No abstract

High-pressure multi-hole injectors for direct-injection spark-ignition engines offer certain flexibility in spray directionality by selecting the number and angle of the nozzle's holes to suit the design of a particular combustion chamber. However, the spray's pattern can change significantly for injector-body temperatures representative of real engine operation at low-load conditions with injection strategies in the early intake stroke. This is due to rapid phase change effects from flash boiling of the high-volatility components of gasoline. This work presents results from an optical investigation into the effects of injector-body temperature and back pressure on the pattern of spray formation, especially when coupled to different levels of ambient turbulence. Specifically, gasoline and iso-octane fuels were tested in the range of 20-120 °C