CN104537165A - Radial diffuser with groove structure and design method of radial diffuser - Google Patents
Radial diffuser with groove structure and design method of radial diffuser Download PDFInfo
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- CN104537165A CN104537165A CN201410797350.5A CN201410797350A CN104537165A CN 104537165 A CN104537165 A CN 104537165A CN 201410797350 A CN201410797350 A CN 201410797350A CN 104537165 A CN104537165 A CN 104537165A
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- radial stator
- radial diffuser
- groove
- radial
- velocity profile
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Abstract
The invention provides a radial diffuser with a groove structure and a design method of the radial diffuser. The radial diffuser comprises a front cover plate, blades, grooves and a rear cover plate. Blade working faces and blade rear faces are communicated through the grooves. Fixed constant numerical simulation is conduced on the radial diffuser through computational fluid mechanics software ANSYS CFX 14.5, a speed flow line distribution diagram of all passageways in the radial diffuser is acquired, and then the radial diffuser with the grooves is designed. Numerical stimulation is conducted on the radial diffuser with the grooves, the speed flow line distribution diagram of the radial diffuser is acquired, whether the grooves are improved or not is analyzed, and if the grooves are not obviously improved, the grooves are improved according to the speed flow line distribution diagram again till the effect is obvious. The vortex region of the working face of the radial diffuser is reduced, the internal flow field distribution of the radial diffuser is improved, and therefore the discharge capacity of the radial diffuser is improved. The radial diffuser with the groove structure is simple in structure, the groove structure can be designed in the radial diffuser mold manufacturing process, and high practicality is achieved.
Description
Technical field
The invention belongs to centrifugal pump field, especially relate to a kind of radial stator and method for designing thereof of grooved configuration.
Background technology
Radial stator is between impeller and spiral case, widespread use in guide-vane single-stage centrifugal pump in the fields such as nuclear power pump, radial stator converts the kinetic energy of the fluid obtaining high energy from impeller to pressure energy, reduce fluid to the impulsive force of spiral case, in addition also for the multistage centrifugal pump in the fields such as desalinization, radial stator reduces the speed of fluid, can eliminate the velocity circulation of fluid, thus can reduce hydraulic loss when fluid enters next stage impeller.Such as, but there is very complicated flow characteristics in stator, Secondary Flow, flowing shunting etc., produce large hydraulic loss, show according to related data, the hydraulic loss in stator accounts for about 40% of hydraulic loss in pump.
In field of fluid machinery, existing correlation theory confirms that fluting can improve impeller internal flow preferably on pump impeller blade.The patent " groove suction vane for pump " of such as patent No. CN200910052014.7 proposes a kind of blade wheel structure of open channels on blade, effectively can eliminate separation flow, realizes pump and improves in the performance of wider operating condition.The patent " a kind of diffuser with the drag reduction hole, whirlpool that disappears " of the patent No. 201410300154.2 proposes the spatial guide blade in a kind of perforate on blade, can reduce Secondary Flow and whirlpool, reduces hydraulic loss.
But, improving in radial stator centrifugal pump in stator internal flow research, the patent of radial guiding leaf blade notching construction and design thereof is not being appeared in the newspapers.
Summary of the invention
For Shortcomings in prior art, the invention provides a kind of radial stator and method for designing thereof of grooved configuration, to reduce the whirlpool region occurred at stator workplace, improve the distribution of stator interior flow field, thus improve the conveyance capacity of radial stator, and then improve the efficiency of pump.
The present invention realizes above-mentioned technical purpose by following technological means.
