CN103775388B - Plunder and turn round formula three dimendional blade Diffuser and design method - Google Patents
Plunder and turn round formula three dimendional blade Diffuser and design method Download PDFInfo
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Abstract
The present invention plunders to turn round formula three dimendional blade Diffuser, its structure is that blade inlet edge profile design becomes to plunder shape, plunder angle within the scope of ± 45 °, blade adapts to incoming flow exhibition and reverses to different flow angle, primary blades is designed to three-dimension integrally structure from import to axially exporting, and in primary blades passage, back segment is provided with splitterr vanes.Advantage: the interaction weakening shock wave and boundary layer, improves flowing in Diffuser; Eliminate the blade surface airflow breakaway because positive negative angle of attack that part leaf eminence is larger causes and load loss, reduce flow losses, thus make the stator part Diffuser of centrifugal/inclined flow air compressor can reach higher efficiency and pressure ratio.Change shock strength and even eliminate shock wave, weaken the impact that shock wave and Boundary Layer Interaction bring simultaneously; Avoid the flow losses that excessive positive incidence or negative angle of attack bring, improve expanding ability and the operating range of Diffuser, to help the raising of whole level Capability of Compressor.
Description
Technical field
The present invention relates to be centrifugal or plunderring of inclined flow air compressor turns round formula three dimendional blade Diffuser and design method, exhibition can be adapted to transonic speed inflow condition heterogeneous, reduce flow losses in Diffuser, thus the function that makes to calm the anger reaches higher efficiency and pressure ratio, belongs to radial-flow compressor technical field.
Background technique
Since half a century, power plant development, power to weight ratio requires to improve constantly, and requires to reduce number of components as far as possible, reduce part dimension with weight reduction simultaneously, and this just needs to improve centrifugal (or oblique flow) gas compressor single-stage pressure ratio.Under the existing requirement improved constantly centrifugal compressor pressure ratio, diffuser intake Mach number will reach about 1.0, and the velocity of sound enters to fail to be convened for lack of a quorum to cause to form shock wave in Diffuser Ban Wuye district.Existence and the Boundary Layer Interaction of shock wave aggravate the producing and developing be separated in Diffuser, reduce Diffuser diffusion ability and efficiency, and whole Capability of Compressor is sharply declined.
High load centrifugal compressor impeller outlet port due to blade all very large to tip slippage degree and flow field structure difference from root, make Diffuser be faced with exhibition to the obvious nonlinear inflow of difference.Existing Diffuser adopts inducer to stretch blade (Fig. 1) along exhibition to the vertical pulling that blade angle is identical, and this blade is adapted to uniform incoming flow, there is very large loss for speed and flow angle along exhibition to the incoming flow significantly changed.
Speed along exhibition to significantly change cause diffuser intake flow field to include subsonic velocity and ultrasound velocity region simultaneously, inspire Three-Dimensional Shock Wave face, shock wave and blade surface Boundary Layer Interaction promote suction surface flow separation, cause serious flow losses, therefore control shock strength and position significant for raising diffuser performance.
Stream air angle along exhibition to significantly change make blade along exhibition to the angle of attack also significantly change, cause the nearly blade tip of Diffuser according to the design of mean air flow angle to be in large positive incidence state and blade root has large negative angle of attack.The large positive incidence state in nearly blade tip place can cause suction surface airflow breakaway, and this situation makes nearly blade tip position import increase to venturi shrinkage degree, suction surface local accelerates to cause strong shock, strong shock and boundary layer disturb initiation to be separated, the generation be separated and development cause the loss of Diffuser diffusion ability Doenward flow to increase, and reduce the operating range of Diffuser; There is larger negative angle of attack and pressure side formation low velocity zone can be caused even to be separated in nearly blade root place, causes load to be lost.(fig. 2 illustrates the angle of attack along exhibition to flow feature heterogeneous.）。
Summary of the invention
What the present invention proposed is that one is plunderred and turned round formula three dimendional blade Diffuser and design method, its objective is that comprehensive adaptation opens up to the non-homogeneous feature that transonic speed becomes a mandarin, effectively control shock-wave spot and intensity, weaken the interaction of shock wave and boundary layer, elimination blade tip and blade root cause the flowing state such as flow separation or load loss owing to there is the larger angle of attack, make blade along exhibition to being in best range of angles of attack always, area change simultaneously along process control passage regulates diffusion degree, thus obtains high-performance Diffuser.
