Bayer Robert, Bača Petr, Maxa Jiří, Šabacká Pavla, Binar Tomáš, Vyroubal Petr
Faculty of Electrical Engineering and Communication, Brno University of Technology, Technická 10, 616 00 Brno, Czech Republic.
Institute of Scientific Instruments of the CAS, Královopolská 147, 612 64 Brno, Czech Republic.
Sensors (Basel). 2024 Sep 14;24(18):5968. doi: 10.3390/s24185968.
This paper deals with CFD analyses of the difference in the nature of the shock waves in supersonic flow under atmospheric pressure and pressure conditions at the boundary of continuum mechanics for electron microscopy. The first part describes the verification of the CFD analyses in combination with the experimental chamber results and the initial analyses using optical methods at low pressures on the boundary of continuum mechanics that were performed. The second part describes the analyses on an underexpanded nozzle performed to analyze the characteristics of normal shock waves in a pressure range from atmospheric pressure to pressures at the boundary of continuum mechanics. The results obtained by CFD modeling are prepared as a basis for the design of the planned experimental sensing of density gradients using optical methods, and for validation, the expected pressure and temperature courses from selected locations suitable for the placement of temperature and pressure sensors are prepared from the CFD analyses.
本文涉及在大气压力以及电子显微镜连续介质力学边界处的压力条件下，对超音速流中激波性质差异的计算流体动力学（CFD）分析。第一部分描述了CFD分析与实验腔室结果相结合的验证过程，以及在连续介质力学边界的低压条件下使用光学方法进行的初始分析。第二部分描述了对欠膨胀喷嘴的分析，以分析从大气压力到连续介质力学边界处压力范围内正激波的特性。通过CFD建模获得的结果为使用光学方法进行计划中的密度梯度实验传感设计奠定了基础，并且为了进行验证，从CFD分析中得出了适合放置温度和压力传感器的选定位置的预期压力和温度变化过程。