A method for designing for the radial stator of grooved configuration, comprises radial stator, has following steps:
(1) adopt cfdrc ANSYS CFX 14.5 to carry out steady numerical simulation to described radial stator, obtain the velocity profile distribution plan of all runners in radial stator;
(2) the velocity profile distribution plan described in read step (1) mark number and the position of whirlpool in described velocity profile distribution plan, determines number and the position of the groove of described radial stator;
(3) the velocity profile distribution plan described in read step (1) mark outermost layer long axis length L and the flow direction of whirlpool in described velocity profile distribution plan, determine the size and Orientation of described groove, radial stator described in step (1) is slotted; Obtain the radial stator of trough of belt;
(4) numerical simulation is carried out to the radial stator of trough of belt described in step (3), obtain its velocity profile distribution plan, analyze and whether improve; If improve not obvious, then again turn back to step (3), the size and Orientation of groove is improved, until Be very effective.
Further, the number of described groove equals the number of whirlpool.
Further, cross the vertical line b that the phase tangent plane of front side of vane is made at whirlpool center, the blade of this vertical line b and radial stator intersects at an A, and described slot is in an A place.
Further, the cross section of described groove is rectangle; The width of described groove is (1/12 ~ 1/10) L, and the height of described groove is 1-3 times of width.
Further, the wide of described groove is 0.5 ~ 5mm, and height is 3 ~ 12mm.
Further, the blade outboard face of described radial stator is front side of vane, has an angle along described in runner direction between groove and the phase tangent plane of front side of vane, and described angle is 20 ° ~ 45 °.
Beneficial effect of the present invention:
(1) the present invention adopts cfdrc ANSYS CFX 14.5 to obtain velocity profile distribution plan to after former radial stator steady numerical simulation, and then the groove structure designed on stator blade, the whirlpool region that front side of vane is occurred flow to vacuum side of blade by described groove, does not affect the flowing of vacuum side of blade simultaneously; The reduction of whirlpool region area effectively improves the fluid flowing of front side of vane, improves the conveyance capacity of radial stator, and then improves the operational efficiency of pump.
(2) the groove structure gone out designed by the present invention is simple, easy to operate, easily can complete, have stronger practicality in radial stator die manufacture.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the radial stator of grooved configuration of the present invention.
Fig. 2 is the schematic diagram of described groove structure.
Fig. 3 be multistage centrifugal pump radial stator in the velocity profile distribution plan of a runner.
Fig. 4 is that in embodiment 1, angle is the velocity profile distribution plan of a runner in the radial stator of trough of belt of 20 °.
Fig. 5 is that in embodiment 1, angle is the velocity profile distribution plan of a runner in the radial stator of trough of belt of 30 °.
Fig. 6 be single-stage centrifugal pump radial stator in the velocity profile distribution plan of a runner.
Fig. 7 is that in embodiment 2, angle is the velocity profile distribution plan of a runner in the radial stator of trough of belt of 25 °.
Description of reference numerals is as follows:
1-front shroud, 2-vacuum side of blade, 3-blade, 4-groove, 5-front side of vane, 6-back shroud, 7-angle, 8-blade exit.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the present invention is further illustrated, but protection scope of the present invention is not limited to this.
Embodiment 1:
The radial stator of cfdrc ANSYS CFX 14.5 pairs of multistage centrifugal pumps is adopted to carry out steady numerical simulation, obtain the velocity profile distribution plan of all runners in stator, reading speed streamline distribution figure also marks the number of whirlpool in described velocity profile distribution plan, position, outermost layer long axis length L and the flow direction, determine the number of groove 4, position, size and Orientation thus, described radial stator slots 4, obtains the radial stator of trough of belt 4.
As shown in Figure 1, the radial stator of described trough of belt 4 comprises front shroud 1, blade 3 and back shroud 6, and groove 4 is communicated with front side of vane 5 and vacuum side of blade 2.Because there are 8 whirlpool regions in the radial guiding tip speed streamline distribution figure of multistage centrifugal pump, and whirlpool region occurs in front side of vane 5 and near blade exit 8, therefore on 8 blades 3 occurring whirlpool region, designs 8 grooves 4.Groove 4 is near front shroud 1 and the 1/3 length of blade place be positioned at apart from blade exit 8.As shown in Figure 2, the cross section of groove 4 is rectangle, is angle 7 between groove 4 and the phase tangent plane of front side of vane 5.Getting described angle 7 is 20 °, and groove 4 wide is 0.8mm, is highly 2mm, designs the radial stator of trough of belt 4 thus.
