抄録
Observations of DME spray in a constant volume vessel under CI engine-like density conditions were conducted to understand the breakup and atomization behavior in the near-nozzle field. Ultra-high speed and microscopic images of DME spray were obtained using a combination of a telescopic lens and short exposure time of 18nsec with nano-flash-light. As a result, fuel droplet and breakup were not observed, unlike diesel fuel spray. The outer edge of the spray with large turbulence was break off from the main spray and rapidly evaporated. The contraction flow at injection nozzle outlet was not observed.
