CN116950924A - Micro-roll curved surface blade tip for blade tip clearance flow control and pump with same - Google Patents

Micro-roll curved surface blade tip for blade tip clearance flow control and pump with same Download PDF

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Publication number
CN116950924A
CN116950924A CN202310931820.1A CN202310931820A CN116950924A CN 116950924 A CN116950924 A CN 116950924A CN 202310931820 A CN202310931820 A CN 202310931820A CN 116950924 A CN116950924 A CN 116950924A
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CN
China
Prior art keywords
blade
micro
roll
curved surface
tip
Prior art date
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Pending
Application number
CN202310931820.1A
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Chinese (zh)
Inventor
谭磊
樊红刚
祝宝山
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Tsinghua University
Shanxi Research Institute for Clean Energy of Tsinghua University
Original Assignee
Tsinghua University
Shanxi Research Institute for Clean Energy of Tsinghua University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tsinghua University, Shanxi Research Institute for Clean Energy of Tsinghua University filed Critical Tsinghua University
Priority to CN202310931820.1A priority Critical patent/CN116950924A/en
Publication of CN116950924A publication Critical patent/CN116950924A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention relates to the technical field of pumps, in particular to a micro-roll curved surface blade tip for controlling blade tip clearance flow and a pump with the same, wherein the micro-roll curved surface blade tip comprises: the thickness of the blade is increased to be close to the top area of the blade in equal proportion at the section of each blade chord along the direction of the blade chord, and the top of the blade is in a curved surface modeling to form a micro-inclined curved surface blade top. The adoption of the micro-inclined curved blade tip is an effective way for inhibiting leakage vortex at a pump gap, improving the hydraulic efficiency of the pump and reducing vibration noise. The micro-roll curved surface blade tip suppresses flow separation on the blade pressure side, reduces the turbulence intensity of a blade tip clearance flow field, thereby reducing the blade tip clearance separation vortex, and the micro-roll on the blade suction side reduces coherent shearing of leakage flow and main flow in the blade tip clearance, thereby suppressing the blade tip clearance leakage vortex, improving the operation efficiency and stability of the pump, reducing flow field pressure pulsation and reducing noise.