Technical solution of the present invention: plunder and turn round formula three dimendional blade Diffuser, its structure is that blade inlet edge profile design becomes to plunder shape, blade adapts to incoming flow exhibition and reverses to different flow angle, and primary blades is designed to three-dimension integrally structure from import to axially exporting, and passage back segment is provided with splitterr vanes.
Plunder the design method turning round formula three dimendional blade Diffuser, comprise the steps:
1) diffuser passage edge is opened up to (i.e. leaf height direction), is divided into n(n >=5) individual cross section, form a unit channel between adjacent sections;
2) shape leading edge structure is plunderred
By plunderring angle, this is plunderred angle and is defined as axial Z and blade inlet edge curve and often puts acute angle folded by tangent line, is just counterclockwise, otherwise be negative, plunder angle within the scope of ± 45 °, obtain to distribution the leading edge curve that blade plunders shape along exhibition, thus determine the meridional channel leading edge inlet diameter in n cross section;
3) channels configuration angle is given
According to the distribution of stream air angle, determine each corresponding blade angle of cross section inlet, based on the inlet vane angle in each cross section, provide the distribution of corresponding channels configuration angle;
4) unit channel design
By adjacent two cross sections, whole diffuser passage is divided into n-1 unit channel during channels designs, then designs for unit passage, as shown in Figure 6.Two sections channels configuration angle separately according to the Component units passage provided in step 3) distributes in conjunction with meridional channel determination channel centerline; Given cross sectional area is along channel centerline change determining unit channel shape; The actual circumferential area being changed into passage by aisle spare and channels configuration angle is distributed along meridional channel, difference then between the one-period area of annular that is rotarily formed of meridional channel and real area is blade, blade mean camber line is identical with channel center wire shaped, and two sections vane thickness is identical;
5) section blades correction
After completing n-1 unit channel design according to step 4), all there are two values in all the other section blades thickness except cross section 1 and cross section n, and the mean value getting both is the vane thickness in this cross section; After above-mentioned process, determine the blade shape in n cross section, then obtain a series of blade profiles comprising torsional characteristics; Cut out each cross section and be less than step 2) in the blade of respective cross-section meridional channel inlet diameter, by each blade inlet edge again rounding, obtain a series of blade profile;
6) plunder turn round primary blades and splitterr vanes design generate
Blade profile on each for the n of acquisition cross section is fitted to three-dimensional and plunders twisted blade, intercept the blade of blade trailing edge to length place, front 30% ~ 80%, thinning formation splitterr vanes, complete plunderring/twisted blade formula diffuser Design.
Advantage of the present invention: the interaction weakening shock wave and boundary layer, improves flowing in Diffuser; Eliminate the blade surface airflow breakaway because positive negative angle of attack that part leaf eminence is larger causes and load loss, reduce flow losses, thus make the stator part Diffuser of centrifugal/inclined flow air compressor can reach higher efficiency and pressure ratio.Change shock strength and even eliminate shock wave, weaken the impact that shock wave and Boundary Layer Interaction bring simultaneously; Avoid the flow losses that excessive positive incidence or negative angle of attack bring, improve expanding ability and the operating range of Diffuser, to help the raising of whole level Capability of Compressor.
Accompanying drawing explanation
Accompanying drawing 1 is existing conformal channel diffuser schematic diagram.
Accompanying drawing 2 is that the exhibition of diffuser intake section difference is to position flow schematic diagram.
Accompanying drawing 3 is skewed blade design diagrams, and its left figure intercepts Diffuser meridional channel leading edge, and z is axially, and R is radial.
Accompanying drawing 4-(a) is for centrifugal compressor diffuser inlet air flow angle in twisted blade Diffuser is along exhibition to distribution (distribution of stream air angle) schematic diagram.
Accompanying drawing 4-(b) suitably adjusts as Diffuser different cross section inlet vane angle for choosing n point value in twisted blade Diffuser, provides channels configuration angle distribution schematic diagram.
The twisted blade schematic diagram that accompanying drawing 4-(c) designs for 4-(b) with reference to the accompanying drawings, wherein
βbe defined as air current flow direction and tangential angle,
β k for channels configuration angle is defined as the angle of channel centerline and meridian plane, Z for exhibition to, L is meridional channel direction.
Accompanying drawing 5 plunders twisted blade formula Diffuser schematic diagram.
Accompanying drawing 6-(a) for channels configuration angle distribution schematic diagram, L be meridional channel direction.
Accompanying drawing 6-(b) is in conjunction with meridional channel determination channel centerline schematic diagram.
