CN115859534B - Backward bending guide vane grille for air conditioner outdoor unit and design method and design device thereof - Google Patents
Backward bending guide vane grille for air conditioner outdoor unit and design method and design device thereof Download PDFInfo
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- 238000005452 bending Methods 0.000 title claims abstract description 111
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- 238000009434 installation Methods 0.000 claims description 6
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- 238000012938 design process Methods 0.000 description 6
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- 238000011960 computer-aided design Methods 0.000 description 2
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Abstract
The invention relates to the technical field of fans, in particular to a backward bending guide vane grille for an air conditioner outdoor unit, and a design method and a design device thereof. A design method of a backward bending guide vane grille for an air conditioner outdoor unit comprises the following steps: step A, two-dimensional airfoil design: the radius of the cylindrical surface corresponding to the curved surface of the blade top is recorded as
The radius of the cylindrical surface corresponding to the curved surface of the blade root is recorded as
Wherein
The cylindrical surface corresponding to the curved surface of the blade top and the cylindrical surface corresponding to the curved surface of the blade root are coaxially arranged, a space rectangular coordinate system is established, and the axis of the cylinder where the cylindrical surface is located is the Z axis. According to the design method of the backward bending guide vane grille for the air conditioner outdoor unit, the static pressure efficiency, the compression resistance and the wind volume of the air conditioner outdoor unit can be improved, pneumatic noise of the air conditioner outdoor unit is effectively reduced, and the problems that the wind volume is reduced and the wind outlet noise is increased due to the wind outlet grille of the existing air conditioner outdoor unit are solved.
Description
Technical Field
The invention relates to the technical field of fans, in particular to a backward bending guide vane grille for an air conditioner outdoor unit, and a design method and a design device thereof.
Background
In the existing air conditioner outdoor unit, an air outlet grille is required to be arranged at an outlet of the outdoor unit due to safety requirements, when an axial flow fan blade of the air conditioner outdoor unit rotates, high-speed air flow at the top of the fan blade flows out from the tail edge of the fan blade and then directly impacts the grille, so that the air outlet quantity of an air channel of the outdoor unit is reduced, and meanwhile, the pneumatic noise of the outdoor unit is increased. Therefore, the structure and performance optimization of the air outlet grille is important in the high-efficiency low-noise design of the whole air conditioner. In the prior art, the shape of air-out guide vane grid is mainly circular, and circular grid includes a plurality of radial ribs along radius radiation and is the circumference rib that concentric ring set up, radial rib and circumference rib intercrossing on the coplanar, and annular circumference rib can cause the hindrance to the air-out in wind channel for the amount of wind reduces, the air-out noise increases.
Disclosure of Invention
The invention aims to solve the problems of static pressure efficiency, compression resistance and wind capacity of an air conditioner outdoor unit, effectively reduce pneumatic noise of the air conditioner outdoor unit and solve the problems of reduced wind quantity and increased wind noise caused by the wind outlet grille of the existing air conditioner outdoor unit.
The invention further provides the backward bending guide vane grille for the air conditioner outdoor unit, which is designed by using the design method of the backward bending guide vane grille for the air conditioner outdoor unit, and has the advantages of improving the static pressure efficiency, the compression resistance and the wind volume of the air conditioner outdoor unit and effectively reducing the pneumatic noise of the air conditioner outdoor unit.
The invention further aims to provide the design device for executing the design method of the backward bending guide vane grating for the air conditioner outdoor unit, wherein the design process can be optimized according to specific working conditions, and the whole design process adopts computer-aided design, so that the manual error is reduced, the design efficiency is improved, and the parameter is conveniently adjustable.
To achieve the purpose, the invention adopts the following technical scheme:
a design method of a backward bending guide vane grille for an air conditioner outdoor unit comprises the following steps:
step A, two-dimensional airfoil design: radius of cylindrical surface corresponding to curved surface of blade topIs marked as
The radius of the cylindrical surface corresponding to the curved surface of the blade root is marked as +.>
, wherein />
The cylindrical surface corresponding to the curved surface of the blade top and the cylindrical surface corresponding to the curved surface of the blade root are coaxially arranged, a space rectangular coordinate system is established, the axis of the cylinder where the cylindrical surface is positioned is the Z axis, and the radius is equal to ∈10>
Become->
Intersecting the coaxial cylindrical surfaces of the guide vane grating with the backward bending to form a plurality of intersecting surfaces, and expanding the intersecting surfaces along the YOZ plane to obtain a plurality of spread cross sections, wherein each cross section is a two-dimensional airfoil, and the two-dimensional airfoil consists of a leading edge curve, a pressure surface curve, a suction surface curve and a trailing edge curve;
step B, circumferential stacking of two-dimensional wing profiles at high sections of different blades: determining the stacking points of the two-dimensional wing profiles at the high sections of each different blade, forming stacking lines according to the stacking points of the two-dimensional wing profiles at the high sections of each different blade, and performing circumferential stacking of the two-dimensional wing profiles at the high sections of the different blades to obtain backward bent blades;
step C, dislocation installation of blades: in the backward bending guide vane grille, the blades are radially decomposed into a plurality of parts according to different blade heights, each part is respectively a grille blade group, and the hub is provided with a radius of
An annular circumferential rib is arranged between each grid blade group, blades of each grid blade group are arranged on the circumferential rib, the number of blades of each grid blade group and the phase angle of the initial blade are arranged, the number of blades in different grid blade groups is unequal, and the phases of the initial blades in different grid blade groups are equalThe angles of position are unequal, so that the blades of two adjacent grid blade groups are arranged in a staggered manner along the circumferential direction of the backward bending guide vane grid;
step D, circumferential non-uniform distribution of the blades is set: and C, adjusting the positions of blades in each grid blade group after decomposition in the step C according to a sinusoidal modulation function, so that the blades in each grid blade group are distributed in an annular unequal interval along the circumferential direction of the backward bending guide vane grid, and the backward bending guide vane grid for the air conditioner outdoor unit is obtained.
