A Missile Concentric Canister Launch Noise Analysis And Control Method

When the missile engine starts,there will be strong gas noise after jet, this is the major sources of pollution in the process of using engine, and it is very bad for the normal operation of the equipment in the rockets, the health of the testing and using peoples and the internal and external environment. The work of reduce the rocket noise is significant.This paper analyses the characteristics of a rocket launch noise source, and analyses the absorption characteristics of the porous absorption material, and points out that the rocket launch noise mainly is quadrupole turbulence noise. When using porous absorption deal with the noise reduction, there are certain difficulty, but if select material appropriate, there will be certain absorbing effect of the noise reduction. And then have done the numerically simulation for the concentric canister launcher using the computational fluid dynamics software, and draw the map of speed and pressure of the rockets in the concentric canister launcher. And then transform the pressure value to the result of sound sources, then doing the numerical simulation of sound pressure level of particular point of concentric canister launcher, using the Computational Aeroacoustics software. From the simulation results can be seen noise field is in a certain direction, mainly in the direction of the gas jet. Finally, in concentric canister launch at the bottom of the device and the inner loading porous absorption material, with acoustic simulation software numerical simulation the noise field characteristics. And the results were compared with exist data, and concludes that the absorption material in it there is certain absorption and noise function, for the improvement of the concentric canister launch device provide theoretical support.