Analysis of the Change of Throat Diameter Ablation Rate During the Operation of Solid Rocket Motor

ZHANG Nan; YE Yifan; PAN Ying; LIU Xinyao; MIAO Yuanyang

doi:10.15892/j.cnki.djzdxb.2025.01.015

Journal of Projectiles, Rockets, Missiles and Guidance >

2025 , Vol. 45 >Issue 1: 108 - 114

DOI: https://doi.org/10.15892/j.cnki.djzdxb.2025.01.015

Analysis of the Change of Throat Diameter Ablation Rate During the Operation of Solid Rocket Motor

ZHANG Nan ,
YE Yifan ,
PAN Ying ,
LIU Xinyao ,
MIAO Yuanyang

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Xi'an Mordern Control Technology Research Institute,Xi'an 710065,Shaanxi,China

Received date: 2024-03-15

Online published: 2025-03-12

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Abstract

Solid rocket engine nozzle throat liner needs to withstand the ablation, erosion of high temperature and high-pressure gas and it nozzle throat diameter ablation rate has a high probability being non-linear during the whole working process. At present, research about nozzle ablation both domestic and abroad is mainly focused on numerical simulation analysis and ablation test of the nozzle body, however, there's a lack of investigation on the link between the nozzle ablation process and the function of solid rocket motor. This paper is based on the differential evolution algorithm and radial basis function neural network, and established a method for calculating the ablation rate of the nozzle throat diameter based on the test curve of solid rocket motor. Based on the ground static test results of solid rocket motor, the curve of nozzle throat diameter ablation rate changing with motorworking time was obtained. The results showed that the ablation rate of the nozzle throat diameter was small in the early stage of the motor operation, and gradually increased with the increase of the working time, as the temperature of the nozzle throat increased, this caused the ablation rate increased, after a period of time, the temperature of the throat liner became constant, and the nozzle ablation rabe is maintained at 0.2 mm/s. And after the ablation of the surface of throat liner was fully completed, the inner surface was exposed; the ablation rate would increase again.

Key words： solid rocket motor; nozzle; throat diameter; ablation rate

Cite this article

ZHANG Nan , YE Yifan , PAN Ying , LIU Xinyao , MIAO Yuanyang . Analysis of the Change of Throat Diameter Ablation Rate During the Operation of Solid Rocket Motor[J]. Journal of Projectiles, Rockets, Missiles and Guidance, 2025 , 45(1) : 108 -114 . DOI: 10.15892/j.cnki.djzdxb.2025.01.015

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