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The model on launching exhaust field of underwater missile was based on viscous non-stationary compressible phase flow theory. In this paper, a reasonable modeling approach of launching exhaust field was obtained by analyzing whether to consider the vaporization effect. The article also analyzed the pros and cons of water injection program. Analysis showed that the launch barrel temperature decreased significantly with injection. On the other hand, poor exhaust problems might arise with injection, so injection quantity must be controlled. This article provides guidance for the scheme of launch. Launch modes of submarine-launched missiles In modern naval warfare, submarine-launched missiles have long range, good hit rate and hidden features. For forty years, the world's naval power attaches great importance to the Submarine missile launch technology. Two launching modes classification based on the position relationship between the launcher and launch platform. One is the use of horizontal torpedo launchers. The other is the use of specialized vertical launcher. Another classification method based on whether to use the carrier. One is the missile launch without carrier. Submarine ballistic missile with the large size., and its most of the trip outside the atmosphere with low aerodynamic characteristics. Therefore, ballistic missile launch without carrier. The other is underwater-launched missiles with carrier. The launch vehicle is equipped with missiles container. Its has a good hydrodynamic performance. Using the Launch program can reduce the missile's design requirements, and can design the missile shape with the aerodynamic requirements. Whether to use the launch vehicle is not essentially different, viewed from the launch dynamics point. There is also a classification based on sources of Launch Power. One is cold launch with the Launch Power coming from launcher. The other is hot launch that with the Launch Power coming from rocket engine. With simple design., low noise, good concealing are significant advantages of cold launch;The disadvantage is that the anti-interference ability is weak, with large dispersion. Hot launch ensure that the missile trajectory is controllable, and ensure water ballistic in good condition. In order to improve the probability of survival of the submarine, the requirements of submarine-launched depth to further increase. Cold launch will lead to the design difficulties of the launcher, and its water ballistic characteristics are difficult to guarantee. In order to minimize the travel of the missile in the water, strengthen the missile motion control, and ensure the missile a good aerodynamic shape, the use of vertical hot launch with launch vehicle is an inevitable choice. Thermal emission has its own characteristics. They are high launched back pressure, gas exhaust is restricted and missiles need to pass through two very different media. How to implement the gas exhaust without structural damage or interfere with missile movement is a main consideration of thermal launched program. As the complexity of the underwater launch, experiment design difficult and expensive. In order to effectively assess and reduce the blindness of the trial, numerical simulation is an inevitable

Simulation on launching exhaust field of underwater missile during vertical hot launching