The channel shape schematic diagram that accompanying drawing 6-(c) is determined between cross section 1 and cross section 2 for cross sectional area along channel centerline change.
Accompanying drawing 6-(d) is that the difference between annular cycle area and real area is blade schematic diagram.
Accompanying drawing 7 is each section of passage handing-over processing method schematic diagram.
In Fig. 11 is primary blades, and 2 is splitterr vanes, and 3 is Ban Wuye district.Primary blades and splitterr vanes are prismatic blades, and vane inlet place is identical to blade angle along exhibition.
Embodiment
Below in conjunction with accompanying drawing, technological scheme of the present invention is described further:
Plunder and turn round formula three dimendional blade Diffuser, its structure is that blade inlet edge profile design becomes to plunder shape, plunders angle within the scope of ± 45 °, adapts to the twist blade of incoming flow exhibition to different flow angle, what both combined and are formed plunders and turns round formula blade three-dimensional diffuser, and in primary blades passage, back segment is provided with splitterr vanes.As shown in Figure 5.
Plunder the design method turning round formula blade three-dimensional diffuser, some cross sections are chosen as design section in exhibition to passage during design diffuser vane, then form a unit channel between adjacent two cross sections, the design of the unit channel shape that distributed by area distributions and cross-sectional configuration angle, by the unit combination of channels three-dimensional channel that also adjustment formation is complete, namely determining three dimendional blade shape, according to plunderring shape leading edge curve modification blade inlet edge, finally obtaining the diffuser vane comprising and plunder and turn round feature.
Specific design method, comprises the following steps
1) diffuser passage is divided into n(n >=5 along exhibition to (leaf height direction)) individual cross section, form a unit channel between adjacent sections;
2) design of shape leading edge is plunderred
(plunder angle to be defined as axial Z and blade inlet edge curve and often to put acute angle folded by tangent line by plunderring angle, just be counterclockwise, otherwise be negative, plunder angle within the scope of ± 45 °) obtain to distribution the leading edge curve (in accompanying drawing 3 left figure) that blade plunders shape along exhibition, thus determine the meridional channel leading edge inlet diameter in n cross section;
3) channels configuration angle design
According to stream air angle distribution (accompanying drawing 4-(a)), determine each corresponding blade angle of cross section inlet, based on the inlet vane angle in each cross section, provide corresponding channels configuration angle distribution (accompanying drawing 4-(b));
4) single channel design
By adjacent two cross sections, whole diffuser passage is divided into n-1 unit channel during channels designs, then designs for unit passage.Cross section 1 and the single hop channels designs process folded by cross section 2 is provided in accompanying drawing 6-(a) ~ accompanying drawing 6-(d), inlet diameter elects the minimum value of cross section 1 and cross section 2 inlet diameter as, and the channels configuration angle according to the cross section 1 provided in step 2 and cross section 2 distributes (accompanying drawing 6-(a)) in conjunction with meridional channel determination channel centerline (accompanying drawing 6-(b)); Provide cross sectional area and change the channel shape (accompanying drawing 6-(c)) determined between cross section 1 and cross section 2 along channel centerline; Change into actual annulus area by aisle spare and channels configuration angle to distribute along meridional channel, difference then between annular cycle area and real area is blade (accompanying drawing 6-(d)), blade mean camber line is identical with channel center wire shaped, and cross section 1 is identical with the vane thickness in cross section 2; Channels designs process between all the other cross sections is identical;
5) section blades correction
After completing n-1 unit channel design according to step 3), all there are two values in all the other section blades thickness except cross section 1 and cross section n, and the mean value getting both is the vane thickness in this cross section, accompanying drawing 7; After above-mentioned process, determine the blade shape in n cross section, then obtain a series of blade profiles (can twist blade accompanying drawing 4-(c) be fitted to) comprising torsional characteristics; Cut out the blade that each cross section is less than respective cross-section meridional channel inlet diameter in step 1, by each blade inlet edge again rounding, obtain comprising a series of blade profiles of plunderring shape feature;
6) plunder turn round primary blades and splitterr vanes design
Blade profile on each cross section is fitted to three dimendional blade, complete Diffuser plunder turn round primary blades design.Intercept and plunder the blade of a certain position of twisted blade to trailing edge, reduce formation splitterr vanes according to a certain percentage, complete and plunder twisted blade diffuser Design.
