The high-altitude ignition performance of highdensityfuel is rather poor, but can be significantly improved by mixing it with a small quantity of low density oil(about 10 percent).
大比重油的高空点火性能相当不良，但用少量优质大庆油掺混（约百分之十）后可得到显著改善。
2
Using a small flow number atomizer may obviously improve the lean ignition limit of the highdensityfuel, but the ignition velocity-pressure limit and the rich ignition limit are shrunk.
使用小流量数喷嘴可显著改善大比重油的贫油点火性能，但点火的压力-速度边界和富油点火边界缩小了。
3
Fuel cells attract human's more and more interesting by the virtue of high energy density, high power density and no pollution.