首页|Study of active pre-chamber jet flames based on the synergy of airflow with different nozzle swirl angle
Study of active pre-chamber jet flames based on the synergy of airflow with different nozzle swirl angle
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NETL
NSTL
Elsevier
This study investigated the formation of an active prechamber (APC) jet flame based on the synergy of airflow. Asingle-cylinder gasoline direct injection engine installed with an APC was operated under ultra-lean conditionswith a lambda value of 2.5. Different APC structures with nozzle swirl angles ranging from 0◦ to 30◦ weredesigned to produce different flow fields and mixture formations. The results showed that APCs with largernozzle swirl angles generated smaller wall films and faster fuel–air mixing, forming a more evenly mixed distributionin the APC’s top region, which improved the uniformity of the flame jets from different APC nozzleswith a smaller variance in jet turbulence kinetic energy and jet velocity. Tumble flow played a dominant role inAPCs with a small nozzle swirl angle, and the relatively weak swirl flow field inside the APC resulted in morelocally rich mixture regions, reducing the ignition capability of the APC jet flame. APCs with a large nozzle swirlangle can accelerate the evaporation and mixing process of the fuel near the top region of the APC with a strongerswirl, and the wall film diffuses to the central area of the duct through the airflow.
NETL
NSTL
Elsevier
