Simulation of turbulent combustion in DLR Scramjet

Turbulent combustion in a DLR (German Aerospace Center) Scramjet engine was simulated using the newly-proposed Partially Resolved Numerical Simulation (PRNS) procedure. The PRNS procedure uses temporal filtering to define large-scale turbulence, and the model developed to account for unresolved scales is grid independent. No problem about inner commutation error and inconsistencies will arise from the PRNS, while such issues are of concern in traditional Large Eddy Simulation (LES) methods. The mean results have good agreement with the experiment data and the flow structures with small scales are well resolved.

极速狂魔

自从100年前，第一架飞机摇摇晃晃地离开地面，工程师们就梦想着制造出越来越快的飞机。但很久以来，世界的极速没有改变过。在过去的40年中，美国的侦察机SR-71是公认速度最快的飞行器，最快可达到3马赫——换句话说，3倍于声速，或者每小时3000公里。