Further more, in the step a, the suction surface and the pressure surface are cubic B-spline curves with four control points, and the leading edge curve and the trailing edge curve are semicircular arcs respectively;
the control points of the suction surface are respectively
and />
The control points of the pressure surfaces are respectively +.>
and />
Wherein line segment->
And line segment->
Parallel, line segment->
And line segment->
Parallel, line segment->
And line segment->
Parallel to each other;
line segment
Defined as chord line, line segment->
Length of (2)LDefined as chord length, line segment +.>
The angle with the chord line is defined as inlet air flow angle +.>
Line segment +.>
The angle with the chord line is defined as outlet air flow angle +.>
The complementary angle of the angle between the direction of the air flow and the chord line is defined as the blade profile mounting angle +.>
，/>
。
Further described, in the step A, 6mm is less than or equal toL≤10mm，
，/>
。
Further described, the diameter of the circular arc defining the leading edge curve
And chord lengthLThe ratio of (2) is the leading edge coefficient +.>
Circular arc diameter defining trailing edge curve +.>
The ratio to chord length L is the trailing edge coefficient +.>
, wherein />
And->
，
。
Further described, a pressure surface and a chord line are definedLThe maximum value of the straight line distance between the two is
Definitions->
And chord lengthLThe ratio of (2) is the camber->
，/>
。
Further describing, in the step B, the stacking points of the two-dimensional airfoil at each of the different blade high sections are determined, and the method for forming the stacking line according to the stacking points of the two-dimensional airfoil at each of the different blade high sections is as follows:
taking the corresponding point on the chord line and the maximum camber of the two-dimensional airfoil as an overlapping point, and forming an overlapping line according to the overlapping point of the two-dimensional airfoil at each different blade high section;
the stacking line adopts a second-order B spline curve with three control points, and the control points at the blade root are
The control point at the leaf top is +.>
The back bending angle is->
The distance between the root control point and the tip control point is +.>
, wherein ：
wherein ,
；
defining the maximum value of the vertical distance between the stacking line and the connecting line of the blade root control point and the blade top control point as the deflection of the stacking line
，/>
After the back bending angle and the deflection of the stacking line are determined, the stacking line is uniquely determined.
Further, in the step C, the blades are decomposed into n parts according to different blade heights in the circumferential direction, where n=4 to 7.
Further described, in step D, the phase angles of the blades in each section satisfy the following sinusoidal modulation function:
wherein ,
is->
Phase angle of non-uniform distribution of part of the blades, +.>
Is->
Phase angle of even distribution of partial blades, +.>
For leaf serial number>
For the phase angle adjustment of the blade, wherein +.>
。
The back bending guide vane grille for the air conditioner outdoor unit is designed by using a design method of the back bending guide vane grille for the air conditioner outdoor unit and comprises a hub, a plurality of circumferential ribs and a plurality of grille blade groups, wherein the plurality of grille blade groups are concentrically and annularly arranged on the periphery of the hub;
the grid blade group comprises a plurality of blades which are radially arranged along the circumferential direction of the backward bending guide vane grid, the blades of two adjacent grid blade groups are arranged in a staggered manner along the circumferential direction of the backward bending guide vane grid, and the blades in the same grid blade group are distributed in an annular unequal interval along the circumferential direction of the backward bending guide vane grid;
the circumferential ribs are annular, a plurality of circumferential ribs are arranged coaxially, and the circumferential ribs are arranged between two adjacent grid blade groups.
A design device of a backward bending guide vane grille for an air conditioner outdoor unit is used for executing the design method of the backward bending guide vane grille for the air conditioner outdoor unit, and comprises the following steps:
the two-dimensional airfoil design module is used for marking the radius of the cylindrical surface corresponding to the curved surface of the blade tip as
The radius of the cylindrical surface corresponding to the curved surface of the blade root is marked as +.>
, wherein />
The cylindrical surface corresponding to the curved surface of the blade top and the cylindrical surface corresponding to the curved surface of the blade root are coaxially arranged, a space rectangular coordinate system is established, the axis of the cylinder where the cylindrical surface is positioned is the Z axis, and the radius is equal to ∈10>
Become->
Intersecting the coaxial cylindrical surfaces of the guide vane grating with the backward bending to form a plurality of intersecting surfaces, and expanding the intersecting surfaces along the YOZ plane to obtain a plurality of spread cross sections, wherein each cross section is a two-dimensional airfoil, and the two-dimensional airfoil consists of a leading edge curve, a pressure surface curve, a suction surface curve and a trailing edge curve;
the circumferential stacking module of the two-dimensional wing profile is used for determining stacking points of the two-dimensional wing profile at each different blade high section, forming stacking lines according to the stacking points of the two-dimensional wing profile at each different blade high section, and performing circumferential stacking of the two-dimensional wing profile at each different blade high section to obtain a backward bent blade;
the staggered mounting module of the blades is used for dividing the blades into a plurality of parts according to different blade heights in the radial direction in the backward bending guide vane grating, each part is respectively a grating blade group, and the hub is provided with a radius of
The method comprises the steps that annular circumferential ribs are arranged between each grid blade group, blades of each grid blade group are arranged on the circumferential ribs, the number of the blades of each grid blade group and the phase angle of an initial blade are arranged, the number of the blades in different grid blade groups are unequal, the phase angles of the initial blades in different grid blade groups are unequal, and the blades of two adjacent grid blade groups are arranged in a staggered mode along the circumferential direction of a backward bending guide vane grid;
and C, adjusting the positions of the blades in each grid blade group after decomposition according to the sinusoidal modulation function, so that the blades in each grid blade group are distributed in an annular unequal interval along the circumferential direction of the backward bending guide vane grid, and the backward bending guide vane grid for the air conditioner outdoor unit is obtained.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
