| 摘要: |
| 针对导弹水下发射时喷管的气体流动问题 ,建立了水下喷管流的简化模型 ,定性地研究水环境的惯性对水下喷管内气体流动造成的阻滞作用。计算显示受阻滞流量ΔQ及受阻滞时间Δt和喷管的喉部面积At 呈幂函数关系 ,固定其他参数仅改变水深 ,ΔQ及Δt和进口处气体的滞止压力p0 与当地水下静压之间的压力差也有幂函数关系。结果表明喷管所处的水下深度越大 ,喷管内气体流动受阻滞状况也就越严重 ,而减小喉部面积At 和适当增加膨胀比Ab/At 以及增加滞止压力p0 ,均有助于改善水环境对喷管喷出气体造成的阻滞状况。 |
| 关键词: 潜射导弹 水下点火 喷管气流 数学仿真 |
| DOI： |
| 分类号:V525 |
| 基金项目:中国科技大学青年基金 !(KB132 3);留学回国人员基金!(KB132 4) |
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| Nozzle flows of the missile launching under water |
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Wang Xiao hong1, Chen Yi liang1, Li Qian2, Liu Chang jiang2
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1.Dept. of Thermal Science and Energy Engineering, China Univ. of Science and Technology, Hefei 230026,China;2.Beijing Inst.of Aerodynamic Beijing 100074,China
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| Abstract: |
| A simple model was proposed to study the flows in the Laval nozzle under water. Numerical simulations show that there are power law relations for the obstruction mass flows Δ Q and the obstruction interval Δ t with the throat area A t of nozzle: Δ Q ∝ A 1.5 t ,Δ t ∝ A 0.5 t , and with the difference between the stagnant pressure p 0 and the local static pressure: Δ Q andΔ t ∝｛[ p 0-( p 1+ ρ w gH )]/ ρ w ｝ -0.76 when only changing the depth H . It is reasonable that the obstruction is stronger when increasing the depth H . Nevertheless, the obstruction can be decreased by decreasing the throat area A t, or increasing ratio of exit to throat areas A b/ A t or increasing stagnant pressure p 0. |
| Key words: Submarime launched missle Underwater firing:Nozzle flow Mathematical Simulation. |
