亚声速空气横流中亚/超临界煤油射流特性

The jet behaviors of sub- and super-critical RP-3 aviation kerosene in a subsonic air crossflow were experimentally investigated. Under constant air parameters and fuel mass flow rate conditions，shadowgraph imaging technology was used to visualize the transverse jet structure within the fuel injection temperature range of 352 K to 750 K. The results showed that the breakup/disintegration regime of RP-3 jet gradually changed from mechanical breakup to unchocked flash-boiling，chocked flash-boiling and supercritical regime as the fuel injection temperature increased. During this process，the jet dense core and atomization zone underwent a decrease in length of over 11 and 52 times the nozzle diameter，respectively，and a decrease in coverage of over 6 mm² and 141 mm²，respectively. Furthermore，with the increase of the injection temperature，the penetration depth of the jet gradually increased in the mechanical breakup regime，decreased in the unchocked flash-boiling regime，and remained essentially unchanged in both the chocked flash-boiling and supercritical regimes.