By F. Zhao, M.-C. Lai, D.L. Harrington
The method of gasoline injection, spray atomization and vaporization, cost cooling, mix coaching and the keep watch over of in-cylinder air movement are all being actively researched and this paintings is reviewed intimately and analyzed. the hot applied sciences resembling high-pressure, common-rail, fuel injection structures and swirl-atomizing fuel gas injections are mentioned intimately, as those applied sciences, in addition to computing device keep watch over services, have enabled the present new exam of an previous aim; the direct-injection, stratified-charge (DISC), gas engine. The earlier paintings on DISC engines that's proper to present GDI engine improvement is usually reviewed and mentioned.
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Additional info for Automotive spark-ignited direct-injection gasoline engines
This was assumed to be due to the reduction in friction resulting from the lower cylinder pressures. Another important issue that should be noted in GDI combustion system design is that the spray-induced flow field can exert a significant influence on the in-cylinder airflow field [145,146,343,368,372]. The secondary flows induced by the spray itself may lead to spray contraction depending on the droplet size and the in-cylinder ambient conditions [290,295,373]. Han et al.  used the KIVA code to predict the effect of a spray-induced flow field on the flow structure inside the combustion chamber of a GDI engine having a center-mounted injector.
T. ~au3 u! + d / " l v la OVtlZ ",_4 F. Zhao et al. / Progress in Energy and Combustion Science 25 (1999) 437-562 50 [ l _Small I C S ~ - I ~ I~ I Medium 40 467 Injection Pressure:7 Injection Amount:15 mm3 Pulse Duration:10 Hz Fluid: Laws 30 10 *-' 20 U ¢) Differences in ICS ,ram o (J \ / 10 k 20 40 Collector 60 80 Angle 100 deg. :10 MPa 14. , I-. BTDC-F (b) Fig.
This flow is generated in the radial direction inside the piston-to-head clearance when the piston is close to the compression TDC. Some of the features of swirl, tumble and squish and their roles in GDI combustion system are summarized as follows. • Swirl: o yields less viscous dissipation and is preserved longer into the compression stroke; o good for maintaining stratification; o intensified when combined with squish; o engine speed dependent, thus yields a limited operation zone for adequate fuel-air mixing.