B (en) | 2015-04-22 |
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| CN108757046B (en) * | 2018-06-29 | 2020-07-14 | 东方电气集团东方汽轮机有限公司 | Turbine blade |
| CN114483204B (en) * | 2021-12-29 | 2023-07-14 | 东方电气集团东方汽轮机有限公司 | Stationary blade suitable for radial-axial vertical non-vertical air inlet |
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| CN2328790Y (en) * | 1997-05-13 | 1999-07-14 | 北京全三维动力工程有限公司 | Rear loading static blade for tangential turbine |
| JP4086415B2 (en) * | 1999-06-03 | 2008-05-14 | 株式会社荏原製作所 | Turbine equipment |
| US6398489B1 (en) * | 2001-02-08 | 2002-06-04 | General Electric Company | Airfoil shape for a turbine nozzle |
| JP2006207556A (en) * | 2005-01-31 | 2006-08-10 | Toshiba Corp | Turbine blade train |
| US7686567B2 (en) * | 2005-12-16 | 2010-03-30 | United Technologies Corporation | Airfoil embodying mixed loading conventions |
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