摘要
利用高精度热物性测量系统对二甲醚与柴油的互溶性进行了实验研究。实验系统中温度覆盖范围为-80～300℃，测量不确定度小于±0．002℃；压力测量范围为0～2MPa，测量不确定度小于±0．7kPa。测量了10％、20％、30％的二甲醚／柴油混合燃料的饱和蒸气压力和临界互溶温度。研究表明：二甲醚与柴油互溶性良好。混合燃料的饱和蒸气压力低于纯二甲醚蒸气压，并且随柴油所占混合组分的增加而减小，混合燃料蒸气压的降低有利于避免发动机燃油供给系统中的气阻；此外，混合燃料的临界互溶温度随二甲醚所占混合比的增加而降低．有利于燃用混合燃料的发动机在更低的环境温度下正常运行。
Experiments were conducted to determine the intersolubility of Dimethyl Ether（DME） and diesel fuel in a thermo-physical property measuring system with high accuracy, which consists of temperature measurement system （measurement range - 80 ～ 300 ℃ with uncertainty less than ± 0. 002 ℃） and pressure measurement system （measurement range 0～2 MPa with uncertainty less than ±0.7 kPa）, The RVP （Reid vapor pressure） and the critical compatible temperature of the mixed fuels of DME and diesel fuel at various mass fractions （10%, 20% and 30 %） were measured. The experimental results indicate that DME can be well soluble in diesel fuel. The RVP of the mixed fuel is lower than that of pure DME at certain temperature and decreases with the increase of diesel fuel fraction in DME. The lowering of RVP is helpful to the elimination of vapor block in the fuel supply system. In addition, the critical compatible temperature decreases with the increase of DME fraction in diesel fuel, and this is beneficial to engine operation at low ambient temperature.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2006年第2期122-126,共5页
Transactions of Csice
基金
国家自然科学基金资助项目(50122166
50136040)
科技部重大基础研究资助项目(2001CB209207)