By the radial stator of trough of belt 4 in embodiment 1 by numerical simulation, obtain velocity profile distribution plan.By comparison diagram 3 and Fig. 4, therefrom can find out, the whirlpool region area of front side of vane 5 does not significantly improve; Adjustment angle 7 is 30 °, and width is 3mm, is highly 4mm, other parameter constants, obtains the trough of belt stator that angle 7 is 30 °, by its numerical simulation, obtains velocity profile distribution plan.Comparison diagram 3 and Fig. 5, the flowing in front side of vane 5 region improves, whirlpool region area significantly reduces, front side of vane 5 produce whirlpool owing to having higher static pressure, vacuum side of blade 2 is flow to by groove 4, do not affect the flowing of vacuum side of blade 2 simultaneously, improve the conveyance capacity of radial stator, and then improve the operational efficiency of pump.
Embodiment 2:
The radial stator of cfdrc ANSYS CFX 14.5 pairs of single-stage centrifugal pump is adopted to carry out steady numerical simulation, obtain the velocity profile distribution plan of all runners in stator, reading speed streamline distribution figure also marks the number of whirlpool in described velocity profile distribution plan, position, outermost layer long axis length L and the flow direction, determine the number of groove 4, position, size and Orientation thus, described radial stator slots 4, obtains the radial stator of trough of belt 4.
Because radial stator internal memory is in 5 whirlpool regions, and whirlpool region occurs in front side of vane and near blade exit 8, therefore on 5 blades 3 occurring whirlpool region, opens 5 grooves 4.Groove 4 is near front shroud 1 and the 1/4 length of blade place be positioned at apart from blade exit 8; Described angle 7 is 25 °, and the cross section of groove 4 is the rectangle of wide 5mm, high 8mm.
By the radial stator of trough of belt 4 described in embodiment 2 by numerical simulation, obtain velocity profile distribution plan.Cross comparison diagram 5 and Fig. 6, therefrom can find out, the flowing in front side of vane 5 region improves, and whirlpool region area significantly reduces, and improves the conveyance capacity of radial stator, and then improves the operational efficiency of pump.
Described embodiment is preferred embodiment of the present invention; but the present invention is not limited to above-mentioned embodiment; when not deviating from flesh and blood of the present invention, any apparent improvement that those skilled in the art can make, replacement or modification all belong to protection scope of the present invention.
Claims (6)
1. a method for designing for the radial stator of grooved configuration, comprises radial stator, it is characterized in that, following steps:
(1) adopt cfdrc ANSYS CFX 14.5 to carry out steady numerical simulation to described radial stator, obtain the velocity profile distribution plan of all runners in radial stator;
(2) the velocity profile distribution plan described in read step (1) mark number and the position of whirlpool in described velocity profile distribution plan, determines number and the position of the groove (4) of described radial stator;
(3) the velocity profile distribution plan described in read step (1) mark outermost layer long axis length L and the flow direction of whirlpool in described velocity profile distribution plan, determine the size and Orientation of described groove (4), slot (4) on radial stator described in step (1) afterwards, obtain the radial stator of trough of belt (4);
(4) numerical simulation is carried out to the radial stator of trough of belt (4) described in step (3), obtains its velocity profile distribution plan, analyze whirlpool region whether be improved significantly; If improve not obvious, then again turn back to step (3), the size and Orientation of groove (4) is improved, until Be very effective.
2. the method for designing of the radial stator of grooved configuration according to claim 1, is characterized in that, the number of described groove (4) equals the number of whirlpool.
