直喷汽油单孔喷油器喷雾微观结构特性的研究

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1、ᓫᘤ᪀ᱯឋḄẆTheMicrostructureCharacteristicsoftheSprayofaDirect-injectionGasolineSignal-holeInjector：Ẇ：!ᢣ#ᦟ%：&'ᐰ)ᦟᣴᜩ,ᜧ./▾12314ᓝ1ᨴឋᡠᕈḄᦻᙠᢣḄẆ!ḄẆᡂ#，◀&ᦻ'ᱯ)*+᪗-./0ᜐ᜜，ᦻ'3ᒹ5ᐸ789:⊤ᡈ=ᑏ?ḄẆᡂ#，@3ᒹ5AB!ᜩDᜧᡈᐸ7ᦟGH᪀ḄᡈJKLMᵨ?Ḅᩞᧇ。RᡃTUḄUVWẆᡠXḄYZ[ᙳ

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3、：ÏÐ&¦§¬ᓫÒ§ᘤ§³ÔÕ·ᜧᵨx~Ö×ᐸᐝÙÚÛ；ᑭᵨMATLABÞᑏ&§³ßàáâã)ᑖ᪆åæ；`ç?«èéHê᤬&3U§ᩩḄÔÕ·ᜧ§³í。îí§³:Î?å'，ïḼñòḄóᓄ，§³┵ö9ᔊ&øùú、ᜧûüýú、üý⊦ùúÿú¸▤。ᙠéUḄ§½，ïḼ§½Ḅ*，§³ᡂiḄᔣè。ᙠ«Ḅ§½，§³┵öïᓄᦪḄóᓄ9ᔊ&ᓄú、?ú½ú。§³┵öᑮᓄ§½Ḅ´ïᓄᦪ*ᕈᐜù¡*Ḅ。ïḼ§½Ḅª«，⊤☢üü!ó，Lüý⚣᳛*，$L´§³%ẚ¿。ᙠ§ᘤ┐▀()?å'，®§

4、*$§Òᜐ++,§，`ᨬ.ᡂᜧ/。§³'3Uú0Ḅ®ẚ¿å3U。9?1ẚ¿¡，ᙠ§Ò2▬îᜧ45Ḅ67®8。ïḼ§½Ḅ*，ᙠ§ᘤËéU9ᜐḄ®8**。:;ᔣËᔣ，ïḼR§Ò'<2=>Ḅ*，®?，ᙠRᕜÉABC☢ᜐᙠᐙᑖẚ¿Ḅ/。§³?å'᜜EF/ᑖG3ᙳᒴ.&§³“IJK”ÿ᪀Ḅ。/ḄL1ẚ¿?åMNẚ¿Ë,ᐳḄᔠẚ¿,。§³íᑁUñᙠPឋᔣᑮÆᔁᔾᵨSᔣTýḄF/。ᐵUV：§ᘤ，¬，§³，ẚ¿，ÔÕ·ᜧABSTRACTDirectinjectiontechnologyisoneoftheeffec

5、tivewaystoimprovethefueleconomyofsparkignitiongasolineengines.Fuelsprayisakeyfactorinfluencingthecombustionandemissioncharacteristicsofdirect-injectionsparkignition(DISI)gasolineengines.Therefore,itissignificanttoinvestigatethespraybreakupprocessesundertheconditionsofhighinjectionp

6、ressure.Investigationwasconductedasfollow:Aspecificconstantvesselusedforthemicroscopicmagnificationofthegasolinesprayofasingle-holeinjectorfordirectinjectionanditsopticalsystemweresetup.OnthebasisoftheMATLABsoftware,acodetorecognisethefeaturesofsprayimageswasprogrammed.Microscopics

7、prayimageswererecordedbymeansofahigh-speeddigitalcamera.Theresultsshowthat,Thedevelopmentofnear-fieldsprayconeangleclosetotheinjectorexitexperiencessharpdecrease,intensivefluctuation,slightfluctuationandgradualrisewithtime.Injectionpressuredifferenceevidentlyaffectstheverticalveloc

8、ityofsprayatthebeginningof