through carrying out the design of two-dimensional wing section earlier, carry out the circumference stacking of two-dimensional wing section department at different leaf high cross-sections again, obtain the blade of backward bending, can carry out parameterized pneumatic design to three-dimensional leaf profile in the design process, improve the aerodynamic performance and the compressive resistance of backward bending guide vane grid. According to the design method, the blades are decomposed into multiple parts along the radial direction according to different blade heights, the decomposed blades are installed in each grid blade group in a staggered mode, the positions of the blades in each grid blade group are adjusted according to a sine modulation function, the blades in each grid blade group are distributed at annular unequal intervals (non-uniform) along the circumferential direction of the backward bending guide vane grid, discrete noise caused by airflow impact to the backward bending guide vane grid can be reduced, and noise reduction treatment is achieved. The invention adopts a ternary design method based on primitive level concept, can design the backward bending guide vane grille for the air conditioner outdoor unit matched with the axial flow fan blade of the air conditioner outdoor unit, can eliminate the rotating air flow flowing through the fan blade, converts the rotating kinetic energy of the air flow into static pressure, can reduce the loss of the rotating kinetic energy of the air flow, improves the static pressure efficiency, the compression resistance and the wind volume of the air conditioner outdoor unit, effectively reduces the pneumatic noise of the air conditioner outdoor unit, has great application value, and solves the problems of reduced air volume and increased air outlet noise caused by the air outlet grille of the existing air conditioner outdoor unit.
Drawings
FIG. 1 is a schematic illustration of a step A two-dimensional airfoil design of a method of designing a backward curved guide vane grille for an air conditioning outdoor unit according to one embodiment of the present invention;
fig. 2 is a schematic view of a circumferentially curved stacking line in step B of a design method of a backward bending guide vane grille for an air conditioner outdoor unit according to an embodiment of the present invention;
fig. 3 is a three-dimensional view of a two-dimensional airfoil laminated into a backward curved blade in step B of a design method of a backward curved guide vane grille for an air conditioner outdoor unit according to an embodiment of the present invention;
FIG. 4 is a schematic view of a blade arrangement (each black dot represents a mounting position of a blade) in step C of a design method of a backward bending guide vane grille for an outdoor unit of an air conditioner according to an embodiment of the present invention;
fig. 5 is a schematic view of a phase angle of blade setting (each black dot represents a mounting position of a blade) in step D of a design method of a backward bending guide vane grille for an air conditioner outdoor unit according to an embodiment of the present invention;
fig. 6 is a schematic perspective view of a backward bending guide vane grille for an outdoor unit of an air conditioner according to an embodiment of the present invention;
fig. 7 is a schematic front view of a backward bending guide vane grille for an outdoor unit of an air conditioner according to an embodiment of the present invention;
in the accompanying drawings: hub 1, circumferential rib 2, grille vane set 3, vanes 31.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the invention. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly, for distinguishing between the descriptive features, and not sequentially, and not lightly.
In the description of the present invention, unless otherwise indicated, the meaning of "plurality" is two or more.
A design method of a backward bending guide vane grille for an air conditioner outdoor unit comprises the following steps:
step A, two-dimensional airfoil design: the radius of the cylindrical surface corresponding to the curved surface of the blade top is recorded as
The radius of the cylindrical surface corresponding to the curved surface of the blade root is marked as +.>
, wherein />
The cylindrical surface corresponding to the curved surface of the blade top and the cylindrical surface corresponding to the curved surface of the blade root are coaxially arranged, a space rectangular coordinate system is established, the axis of the cylinder where the cylindrical surface is positioned is the Z axis, and the radius is equal to ∈10>
Become->
Intersecting the coaxial cylindrical surfaces of the guide vane grating with the backward bending to form a plurality of intersecting surfaces, and expanding the intersecting surfaces along the YOZ plane to obtain a plurality of spread cross sections, wherein each cross section is a two-dimensional airfoil, and the two-dimensional airfoil consists of a leading edge curve, a pressure surface curve, a suction surface curve and a trailing edge curve;
step B, circumferential stacking of two-dimensional wing profiles at high sections of different blades: determining the stacking points of the two-dimensional wing profiles at the high sections of each different blade, forming stacking lines according to the stacking points of the two-dimensional wing profiles at the high sections of each different blade, and performing circumferential stacking of the two-dimensional wing profiles at the high sections of the different blades to obtain backward bent blades;
step C, dislocation installation of blades: in the backward bending guide vane grille, the blades are radially decomposed into a plurality of parts according to different blade heights, each part is respectively a grille blade group, and the hub is provided with a radius of
Annular circumferential ribs are arranged between each grid blade group, blades of each grid blade group are arranged on the circumferential ribs, and the annular circumferential ribs are arrangedThe number of blades of each grid blade group is not equal to the phase angle of the initial blade, and the number of blades of different grid blade groups are not equal to the phase angle of the initial blade in different grid blade groups, so that the blades of two adjacent grid blade groups are arranged in a staggered manner along the circumferential direction of the backward bending guide vane grid;
step D, circumferential non-uniform distribution of the blades is set: and C, adjusting the positions of blades in each grid blade group after decomposition in the step C according to a sinusoidal modulation function, so that the blades in each grid blade group are distributed in an annular unequal interval along the circumferential direction of the backward bending guide vane grid, and the backward bending guide vane grid for the air conditioner outdoor unit is obtained.