3. the method for designing of the radial stator of grooved configuration according to claim 1, it is characterized in that, cross the vertical line b that the phase tangent plane of front side of vane (5) is made at whirlpool center, described vertical line b and blade intersect at an A, and described groove (4) is positioned at an A place.
4. the method for designing of the radial stator of grooved configuration according to claim 1, is characterized in that, the cross section of described groove (4) is rectangle; The width of described groove (4) is (1/12 ~ 1/10) L, and the height of described groove (4) is 1-3 times of width.
5. the method for designing of the radial stator of grooved configuration according to claim 3, is characterized in that, described groove (4) width is 0.5 ~ 5mm, is highly 3 ~ 12mm.
6. the method for designing of the radial stator of grooved configuration according to claim 1 and 2, it is characterized in that, the blade outboard face of described radial stator is front side of vane (5), have an angle (7) along described in runner direction between groove (4) and the phase tangent plane of front side of vane (5), described angle (7) is 20 ° ~ 45 °.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410797350.5A CN104537165B (en) | 2014-12-19 | 2014-12-19 | The radial vane and its design method of a kind of grooved configuration |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410797350.5A CN104537165B (en) | 2014-12-19 | 2014-12-19 | The radial vane and its design method of a kind of grooved configuration |
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| CN104537165A true CN104537165A (en) | 2015-04-22 |
| CN104537165B CN104537165B (en) | 2018-01-16 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105485057A (en) * | 2015-12-25 | 2016-04-13 | 江苏大学 | Hydraulic design method of radial guide blade of diagonal flow pump |
| CN106250606A (en) * | 2016-07-27 | 2016-12-21 | 扬州大学 | A kind of low lift model pump blade angle measures method for digitizing |
| CN108256185A (en) * | 2018-01-03 | 2018-07-06 | 西安交通大学 | A kind of radial velocity component methods of exhibiting for multi-wing centrifugal fan impeller inlet face |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103291653A (en) * | 2013-06-24 | 2013-09-11 | 江苏大学 | Low-specific-speed impeller and design method for blade thereof |
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2014
- 2014-12-19 CN CN201410797350.5A patent/CN104537165B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103291653A (en) * | 2013-06-24 | 2013-09-11 | 江苏大学 | Low-specific-speed impeller and design method for blade thereof |
Non-Patent Citations (2)
| Title |
|---|
| 刘威 等: "《叶片开槽对低比转数离心泵内部流动的影响》", 《排灌机械工程学报》 * |
| 张金凤 等: "《分流叶片离心泵非定常流动及动力学特性分析》", 《振动与冲击》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105485057A (en) * | 2015-12-25 | 2016-04-13 | 江苏大学 | Hydraulic design method of radial guide blade of diagonal flow pump |
| CN105485057B (en) * | 2015-12-25 | 2019-02-22 | 江苏源泉泵业股份有限公司 | A kind of Hydraulic Design Method of diagonal pumps radial vane |
| CN106250606A (en) * | 2016-07-27 | 2016-12-21 | 扬州大学 | A kind of low lift model pump blade angle measures method for digitizing |
| CN106250606B (en) * | 2016-07-27 | 2017-06-23 | 扬州大学 | A kind of low lift model pump blade angle measures method for digitizing |
| CN108256185A (en) * | 2018-01-03 | 2018-07-06 | 西安交通大学 | A kind of radial velocity component methods of exhibiting for multi-wing centrifugal fan impeller inlet face |
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| CN104537165B (en) | 2018-01-16 |
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Inventor after: Wang Wenjie Inventor after: Pei Ji Inventor after: Yuan Shouqi Inventor after: Zhang Jinfeng Inventor after: Meng Fan Inventor after: Chen Jia Inventor before: Wang Wenjie Inventor before: Yuan Shouqi Inventor before: Pei Ji Inventor before: Zhang Jinfeng Inventor before: Meng Fan Inventor before: Chen Jia |
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Granted publication date: 20180116 Termination date: 20181219 |