Flow pattern improvement in the forebay of pumping station with parallel sluice
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Abstract:
The?project?of?pumping?station?with?parallel?sluice?has?the?advantages?of?compact?layout?and?small?land occupation,?and?it?is?widely?used?in?water?conservancy?projects.?For?the?project?of?pumping?station?with?parallel sluice,?the?flow?direction?of?the?water?flows?into?the?forebay?has?a?certain?angle?with?the?longitudinal?center?line?of the?forebay?when?the?pumping?station?is?working,?so?that?deviation?and?backflow?is?prone?to?appear?in?the?forebay?of pumping?station,?the?flow?pattern?at?the?inlet?of?the?inlet?conduit?will?be?deteriorated,?and?a?suction?vortex?belt?will be?generated?in?severe?cases.?The?safe?and?stable?operation?of?the?pump?unit?will?be?affected?when?the?suction?vortex belt?enters?the?pump.?In?order?to?study?on?the?improvement?of?flow?pattern?in?the?forebay?when?the?pumping?station?of?the?project?is arranged?in?parallel?with?the?sluice?station,?taking?the?Liushan?Pumping?Station?in?the?Eastern?Route?of?the?South-to-North?Water?Transfers?Project?as?an?example,?the?numerical?simulation?study?on?the?flow?pattern?in?forebay?of?the project?of?pumping?station?with?parallel?sluice?was?carried?out?based?on?the?Navier-Stokes?equations?and?the?RNG ?turbulence?model.?Aiming?at?the?flow?field?problems?in?the?forebay,?the?improvement?measures?of?moving?the cleaning?machine?bridge?to?the?pump?house?and?shortening?the?length?of?the?diversion?wall?between?the?sluice?and the?pumping?station?were?proposed,?and?the?flow?pattern?in?the?forebay?under?different?schemes?was?analyzed?based on ?the ?numerical ?calculation ?results, ?the ?uniformity ?and ?average ?angle ?of ?the ?cross-sectional ?flow ?velocity distribution ?after ?the ?inlet ?of ?the ?inlet ?conduit ?of ?each ?pump ?unit ?were ?compared, ?and ?finally ?the ?numerical calculation?results?were?verified?by?the?method?of?hydraulic?overall?model?test. ??????The?research?results?show?that?there?was?a?reflux?vortex?area?in?the?original?forebay?before?the?inlets?of?inlet conduits?of?No.?4?and?No.?5?pump?units?of?the?Liushan?Pumping?Station?in?the?Eastern?Route?of?the?South-to-North Water?Transfers?Project,?and?a?harmful?suction?vortex?was?generated?before?the?inlet?of?inlet?conduit?of?No.?4?pump unit.?In?the?improvement?scheme?of?forebay,?the?cleaning?machine?bridge?was?moved?by?25?m?to?the?pump?house?as a?whole,?and?the?length?of?the?diversion?wall?between?the?sluice?and?the?pumping?station?was?shortened?so?that?its head?was?level?with?the?pier?of?cleaning?machine?bridge.?The?range?of?the?swirl?flow?in?the?forebay?was?effectively compressed?and?the?intensity?of?the?swirl?flow?was?weakened.?Not?only?the?harmful?suction?vortex?at?the?inlet?of?the inlet?conduit?of?No.?4?pump?unit?was?eliminated,?but?also?the?uniformity?of?the?flow?velocity?distribution?at?the?inlet of?the?inlet?conduit?of?No.?4?pump?unit?was?increased?by?2.5%?on?average,?and?the?inlet?flow?pattern?of?the?pump station?was?significantly?improved.?The?on-site?operation?of?the?Liushan?Pumping?Station?over?the?years?shows?that there?is?no?bad?flow?pattern?in?the?forebay?under?the?conditions?of?different?start-up?combinations,?and?the?pumps operates?steadily. ??????The?position?of?the?suction?vortex?before?the?inlet?of?the?inlet?conduit?is?accurately?predicted?by?the?method?of numerical?simulation?of?the?forebay?flow?field?in?project?of?pumping?station?with?parallel?sluice,?and?the?numerical calculation?results?are?basically?consistent?with?the?model?test?results?and?field?observation?results.?The?problem?of the?flow?pattern?in?the?forebay?is?solved?by?adjusting?the?position?of?the?pier?of?the?cleaning?machine?bridge?of?the pumping?station?without?adding?measures?such?as?bottom?sill,?column?and?diversion?pier.?The?research?results?can provide?reference?for?the?same?type?of?engineering?research.
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