According to the design method of the backward bending guide vane grille for the air conditioner outdoor unit, the backward bending guide vane grille is obtained by firstly designing the two-dimensional wing profile and then circumferentially stacking the two-dimensional wing profiles at the high sections of different blades, and the three-dimensional blade profile can be subjected to parameterized pneumatic design in the design process, so that the pneumatic performance and the compression resistance of the backward bending guide vane grille are improved. According to the design method, the blades are decomposed into multiple parts along the radial direction according to different blade heights, the decomposed blades are installed in each grid blade group in a staggered mode, the positions of the blades in each grid blade group are adjusted according to a sine modulation function, the blades in each grid blade group are distributed at annular unequal intervals (non-uniform) along the circumferential direction of the backward bending guide vane grid, discrete noise caused by airflow impact to the backward bending guide vane grid can be reduced, and noise reduction treatment is achieved. The invention adopts a ternary design method based on primitive level concept, can design the backward bending guide vane grille for the air conditioner outdoor unit matched with the axial flow fan blade of the air conditioner outdoor unit, can eliminate the rotating air flow flowing through the fan blade, converts the rotating kinetic energy of the air flow into static pressure, can reduce the loss of the rotating kinetic energy of the air flow, improves the static pressure efficiency, the compression resistance and the wind volume of the air conditioner outdoor unit, effectively reduces the pneumatic noise of the air conditioner outdoor unit, has great application value, and solves the problems of reduced air volume and increased air outlet noise caused by the air outlet grille of the existing air conditioner outdoor unit.
As shown in FIG. 1, in the step A, the suction surface and the pressure surface are respectively cubic B-spline curves with four control points, and the leading edge curve and the trailing edge curve are respectively semicircular arcs;
the control points of the suction surface are respectively
and />
The control points of the pressure surfaces are respectively +.>
and />
Wherein line segment->
And line segment->
Parallel, line segment->
And line segment->
Parallel, line segment->
And line segment->
Parallel to each other;
line segment
Defined as chord line, line segment->
Length of (2)LDefined as chord length, line segment +.>
The angle with the chord line is defined as inlet air flow angle +.>
Line segment +.>
The angle with the chord line is defined as outlet air flow angle +.>
The complementary angle of the angle between the direction of the air flow and the chord line is defined as the blade profile mounting angle +.>
，/>
。
In order to ensure the flow guiding function of the air inlet grille, the complementary angle of the included angle between the air flow direction (axial direction) and the chord line is defined as a blade-shaped installation angle
The tangential velocity of the airflow is converted into the axial velocity (namely the Z-axis direction), so that the outlet airflow angle of the backward bending guide vane grille and the blade-shaped mounting angle are in a complementary relationship, namely +.>
I.e. line segment->
And line segment->
Is arranged along the axial direction.
Preferably, in the step A, the thickness of the film is 6mm less than or equal toL≤10mm，
，/>
。/>
Further described, the diameter of the circular arc defining the leading edge curve
And chord lengthLThe ratio of (2) is the leading edge coefficient +.>
Circular arc diameter defining trailing edge curve +.>
The ratio to chord length L is the trailing edge coefficient +.>
, wherein />
And->
，
。
Make the following steps
The blade profile can be ensured to have a pneumatic structure with blunt leading edge and sharp trailing edge, so that an accelerating flow field is formed near the blade profile. Furthermore, by definition->
and />
The range of the value of the back bending guide vane grating can be avoided, if the blade profile is too thin or too thick, the blade is easy to break, the safe use of the back bending guide vane grating is affected, and if the blade profile is too thick, larger flow loss is caused, and the pneumatic performance of the back bending guide vane grating is affected.
Further described, a pressure surface and a chord line are definedLThe maximum value of the straight line distance between the two is
Definitions->
And chord lengthLThe ratio of (2) is the camber->
，/>
。
By defining a camber
If the bending degree of the blade profile is too small, the acceleration of the airflow is affected, and the compression resistance of the backward bending guide vane grating is insufficient; if the camber of the blade profile is too large, air flow separation occurs at the tail edge of the backward bending guide vane grating, so that air flow loss is caused, and the performance of the backward bending guide vane grating is affected.
The curved blade refers to the inclination of the blade in the circumferential direction (the rotational direction of the blade), wherein the inclination in the forward rotational direction is referred to as a forward curved blade, and the inclination in the reverse rotational direction is referred to as a backward curved blade. In order to create a backward curved blade, it is necessary to circumferentially stack two-dimensional airfoils at different blade high sections. In this embodiment, in the step B, the stacking point of the two-dimensional airfoil at each different blade high section is determined, and the method for forming the stacking line according to the stacking point of the two-dimensional airfoil at each different blade high section is as follows:
taking the corresponding point on the chord line and the maximum camber of the two-dimensional airfoil as an overlapping point, and forming an overlapping line according to the overlapping point of the two-dimensional airfoil at each different blade high section;
the stacking line adopts a second-order B-spline curve with three control points, as shown in figures 2 and 3, the control points at the blade root are
The control point at the leaf top is +.>
The back bending angle is->
The distance between the root control point and the tip control point is +.>
, wherein ：
wherein ,
；
defining the maximum value of the vertical distance between the stacking line and the connecting line of the blade root control point and the blade top control point as the deflection of the stacking line
，/>
After the back bending angle and the deflection of the stacking line are determined, the stacking line is uniquely determined.
