Numerical Study On The Interaction Between Jets And Rudders In Supersonic Flows

Supersonic spacecraft aeronautics is one of the headlines in the research field of aeronautics and astronautics for countries all over the world.It is widely used in tactical/strategic missile design and high speed manned/unmanned aircraft design due to its high penetration performance and rapid transport performance for long distances.At such a high speed,the attitude and orbit control is always the key problem of aircraft control.The transverse jet control which also be named as reaction Control System(RCS)is a preferred control solution because of its simple structure and rapid response.The combination of transverse jet control with aerodynamics control surface control have great potential to obtain an even better control performance which is highly considered by researchers in recent years.First of all,the research achievements of scholars at home or overseas in the jet interaction research field are collected and summarized.The state-of-the-art studies for the computational technology and application of jet interaction in the supersonic oncoming free stream are introduced to prove the technicality,inventiveness and high application value of the studies in this thesis for the interaction between jets and rudders in supersonic main stream.Secondly,the numerical methods and aerodynamic configuration model are briefly introduced.The grid-independence and numerical verification are accomplished and the derivation of global multi-jet force and moment amplification factors and rudder force and moment amplification factors for single-jet and multi-jet are carried out based on the global force and moment amplification factor,which is a widely used characteristic in jet interaction.The multi-jet interaction effect is defined to give a better and more convenient explanation for the numerical results.Then,air-to-air missiles with and without are modeled to be the aerodynamic configurations based on the missile layout,free stream characteristics and jet flow parameters.Finally,a large number of numerical simulations are carried out for three variables,which are the jet flow characteristics,with or without rudder and the jet location for single-jet cases and jet number for multi-jet cases by verified numerical methods.According to the numerical results,the jet design recommendations are as follows:1.J2 nozzle is the best jet location for single-jet configuration with rudders.2.The strongest attitude and orbit controls are obtained when 7 jets work together for the configuration without rudders.3.The strongest attitude and orbit controls are obtained when 5 and 7 jets work respectively for the first set of jet flow characteristics and 6 and 7 jets work respectively for the second set of jet flow characteristics.The greatest jet amplification for attitude and orbit controls obtained when 2 and 1 jets work respectively for the first set of jet flow characteristics and 4 and 2 jets work respectively for the second set of jet flow characteristics.At the end,further studies of the jet interaction are expected.