Description

Micro-roll curved surface blade tip for blade tip clearance flow control and pump with same
Technical Field
The invention relates to the technical field of pumps, in particular to a micro-roll curved surface blade tip for controlling blade tip clearance flow and a pump with the micro-roll curved surface blade tip.
Background
In the related art, a pump is a general-purpose machine that transfers mechanical energy to a fluid to increase the energy of the fluid for delivering the fluid or pressurizing the fluid. The tip clearance refers to a clearance existing between the tip of the blade and the pump casing, and is unavoidable in an impeller in the pump. Under the action of the pressure difference of the pressure side and the suction side of the blade, leakage vortex induced by the blade tip clearance and main flow in the impeller flow channel are mutually interfered and mixed, so that complex vortex motion in the impeller flow channel and the blade tip clearance is caused. The strong interference of clearance flow and leakage vortex induced by the clearance of the blade tip on the main flow results in deterioration of the flow state inside the impeller and reduction of the functional capacity of the blades, thereby causing increase of pump energy loss and reduction of hydraulic efficiency. Leakage vortex induced by the blade tip clearance causes rapid changes in fluid pressure and speed in the impeller, especially in the blade tip clearance area, and further causes severe pressure pulsation, which has an important influence on the operation stability of the pump.
Leakage vortex generated by the clearance of the impeller inner blade tip has a great influence on the energy loss, the operation efficiency and the stability of the pump, but the control of the leakage vortex is not researched.
Disclosure of Invention
The invention provides a micro-roll curved surface blade tip for blade tip clearance flow control and a pump with the same, so as to avoid the great influence of leakage vortex generated by the blade tip clearance in an impeller on the energy loss, the operation efficiency and the stability of the pump.
An embodiment of a first aspect of the present invention provides a micro-roll curved tip for tip clearance flow control, comprising: and the thickness of the blade is increased to the top area of the blade in equal proportion at the section of each blade chord along the direction of the blade chord, and the top of the blade is in a curved surface modeling to form a micro-inclined curved surface blade top.
Optionally, taking the pressure side of the original blade as an abscissa origin, t, and taking the height of the original blade as an ordinate origin, h, wherein the micro-roll of the blade in the thickness direction is as follows:
will be the abscissa t s0 =δ, ordinate h s0 As a starting position, the blade is slightly inclinedThe top h of the blade s1 Suction force at=0 slightly inclined to the main flow direction to the abscissa maximum value t s1 The micro-roll surface coordinates of the blade obey a quadratic polynomial function distribution law, wherein delta is the original blade thickness.
Optionally, the ordinate h s0 The value range of (2) is-tau to-5.0 tau, the maximum value t of the abscissa s1 The value range of (1) is 1.1 delta to 2 delta, wherein delta is the original blade thickness, and tau is the original blade tip clearance size.
Optionally, the distribution rule of the quadratic polynomial function is:
wherein t is s Is the abscissa of the micro-roll surface, h s Is the ordinate, t, of the micro-roll surface s1 Maximum value of micro-roll abscissa of blade, h s0 Is the ordinate of the initial position of the micro-roll of the blade, delta is the original blade thickness, and theta is the micro-roll surface t s ＝t s1 The included angle between the tangential line and the axis of abscissa is 0-45 deg.
Optionally, the curved surface modeling is:
taking the pressure side of the original blade as the origin of the abscissa t, taking the height of the original blade as the origin of the ordinate h, and taking the abscissa t c0 =0, ordinate h c0 And taking the=0 as a starting position to perform leaf top curved surface modeling, wherein the curved surface leaf top has the highest point P in the range of the leaf thickness, and the leaf top curved surface coordinates obey a cubic polynomial function distribution rule.
Optionally, the highest point P coordinate is (t P ,h P )，t P The value range of (2) is 0 to the maximum value t of the micro-roll abscissa of the blade s1 The maximum value t of the abscissa s1 The value range of (1.1 delta) to (2 delta), h P The value range of (2) is 0.1 tau to 5.0 tau, wherein delta is the original blade thickness, and tau is the original blade tip clearance size.
Optionally, the distribution rule of the third-order polynomial function of the leaf top curved surface is as follows:
wherein t is c Is the abscissa of the curved surface of the blade tip, h c Is the ordinate of the curved surface of the top of the leaf, beta is the curved surface t of the top of the leaf c The included angle between the tangential line and the axis of abscissa at the position of (0) and the value range is 0-45 DEG, t P Is the abscissa of the highest point P, h P Is the ordinate of the highest point P, t s1 Is the micro roll abscissa maximum.
In a second aspect, embodiments of the present invention provide a pump having a micro-roll curved tip, comprising: pump housing and the above-described tip clearance flow-controlled micro-roll curved tip.
