DE461652C - Device to improve the efficiency of exhaustors - Google Patents

Device to improve the efficiency of exhaustors

Info

Publication number
DE461652C
DE461652C DEM101005D DEM0101005D DE461652C DE 461652 C DE461652 C DE 461652C DE M101005 D DEM101005 D DE M101005D DE M0101005 D DEM0101005 D DE M0101005D DE 461652 C DE461652 C DE 461652C
Authority
DE
Germany
Prior art keywords
diffuser
suction
wall
exhaustor
boundary layer
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
DEM101005D
Other languages
German (de)
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.)
MAN AG
Original Assignee
MAN Maschinenfabrik Augsburg Nuernberg AG
Publication date
Priority to DEM101005D priority Critical patent/DE461652C/en
Application granted granted Critical
Publication of DE461652C publication Critical patent/DE461652C/en
Expired legal-status Critical Current

Links

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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F04D29/4233—Fan casings with volutes extending mainly in axial or radially inward direction
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Jet Pumps And Other Pumps (AREA)

Description

Einrichtung zur Verbesserung des Wirkungsgrads von Exhaustoren. Es ist bekannt, daß man die Energieverluste, welche bei der Förderung von Flüssigkeit durch einen stark erweiterten Diffusor dadurch hervorgerufen werden, daß die Grenzschicht der strömenden Flüssigkeit gegen den starken Druckanstieg schon bald nicht mehr ankommen kann und die Strömung sich von der Wandung ablöst, dadurch vermeiden kann, daß man die Grenzschicht durch Absaugöffnungen in der Diffusorwand absaugen läßt und so eine die Ablösung der Strömung herbeiführende Verstärkung dieser Grenzschicht verhindert.Device for improving the efficiency of exhaustors. It it is known that the energy losses which occur when pumping liquid caused by a greatly expanded diffuser that the boundary layer the flowing liquid against the strong pressure increase soon stopped can arrive and the flow detaches itself from the wall, thus avoiding that the boundary layer can be sucked off through suction openings in the diffuser wall and thus a strengthening of this boundary layer which leads to the separation of the flow prevented.

Die Erfindung besteht in der Anwendung dieses Gedankens auf Exhaustoren und in der Verwendung der Saugwirkung des Exhaustors selbst zur Absaugung der Grenzschicht. Sie besteht also darin, daß die Wandung des Diffusors mit Absaugöffnungen versehen ist, die in einen mit der Saugöffnung des Exhaustors über einen drosselnden Durchlaß in Verbindung stehenden Ringraum münden.The invention consists in applying this idea to exhaustors and in the use of the suction effect of the exhaustor itself to suck up the boundary layer. It consists in that the wall of the diffuser is provided with suction openings is that in a with the suction opening of the exhaustor via a throttling passage open into connecting annular space.

Da die wirbeligen Vorgänge an der Innenkurve des Diffusors am stärksten in Erscheinung treten, so ist in erster Linie für die wirksame Absaugung des Grenzschicht an der innenliegenden Diffusorwand zu sorgen, doch ist gegebenenfalls die Absaugung an dem übrigen Teil der Diffusorwandung nicht zu vernachlässigen. Um also die Absaugung der Grenzschicht an allen Stellen, an denen eine Ablösung der Strömung zu befürchten ist, vornehmen zu können, wird vorteilhaft der mit der Saugöffnung des Exhaustors in Verbindung stehende Ringraum auf die ringsum hohl ausgebildete Diffusorwandung ausgedehnt.Because the eddy processes are strongest on the inner curve of the diffuser appear, it is primarily for the effective suction of the boundary layer to take care of the inner diffuser wall, but the suction may be necessary not to be neglected on the remaining part of the diffuser wall. So about the suction the boundary layer at all points where a separation of the flow is to be feared is to be made, the one with the suction opening of the exhaustor is advantageous related annular space on the all around hollow diffuser wall extended.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung im axialen Mittelschnitt durch den Exhaustor dargestellt.In the drawing, an embodiment of the invention is in the axial Center section through the exhaustor shown.

