ZHANG Bo, JI Hong-hu, LUO Ming-dong, et al. Research of the influence of aspect ratio on infrared suppressing characteristics of rectangular nozzles[J]. 2007, 22(11).
ZHANG Bo, JI Hong-hu, LUO Ming-dong, et al. Research of the influence of aspect ratio on infrared suppressing characteristics of rectangular nozzles[J]. 2007, 22(11).DOI:
Based on a fanjet currently used in an advanced unmanned vehicle
an axisymmetric nozzle AR0 of 4.3 expansion ratio was obtained.Under the same exit area
five rectangular convergent nozzle models(AR1AR16)of different W/H(W/H=116) were experimentally investigated.The infrared radiation of nozzles and hot jet streams at 35 μm were tested using Fourier Infrared Spectroscope.The results indicate that the magnitude of infrared radiation from rectangular nozzle is smaller than axisymmetric one
and the infrared suppressing effect of rectangular nozzles improves with the increase of aspect ratio.