It is by adjustment diffuser vane leading edge curve shape that described diffuser vane leading edge plunders shape, change entrance shock wave and effectively adjust shock strength in the position in Ban Wuye district, weaken the interaction of shock wave and boundary layer, the initial position of separation delay, decreases shock loss and separation losses.
Described diffuser vane reverses, by adjustment exhibition to diverse location channels configuration angle, inlet's blade is all within the scope of optimal attack angle along exhibition to airflow direction, adapt to the impeller outlet angle of attack along exhibition to the feature significantly changed, weaken strong shock and separation that nearly blade tip causes suction surface to accelerate to produce very soon due to larger positive incidence; Avoid the pressure side low velocity zone that causes due to larger negative angle of attack state near blade root place and diffusion ability declines simultaneously, improve Diffuser and the whole level performance of gas compressor.
Described Diffuser three-dimension integrally blade, by Diffuser runner from import to axially exporting the entirety that permeates, achieve the control to whole process of circulation air-flow expansion and turnover, be conducive to reducing the loss in flow process, make Diffuser reach peak work capacity.
Implementation method: by Diffuser three dimendional blade along exhibition to being divided into n cross section, by plunderring the design of shape to the control realization of meridional channel costa, accompanying drawing 3; By completing the design of blade twist to the control at channels configuration angle, accompanying drawing 4-(a) ~ accompanying drawing 4-(c); By completing the design of whole diffuser passage along the relation between journey area and channels configuration angle; Above three kinds of design method are combined the diffuser Design realizing plunderring/turn round formula blade.
Embodiment
1) determine the overall dimensions of Diffuser, comprise inlet diameter 300mm, inlet vane height 15mm, maximum diameter 450mm and axial length 95mm, design meridional channel shape.Diffuser meridional channel is divided into 7 cross sections along exhibition to (blade height direction).
2) given angle of plunderring is along exhibition to being constant value 15 °, i.e. sweepforward, and the inlet diameter of the 3rd cross section (intermediate cross-section) is design load 300mm, in conjunction with import blade height 15mm, then can determine that import leading edge curve (as figure left in accompanying drawing 3, wherein plunders angle
α=15 °, cross section n=7), and then determine the inlet diameter in 1 ~ 7 cross section
d 1 ~
d 7 .
3) according to stream air angle along exhibition to the regularity of distribution determine the channel angle of 7 cross section inlets
β 1 ~
β 7 (accompanying drawing 4-(a), its middle section n=7).Inlet passage angle, 1st cross section is
β 1 , outlet port is 0 °, and design the distribution of channels configuration angle, cross section 2 ~ 7 is the same, then determine channels configuration angle distribution (accompanying drawing 4-(b), its middle section n=7) in each cross section.
4) whole diffuser passage is divided into 1-2,2-3,3-4,4-5,5-6 and 6-7 totally six unit channels by cross section 1-7, designs separately each passage.First design 1-2 single channel, inlet diameter is chosen for
d 1 with
d 2 minimum value, design meridional channel (i.e. the corresponding proportion value of overall meridional channel, as cross section 2 meridian line coordinate
r 2 =
r 1 + (
r 7 -
r 1 ) × 1 ÷ 6,
z 2 =
z 1 + (
z 7 -
z 1 ) × 1 ÷ 6, revises accordingly to leading edge), calculate channel centerline (accompanying drawing 6 (a)-Fig. 6 (b)) according to the channels configuration angle distribution in cross section 1 and cross section 2 and meridional channel shapometer.Provide 5 positions on channel centerline
l 1 ~
l 5 place's valid circulation area
a 1 ~
a 5 the distribution of whole aisle spare is obtained by curve, and then obtain channel shape (accompanying drawing 6-(c)), according to the runner annulus area obtaining relevant position on meridional channel along the valid circulation area of channel centerline and channel angle, the difference of the annulus area of cycle channel and runner annulus area is vane thickness and product highly, thus determining vane thickness (accompanying drawing 6-(d)), cross section 1 and cross section 2 at meridional channel L position vane thickness are
.All the other five channel shapes and respective vanes thickness are obtained according to above-mentioned steps.
5) except cross section 1 and cross section 7, cross section 2 ~ 6 has all calculated two vane thicknesses in single channel design process, as cross section 2 exists
two values are averaged the vane thickness obtaining corresponding meridional channel position, cross section 2 by two thickness
t 2 (accompanying drawing 7, wherein n=7), then obtain this section blades shape, clip diameter and be less than
d 2 institute a little, by blade inlet edge again rounding, obtain the final blade shape in cross section 2, other 6 cross section processing methods are the same.
