| The launch vehicle is susceptible to the influence of complex marine environment while launching at sea.For example,the six-degree of freedom movement of the platform caused by wind and waves will change the structural strength,initial alignment and position of the launch vehicle accordingly.Moreover,due to the difference between the jet deflector of sea launch and that of land launch,the jet deflector of land launch cannot be directly adopted.For this reason,this paper first analyzes the influence of several typical deflector configurations and geometric parameters on the impact and exhaust performance of gas jet,then analyzes the influence of typical wind wave level on the motion attitude of launch platform,and then analyzes the influence of launch position and launch time on the motion attitude of launch platform and launch vehicle.The main work is as follows:Firstly,according to the general requirements,the three-dimensional model of launch platform is established.The three-dimensional Navier Stokes equations is solved by using the second-order upwind format,realizable k-? turbulence model,component transport model,and the numerical simulation model of gas jet impinging on the jet deflector of launch platform is established.Through the comprehensive analysis of the plume impact flow field and the temperature field of the guide surface and the ejection coefficient,to explore the influence of the jet deflector configuration and the rocket flight height on the gas jet exhaust effect.Through the simulation,it is found that double-direction wedge has the best exhaust effect on the gas jet of the double nozzle launch vehicle.Secondly,the influence of geometric parameters of double-direction wedge on gas jet drainage effect is explored.Through simulation,it can be concluded that when the wedge angle ?=79.4°,the height of the jet deflector H/D=4.94,the drainage effect of the jet deflector is the best,and the length of the jet deflector L/D=6.89 is more appropriate.Finally,based on the three-dimensional potential flow theory,a three-dimensional numerical wave pool model and a six degree of freedom numerical simulation model of launch vehicle and launch platform is established.the influence of longitudinal wave level on the motion attitude of launch platform is explored.The load parameters of gas jet on launch platform are extracted as excitation to explore the influence of launch position and launch direction on the motion attitude of launch platform and rocket under the disturbance of four-stage longitudinal wave on the sea to provide references. |
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