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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
JPRMG ›› 2025, Vol. 45 ›› Issue (1) : 108-114.
PDF(1166 KB)
PDF(1166 KB)
Analysis of the Change of Throat Diameter Ablation Rate During the Operation of Solid Rocket Motor
({{custom_author.role_en}}), {{javascript:window.custom_author_en_index++;}}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.
solid rocket motor / nozzle / throat diameter / ablation rate {{custom_keyword}} /
Table 1 Design values and the rate of change of the measured values after test of different characteristic parameters of the engine nozzle inner face %表1 发动机喷管内型面特征参数设计值及试验后测量值变化率 |
| Characteristic parameters | Rate of change |
|---|---|
| Throat diameter | 16.4 |
| Inner diameter of nozzle outlet | 0.27 |
| Expansion ratio | 26.6 |
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PDF(1166 KB)
Table 1 Design values and the rate of change of the measured values after test of different characteristic parameters of the engine nozzle inner face %
Fig.1 Based on the test curve of the nozzle throat diameter calculation frameworkFig.2 Basic flow of differential evolution algorithmFig.3 Time dependent curve of untreated nozzle throat diameterFig.4 Variation curve of whistler throat diameter with time after treatmentFig.5 Time dependent curve of engine nozzle throat diameter ablation rate/
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