DynaJets Brochure

DYNAFLOW, INC. DYNAFLOW, INC.DYNAFLOW, INC.10621-J Iron Bridge RoadJessup, MD 20794Phone: (301) 604-3688 Fax: (301) 604-3689Email: info@dynaflow-inc.com URL: http://www.dynaflow-inc.comDYNAFLOW, INC. Jet TechnologiesDYNAFLOW, INC. provides Research & Development in Applied Sciences. Our capabilities spanthe spectrum of software development, analysis, numerical simulation, experimentation, testing,and experience in:Material Erosion due to CavitationUnderwater ExplosionsFlow VisualizationLiquid & Air FiltrationComputational Fluid DynamicsComputed TomographyFluid MechanicsSoftware for ScienceWater Jet TechnologyAcousticsFlow Oscillation, Vibration & Sound GenerationDynamic Materials PropertiesMaterial Erosion due to Drop ImpactFluid-Structure InteractionsMaterials ScienceMultiphase FlowsTMDYNAFLOW, INC.DYNAFLOW, INC.10 3Cavitation:Intense, repeated, localizedimpact due to the collapse of amultitude of minute cavitationbubbles on the target.Jet Interruption:Intense, cyclic water hammerimpact of liquid slugs and dropsin contrast to continuous jets.Jet Structuring:Collection of jet turbulence intolarge structures, resulting inintense cavity collapse or densecompact liquid slug impact.DYNAJETS™ Concepts ImproveJet Efficiency in Most ApplicationsDYNAJETS enhance jet effectiveness in cutting, cleaning, andmaterial removal by taking advantage of three phenomena:DYNAFLOW employs anumber of techniques toenhance the erosivity ofwater jets. These include:• Pulsing of the jet• Deliberate introduction of cavitation• Passive acoustic resonanceThe resulting patentedjet technologies enablegreatly increasedcleaning and cutting at agiven pressure, or asubstantial reduction inpressure for the samecleaning and cutting ratesof conventional jets.Whether operating in airor submerged,DYNAFLOW can design ajet with improvedperformance.R&D and ConsultingDYNAFLOW, INC. conducts a full range of research,development, and consulting services on jets, cavitation, and theireffects on materials including analytical, numerical and experimentalwork.DYNAFLOW, INC. can provide a complete package offundamental and applied capabilities, including model development,simulation, analysis, experimentation, and testing.Spark cell for cavitation and underwaterexplosion studies.Simulation of a cavitating vortex ring usingDYNAFLOW’S software 2DYNAFS™.YNAFLOW, INC. p Spark generated bubbles.TMDYNAFLOW, INC. DYNAFLOW, INC.8 5formation of large vortical ring cavities which collapse on the target. These jets:• Employ no moving parts• Greatly enhance jet erosive power resulting in reduced pumpingpower requirements• Cavitate at high ambient pressures and are thus particularly effectivein applications such as deep hole drilling The STRATOJET technology utilizes a passive acoustic resonance createdby flow interaction with the nozzle and upstream chambers to induce theSTRATOJET SELF RESONATING CAVITATING JETSRings of cavitationfrom a STRATOJET .Jet velocity fluctuations ofexcited and conventionalsubmerged jets.Acoustic resonance is achieved by matching theturbulent jet natural frequency with that of the speciallydesigned nozzle assembly, resulting in organized vorticalring structures.Comparison of erosion of aluminum samples underthe same conditions. STRATOJET nozzle (left),conventional nozzle (right) Vol= Volume Removal,H= Depth of Erosion. DP=8,000psi, Pamb= 1,500 psi,time=5min.Vol = 0.79cc H=229mils Vol = 0.08cc H=48mils High ambient pressure cell capable ofambient pressure up to 2,800 psi.Includes quartz view ports and variablespeed rock motion fixture.Jet translation chamber.Diesel pump: 150 hp,10,000 psi, 20 gpm.FACILITIESThe jet laboratory facilities include:• A 10,000 psi - 20 gpm diesel pump• Test tanks, hydraulic nozzle translator, and flowvisualization facilities• High ambient pressure cell (2,800 psi)• Air jet test facility• Acoustic, pressure and flow measurementequipment.