Discrimination for ablative control mechanism in solid-propellant rocket nozzle

Discrimination for ablative control mechanism in solid-propellant rocket nozzle
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固体火箭喷管烧蚀控制机构判别

DOI:
10.1007/s11431-009-0274-2
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发表时间:
2009-09
期刊:
Science in China Series E: Technological Sciences
影响因子:
--
通讯作者:
--
中科院分区:
其他
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--
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固体火箭发动机喷管内的烧蚀是一个化学、传热、传质耦合的过程。基于传热传质理论、气动热力学和热化学动力学,建立了热化学烧蚀模型。模拟了不同氢气浓度、频率因子和活化能条件下喷管内的热流场和化学烧蚀。计算结果表明,在高温高压燃烧条件下,H2的浓度和活化能可以引起控制机理的转变,而H2的频率因子的影响很小。烧蚀控制机制的判别与H2浓度和活化能有关。该研究对固体火箭设计中的烧蚀和热防护问题具有一定的指导意义。
The ablation in solid-propellant rocket nozzle is a coupling process resulted by chemistry, heat and mass transfer. Based on the heat and mass transfer theory, the aero-thermo-dynamic, and thermo-chemical kinetics, the thermal-chemical ablation model is established. Simulations are completed on the heat flow field and chemical ablation in the nozzle with different concentrations, frequency factors and activation energy of H2. The calculation results show that the concentration and the activation energy of H2can provoke the transformation of control mechanism, whereas the influence brought by the frequency factor of H2is feeble under a high-temperature and high-pressure combustion circumstance. The discrimination for ablative control mechanism is dependent on both concentration and activation energy of H2. This study will be useful in handling ablation and thermal protection problem in the design of solid-propellant rocket.
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影响因子: --
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