A quantitative and time-resolved radiographic has been used to characterize direct-injection (Dl) gasoline sprays in near-nozzle region. The highly penetrative nature of x-rays promises the direct measurements of dense sprays that are difficult to study by visible-light optical techniques. Appropriate models were developed to determine the fuel volume fraction as a function of time and positions. The results also show quantitatively the strong asymmetry of the hollow-cone sprays studied here.

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