丁羟推进剂药浆流平性能实验与模拟
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内蒙古工业大学 理学院,内蒙古 呼和浩特 010051

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国家自然科学基金资助项目(11962021)


Experiment and Simulation of Leveling Performance of HTPB Propellant Slurry
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    摘要:

    为研究表观粘度及屈服应力对丁羟推进剂药浆流平性的影响,本研究对丁羟推进剂药浆进行了流平性实验,并提出滞止角的概念表征药浆的流平性,得出药浆屈服应力对滞止角的影响规律。同时采用Carreau粘度模型模拟了药浆流平过程并与实验结果进行了对比,并通过计算软件Flow 3D定量表征了丁羟推进剂药浆表观粘度、屈服应力单变量对流平性的影响。结果表明:丁羟推进剂药浆的流动角度与药浆流平时间的对数满足线性关系;不同时刻药浆流动角度的数值模拟与实验结果误差在5%以内,内侧流到终点的时间相差小于10%,验证了Carreau粘度模型求解药浆流平过程的可行性。丁羟推进剂药浆的表观粘度是影响流平速度的主要参数,当表观粘度由400Pa·s增大到1000Pa·s时,药浆流平所需时间由277s增加到871s;屈服应力决定药浆流平结束时滞止角的大小,当屈服应力由60Pa增大到120Pa时,滞止角由8.69°增大到14.98°,相应增加了72.4%。

    Abstract:

    Viscosity and yield stress have an important influence on the leveling performance of HTPB (Hydroxy-terminated polybutadiene) propellant slurry. In this study, through the leveling experiment of propellant slurry, it is concluded that slurry viscosity is the key criterion affecting leveling time and the influence law of yield stress on stagnation angle. At the same time, the leveling process of slurry is simulated by Carreau viscosity model and compared with the experimental results, and the effects of viscosity and yield stress on leveling performance were quantitatively characterized by computational fluid dynamics software CFD (Computational Fluid Dynamics). The results show that the error between the numerical simulation and experimental results of slurry flow angle at different leveling times is less than 7%, which verifies the feasibility of Carreau viscosity model to solve the slurry leveling process. The relationship between the flow angle of the studied slurry in the leveling tester and the natural logarithm of the slurry leveling time is close to linear. Univariate analysis was carried out on the viscosity of the slurry. When the viscosity increased from 400Pa·s to 1000Pa·s, the time required for slurry leveling increased from 315s to 825s; Univariate analysis was carried out on the yield stress of the slurry. When the yield stress increased from 60Pa to 120pa, the corresponding stagnation angle increased from 8.69°to 14.98°, with a corresponding increase of 72.4%.

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  • 收稿日期:2022-07-06
  • 最后修改日期:2022-08-11
  • 录用日期:2022-09-21
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