固体火箭发动机零维两相内弹道研究

Research on Zero-dimensional Two-phase Internal Ballistics of SRM

为方便应用两相内弹道流动模型对火箭发动机进行性能预示以及提高性能预示精度,利用火箭喷管内的两相流动性能计算公式,建立了零维两相内弹道模型,包括零维两相内弹道微分方程和平衡压强公式,给出了模型中涉及到的两相特性参数的计算方法。相比于一维两相内弹道模型,该零维内弹道模型简单且满足必要的精度,适于工程应用的快速估算。利用该模型对某远程火箭发动机进行了内弹道计算与分析,计算结果与实验数据吻合良好,表明该两相内弹道模型可以有效地降低纯气相模型引起的理论与实际之间的模型偏差,有利于快速计算固体推进剂火箭发动机的两相内弹道参数以及提高预示精度。

To predict internal ballistic properties with two-phase flow for convenience and to improve prediction precision of internal ballistics in solid rocket motor（SRM） ,a model of zero-dimensional two-phase internal ballistics was built. The model includes internal ballistic differential equation and corresponding equilibrium pressure formula,and the computational methods of two- phase property parameters in the model were developed. Compared with one-dimensional two- phase internal ballistic model, the model is very simple and more suitable to quick computation in project applications,and more accurate. Based on the model,an internal ballistic computation and analysis for a long-range solid rocket engine were carried out. The computed results accord well with experimental data. The zero-dimensional two-phase internal ballistic model can availably reduce theoretical error caused by single-gas-phase model. By the model, two-phase internal ballistic properties can be quickly computed, and the prediction precision of internal ballistics in SRM can be improved.