Wall st. journal

Flow channel for two phase flow - patent EP0989307 flow channel for two phase flow. The flow channel has at internal barrier (1) completely enclosing the two phase flow (4) radially ton the flow direction. The internal barrier has raised contours (3) essentially perpendicular ton the flow direction and RK A distance distinctively into the flow direction. The contours CAN rib shaped and OF A closed shape on the internal barrier, thus fully enclosing the two phase flow. Images of acres available in pdf form when logged in. View of patent that cite this patent Click for AUTOMATIC bibliography generation ALSTOM Technology Ltd. (Brown Boveri road 7, 5400 bathing, CH). Flow duct according tons of Claim 1, characterized in that the contours (3) CAN wetted with liquid RK leases on their side facing the two phase flow (4). Flow duct according tons of Claim 1, characterized in that the height OF the contours (3) is less than their mutual spacing. Flow duct according tons of Claim 1, characterized in that the mutual spacing reads within the cm rank, typically about 5 cm. Flow duct according tons of Claim 1, characterized in that the flow duct (2) is A compressor steam turbine and gas turbine systems, for example for A gas turbine plans. Flow duct according tons of Claim 1, characterized in that the flow duct (2) is A two phase Laval nozzle. In the managing described case an air water mixture is accelerated l"ngs a Gef"llstrecke and led anschlieend into a pressure chamber. However so far no more exact investigations are regarding that the Zweiphasenstr"mung umschlieenden Str"mungskanalwand employed. Some interesting aspects of the Str"mungsverhaltens of a Zweiphasenstr"mung by a Str"mungskanal k"nnen the following Beitr"gen to be taken:. Huang, Droplet dispersion and ejection process in two phase boundary more layer, AIAA journal 32 (11), 2217 (1994). Morikawa, LDV measurements OF at air-solvently two phase flow in A horizontal pipe, J. Shiomi, LDV measurements OF at air-solvently two phase flow in A vertically pipe, J. The ribs serve an intensification of the W"rmebertragung in this case. US 4574643 has a device for flow measurement with Zweiphasenstr"mungen, in particular to šberwachung from Nassdampfstr"mungen, to the article. Here the inner wall of a rohrf"rmigen Str"mungskanals with a schraubenlinienf"rmig running raised outline is ausgerstet. In particular the efficiency of a Lavaldse, which a two-phase mixture passes through, is to be increased by reduction by Wandstr"mungsverlusten. Erfindungsgem"en are to serve therefore also in the long run the efficiency increase of the entire gas turbine system. The L"sung that the invention underlying task is indicated in the unabh"ngigen requirement. The erfindungsgedanken favourably training further are article of the abh"ngigen Ansprche. Those the invention underlying idea takes itself to the principle, with which Tragflgelboote or hovercrafts, move themselves so-called Hoovercrafts. By planning such outlines at the inner wall of a Str"mungskanals and/or differently it looks in the case of a Zweiphasenstr"mung, with which both phases differ strongly in their specific density. In particular the Zweiphasenstr"mung gefhrte in the Str"mungskanal is gefhrt by a such shaping m"glichst without groe wall friction losses. Cutout from a L"ngsschnittdarstellung by one invention in accordance with" trained Str"mungskanal. vergr"erte L"ngsschnittdarstellung as in Fig. thereby was put a rib distance of 5 cm, a Wasserstr"mungsgeschwindigkeit of 100 m/s and a pressure from 98 kPa to reason. Ways fr a Ausfhrungsform and a commercial applicability. 1 is represented a preferential Ausfhrungsform in L"ngsschnittdarstellung by one invention in accordance with" trained Str"mungskanal 2. At the inner wall 1 of the Str"mungskanals 2 to a large extent perpendicularly raised outlines 3 are intended to the inner wall 1, which project into the inside of the Str"mungskanals 2. 1a durchstr"mt the Zweiphasenstr"mung 4 the Str"mungskanal 2 from above downward in accordance with" arrow representation. In particular the Zweiphasenstr"mung 4 the formed outlines 3 by their Berhrfl"chen 5 berstreift tangential in each case, so there friction losses to be kept just as small k"nnen. 1b is shown a detail representation of an inner wall section with a raised outline 3 appropriate on it. In particular represented Str"mungsebene a boundary layer 9 forms out in strichliert, which serves 6 as shearing and/or interface between the Zweiphasenstr"mung 4 and the Zwischenr"umen. Thus typical Abst"nde lies between two neighbouring ribs 3 with approximately 5 cm.