Through setting the blade of stator grid to the backward bending blade, the movable vane design of cooperation air condensing units guarantees that the air current is unobstructed to flow out. Because the stacking line adopts a second-order B spline curve with three control points, the three control points can be determined by determining the back bending angle and the deflection of the stacking line, and then the stacking line is uniquely confirmed.
In step C, the blades are decomposed into n parts according to different blade heights in the circumferential direction, n=4 to 7, that is, the blades can be decomposed into 4 to 7 parts according to different blade heights in the circumferential direction, the larger the distance between the blades towards the periphery is, the fingers of an operator are prevented from being clamped between the blades, and the use safety of the backward bending guide vane grating is ensured.
In the step C, as shown in fig. 4, the blades are decomposed into 4 parts according to different blade heights in the circumferential direction, wherein the first part is 0% -25% of the blade height, the second part is 25% -50% of the blade height, the third part is 50% -75% of the blade height, and the fourth part is 75% -100% of the blade height;
number of blades of the first partN 1 =47, phase angle of starting blade ofψ 1 =0°；
Number of blades of the second partN 2 =53, phase angle of starting blade ofψ 2 =3°；
Number of blades of the third partN 3 =61, phase angle of starting blade isψ 3 =6°；
Number of blades of the fourth partN 4 =73, phase angle of starting blade ofψ 4 =9°。
In this embodiment, the blades are decomposed into 4 parts according to different blade heights along the circumferential direction, and the dislocation installation of the decomposed blades in each part is realized by setting the blade numbers of the different parts and the phase angles of the starting blades, specifically, the blade numbers of each part are set to be the number which cannot be divided, so that the blades of each part can be unevenly set, the blades of each part generate an unfixed frequency, noise is reduced, and noise reduction treatment can be realized.
As shown in fig. 5, further describing step D, the phase angles of the blades in each section satisfy the following sinusoidal modulation function:
wherein ,
is->
Phase angle of non-uniform distribution of part of the blades, +.>
Is->
Phase angle of even distribution of partial blades, +.>
For leaf serial number>
For the phase angle adjustment of the blade, wherein +.>
。
Fan noise is generally classified into broadband noise and discrete noise. Broadband noise is derived from the separated flow in the impeller; the discrete noise is caused by periodic fluctuations in blade load and dynamic and static interference of rotating and static components. Wherein the discrete noise is usually dominated by the blade passing frequency and higher harmonics thereof, therefore, one of the noise improvement strategies is to disperse the acoustic energy at the blade passing frequency in a wider frequency range, and therefore, by designing the blades in a non-uniform arrangement, the discrete noise brought by the airflow striking the grille can be reduced. Further, by setting the phase angle adjustment amounts of the different blades, the phase angle can be adjusted, thereby adjusting the distance between the two blades.
As shown in fig. 6 and 7, a backward bending guide vane grille for an air conditioner outdoor unit is designed by using a design method of the backward bending guide vane grille for the air conditioner outdoor unit, and comprises a hub 1, a plurality of circumferential ribs 2 and a plurality of grille blade groups 3, wherein the plurality of grille blade groups 3 are concentrically and annularly arranged on the periphery of the hub 1;
the grid blade group 3 comprises a plurality of blades 31 radially arranged along the circumferential direction of the backward bending guide vane grid, the blades 31 of two adjacent grid blade groups 3 are arranged in a staggered manner along the circumferential direction of the backward bending guide vane grid, and the blades 31 in the same grid blade group 3 are distributed in an annular unequal interval along the circumferential direction of the backward bending guide vane grid;
the circumferential ribs 2 are annular, the circumferential ribs 2 are arranged coaxially, and the circumferential ribs 2 are arranged between two adjacent grid blade groups 3.
The backward bending guide vane grille designed by the design method of the backward bending guide vane grille for the air conditioner outdoor unit has the advantages of improving the static pressure efficiency, the compression resistance and the wind capacity of the air conditioner outdoor unit and effectively reducing the pneumatic noise of the air conditioner outdoor unit, and the air quantity of the air conditioner outdoor unit can be improved by 30-50 m by using the backward bending guide vane grille for the air conditioner outdoor unit 3 And/h, the noise is reduced by 0.5-1.6 dB,has great application value.
Preferably, the thickness of the circumferential rib is 1.2mm.