• High speed photography• Bubble dynamics simulation facility• Erosion test facilitiesJet visualization cell.RRRRDYNAFLOW, INC.DYNAFLOW, INC.SERVOJETCAVIJETCAVIJET , STRATOJET , SERVOJET and DYNASWIRL are trademarks ofDYNAFLOW’S patented jet technology.2 11DYNAFLOW capabilities cover the range of basic and applied research,development, testing, and fabrication of water jet technology and systems. This includes:? Development of cavitating and resonating nozzles forimproved cutting, cleaning, and drilling applications? Custom nozzle design and fabrication? Development of specialized prototype systems? Test and evaluation? Erosion testing of materials? Experimental, numerical, applied, and fundamental studies? Scale model design and testing? Investigation of high ambient pressure applications? ConsultingDYNAFLOW INC.Jet Technologies for Enhanced ErosivityFiltration. Computational Fluid Dynamics.Cavitation testing. Erosion testing.STRATOJETDYNAFLOW Jet Technologies include:DYNASWIRLCavitating, both submergedand nonsubmerged jets.Cavitating, self resonating,submerged jets.Pulsed, self resonating,both submerged andnon-submerged jets.Cavitating, swirling,submerged jets.TMRRRRR R TMDYNAFLOW, INC. DYNAFLOW, INC. Applications¨ Deep hole drilling in hard rock¨ Pavement cutting¨ Cement removal from drill pipes¨ Marine fouling removal: underwater and dry dock¨ Diver held tools for underwater cleaning¨ Concrete removal¨ Removal of explosives and propellant from shellsand rocket motors¨ Paint stripping¨ Scale, rust, asbestos, non-skid coating removal¨ Material cavitation erosion testing¨ Underwater sound generation¨ Material droplet impact testing¨ Nozzles for specialized applications¨ Decontamination¨ Oxide ReductionCAVIJET CAVITATING LIQUID JETSThe CAVIJET technology deliberately inducescavitation in front of the nozzle to produce extremely high,very localized stresses on a surface due to bubble cavitycollapse in the jet stagnation region. This provides:• Greatly enhanced erosive power for cuttingand cleaning• Greatly reduced pumping powerrequirementsThe CAVIJET technology employs a variety ofnozzle geometries to induce cavitation in shear layers invarious portions of the jet. Versions of these jets can beoperated under both submerged and non submergedconditions.Velocity field obtained at two successive times in a computational fluiddynamic simulation of the microjet created during bubble collapse.4 9Steam generator fouling removal.Strippingbarnacles fromships hulls.Paint removal.Mechanical heart valvecarbon erosion test.Multi orifice cleaning tool.SERVOJETNozzle.Erosion on steel plate.Limestone Drilling cut.RRRRSandstone cut by CAVIJETCenterbody waterjet,operating at D p= 10,000 psi, at atranslation speed of 0.25 in/s.RDYNAFLOW, INC.DYNAFLOW, INC.Helicoidal cavitating vortexcore of a DYNASWIRL jet.Comparison of paint removal results forconventional and DYNASWIRL nozzlesfor a jet pressure of 200psiA is the conventional jet at 480seconds with no erosion,B is the DYNASWIRL Jet at 120 seconds,C is the DYNASWIRL Jet at 90 seconds, andD is the DYNASWIRL Jet at 45 seconds.DYNASWIRL nozzle fordental cleaning application.6 7SERVOJET SELF RESONATING PULSED JETSThe SERVOJET nozzle employs passive acoustic resonance to create aseries of high speed liquid drops, slugs, or vortex rings. This nozzle hasseveral advantages:• The SERVOJET provides enhanced erosive power for bothsubmerged and nonsubmerged (in-air) applications and employsno moving parts with minimal internal losses• Creates water hammer type pressure pulses due to drop impact• Removes various layers of surface contamination, coatings, orpaint without damage to underlying surfaces• Creates cyclic short duration loading at high frequencies• Produces larger outflow velocities and impact areas thancontinuous jets.Comparison of SERVOJET (A)and conventional jet (B) volumeremoval in simulated nuclearreactor steam generator fouling.Impact pressure of a steadyjet compared with that ofan excited interrupted jet.Strobe photo of a SERVOJETshowing slug formation. DYNASWIRL CAVITATING SWIRLING JETA new concept under development achieves cavitation at relatively lowjet velocities by employing a swirling flow. This jet requires much lower pres-sures and pumping power and minimizes the potential of damage to the under-lying surface being cleaned.RRRRRTMTMTMTMTMTMTM