Research at LMFA for Turbomachinery: a Focus on Compressors (流体力学与声学实验室LMFA的透平机械及压气机研究进展)
讲座名称：
Research at LMFA for Turbomachinery: a Focus on Compressors (流体力学与声学实验室LMFA的透平机械及压气机研究进展)
讲座时间：
2019-05-17
讲座人：
Xavier Ottavy
形式：
校区：
兴庆校区
实践学分：
讲座内容：
讲座题目：Research at LMFA for Turbomachinery: a Focus on Compressors (流体力学与声学实验室LMFA的透平机械及压气机研究进展)
讲座时间：2019年5月17日（周五）15:00-17:00
讲座地点：北二楼二楼学术报告厅
讲座人：Xavier Ottavy
报告摘要: Turbomachinery is not a new subject in research, but the efforts provided to go ahead in this thematic have always been important. Today it is even more the case due to the fact that Turbomachinery needs to understand and integrate a lot of fundamental mechanisms in fields such as Fluid Mechanics, Turbulence, Thermodynamics, Acoustics, Mechanics, and their couplings. In order to design a compressor, not only its performance but also its operating range have to be predicted. This indeed has to be achieved within a level of confidence which becomes narrower with the complexity of the new machines. The tools to design a compressor are nowadays mainly based on Computational Fluid Dynamics. It starts with analytical modelling, continues with meridian and RANS simulations and sometimes uses Large Eddy Simulations in order to focus on specific features of the flow (even if these kind of simulations are still carried out in laboratories). Close to the end of the process experiments are always needed. First for an obvious need of validation of the design process, and of the prediction tools used, second to highlight and take into account and/or explain the coupling effects that the simulations cannot tackle.
Following this logic the goal of this presentation is to show how the LMFA participates in the research activities associated to compressors. The first part will be dedicated to the presentation of the Lab and the research topics on which the LMFA is focusing. The second part will present the experimental facilities and the numerical tools with their own specificities. The third part will address the topics of unsteadiness and instabilities. Here one of the major points concerns the characterisation of the basic structures (such as the tip leakage flow or the corner separation) that develop in a compressor blade channel and become deterministically unsteady when they change frame in rotors and stators. Some "fundamental" examples using Large Eddy Simulations and advanced experiments will be introduced. Some more realistic test cases installed on the LMFA's test rigs will demonstrate the importance of the coupling in the onset of instabilities. The last part will presents some elements about how to design test rigs and will try to summarize these research activities and their trends for the future.
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