6) blade in 7 cross sections is carried out opening up obtain the three dimendional blade of plunderring and turning round to matching.Intercept blade 50% to trailing edge place, vane thickness is thinned to original 40%, obtains splitterr vanes, be combined into complete Diffuser (accompanying drawing 5).
It is by adjustment diffuser vane leading edge curve shape that described diffuser vane leading edge plunders shape, change entrance shock wave and effectively adjust shock strength in the position in Ban Wuye district, weaken the interaction of shock wave and boundary layer, the initial position of separation delay, decreases shock loss and separation losses.
Diffuser vane reverses, to diverse location channels configuration angle by adjustment exhibition, inlet's blade is all within the scope of optimal attack angle along exhibition to airflow direction, adapt to the impeller outlet angle of attack along exhibition to the feature significantly changed, weaken strong shock and separation that nearly blade tip causes suction surface to accelerate to produce very soon due to larger positive incidence; Avoid the pressure side low velocity zone that causes due to larger negative angle of attack state near blade root place and diffusion ability declines simultaneously, improve Diffuser and the whole level performance of gas compressor.
Claims (1)
1. plunder and turn round formula three dimendional blade Diffuser, it is characterized in that blade inlet edge profile design becomes to plunder shape, blade adapts to incoming flow exhibition and reverses to different flow angle, and primary blades is designed to three-dimension integrally structure from import to axially exporting, and passage back segment is provided with splitterr vanes; Its design method, comprises the steps:
1) by diffuser passage along exhibition to, i.e. leaf height direction, is divided into n cross section, n >=5, between adjacent sections composition a unit channel;
2) shape leading edge structure is plunderred
By plunderring angle, this is plunderred angle and is defined as axial Z and blade inlet edge curve and often puts acute angle folded by tangent line, is just counterclockwise, otherwise be negative, plunder angle within the scope of ± 45 °, obtain to distribution the leading edge curve that blade plunders shape along exhibition, thus determine the meridional channel leading edge inlet diameter in n cross section;
3) channels configuration angle is given
According to the distribution of stream air angle, determine each corresponding blade angle of cross section inlet, based on the inlet vane angle in each cross section, provide the distribution of corresponding channels configuration angle;
4) unit channel design
By adjacent two cross sections, whole diffuser passage is divided into n-1 unit channel during channels designs, then design for unit passage, the two sections channels configuration angle separately according to the Component units passage provided in step 3) distributes in conjunction with meridional channel determination channel centerline; Given cross sectional area is along channel centerline change determining unit channel shape; The actual circumferential area being changed into passage by cross sectional area and channels configuration angle is distributed along meridional channel, difference then between the one-period area of annular that is rotarily formed of meridional channel and reality circumference area is blade, blade mean camber line is identical with channel center wire shaped, and two sections vane thickness is identical;
5) section blades correction
After completing n-1 unit channel design according to step 4), all there are two values in all the other section blades thickness except cross section 1 and cross section n, and the mean value getting both is the vane thickness in this cross section; After above-mentioned process, determine the blade shape in n cross section, then obtain a series of blade profiles comprising torsional characteristics; Cut out each cross section and be less than step 2) in the blade of respective cross-section meridional channel leading edge inlet diameter, by each blade inlet edge again rounding, obtain a series of blade profile;
6) plunder turn round primary blades and splitterr vanes design generate
Blade profile on the n of an acquisition cross section is fitted to three-dimensional and plunders twisted blade, intercept the blade of blade trailing edge to length place, front 30% ~ 80%, thinning formation splitterr vanes, complete and plunder twisted blade formula diffuser Design.
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| CN116753190B (en) * | 2023-08-23 | 2024-03-22 | 江苏乐科节能科技股份有限公司 | Tandem centrifugal compressor impeller with middle static blade grid |
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| JP3752210B2 (en) * | 2002-08-30 | 2006-03-08 | 三菱重工業株式会社 | Centrifugal compressor, diffuser blade, and manufacturing method thereof |
| US8016557B2 (en) * | 2005-08-09 | 2011-09-13 | Praxair Technology, Inc. | Airfoil diffuser for a centrifugal compressor |
| US7448852B2 (en) * | 2005-08-09 | 2008-11-11 | Praxair Technology, Inc. | Leaned centrifugal compressor airfoil diffuser |
| CN101363452A (en) * | 2008-09-16 | 2009-02-11 | 南京航空航天大学 | Conformality passage type diffuser and three-dimensional design method thereof |
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