Simulation on the flow characteristics of multi-stage divergent combustion chamber of combustion light gas gun
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摘要: 为了分析多级渐扩型燃烧室结构对燃烧轻气炮氢氧燃烧特性的影响, 通过计算流体力学方法, 分别对采用传统圆柱型燃烧室和多级渐扩型燃烧室的燃烧轻气炮氢氧燃烧发射过程进行数值模拟。对比结果表明, 多级渐扩型燃烧室结构能够明显地减小燃烧室压力波动幅度, 提高氢氧燃烧稳定性; 多级渐扩型燃烧室内形成回流区, 可以减小气流轴向运动速度; 火焰扩展形态与渐扩型结构相吻合, 燃烧反应区表面变化平稳; 多级渐扩型燃烧室结构对氢氧火焰传播过程和压力波动现象有着重要影响。Abstract: In order to analyze influences of multistage divergent chamber structure of combustion light gas gun on the combustion characteristics of hydrogen-oxygen mixed gas, the propellant combustion launching process in the multistage divergent chamber and standard cylinder chamber combustion light gas gun was simulated with the computational fluid dynamics method respectively.Comparative results show that the pressure fluctuations in the chamber of combustion light gas gun are significantly reduced by using the multistage divergent combustion chamber structure, while the stability of hydrogen-oxygen mixed gas combustion is improved.Recirculation zones would be formed in the multistage divergent chamber, which can reduce the flow axial velocity.The flame shape and the divergent chamber structure coincide with each other during its expanding.The surface of combustion zones develops steady.The multistage divergent combustion chamber structure has considerable impact on the flame expansion process and pressure fluctuations in the combustion chamber.
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图 1 燃烧轻气炮多级渐扩型燃烧室结构
Figure 1. Multistage divergent chamber structure of combustion light gas gun
图 2 弹底压力数值模拟与实验结果对比图
Figure 2. Comparison of the projectile base pressure between simulation and experiment
图 3 单点点火时燃烧室结构对膛底压力和弹底压力的影响
Figure 3. Influences of chamber structure on chamber bottom and projectile base pressures with single-point ignition
图 4 多点点火时燃烧室结构对膛底压力和弹底压力的影响
Figure 4. Influences of chamber structure on chamber bottom and projectile base pressures with multi-point ignition
图 5 t=3.36 ms时4级渐扩型燃烧室流场速度矢量和流线分布图
Figure 5. Velocity vector and streamline distribution of four-stage divergent chamber flow field at t=3.36 ms
图 6 不同燃烧室结构内3个记录点的轴向速度随时间变化曲线
Figure 6. Velocity curve of the three probe points in different chamber structures
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