The micro-roll curved surface blade tip for blade tip clearance flow control and the pump with the same adopt an effective way of controlling blade tip clearance flow by the micro-roll curved surface blade tip, improving hydraulic efficiency and running stability of the pump, and the micro-roll curved surface blade tip inhibits flow separation at the pressure side of the blade, reduces turbulence intensity of a blade tip clearance flow field, and reduces blade tip clearance separation vortex; the micro-roll of the suction surface side of the blade weakens the coherent shearing of leakage flow and main flow in a blade tip clearance, thereby inhibiting the leakage vortex of the blade tip clearance, improving the running efficiency and stability of the pump, weakening the pressure pulsation of a flow field, reducing noise, and being simple in structure, easy to process and manufacture and suitable for any type of pump.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic view of a micro-roll curved tip with tip clearance flow control according to an embodiment of the present invention;
fig. 2 is a schematic diagram showing the comparison of the inhibiting effect of the micro-roll curved surface tip provided by the embodiment of the present invention, wherein (a) is an original tip and (b) is a micro-roll curved surface tip.
Reference numerals illustrate:
100-tip clearance flow control micro-roll camber tip, 1-blade tip, 2-pump housing, 3-tip clearance, 4-clearance leakage flow, 5-blade pressure side, 6-blade suction side, and 7-micro-roll camber tip.
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 and intended to explain the present invention and should not be construed as limiting the invention.
Fig. 1 is a schematic view of a micro-roll curved blade tip with tip clearance flow control according to an embodiment of the present invention.
As shown in fig. 1, the tip clearance flow controlled micro-roll curved tip 100 includes: and (3) a blade.
The thickness of the blade is increased to the top area of the blade in equal proportion at the section of each blade chord along the direction of the blade chord, the top of the blade is in a curved surface modeling, and a micro-inclined curved surface blade top is formed so as to control the blade top clearance flow field from the pressure side of the blade to the suction side of the blade. The micro-roll curved surface blade tip 100 for blade tip clearance flow control in the embodiment of the invention adopts the micro-roll curved surface blade tip as an effective way for controlling the pump blade tip clearance flow field and improving the pump hydraulic efficiency and the operation stability.
That is, embodiments of the present invention form a micro-roll curved tip by proportionally increasing the thickness of the blade in the near-blade tip region at each chord section in the chord direction while configuring the blade tip as a curved shape.
Further, in the embodiment of the invention, the pressure side of the original blade is taken as an origin of an abscissa t, the height of the original blade is taken as an origin of an ordinate h, the size tau of the clearance of the original blade top and the thickness delta of the original blade are taken as references, and the micro-roll of the thickness direction of the blade is as follows:
will be the abscissa t s0 =δ, ordinate h s0 As a starting position, the blade is slightly inclined, and the top h of the blade s1 Suction force at=0 slightly inclined to the main flow direction to the abscissa maximum value t s1 The micro-roll surface coordinates of the blade obey a quadratic polynomial function distribution law, wherein delta is the original blade thickness.
The distribution rule of the quadratic polynomial function is as follows:
wherein t is s Is the abscissa of the micro-roll surface, h s Is the ordinate, t, of the micro-roll surface s1 For the maximum value of the micro-roll abscissa of the blade, the maximum value t of the abscissa s1 The value range of (1.1 delta) to (2 delta), h s0 The ordinate is the ordinate of the start position of the blade micro-roll, and the ordinate h s0 The value of (2) is-tau to-5.0 tau, delta is the original blade thickness, theta is the micro-roll surface t s ＝t s1 The included angle between the tangential line and the axis of abscissa is 0-45 deg.
Further, the curved surface modeling of the blade top structure according to the embodiment of the invention is as follows:
taking the pressure side of the original blade as the origin of the abscissa t, taking the height of the original blade as the origin of the ordinate h, and taking the abscissa t c0 =0, ordinate h c0 The curved surface of the tip is molded with a starting position of =0, the tip has a peak P in the thickness range of the blade, and the coordinates of the peak P are (t P ,h P ) The curved surface coordinates of the blade top obey the distribution rule of the cubic polynomial function.
The distribution rule of the cubic polynomial function of the curved surface of the blade top is as follows:
wherein t is c Is the abscissa of the curved surface of the blade tip, h c Is the ordinate of the curved surface of the top of the leaf, beta is the curved surface t of the top of the leaf c The included angle between the tangential line and the axis of abscissa at the position of (0) and the value range is 0-45 DEG, t P Is the abscissa of the highest point P, t P The value range of (2) is 0 to the maximum value t of the micro-roll abscissa of the blade s1 Maximum value t of abscissa s1 The value range of (1.1 delta) to (2 delta), h P Is the ordinate of the highest point P, h P The value of (2) is in the range of 0.1 tau to 5.0 tau.
The following is a further description of a tip clearance flow control micro-roll curved tip according to an embodiment of the present invention.
