US20130170974A1 - Pumping element design - Google Patents

Pumping element design Download PDF

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Publication number
US20130170974A1
US20130170974A1 US13/821,014 US201013821014A US2013170974A1 US 20130170974 A1 US20130170974 A1 US 20130170974A1 US 201013821014 A US201013821014 A US 201013821014A US 2013170974 A1 US2013170974 A1 US 2013170974A1
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US
United States
Prior art keywords
blade
pumping element
section
incidence angle
tip
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US13/821,014
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English (en)
Inventor
Kevin J. Lunde
Sen Y. Meng
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aerojet Rocketdyne of DE Inc
Original Assignee
Pratt and Whitney Rocketdyne Inc
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 Pratt and Whitney Rocketdyne Inc filed Critical Pratt and Whitney Rocketdyne Inc
Assigned to PRATT & WHITNEY ROCKETDYNE, INC. reassignment PRATT & WHITNEY ROCKETDYNE, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Lunde, Kevin J., MENG, SEN Y.
Publication of US20130170974A1 publication Critical patent/US20130170974A1/en
Assigned to AEROJET ROCKETDYNE OF DE, INC. reassignment AEROJET ROCKETDYNE OF DE, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: PRATT & WHITNEY ROCKETDYNE, INC.
Assigned to BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT reassignment BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT NOTICE OF GRANT OF SECURITY INTEREST IN PATENTS Assignors: AEROJET ROCKETDYNE OF DE, INC.
Assigned to AEROJET ROCKETDYNE OF DE, INC. reassignment AEROJET ROCKETDYNE OF DE, INC. TERMINATION AND RELEASE OF SECURITY INTEREST IN PATENTS Assignors: BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • 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
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2261—Rotors specially for centrifugal pumps with special measures
    • F04D29/2277—Rotors specially for centrifugal pumps with special measures for increasing NPSH or dealing with liquids near boiling-point
    • 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
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/24—Vanes
    • F04D29/242—Geometry, shape
    • 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

Definitions

  • the present disclosure relates to a pumping element, and more particularly to design methodology therefor.
  • Fluid pumps include axial flow pumps and centrifugal flow pumps.
  • Historical design practice typically achieves the required suction performance with some cavitation induced instability.
  • Typical historical design practices such as increased tip clearance, casing treatment, and tip vortex suppression have limited success to minimize cavitation induced instability but often result in reduced suction performance capability.
  • FIG. 1 is a developed view of a blade leading edge
  • FIG. 2 is a RELATED ART graphical representation of the pumping element design throat thickness and cavity height
  • FIG. 3 is a graphical representation of a pumping element leading edge design approach according to one non-limiting embodiment of the present application.
  • FIG. 1 there is shown a schematic view of a blade 20 of a pumping element, inducer, and impeller. Cavitation occurs on pump elements when the static pressure is decreased to a value below that of the fluid vapor pressure. Many types of cavitation are known to occur in fluid mechanics.
  • Equation 1 The flow coefficient ⁇ shown in Equation 1 defines the relationship between the inlet meridonal velocity C m , the blade speed U, blade angle ⁇ , and incidence angle ⁇
  • the design philosophy disclosed herein constrains the value of blade angle / 3 as a function of incidence angle ⁇ to essentially render the incidence angle an independent variable as opposed to the conventional process which considers incidence angle as a dependent variable.
  • the information given in Stripling (1962), Japikse (2001), and Hashimoto (1997) is 15 representative of conventional design practice for selection of blade angle ⁇ and incidence angle ⁇ . Included by reference herein.
  • the conventional pump element design methodology typically uses a positive tip incidence angle. For an un-shrouded pumping element, this positive tip incidence angle combined with the tip clearance generates a tip vortex which can travel upstream of the pumping element. This upstream flow is often called backflow.
  • the backflow strength and flowrate are determined by tip incidence angle and the tip clearance. As the backflow strength and flowrate reach a certain level, the backflow will interact with the adjacent pumping element blade and cavitation instabilities will be generated.
  • the cavitation instability mode shapes are determined by the complicity of the backflow and adjacent blade interactions.
  • the pumping element maximum throat blade thickness from hub-to-tip is usually a linear function of radius ( FIG. 2 ).
  • the minimum and maximum blade thicknesses are determined by structural requirements.
  • the conventional pumping element design process defines the blade leading edge angle by holding the radius (r) times the tangent of the blade angle ( ⁇ ) equal to a constant. This design approach results in the cavity volume being substantial greater than the blade volume ( FIG. 2 ). This results in cavitation induced instabilities. To fix this shortcoming, alternative blade leading edge angle distributions are required.
  • a pumping element includes a blade having a first section proximate a hub and a second section proximate a tip.
  • a cavity height distribution is based on a selected incidence angle distribution.
  • a selected blade thickness distribution is based on a structural requirement.
  • the resulting cavity height distribution matches the blade thickness at the first section and the second section and is greater than the blade thickness along the blade. That is, the incidence angle at the hub ( ⁇ h ) and tip ( ⁇ t ) are chosen to match the cavity heights with the first section hub and second section tip blade thicknesses.
  • the cavity volume is substantial less than the conventional pumping element cavity volume and much closer to the blade volume.
  • the reduction in cavity volume results in the reduction of cavitation pumping element instabilities. Additionally, this approach achieved excellent suction performance.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US13/821,014 2010-09-10 2010-09-10 Pumping element design Abandoned US20130170974A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2010/048332 WO2012033495A1 (en) 2010-09-10 2010-09-10 Pumping element design

