车用发动机
車用髮動機
차용발동궤
2015年
4期
70-75
,共6页
徐长建%董伟%于秀敏%何玲%孙平%麻斌
徐長建%董偉%于秀敏%何玲%孫平%痳斌
서장건%동위%우수민%하령%손평%마빈
汽油机%缸内直喷%颗粒%粒径%浓度
汽油機%缸內直噴%顆粒%粒徑%濃度
기유궤%항내직분%과립%립경%농도
gasoline engine%in-cylinder direct injection%particle%particle size%concentration
为了研究缸内直喷汽油机颗粒的热物理特性 ,基于某发动机试验台架设计了二级热稀释系统.采用EEPS3090粒谱仪对不同稀释比、加热温度、蒸发温度下的颗粒粒径分布和浓度进行了试验研究.试验结果表明 :不同稀释比下颗粒数量浓度随粒径的增大呈现对数正态双峰分布 ,不同加热温度和蒸发温度下颗粒数量浓度随粒径增大呈现三峰分布 ;较大稀释比对核态数量总浓度影响较大 ,加热温度高于200 ℃后颗粒数量浓度趋于稳定 ,蒸发温度对积聚态颗粒有较大影响.
為瞭研究缸內直噴汽油機顆粒的熱物理特性 ,基于某髮動機試驗檯架設計瞭二級熱稀釋繫統.採用EEPS3090粒譜儀對不同稀釋比、加熱溫度、蒸髮溫度下的顆粒粒徑分佈和濃度進行瞭試驗研究.試驗結果錶明 :不同稀釋比下顆粒數量濃度隨粒徑的增大呈現對數正態雙峰分佈 ,不同加熱溫度和蒸髮溫度下顆粒數量濃度隨粒徑增大呈現三峰分佈 ;較大稀釋比對覈態數量總濃度影響較大 ,加熱溫度高于200 ℃後顆粒數量濃度趨于穩定 ,蒸髮溫度對積聚態顆粒有較大影響.
위료연구항내직분기유궤과립적열물리특성 ,기우모발동궤시험태가설계료이급열희석계통.채용EEPS3090립보의대불동희석비、가열온도、증발온도하적과립립경분포화농도진행료시험연구.시험결과표명 :불동희석비하과립수량농도수립경적증대정현대수정태쌍봉분포 ,불동가열온도화증발온도하과립수량농도수립경증대정현삼봉분포 ;교대희석비대핵태수량총농도영향교대 ,가열온도고우200 ℃후과립수량농도추우은정 ,증발온도대적취태과립유교대영향.
To analyze the thermal physical property of GDI engine ,a two-stage thermo-dilution system was developed .The particle size distribution and concentration were measured under different dilution ratios ,heating temperatures and evaporation temperatures with the EEPS 3090 particle size spectrometer .The results show that the concentration of particle number shows a lognormal bimodal distribution under different dilution ratios and shows trimodal distribution under heating temperatures and evaporation temperatures with the increase of particle size .Moreover ,large dilution ratio has great influence on the total con-centration of nuclear mode particle number ,heating temperature higher than 200 ℃ makes the concentration of particle number stable and evaporation temperature has important influence on accumulation mode particle number .