As shown in fig. 1, a tip clearance 3 exists between the blade tip 1 and the pump housing 2, and a clearance leakage flow 4 enters the impeller flowpath through the tip clearance 3 under the pressure differential of the blade pressure side 5 and suction side 6. The embodiment of the invention increases the thickness of the blade in the area close to the top 1 of the blade in equal proportion at the section of each blade chord along the direction of the blade chord, and simultaneously the curved surface of the top of the blade is shaped, thereby causing a micro-inclined curved surface blade top 7.
Taking the height of an original blade as an origin of an ordinate h, the pressure side of the original blade as an origin of an abscissa t, taking the clearance dimension tau of the top of the original blade and the thickness delta of the original blade as references, carrying out micro roll of the blade from a starting position, and taking the abscissa t of the starting position s0 =δ, ordinate h s0 The method comprises the steps of carrying out a first treatment on the surface of the At blade tip h s1 Suction side main flow direction micro-roll to abscissa maximum t at=0 s1 The method comprises the steps of carrying out a first treatment on the surface of the The starting position of the blade tip 7 of the micro-roll curved surface reaches the top of the blade, and the micro-roll surface coordinates h of the blade s 、t s The function relation obeys the distribution rule of the quadratic polynomial function, and the control rule is as follows:wherein h is s0 The value of (2) is in the range of-tau to-5.0 tau, t s1 The value range is 1.1 delta to 2 delta, the value range of theta is 0 DEG to 45 DEG, tau is the original blade tip clearance size, and delta is the original blade thickness.
Shaping the curved surface of the tip of the leaf from a starting position, the abscissa t of the starting position c0 =0, ordinate h c0 =0; curved surface blade is propped againstThe blade has a highest point P in the thickness range, and the coordinates of the highest point P are (t P ,h P ) The method comprises the steps of carrying out a first treatment on the surface of the Micro-inclined curved surface blade tip 7-blade tip curved surface coordinate h c 、t c The function relation obeys a third-order polynomial function distribution rule, and the control rule is as follows:wherein t is P The value of (2) is in the range of 0 to t s1 ，h P The value of (2) is in the range of 0.1 tau to 5.0 tau.
As shown in fig. 1 and 2, the working principle of the embodiment of the invention is as follows: the clearance leakage flow 4 enters the impeller runner through the blade tip clearance 3, flow separation occurs in the blade tip clearance 3, coherent shearing is formed between the impeller runner and the main flow, the micro-roll curved blade tip 7 inhibits the flow separation of the blade pressure side 5, and the flow field turbulence intensity in the blade tip clearance 3 is weakened, so that separation vortex generated when fluid enters the blade tip clearance 3 from the blade pressure side 5 is inhibited; the suction side 6 of the blade is slightly inclined at the top 1 of the blade, the length of a circumferential flow channel of the gap is extended, and coherent shearing of leakage flow and main flow in the gap at the top of the blade is weakened, so that leakage vortex in the gap at the top of the blade is restrained, and compared with the original top of the blade, the suction side has obvious restraining effect, and the running efficiency and stability of the pump can be improved.
The micro-roll curved blade tip 7 is applicable to any type of pump according to the principle of operation of the micro-roll curved blade tip 7.
According to the micro-roll curved surface blade tip for blade tip clearance flow control, the micro-roll curved surface blade tip is adopted to inhibit pump clearance leakage vortex, so that an effective path of pump hydraulic efficiency and operation stability is improved, the micro-roll curved surface blade tip inhibits flow separation at the pressure side of the blade, and the turbulence intensity of a blade tip clearance flow field is reduced, so that the blade tip clearance separation vortex is reduced; the micro-roll of the suction surface side of the blade weakens the coherent shearing of leakage flow and main flow in a blade tip clearance, thereby inhibiting the leakage vortex of the blade tip clearance, improving the running efficiency and stability of the pump, weakening the pressure pulsation of a flow field, reducing noise, and being simple in structure, easy to process and manufacture and suitable for any type of pump.
In addition, the embodiment of the invention also provides a pump with a micro-inclined curved blade tip, which comprises: the pump shell and the micro-roll curved blade tip for inhibiting the leakage vortex of the clearance between the blade tips in the pump.
The pump with the micro-inclined curved surface blade tip adopts the effective way for inhibiting the leakage vortex of the pump gap and improving the hydraulic efficiency and the operation stability of the pump, and the micro-inclined curved surface blade tip inhibits the flow separation of the pressure side of the blade and reduces the turbulence intensity of the flow field of the clearance of the blade tip so as to reduce the separation vortex of the clearance of the blade tip; the micro-roll of the suction surface side of the blade weakens the coherent shearing of leakage flow and main flow in a blade tip clearance, thereby inhibiting the leakage vortex of the blade tip clearance, improving the running efficiency and stability of the pump, weakening the pressure pulsation of a flow field, reducing noise, and being simple in structure, easy to process and manufacture and suitable for any type of pump.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (8)

