Optical Methodology for Characterization of a Gasoline Direct Injection Closing Event Droplet Distribution

Paper #:
  • 2017-01-0858

  • 2017-03-28
The characteristics of gasoline sprayed directly into combustion chambers are of critical importance to engine out emissions and combustion system development. The optimization of the spray characteristics to match the in-cylinder flow field, chamber geometry, and spark location are critical in development of an engine combustion strategy. Furthermore, the presence of liquid fuel during combustion in Spark-Ignition (SI) engines causes increased HC emissions. Euro 6, LEVIII, and US Tier 3 emissions regulations reduce the allowable particulate mass significantly from the previous standards. LEVIII standards reduce the acceptable particulate emission to 1 mg/mile. With the continuing strictness of the standards the quantity of fuel dispensed during the closing event of a Direct Injection Spark Ignition (DISI) injector have become an important factor in the spray preparation. The optimal GDI strategy is to vaporize the correct amount of fuel just in time for optimal power output with minimal emissions. The closing phase of GDI injectors is crucial to this task. This paper presents the preliminary results from a novel method to characterize the closing phase of GDI injectors. A Design of Experiments (DOE) was used to determine the effect of pressure, temperature, and pulse-width of the fuel spray after the closing event. It was determined that the primary source of controlling the droplet size and the mass post injector closing for a given injector was the temperature. This paper will outline the results of the DOE for a specific injector, and describe the method used to characterize the injector closing behavior.
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