Influence Of High-speed Near-Wall Airflow Traversing Aircraft On Effects Of Laser Irradiation

In this paper, fluid-solid thermal coupled computational models have been set up tosimulate the subsonic near-wall airflow traversing a crater in target and heat transfer in targetsolid without phase transition which laser irradiation thermal effect is simulated by DOthermal irradiation model and only the flow field and temperature field of airflow and targetunder projected irradiation effect is simulated in order to predict wall shear, heat flux and heattransfer coefficient on target surface and temperature field in the target under laserirradiation..The prototype of the model is the experiment zone of a flow simulation experimentfacility, and the model is verified by the measured flow field data in it. The Reynoldsaveraged N-S (RANS) equations, the energy equation and the radiative transfer equations ofdiscrete ordinates (DO) radiation model are solved by the method of computational fluiddynamics using commercial software package. The turbulence is modeled with Reynoldsstress transport model. Laser irradiation is simulated with a beam of direct irradiation appliedto the exterior boundary of the computational domain.The models are setup for a series of craters of different fixed sizes in the target andoperating conditions under different atmospheric altitude and flight speed is calculated toinvestigate the influence of depth of the crater. Numerical computation is carried inconditions that simulated atmospheric altitude is respectively0km,3km,5km and simulatedvelocity of air flow is respectively Ma0.3, Ma0.4, Ma0.5, Ma0.6, Ma0.7, Ma0.8. Thecalculations are made for a large number of cases that reproduce conditions of different airdensity and velocity. Transient numerical calculation yields history of the flow field andtemperature field, according to the wall shear and heat transfer coefficient calculated.