Bei einfachster Ausführung der Erfindung ist, wie die ausgezogenen Linien der Abbildung zeigen, der Raum a zwischen der Saugöffnung b des Exhaustors und der innenliegenden Wand c des Diffusors als geschlossener Ringraum ausgebildet. Derselbe steht mit der Saugöffnung b über einem drosselnden Durchlaß d in Verbindung. In der Wand c sind die Absaugöffnungen e vorgesehen, so daß das über den drosselnden Durchlaß d im. Raum a unterhaltene leichte Vakuum auf die Grenzschicht des im Diffusor strömenden Mediums einwirkt, diese also durch den Exhaustor selbst abgesaugt wird.The simplest embodiment of the invention is like the one drawn out Lines in the figure show the space a between the suction opening b of the exhaustor and the inner wall c of the diffuser is designed as a closed annular space. The same is connected to the suction opening b via a throttling passage d. In the wall c, the suction openings e are provided so that the throttling Passage d in. Space a maintained a slight vacuum on the boundary layer of the diffuser flowing medium acts, so this is sucked off by the exhaustor itself.

Falls auch an dem übrigen Teil der Diffusorwandung ein Absaugen der Grenzschicht stattfinden soll, ist, wie durch die gestrichelten Linien angedeutet ist, die Wandung ringsum als Hohlwand ausgebildet, deren Innenraum mit dem Ringraum a in Verbindung steht. Die Absaugung. wirkt also am ganzen Umfang des Diffusors, und man ist somit in der Lage, an gewünschten Stellen durch zusätzliche Absaugöffnungen die Grenzschicht gleichfalls zu entfernen.If the remaining part of the diffuser wall is also suctioned off Boundary layer should take place is, as indicated by the dashed lines is, the wall is designed all around as a hollow wall, the interior of which with the annular space a communicates. The suction. thus acts on the entire circumference of the diffuser, and you are thus able to use additional suction openings at desired points also remove the boundary layer.

Claims (2)

PATENTANSPRÜCHE: z. Einrichtung zur Verbesserung des Wirkungsgrades von Exhaustoren in Gestalt von Absaugöffnungen für die Grenzschicht in der Diffusorwandung, dadurch gekennzeichnet, daß die Absaugöffnungen (e) in einen Ringraum (a) münden, der mit der Saugöffnung (b) des Exhaustors über einen drosselnden Durchlaß (d) in Verbindung steht. PATENT CLAIMS: e.g. Device to improve efficiency of exhaustors in the form of suction openings for the boundary layer in the diffuser wall, characterized in that the suction openings (e) open into an annular space (a), the one with the suction opening (b) of the exhaustor via a throttling passage (d) in Connection. 2. Einrichtung nach Anspruch i, dadurch gekennzeichnet, daß der mit der Saugöffnung (b) des Exhaustors in Verbindung stehende Ringraum (a) auf die ganze ringsum hohl ausgebildete Wandung des Diffusors ausgedehnt ist.2. Device according to claim i, characterized in that the with the suction opening (b) of the exhaustor in communication with the annular space (a) whole all around hollow wall of the diffuser is expanded.
DEM101005D Device to improve the efficiency of exhaustors Expired DE461652C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEM101005D DE461652C (en) Device to improve the efficiency of exhaustors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM101005D DE461652C (en) Device to improve the efficiency of exhaustors

Publications (1)

Publication Number Publication Date
DE461652C true DE461652C (en) 1928-06-25

Family

ID=7324472

Family Applications (1)

Application Number Title Priority Date Filing Date
DEM101005D Expired DE461652C (en) Device to improve the efficiency of exhaustors

Country Status (1)

Country Link
DE (1) DE461652C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2864236A (en) * 1952-06-05 1958-12-16 Snecma Method of and means for the control of the air inlet opening of a jet propulsion unit or a gas turbine engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2864236A (en) * 1952-06-05 1958-12-16 Snecma Method of and means for the control of the air inlet opening of a jet propulsion unit or a gas turbine engine

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