A numerical investigation is performed to study cooling and infrared radiation suppression of the plug trailing-body of a two-dimensional plug nozzle at a primary flow total temperature of 920 K and a cooling flow temperature of 470 K. The effects of the multi-hole perforated percentage (ranging from 1% to 4%), cooling air usage (limited in 4.3% of the primary mass flow rate) and vector angle (ranging from 0° to 20°) on cooling and infrared radiation suppression of the plug trailing-body are analyzed. The results show that the plug trailing-body cooling has an effective role in decreasing the surface temperature and suppressing infrared radiation intensity. The multi-hole perforated percentage of 2% seems more reasonable. Once coolant usage is increased beyond 2.85% of the primary mass flow rate, the increase of coolant usage has a weak influence on further reduction of surface temperature. The cooling action on the plug trailing-body with coolant usage of 2.85% of the primary mass flow rate is capable of suppressing the infrared radiation intensity about 50% relative to the un-cooled nozzle on the horizontal detective plane. On the vertical detective plane, the cooling action on the plug trailing-body shows more significant influence on infrared radiation suppression. The vector angle has a weak influence on surface temperature distribution. However, the distribution of infrared radiation is seriously affected by vector deflection.
ZHENG Jiansheng
,
SHAN Yong
,
ZHANG Jingzhou
. Cooling and infrared radiation suppression effect of plug trailing-body of two-dimensional vector plug nozzle[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017
, 38(12)
: 121384
-121384
.
DOI: 10.7527/S1000-6893.2017.121384
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