关键词: 喷气发动机燃料;高空点火

Abstract: Investigation of high-altitude ignition performance of several China-made jet fuels with different properties has been conducted at a simulated altitude facility. Jet fuels were tested in a small pilot combustion chamber taken from an existing aeroengine. The fuels consist of Da-Qing oil,Da-Gang oil, Nen-Jing oil, Gu-Dao oil (so called as high density fuel) as well as a compound oil. Test results show that the lower the fuel density (its viscosity is also lower,but vapour pressure is higher), the better the high-altitude ignition performance.The high-altitude ignition performance of high density fuel is rather poor, but can be significantly improved by mixing it with a small quantity of low density oil(about 10 percent). Using a small flow number atomizer may obviously improve the lean ignition limit of the high density fuel,but the ignition velocity-pressure limit and the rich ignition limit are shrunk.Test results also show that prevailing theory model for spark ignition is feasible.

Key words: Jet engine fuel;Air ignition