EP0056233B1 - Diffuseur à aspiration pariétale - Google Patents

Diffuseur à aspiration pariétale Download PDF

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Publication number
EP0056233B1
EP0056233B1 EP82100019A EP82100019A EP0056233B1 EP 0056233 B1 EP0056233 B1 EP 0056233B1 EP 82100019 A EP82100019 A EP 82100019A EP 82100019 A EP82100019 A EP 82100019A EP 0056233 B1 EP0056233 B1 EP 0056233B1
Authority
EP
European Patent Office
Prior art keywords
slot
wall
inlet
diffusor
upstream
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.)
Expired
Application number
EP82100019A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0056233A1 (fr
Inventor
Michel Vincent De Paul
Gilbert Riollet
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.)
Alstom SA
Original Assignee
Alsthom Atlantique SA
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 Alsthom Atlantique SA filed Critical Alsthom Atlantique SA
Priority to AT82100019T priority Critical patent/ATE9832T1/de
Publication of EP0056233A1 publication Critical patent/EP0056233A1/fr
Application granted granted Critical
Publication of EP0056233B1 publication Critical patent/EP0056233B1/fr
Expired 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
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/30—Exhaust heads, chambers, or the like
    • 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
    • F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
    • F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
    • F04D29/682—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps by fluid extraction
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/70—Shape
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S415/00—Rotary kinetic fluid motors or pumps
    • Y10S415/914—Device to control boundary layer