A design device of a backward bending guide vane grille for an air conditioner outdoor unit is used for executing the design method of the backward bending guide vane grille for the air conditioner outdoor unit, and comprises the following steps:
the two-dimensional airfoil design module is used for marking the radius of the cylindrical surface corresponding to the curved surface of the blade tip as
The radius of the cylindrical surface corresponding to the curved surface of the blade root is marked as +.>
, wherein />
The cylindrical surface corresponding to the curved surface of the blade top and the cylindrical surface corresponding to the curved surface of the blade root are coaxially arranged, a space rectangular coordinate system is established, the axis of the cylinder where the cylindrical surface is positioned is the Z axis, and the radius is equal to ∈10>
Become->
Intersecting the coaxial cylindrical surfaces of the guide vane grating with the backward bending to form a plurality of intersecting surfaces, and expanding the intersecting surfaces along the YOZ plane to obtain a plurality of spread cross sections, wherein each cross section is a two-dimensional airfoil, and the two-dimensional airfoil consists of a leading edge curve, a pressure surface curve, a suction surface curve and a trailing edge curve;
the circumferential stacking module of the two-dimensional wing profile is used for determining stacking points of the two-dimensional wing profile at each different blade high section, forming stacking lines according to the stacking points of the two-dimensional wing profile at each different blade high section, and performing circumferential stacking of the two-dimensional wing profile at each different blade high section to obtain a backward bent blade;
the staggered mounting module of the blades is used for dividing the blades into a plurality of parts according to different blade heights in the radial direction in the backward bending guide vane grating, each part is respectively a grating blade group, and the hub is provided with a radius of
The method comprises the steps that annular circumferential ribs are arranged between each grid blade group, blades of each grid blade group are arranged on the circumferential ribs, the number of the blades of each grid blade group and the phase angle of an initial blade are arranged, the number of the blades in different grid blade groups are unequal, the phase angles of the initial blades in different grid blade groups are unequal, and the blades of two adjacent grid blade groups are arranged in a staggered mode along the circumferential direction of a backward bending guide vane grid;
and C, adjusting the positions of the blades in each grid blade group after decomposition according to the sinusoidal modulation function, so that the blades in each grid blade group are distributed in an annular unequal interval along the circumferential direction of the backward bending guide vane grid, and the backward bending guide vane grid for the air conditioner outdoor unit is obtained.
The design device of the backward bending guide vane grille for the air conditioner outdoor unit is used for designing the backward bending guide vane grille for the air conditioner outdoor unit, parameter optimization can be carried out according to specific working conditions in the design process, and the whole design process adopts computer-aided design, so that the manual error is reduced, the design efficiency is improved, and the parameter is conveniently adjustable.
Example 1
The design method of the backward bending guide vane grating for the air conditioner outdoor unit is adopted to design the backward bending guide vane grating:
step A, two-dimensional airfoil design: the radius of the cylindrical surface corresponding to the curved surface of the blade top is recorded as
The radius of the cylindrical surface corresponding to the curved surface of the blade root is marked as +.>
, wherein />
200mm @ of>
45mm, corresponding to the curved surface of the blade tipThe cylindrical surface corresponding to the curved surface of the blade root is coaxially arranged, a space rectangular coordinate system is established, the axis of the cylinder where the cylindrical surface is positioned is a Z axis, and the radius is from +.>
Become->
Intersecting the coaxial cylindrical surfaces of the guide vane grating with the backward bending to form a plurality of intersecting surfaces, and expanding the intersecting surfaces along the YOZ plane to obtain a plurality of spread cross sections, wherein each cross section is a two-dimensional airfoil, and the two-dimensional airfoil consists of a leading edge curve, a pressure surface curve, a suction surface curve and a trailing edge curve;
in the step A, the suction surface and the pressure surface are respectively cubic B spline curves with four control points, and the leading edge curve and the trailing edge curve are respectively semicircular arcs;
the control points of the suction surface are respectively
and />
The control points of the pressure surfaces are respectively +.>
and />
Wherein line segment->
And line segment->
Parallel, line segment->
And line segment->
Parallel, line segment->
And line segment->
Parallel to each other;
line segment
Defined as chord line, line segment->
Length of (2)LDefined as the chord lengthL10mm, line segment->
The angle with the chord line is defined as inlet air flow angle +.>
Line segment +.>
The angle with the chord line is defined as outlet air flow angle +.>
The complementary angle of the angle between the direction of the air flow and the chord line is defined as the blade profile mounting angle +.>
，/>
In the present embodiment, the blade profile mounting angle
60 DEG inlet air flow angle->
35 DEG, outlet air flow angle->
30 °;
arc diameter defining leading edge curve
And chord lengthLThe ratio of (2) is the leading edge coefficient +.>
Circular arc diameter defining trailing edge curve +.>
The ratio to chord length L is the trailing edge coefficient +.>
, wherein />
Front edge coefficient->
0.03 trailing edge coefficient +.>
0.015;
defining a pressure surface and a chord lineLThe maximum value of the straight line distance between the two is
Definitions->
And chord lengthLThe ratio of (2) is the camber->
，/>
。
Step B, circumferential stacking of two-dimensional wing profiles at high sections of different blades: determining the stacking points of the two-dimensional wing profiles at the high sections of each different blade, forming stacking lines according to the stacking points of the two-dimensional wing profiles at the high sections of each different blade, and performing circumferential stacking of the two-dimensional wing profiles at the high sections of the different blades to obtain backward bent blades;
in said step B, the stacking point of the two-dimensional airfoil at each different blade high section is determined according to each different bladeThe method for forming the stacking line by stacking points of the two-dimensional airfoil shape at the high section of the blade is as follows: taking the corresponding point on the chord line and the maximum camber of the two-dimensional airfoil as an overlapping point, and forming an overlapping line according to the overlapping point of the two-dimensional airfoil at each different blade high section; the stacking line adopts a second-order B spline curve with three control points, and the control points at the blade root are
The control point at the leaf top is +.>
The back bend angle is
The distance between the root control point and the tip control point is +.>
, wherein ：
wherein ,
；
defining the maximum value of the vertical distance between the stacking line and the connecting line of the blade root control point and the blade top control point as the deflection of the stacking line
，/>
After the back bending angle and the deflection of the stacking line are determined, the stacking line is uniquely determined.