Publications (1)

Publication Number Publication Date
US20130170974A1 true US20130170974A1 (en) 2013-07-04

Family

ID=43982215

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/821,014 Abandoned US20130170974A1 (en) 2010-09-10 2010-09-10 Pumping element design

Country Status (5)

Country Link
US (1) US20130170974A1 (zh)
EP (1) EP2614257A1 (zh)
JP (1) JP5684390B2 (zh)
CN (1) CN103080561B (zh)
WO (1) WO2012033495A1 (zh)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6435829B1 (en) * 2000-02-03 2002-08-20 The Boeing Company High suction performance and low cost inducer design blade geometry

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3442220A (en) * 1968-08-06 1969-05-06 Rolls Royce Rotary pump
JPH0772529B2 (ja) * 1988-06-20 1995-08-02 株式会社日立製作所 水車及びその製造方法
CN1017271B (zh) * 1988-11-09 1992-07-01 株式会社日立制作所 水轮机
JP2969321B2 (ja) * 1994-03-04 1999-11-02 株式会社クボタ 軸流ポンプ
JPH11247788A (ja) * 1998-02-27 1999-09-14 Shin Meiwa Ind Co Ltd 軸流ポンプ及びそれを備えた曝気装置
US7207767B2 (en) * 2002-07-12 2007-04-24 Ebara Corporation Inducer, and inducer-equipped pump
US7097414B2 (en) * 2003-12-16 2006-08-29 Pratt & Whitney Rocketdyne, Inc. Inducer tip vortex suppressor
JP3949663B2 (ja) * 2004-01-29 2007-07-25 三相電機株式会社 遠心羽根車

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6435829B1 (en) * 2000-02-03 2002-08-20 The Boeing Company High suction performance and low cost inducer design blade geometry

Also Published As

Publication number Publication date
CN103080561B (zh) 2016-06-15
WO2012033495A1 (en) 2012-03-15
EP2614257A1 (en) 2013-07-17
JP5684390B2 (ja) 2015-03-11
JP2013537274A (ja) 2013-09-30
CN103080561A (zh) 2013-05-01

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AS Assignment

Owner name: PRATT & WHITNEY ROCKETDYNE, INC., CALIFORNIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LUNDE, KEVIN J.;MENG, SEN Y.;REEL/FRAME:029930/0705

Effective date: 20100902

AS Assignment

Owner name: AEROJET ROCKETDYNE OF DE, INC., CALIFORNIA

Free format text: CHANGE OF NAME;ASSIGNOR:PRATT & WHITNEY ROCKETDYNE, INC.;REEL/FRAME:030902/0313

Effective date: 20130617

AS Assignment

Owner name: BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT, TE

Free format text: NOTICE OF GRANT OF SECURITY INTEREST IN PATENTS;ASSIGNOR:AEROJET ROCKETDYNE OF DE, INC.;REEL/FRAME:039070/0109

Effective date: 20160617

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION

AS Assignment

Owner name: AEROJET ROCKETDYNE OF DE, INC., CALIFORNIA

Free format text: TERMINATION AND RELEASE OF SECURITY INTEREST IN PATENTS;ASSIGNOR:BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT;REEL/FRAME:064424/0064

Effective date: 20230728