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Effects of isolator length on pseudoshock wave in a rectangular duct
Ruoyu Deng,Ke Xin Wu,Heuy Dong Kim,Qijun Chen 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.1
The scramjet isolator length is a very important influence factor on the stability of scramjet engines. The effects of the isolator length on the pseudo-shock wave (PSW) were studied through a numerical method. The steady and unsteady PSW characteristics were analyzed to explore the influence mechanism of the isolator length. The numerical model was validated with the existing experimental results, and the validation results show that the numerical model has high accuracy. The effects of the structural variation of the PSW on self-excited oscillation were explored at different isolator lengths. Result shows that increasing the isolator length increases the length of the PSW. The leading shock becomes stable with the increasing of PSW length, and the following shocks become unstable. This phenomenon indicates that the unsteady characteristics of self-excited oscillation are closely related to the PSW structure. The influence mechanism of isolator length is represented by the amplitude difference of the leading and following shocks caused by the PSW structure variation.
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Lei Qi,Ruibin Guo,Zunli Mo,Qijun Wu 한국탄소학회 2018 Carbon Letters Vol.25 No.-
Large-size graphene samples are successfully prepared by combining ultrosonic assisted liquid phase exfoliation process with oxidation-deoxidation method. Different from previous works, we used an ultrasound-treated expanded graphite as the raw material and prepared the graphene via a facile oxidation-reduction reaction. Results of X-ray diffraction and Raman spectroscopy confirm the crystal structure of the as-prepared graphene. Scanning electron microscopy images show that this kind of graphene has a large size (with a diameter over 100 μm), larger than the graphene from graphite powder and flake graphite prepared through single oxidation-deoxidation method. Transmission electron microscopy results also reveal the thin layers of the prepared graphene (number of layers ≤3). Furthermore, the importance of preprocessing the raw materials is also proven. Therefore, this method is an attractive way for preparing graphene with large size.
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