1. A micro-roll curved tip for tip clearance flow control, comprising:
and the thickness of the blade is increased to the top area of the blade in equal proportion at the section of each blade chord along the direction of the blade chord, and the top of the blade is in a curved surface modeling to form a micro-inclined curved surface blade top.
2. The tip clearance flow controlled micro-roll curved surface tip of claim 1, wherein the original blade pressure side is taken as the origin of abscissa t and the original blade height is taken as the origin of ordinate h, and the micro-roll in the thickness direction of the blade is:
will be the abscissa t s0 =δ, ordinate h s0 As a starting position, a blade micro-roll is performed, at the top h of the blade s1 Suction force at=0 slightly inclined to the main flow direction to the abscissa maximum value t s1 The micro-roll surface coordinates of the blade obey a quadratic polynomial function distribution law, wherein delta is the original blade thickness.
3. The tip clearance flow controlled micro-roll curved surface tip of claim 2, wherein said ordinate h s0 The value range of (2) is-tau to-5.0 tau, the maximum value t of the abscissa s1 The value range of (1) is 1.1 delta to 2 delta, wherein delta is the original blade thickness, and tau is the original blade tip clearance size.
4. A tip clearance flow controlled micro-roll curved surface tip according to claim 2 or 3, wherein the quadratic polynomial function distribution law is:
wherein t is s Is the abscissa of the micro-roll surface, h s Is the ordinate, t, of the micro-roll surface s1 Maximum value of micro-roll abscissa of blade, h s0 Is the ordinate of the initial position of the micro-roll of the blade, delta is the original blade thickness, and theta is the micro-roll surface t s ＝t s1 The included angle between the tangential line and the axis of abscissa is 0-45 deg.
5. The tip clearance flow controlled micro-roll curved tip of claim 1, wherein the curved profile is:
taking the pressure side of the original blade as the origin of the abscissa t, taking the height of the original blade as the origin of the ordinate h, and taking the abscissa t c0 =0, ordinate h c0 And taking the=0 as a starting position to perform leaf top curved surface modeling, wherein the curved surface leaf top has the highest point P in the range of the leaf thickness, and the leaf top curved surface coordinates obey a cubic polynomial function distribution rule.
6. The tip clearance flow controlled micro-roll curved surface tip of claim 5, wherein said highest point P coordinate is (t P ,h P )，t P The value range of (2) is 0 to the maximum value t of the micro-roll abscissa of the blade s1 The maximum value t of the abscissa s1 The value range of (1.1 delta) to (2 delta), h P The value range of (2) is 0.1 tau to 5.0 tau, wherein delta is the original blade thickness, and tau is the original blade tip clearance size.
7. The tip clearance flow controlled micro-roll curved surface tip of claim 5 or 6, wherein the tip curved surface cubic polynomial function distribution law is:
wherein t is c Is the abscissa of the curved surface of the blade tip, h c Is the ordinate of the curved surface of the top of the leaf, beta is the curved surface t of the top of the leaf c The included angle between the tangential line and the axis of abscissa at the position of (0) and the value range is 0-45 DEG, t P Is the abscissa of the highest point P, h P Is the ordinate of the highest point P, t s1 Is the micro roll abscissa maximum.
8. A pump having a micro-roll curved tip, comprising:
a pump housing;
a tip clearance flow controlled micro-roll curved tip as claimed in any one of claims 1 to 7.
CN202310931820.1A 2023-07-26 2023-07-26 Micro-roll curved surface blade tip for blade tip clearance flow control and pump with same Pending CN116950924A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310931820.1A CN116950924A (en) 2023-07-26 2023-07-26 Micro-roll curved surface blade tip for blade tip clearance flow control and pump with same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310931820.1A CN116950924A (en) 2023-07-26 2023-07-26 Micro-roll curved surface blade tip for blade tip clearance flow control and pump with same

Publications (1)

Publication Number Publication Date
CN116950924A true CN116950924A (en) 2023-10-27

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Application Number Title Priority Date Filing Date
CN202310931820.1A Pending CN116950924A (en) 2023-07-26 2023-07-26 Micro-roll curved surface blade tip for blade tip clearance flow control and pump with same

Country Status (1)

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PB01 Publication
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SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
EE01 Entry into force of recordation of patent licensing contract

Application publication date: 20231027

Assignee: Changsha Changjia intelligent fluid technology Co.,Ltd.

Assignor: TSINGHUA University

Contract record no.: X2023980046675

Denomination of invention: Micro tilting curved blade tip and pump with it for flow control of blade tip clearance

License type: Common License

Record date: 20231109

EE01 Entry into force of recordation of patent licensing contract