破碎浮冰環(huán)境下結(jié)構(gòu)物傾斜入水空泡演化特性實驗研究

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中圖分類號：O354;TJ012.3 國標學科代碼：13025 文獻標志碼：A

Abstract：Toinvestigate the influenceof thedensityofcrushed iceregiononthecavityevolutionofastructure，anoblique water-entry experiment of the structure was conducted byhigh-speed photography technology under different crushed ice cover densities.Moreover，bycomparing the water-entryprocess oftheoblique structure in varying densities ofcrushed ice cover，the influenceofcrushedicecoverdensityoncavityevolution duringtheoblique water-entryprocessofthestructure was obtained.Results indicate that during the cavity expansion， the presence of crushed ice reduces the cavity diameter by impedingtheoutward expansionof thefluidnear thefreesurface，compared withtheice-freeenvironment.Whenthecavity closes，crushedicealsoimpedes theinwardcontractionof thefreesurfacefluidand prolongs thecavity expansiontime.The augmentationinthetotal volumeofairwithin thecavityresultsina decrementof the pressure diferentialbetweentheinside andoutsideofthecavity，ultimately leading toaretardation inthecavityclosuretime.Inconditions of lowercrushed ice densities，jetspointtotheinteriorof thecavitywhenthecavitycoapses.Asthecoveragedensityofcrushedicegradual increases，the impedance exerted by the crushed ice on the inward contraction of fluid at the free surface progressively intensifies.This enhancedobstruction fromthe crushedice further prolongs thecavityclosure time andconcurrntlyaugments itslengthand maximumdiameter.Besides，underconditionsofhighercrushedicecoverdensities，thecavitywallis wrinkled by the irregular impact of thefluid. As the submerged depth of the structure increases，the cavity undergoes a dep necking underthe influenceof ambient pressure.As thecoverage densityof crushed ice gradually increases，thevelocity of the underwater motion of the structure shows a trend offaster decay compared with those in ice-free environments.

Keywords：crushed floating ice environment； oblique water-entry； water-entryexperiment；cavityevolution；structure

在北極的復(fù)雜環(huán)境中，全球氣候變暖致使海面上存在大量破碎浮冰，破碎浮冰的存在會影響結(jié)構(gòu)物的入水過程。（剩余11464字）