Step C, dislocation installation of blades: in the backward bending guide vane grille, the blades are radially decomposed into a plurality of parts according to different blade heights, each part is respectively a grille blade group, and the hub is provided with a radius of
Is arranged between each grid blade groupThe blades of each grid blade group are arranged on the circumferential rib, the number of the blades of each grid blade group and the phase angle of the initial blade are set, the number of the blades in different grid blade groups are unequal, and the phase angles of the initial blades in different grid blade groups are unequal, so that the blades of two adjacent grid blade groups are arranged in a staggered manner along the circumferential direction of the backward bending guide vane grid;
in the step C, the blades are decomposed into 4 parts according to different blade heights along the circumferential direction, wherein the first part is 0% -25% of the blade height, the second part is 25% -50% of the blade height, the third part is 50% -75% of the blade height, and the fourth part is 75% -100% of the blade height;
number of blades of the first partN 1 =47, phase angle of starting blade ofψ 1 =0°；
Number of blades of the second partN 2 =53, phase angle of starting blade ofψ 2 =3°；
Number of blades of the third partN 3 =61, phase angle of starting blade isψ 3 =6°；
Number of blades of the fourth partN 4 =73, phase angle of starting blade ofψ 4 =9°。
Step D, circumferential non-uniform distribution of the blades is set: c, adjusting the positions of blades in each grid blade group after decomposition in the step C according to a sinusoidal modulation function, so that the blades in each grid blade group are distributed in an annular unequal interval along the circumferential direction of the backward bending guide vane grid;
in step D, the phase angles of the blades in each section satisfy the following sinusoidal modulation function:
wherein ,
is->
Phase angle of non-uniform distribution of part of the blades, +.>
Is->
Phase angle of even distribution of partial blades, +.>
For leaf serial number>
For the phase angle adjustment of the blade, wherein +.>
And obtaining the backward bending guide vane grille for the air conditioner outdoor unit.
Comparative example 1
In comparison to example 1, this comparative example eliminates step D of example 1, the blades were not arranged in a non-uniform distribution, and the remaining steps and parameters were consistent with example 1, resulting in a turnback guide vane grid.
Comparative example 2
The grating in this comparative example is a conventional grating, which is a crisscrossed equidistant strip-shaped grating.
The grids of example 1, comparative example 1 and comparative example 2 were tested for air volume, power and noise using the existing test methods, and the test results are shown in the following table:
table 1 results of performance testing of examples and comparative examples
As can be seen from the above table, the backward bending guide vane grille designed by the design method of the backward bending guide vane grille for the air conditioner outdoor unit has lower power than comparative example 1 and comparative example 2, but has higher air volume than comparative example 1 and comparative example 2 and lower noise at the same design rotation speed.
The technical principle of the present invention is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the invention and should not be taken in any way as limiting the scope of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of this specification without undue burden.
Claims (7)
1. The design method of the backward bending guide vane grille for the air conditioner outdoor unit is characterized by comprising the following steps of:
step A, two-dimensional airfoil design: the radius of the cylindrical surface corresponding to the curved surface of the blade top is recorded as
The radius of the cylindrical surface corresponding to the curved surface of the blade root is marked as +.>
, wherein />
The cylindrical surface corresponding to the curved surface of the blade top and the cylindrical surface corresponding to the curved surface of the blade root are coaxially arranged, a space rectangular coordinate system is established, the axis of the cylinder where the cylindrical surface is positioned is the Z axis, and the radius is equal to ∈10>
Become->
Intersecting the coaxial cylindrical surfaces of the guide vane grating with the backward bending to form a plurality of intersecting surfaces, and expanding the intersecting surfaces along the YOZ plane to obtain a plurality of spread cross sections, wherein each cross section is a two-dimensional airfoil, and the two-dimensional airfoil consists of a leading edge curve, a pressure surface curve, a suction surface curve and a trailing edge curve;
step B, circumferential stacking of two-dimensional wing profiles at high sections of different blades: determining the stacking points of the two-dimensional wing profiles at the high sections of each different blade, forming stacking lines according to the stacking points of the two-dimensional wing profiles at the high sections of each different blade, and performing circumferential stacking of the two-dimensional wing profiles at the high sections of the different blades to obtain backward bent blades;
step C, dislocation installation of blades: in the backward bending guide vane grille, the blades are radially decomposed into a plurality of parts according to different blade heights, each part is respectively a grille blade group, and the hub is provided with a radius of
The method comprises the steps that annular circumferential ribs are arranged between each grid blade group, blades of each grid blade group are arranged on the circumferential ribs, the number of the blades of each grid blade group and the phase angle of an initial blade are arranged, the number of the blades in different grid blade groups are unequal, the phase angles of the initial blades in different grid blade groups are unequal, and the blades of two adjacent grid blade groups are arranged in a staggered mode along the circumferential direction of a backward bending guide vane grid;
step D, circumferential non-uniform distribution of the blades is set: c, adjusting the positions of blades in each grid blade group after decomposition in the step C according to a sinusoidal modulation function, so that the blades in each grid blade group are distributed in an annular unequal interval along the circumferential direction of the backward bending guide vane grid, and obtaining the backward bending guide vane grid for the air conditioner outdoor unit;
in the step A, the suction surface and the pressure surface are respectively cubic B spline curves with four control points, and the leading edge curve and the trailing edge curve are respectively semicircular arcs;
the control points of the suction surface are respectively
and />
The control points of the pressure surfaces are respectively +.>
and />
Wherein line segment->
And line segment->
Parallel, line segment->
And line segment->
Parallel, line segment->
And line segment->
Parallel to each other;
line segment
Defined as chord line, line segment->
Length of (2)LDefined as chord length, line segment +.>
The angle with the chord line is defined as inlet air flow angle +.>
Line segment +.>
The angle with the chord line is defined as outlet air flow angle +.>
The complementary angle of the angle between the direction of the air flow and the chord line is defined as the blade profile mounting angle +.>
，/>
；
Defining a pressure surface and a chord lineLThe maximum value of the straight line distance between the two is
Definitions->
And chord lengthLThe ratio of (2) is the camber->
，
；
In the step B, the stacking points of the two-dimensional wing profiles at the high sections of each different leaf are determined, and the method for forming the stacking line according to the stacking points of the two-dimensional wing profiles at the high sections of each different leaf is as follows:
taking the corresponding point on the chord line and the maximum camber of the two-dimensional airfoil as an overlapping point, and forming an overlapping line according to the overlapping point of the two-dimensional airfoil at each different blade high section;
the stacking line adopts a second-order B spline curve with three control points, and the control points at the blade root are
The control point at the top of the leaf is
The back bending angle is->
The distance between the root control point and the tip control point is +.>
, wherein ：
wherein ,
；
defining the maximum value of the vertical distance between the stacking line and the connecting line of the blade root control point and the blade top control point as the deflection of the stacking line
，/>
After the back bending angle and the deflection of the stacking line are determined, the stacking line is uniquely determined.
