Simulation of Inner Trajectory Flow Field for Pneumatic Imbalance Torpedo Launcher
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摘要: 为详细、准确并直观地描述气动不平衡式鱼雷发射器内膛压及鱼雷出管速度分布，建立了鱼雷发射器内部流场的数学模型，基于Fluent软件的动网格技术对其进行了数值仿真，为精确描述水下鱼雷发射的管内过程提供了一种新方法。仿真结果表明，鱼雷在发射器内运动的整个过程中，发射器内的压强在空间上的分布不同：在发射开始阶段，由于鱼雷与发射器环形间隙的节流，压强从入口开始逐渐减小；随着鱼雷运动，环形间隙逐渐增大，发射器后部的压强与单向阀入口处压强逐渐趋于一致，而鱼雷尾部的压强始终小于入口压强。Abstract: In order to directly describe the inner chamber pressure and the distribution of torpedo exit velocity, this paper builds a inner flow field model of torpedo launcher, and performs a numerical simulation based on the dynamic mesh technique of the software Fluent. Simulation result shows that the pressure distribution varies in launcher when torpedo moves in it. At beginning of launch, the pressure gradually gets lower from entrance of launcher due to throttling within the annular gap of torpedo and launcher. But with torpedo moving and the annular gap increasing, the pressure in the back section of launcher bacomes equal to the pressure at the unilateral valve entrance, and the pressure at torpedo tail is always less than the entrance pressure.
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Key words:
- torpedo launcher /
- flow field /
- chamber pressure /
- exit velocity /
- dynamic mesh technique /
- numerical simulation
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