Definitions

  • the present invention relates to a symmetrical parietal suction diffuser of revolution autor of an axis AA 'and with a substantially axial inlet, used for example in a turbine or in a wind tunnel, comprising an outer wall surrounding the fluid flowing at the interior of the diffuser from the inlet to the outlet, said wall being provided with a circular slot evacuating one of the incoming flow and having a pattern such that the pressure gradient measured at its surface in the direction of flow is negative in upstream of said slot.
  • the object of the invention is to avoid any separation.
  • This object is achieved by a diffuser as defined above which is characterized in that said wall, downstream of said slot, has a layout such that the direction of flow all along said wall downstream of said slot either in the direction of entry towards exit and that the pressure gradient measured on its surface in the direction of flow is positive.
  • Diffusers are also known in which the pressure gradient upstream and downstream of the slot is zero.
  • the diffuser according to the invention making it possible to use a lower suction rate on an outer wall having a pattern such that the pressure gradient measured on its surface in the direction of flow is negative upstream of said slot and positive downstream, which prevents any separation of the boundary layer upstream of the slit as downstream.
  • the angle of entry of the fluid into the slot is between 100 ° and 120 °.
  • the optimal width of the slit is close to this value. Indeed, if the slit has a small width, on the one hand, this reduces the possibilities of picking up any detached areas occurring upstream of the slit and, on the other hand, it increases the losses in the slit, the speed penetration into the slot then being too high (at constant suction rate). On the other hand, if the width of the slit is too large, the speed of penetration into the slit is too low (at constant suction rate) and the detachments upstream of the slit are facilitated, and moreover there will be a overspeed on the leading edge downstream of the slit causing a thickening of the boundary layer which can go as far as detachment.
  • the offset between the plane perpendicular to the axis and tangent to the convex wall upstream of the slot and the plane perpendicular to the axis and passing through the center of the osculating circle at the edge of the wall downstream of the slit is equal to or slightly greater than with X, So, r, V1, R1 being defined as above.
  • Figure 1 shows a first type of flow in a diffuser with axial inlet and wall suction.
  • FIG. 2 represents a second type of flow in a diffuser with axial inlet and wall suction.
  • FIG. 3 represents a diffuser according to the invention.
  • FIG. 4 represents an enlargement of the inlet of the suction slot of the diffuser according to the invention, marked IV in FIG. 3.
  • Figures 5 to 8 show the variation curves of the suction rate as a function of the width of the slot.
  • FIG. 9 represents the variation of the speed of the fluid along the external wall of the diffuser.
  • FIGS 1 and 2 there is shown an axial inlet diffuser having an outer wall and a slot 1 separating said wall into an upstream part 2 and a downstream part 3.
  • the diffuser also has an internal wall 4.
  • the diffuser is symmetrical with revolution around an axis and the outer wall 2, 3 has a pattern such that the pressure gradient upstream and downstream of the slot is zero.
  • Figure 1 there is shown a normal flow which is sought.
  • the boundary layer located upstream of the slot 1 along the outer wall 2 is sucked in through the slot 1.
  • a represents the variation in the suction rate X as a function of the width of the width b of the slot 1.
  • a first curve (1) in dashed line represents the minimum values of X as a function of b for which the flow regime of FIG. 1 is established
  • a second curve (II) in solid line represents the maximum values of X as a function of b where it is established, for sure, the flow regime of figure 2.
  • b bo we obtain a value of X, X i on the curve 1 and X 2 on curve II. For the values of X less than or equal to X 2 , only the flow regime of FIG. 2 is established.
  • the two flow regimes can be established and for the values of X greater than or equal to X 1 , only the regime of FIG. 1 can be established.
  • suction rate X a value equal to or greater than that defined by curve 1.
  • FIG 3 there is shown the diffuser according to the invention also symmetrical with respect to an axis of revolution AA '.
  • the outer wall is interrupted by a slot 1 which separates it from the upstream wall 2 and the downstream wall 3.
  • the outer wall has a pattern such that the pressure gradient measured at its surface in the direction of flow is negative upstream of the said wall. slit and positive downstream.
  • the inlet section of the diffuser is So and the average speed in this section is Vo.
  • the circular slot 1 is also symmetrical in revolution about the axis AA 'and has a width b at its inlet BC and the speed of the fluid on the wall 2 at the inlet of the slot 1 at point C is V 1 . Slot 1 widens slightly after entering.
  • R 1 the radius of curvature of the upstream wall 2 at the entrance to the slot 1 and by r the radius measured with respect to the axis AA 'of the entrance to the slot.
  • the angle of the slot with respect to the axis AA ' is ⁇ .
  • FIG. 6 shows the curves I and II for a diffuser according to the invention, in which the outer wall has a line such that the pressure gradient measured at its surface in the direction of flow is negative upstream of the slot and positive downstream.
  • Curves 1 and II are lowered and it is therefore possible to obtain, with the same slot width (if we compare with FIG. 5), correct operation by using a suction rate X which is significantly lower.
  • the pressure on the wall 2 will gradually decrease from the inlet of the diffuser to the inlet of the slot 1, so that the fluid will be accelerated and the state of the boundary layer will be further from the separation.
  • We will generally take a speed of 15% to 40% higher than the speed of entry into the diffuser, depending on the layout possibilities available.
  • the layout of the wall 3 will reduce the risks of formation of the flow of FIG. 2.
  • the slit width is an important parameter so much. In fact, if it is too low, the possibilities of capturing any detached areas occurring on the wall 2 are reduced. In addition, this increases losses in the slit (at constant suction rate). If the width is too large, the detachment on the wall 2 is facilitated and in addition the stopping point S (where the speed is zero) may be slightly inside the slot, hence a significant overspeed of the flow around the leading edge following S on the wall 3, which will cause a thickening of the boundary layer on the wall 3 which can go as far as detachment, therefore greater losses for this diffuser.
  • the optimal width b oP t will be close to With l
  • the ratio V1 Vo can easily be measured by placing a static pressure tap at the inlet of the slot (p 1 ) and another in the inlet plane of the diffuser (in), then by measuring the stop pressure ( pô) in said entry plane using a pitot probe
  • FIG. 9 shows the variation of the ratio V Vo (V being the speed at point M taken on the wall 2 or 3) as a function of the curvilinear abscissa OM, 0 being the point of the wall 2 at the entry of the diffuser.
  • the wall 3 downstream of the slot is offset in the flow (see FIG. 4); this offset ⁇ is measured by the distance of two planes perpendicular to the axis AA ', one tangent to the upstream convex wall 2, the other passing through the center of the osculating circle at the leading edge of the downstream wall 3
  • This offset 0 is preferably equal to or slightly greater than the value b o p t previously indicated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
  • Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Soil Working Implements (AREA)
  • External Artificial Organs (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Medicinal Preparation (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Finger-Pressure Massage (AREA)
  • Walking Sticks, Umbrellas, And Fans (AREA)
  • Catching Or Destruction (AREA)
EP82100019A 1981-01-08 1982-01-05 Diffuseur à aspiration pariétale Expired EP0056233B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82100019T ATE9832T1 (de) 1981-01-08 1982-01-05 Diffusor mit grenzschichtabsaugung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8100210A FR2497544A1 (fr) 1981-01-08 1981-01-08 Diffuseur a aspiration parietale
FR8100210 1981-01-08

