Impact frequency variation of self-excited oscillation pulsed supercritical carbon dioxide jets

被引：0
|
作者：
Shen H. [1 ,2 ]
Liu Y. [1 ,2 ]
Wei J. [1 ,2 ]
Qiu L. [3 ]
Li H. [1 ,2 ]
Deng Y. [1 ,2 ]
机构：
[1] State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo
[2] State Collaborative Innovation Center of Coal Work Safety and Clean-Efficiency Utilization, Jiaozuo
[3] School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing
来源：
Shiyou Kantan Yu Kaifa/Petroleum Exploration and Development | 2023年 / 50卷 / 05期
关键词：
cavity length; jet impact frequency; resonant coal-breaking; self-excited oscillation plused supercritical CO[!sub]2[!/sub] jet;
D O I：
10.11698/PED.20220756
中图分类号：
学科分类号：
摘要：
In order to obtain the impact frequency of resonant coal breaking by self-excited oscillation pulsed supercritical carbon dioxide (SC-CO2) jet, large eddy simulation was used to analyze the formation and development process of self-excited oscillation pulsed SC-CO2 jet, the variation of jet impact frequency in the nozzle and the free flow field, and the variation of jet impact frequency at different positions in the jet axis and under different cavity lengths. The test device of jet impact frequency was developed, and experiments were performed to verify the conclusions of the numerical simulations. The results show that the frequency of the self-excited oscillation pulsed SC-CO2 jet is different in the nozzle and the free flow field. In the nozzle, the frequency generated by the fluid disturbance is the same, and the jet impact frequency at the exit of the nozzle is consistent with that inside the nozzle. In the free flow field, due to the compressibility of CO2, the pressure, velocity and other parameters of SC-CO2 jets have obvious fluctuation patterns. This feature causes the impact frequency of the self-excited oscillation pulsed SC-CO2 jet to decrease gradually in the axis. Changing the cavity length allows the adjustment of the jet impact frequency in the free flow field by affecting the disturbance frequency of the self-excited oscillation pulsed SC-CO2 jet inside the nozzle. © 2023 Science Press. All rights reserved.
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页码：1097 / 1104
页数：7
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