Study on the Influence of Insulation Length on Radial Heat Transfer of Throat Plug Engine

LOU Yongchun; ZHAO Zhi; ZHAO Yu; MA Xinjian; WEN Xiongfei

doi:10.15892/j.cnki.djzdxb.2023.05.006

Journal of Projectiles, Rockets, Missiles and Guidance >

2023 , Vol. 43 >Issue 5: 39 - 44

DOI: https://doi.org/10.15892/j.cnki.djzdxb.2023.05.006

Study on the Influence of Insulation Length on Radial Heat Transfer of Throat Plug Engine

LOU Yongchun ,
ZHAO Zhi ,
ZHAO Yu ,
MA Xinjian ,
WEN Xiongfei

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Shanghai Space Propulsion Technology Research Institute, Shanghai 201109, China

Received date: 2023-01-11

Online published: 2024-12-30

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Abstract

A series of three-dimensional nozzle models with different insulation layer lengths are established for numerical simulation calculation to address the phenomenon of the temperature inside the non coaxial throat plug engine nozzle not decreasing but rising after the length of the insulation layer increased. The temperature distribution of the throat plug and the pressure, velocity, and temperature distribution of the surrounding gas are obtained. By analyzing the flow field in the slit between the insulation layer and the throat plug, it is found that there is a phenomenon of gas flow around the throat plug in the slit. This flow is influenced by the pressure difference between the inlet above and below the slit, and can be divided into two types: unilateral flow and bilateral flow. An excessively long insulation layer will cause an increase in the inlet pressure difference between the upper and lower parts of the slit, and the gas flow pattern will change from bilateral flow to unilateral flow. The flow and heat transfer effect will be enhanced, and the temperature of the throat plug structure will increase. By comparing the temperature of the throat plug under two different forms of gas flow, the response relationship between the length of the throat plug insulation layer and the temperature distribution of the structure is obtained, which improves the prediction accuracy of the temperature distribution of the throat plug structure.

Key words： throat plug engine; flow heat transfer; thermal protection; slit; numerical calculation

Cite this article

LOU Yongchun , ZHAO Zhi , ZHAO Yu , MA Xinjian , WEN Xiongfei . Study on the Influence of Insulation Length on Radial Heat Transfer of Throat Plug Engine[J]. Journal of Projectiles, Rockets, Missiles and Guidance, 2023 , 43(5) : 39 -44 . DOI: 10.15892/j.cnki.djzdxb.2023.05.006

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