塞锥后体气膜冷却对轴对称塞式喷管红外辐射和气动性能的影响

doi:10.7527/S1000-6893.2015.0119

Abstract

Abstract:

A series of computations is conducted to investigate the effects of plug rear-body film cooling on the infrared radiation and aerodynamic performance of axisymmetric plug nozzle under the primary flow conditions (primary mass flow rate of 130 kg/s and total temperature of 920 K) as well as the cooling flow temperature of 480 K. The film-hole arrangement, film-holes inclination angle (ranging from 15° to 30°) and cooling air usage (limited in 3% of primary mass flow rate) are chosen as the influencing factors for comparison. The results show that the film cooling on plug rear-body has a very weak influence on the nozzle thrust coefficient. The cooling action on plug rear-body with cooling air usage of one percent of the primary mass flow rate is capable of having approximately 50% infrared radiation intensity reduction relative to the un-cooled nozzle. As the cooling air usage is increased to 3% of the primary mass flow rate, 60% infrared radiation intensity reduction is achieved; however, the total pressure recovery coefficient is decreased more significantly. Given the same cooling air usage, the multi-holes arrangement with small row-pitch seems to be more reasonable because it results in the nearly same infrared radiation suppression but low total pressure recovery coefficient reduction in comparison with the multi-hole arrangement with large row-pitch. The decrease of film-hole inclination angle from 30° to 15° has little influence on reducing surface temperature of the plug rear-body as well as improving total pressure recovery coefficient of the nozzle.

Key words: exhaust nozzle, axisymmetric plug nozzle, plug film cooling, infrared radiation, aerodynamic performance

CLC Number:

V231

ZHANG Jingzhou, WANG Xu, SHAN Yong. Effects of plug rear-body film cooling on infrared radiation and aerodynamic performance of axisymmetric plug nozzle[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015, 36(8): 2601-2608.

References

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Effects of plug rear-body film cooling on infrared radiation and aerodynamic performance of axisymmetric plug nozzle

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