Effects of Ambient Pressure and Injection Conditions on Temperature Dependency of Ignition Delay in Fuel Sprays

Abstract

Experimental study was carried out by using a constant volume vessel in order to study the effects of ambient pressure and injection conditions on temperature dependency of ignition delay in n-heptane spray. The results show that at a low ambient pressure the NTC behavior with accompanying two stage ignition is observed. At a high ambient pressure, higher injection pressure causes shorter pressure recovery delay. This tendency is also observed at a low ambient pressure. However, at a temperature in the NTC region, hot flame is delayed by the enhancement of mixing.