摘要
设计了一种用于柴油机稳态工况下微粒测量的部分流稀释取样系统 ,该系统稀释通道内径为 1 50mm,全长为 2 350 mm,稀释通道内稀释排气流量为 556 m3 / h,雷诺数为 73 0 0 0 ,稀释比用 CO2 分析仪测量发动机排气和稀释通道内稀释排气的 CO2 浓度来计算。
A partial flow dilution sampling system has been developed as a device for measuring the quantity of particulate matter emissions in the exhaust gas from automotive diesel engine in steady state operating conditions.The dimensions of the tunnel were 150 mm diameter and 2 350 mm length.A fraction of the total exhaust gas is drawn into the tunnel through particle transfer tube by low pressure in the mixing orifice and mixed with clean air in the tunnel.The volumetric flow rate in the tunnel as delivered by a vacuum fan was 556.65 m 3/h,corresponding to a Reynolds number of 73 000.The dilution ratio,defined as the ratio of the exhaust gas/air mixture flow in the tunnel to the exhaust gas flow into the tunnel was determined by CO 2 concentrations in the diluted exhaust and in the raw exhaust gas.A good repeatability of the system was testified.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2000年第3期250-253,共4页
Transactions of Csice
基金
国家自然科学基金! ( 596 76 0 2 8)
中国高等教育博士学科点专项基金! ( 970 1850 6 )资助项目
关键词
柴油机
微粒
稀释取样系统
排气
Diesel
Particulate matter
Dilution sampling system