Publications (2)

Publication Number Publication Date
EP0056233A1 EP0056233A1 (fr) 1982-07-21
EP0056233B1 true EP0056233B1 (fr) 1984-10-10

Family

ID=9253948

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82100019A Expired EP0056233B1 (fr) 1981-01-08 1982-01-05 Diffuseur à aspiration pariétale

Country Status (13)

Country Link
US (1) US4471910A (ko)
EP (1) EP0056233B1 (ko)
JP (1) JPS57146003A (ko)
KR (1) KR890000914B1 (ko)
AT (1) ATE9832T1 (ko)
AU (1) AU547535B2 (ko)
BR (1) BR8200051A (ko)
CA (1) CA1193513A (ko)
DE (1) DE3260910D1 (ko)
ES (1) ES8302862A1 (ko)
FR (1) FR2497544A1 (ko)
RO (1) RO82608A (ko)
ZA (1) ZA82121B (ko)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5059093A (en) * 1990-06-07 1991-10-22 United Technologies Corporation Compressor bleed port
FR2835019B1 (fr) * 2002-01-22 2004-12-31 Snecma Moteurs Diffuseur pour moteur a turbine a gaz terrestre ou aeronautique
GB0229307D0 (en) * 2002-12-17 2003-01-22 Rolls Royce Plc A diffuser arrangement
US8474266B2 (en) 2009-07-24 2013-07-02 General Electric Company System and method for a gas turbine combustor having a bleed duct from a diffuser to a fuel nozzle
US8381532B2 (en) * 2010-01-27 2013-02-26 General Electric Company Bled diffuser fed secondary combustion system for gas turbines
US20130051974A1 (en) * 2011-08-25 2013-02-28 Honeywell International Inc. Gas turbine engines and methods for cooling components thereof with mid-impeller bleed cooling air
CN103244459B (zh) * 2013-04-25 2015-08-05 哈尔滨工业大学 一种亚音速吸附式轴流压气机气动设计方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR992353A (fr) * 1944-06-22 1951-10-17 Cem Comp Electro Mec Amélioration de la récupération des diffuseurs
US3216455A (en) * 1961-12-05 1965-11-09 Gen Electric High performance fluidynamic component
GB1000767A (en) * 1963-05-08 1965-08-11 Int Research & Dev Co Ltd Diffusers for fluids
FR2401311A1 (fr) * 1977-08-25 1979-03-23 Europ Turb Vapeur Dispositif d'echappement pour turbine axiale a fluide condensable

Also Published As

Publication number Publication date
ATE9832T1 (de) 1984-10-15
BR8200051A (pt) 1982-10-26
FR2497544A1 (fr) 1982-07-09
KR890000914B1 (ko) 1989-04-13
FR2497544B1 (ko) 1985-05-03
CA1193513A (fr) 1985-09-17
KR830009415A (ko) 1983-12-21
AU547535B2 (en) 1985-10-24
ES508555A0 (es) 1982-12-01
AU7926482A (en) 1982-07-15
RO82608A (ro) 1983-09-26
JPH0259285B2 (ko) 1990-12-12
EP0056233A1 (fr) 1982-07-21
US4471910A (en) 1984-09-18
ES8302862A1 (es) 1982-12-01
ZA82121B (en) 1982-11-24
JPS57146003A (en) 1982-09-09
DE3260910D1 (en) 1984-11-15

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