2. The method for designing a back-curved guide vane grille for an outdoor unit of an air conditioner according to claim 1, wherein in step A, 6mm is less than or equal toL≤10mm，
，/>
。
3. The method for designing a back-curved guide vane grille for an outdoor unit of an air conditioner according to claim 1, wherein a circular arc diameter defining a leading edge curve
And chord lengthLThe ratio of (2) is the leading edge coefficient +.>
Circular arc diameter defining trailing edge curve +.>
The ratio to chord length L is the trailing edge coefficient +.>
, wherein />
And->
，/>
。
4. The method of designing a back-curved guide vane grille for an outdoor unit of an air conditioner according to claim 1, wherein in the step C, the blades are decomposed into n parts according to different blade heights in the circumferential direction, n=4 to 7.
5. The method for designing a back-curved guide vane grille for an outdoor unit of an air conditioner according to claim 1, wherein in the step D, the phase angles of the blades in the respective sections satisfy the following sinusoidal modulation function:
wherein ,
is->
Phase angle of non-uniform distribution of part of the blades, +.>
Is->
Phase angle of even distribution of partial blades, +.>
For leaf serial number>
For the phase angle adjustment of the blade, wherein +.>
。
6. The back bending guide vane grille for the air conditioner outdoor unit is characterized by being designed by using the design method of the back bending guide vane grille for the air conditioner outdoor unit according to any one of claims 1 to 5, and comprises a hub, a plurality of circumferential ribs and a plurality of grille blade groups, wherein the grille blade groups are concentrically and annularly arranged on the periphery of the hub;
the grid blade group comprises a plurality of blades which are radially arranged along the circumferential direction of the backward bending guide vane grid, the blades of two adjacent grid blade groups are arranged in a staggered manner along the circumferential direction of the backward bending guide vane grid, and the blades in the same grid blade group are distributed in an annular unequal interval along the circumferential direction of the backward bending guide vane grid;
the circumferential ribs are annular, a plurality of circumferential ribs are arranged coaxially, and the circumferential ribs are arranged between two adjacent grid blade groups.
7. A design apparatus for a backward bending guide vane grille for an air conditioner outdoor unit, characterized by executing the design method for a backward bending guide vane grille for an air conditioner outdoor unit according to any one of claims 1 to 5, comprising:
the two-dimensional airfoil design module is used for marking the radius of the cylindrical surface corresponding to the curved surface of the blade tip as
The radius of the cylindrical surface corresponding to the curved surface of the blade root is marked as +.>
, wherein />
The cylindrical surface corresponding to the curved surface of the blade top and the cylindrical surface corresponding to the curved surface of the blade root are coaxially arranged, a space rectangular coordinate system is established, the axis of the cylinder where the cylindrical surface is positioned is the Z axis, and the radius is equal to ∈10>
Become->
Intersecting the coaxial cylindrical surfaces of the guide vane grating with the backward bending to form a plurality of intersecting surfaces, and expanding the intersecting surfaces along the YOZ plane to obtain a plurality of spread cross sections, wherein each cross section is a two-dimensional airfoil, and the two-dimensional airfoil consists of a leading edge curve, a pressure surface curve, a suction surface curve and a trailing edge curve;
the circumferential stacking module of the two-dimensional wing profile is used for determining stacking points of the two-dimensional wing profile at each different blade high section, forming stacking lines according to the stacking points of the two-dimensional wing profile at each different blade high section, and performing circumferential stacking of the two-dimensional wing profile at each different blade high section to obtain a backward bent blade;
the staggered mounting module of the blades is used for dividing the blades into a plurality of parts according to different blade heights in the radial direction in the backward bending guide vane grating, each part is respectively a grating blade group, and the hub is provided with a radius of
The method comprises the steps that annular circumferential ribs are arranged between each grid blade group, blades of each grid blade group are arranged on the circumferential ribs, the number of the blades of each grid blade group and the phase angle of an initial blade are arranged, the number of the blades in different grid blade groups are unequal, the phase angles of the initial blades in different grid blade groups are unequal, and the blades of two adjacent grid blade groups are arranged in a staggered mode along the circumferential direction of a backward bending guide vane grid;
and C, adjusting the positions of the blades in each grid blade group after decomposition according to the sinusoidal modulation function, so that the blades in each grid blade group are distributed in an annular unequal interval along the circumferential direction of the backward bending guide vane grid, and the backward bending guide vane grid for the air conditioner outdoor unit is obtained.
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