Effect of the air mass flow rate on coal-air two-phase rotating detonation waves

被引：0
|
作者：
Zhu W. [1 ]
Wang J. [2 ]
Wang Y. [1 ]
Li S. [1 ]
Yang F. [1 ]
Xiang B. [1 ]
Zhang G. [3 ]
机构：
[1] College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing
[2] College of Engineering, Peking University, Beijing
[3] School of Aerospace Engineering, Beijing Institute of Technology, Beijing
来源：
Meitan Xuebao/Journal of the China Coal Society | 2022年 / 47卷 / 10期
关键词：
air mass flow rate; gas-solid two-phase detonation; local equivalence ratio; mode transition; rotating detonation engines;
D O I：
10.13225/j.cnki.jccs.2021.1657
中图分类号：
学科分类号：
摘要：
A lot of studies on rotating detonation engines have been carried out due to the theoretically higher thermal efficiency compared with traditional deflagration engines. However, there are few investigations reported on gas-solid two-phase rotating detonation engines which may be used as solid ramjets. In this paper,two-dimensional numerical simulations based on a non-premixed coal-air rotating detonation engine were carried out. The unsteady viscous model with volumetric reaction was used for the gas phase,the discrete phase model was used for the solid phase,and the kinetics / diffusion-limited rate model was used for the surface combustion of coal. The effect of air flow rate on the rotating detonation wave was studied. The working characteristics of the rotating detonation engine under different modes were analyzed and the numerical simulation results were verified by experiments. Results show that the calculated velocity and flow field of the rotating detonation agree well with the experimental results. The layers between air and parｔｉｃｌｅｓ ｃｏｕｌｄ ｎｏｔ ｃｏｍｐｌｅｔｅｌｙ ｃｏｉｎｃｉｄｅ ｗｉｔｈ ｅａｃｈ ｏｔｈｅｒ ｂｅｃａｕｓｅ ｔｈｅ ｐａｒｔｉｃｌｅ ｉｎｊｅｃｔｉｏｎ ｖｅｌｏｃｉｔｙ ｗａｓ ｌｏｗｅｒ ｔｈａｎ ａｉｒ ｉｎｊｅｃｔｉｏｎ ｖｅｌｏｃｉｔｙ，ａｎｄ ｔｈｕｓ ｔｈｅ ｌｏｃａｌ ｅｑｕｉｖａｌｅｎｃｅ ｒａｔｉｏ ｂｅｆｏｒｅ ｔｈｅ ｄｅｔｏｎａｔｉｏｎ ｗａｖｅ ｗａｓ ｈｉｇｈｅｒ ｔｈａｎ ｔｈｅ ｇｌｏｂａｌ ｅｑｕｉｖａｌｅｎｃｅ ｒａｔｉｏ．Ａｓ ｔｈｅ ａｉｒ ｍａｓｓ ｆｌｏｗ ｒａｔｅ ｉｎｃｒｅａｓｅｄ ｆｒｏｍ ３８．１４ ｋｇ／ ｓ ｔｏ １１４．４０ ｋｇ／ ｓ，ｔｈｅ ｖｅｌｏｃｉｔｙ ａｎｄ ｔｅｍｐｅｒａｔｕｒｅ ｐｅａｋ ｏｆ ｔｈｅ ｄｅｔｏｎａｔｉｏｎ ｗａｖｅ ｆｉｒｓｔ ｉｎｃｒｅａｓｅｄ ａｎｄ ｔｈｅｎ ｄｅｃｒｅａｓｅｄ， ａｎｄ ｐｒｅｓｓｕｒｅ ｐｅａｋ ｉｎｃｒｅａｓｅｄ ｇｒａｄｕａｌｌｙ． Ｔｈｅ ｄｅｔｏｎａｔｉｏｎ ｖｅｌｏｃｉｔｙ ｒｅａｃｈｅｄ ｔｈｅ ｍａｘｉｍｕｍ ａｎｄ ｔｈｅ ｍｏｄｅ ｔｒａｎｓｉｔｉｏｎ ｐｒｏｃｅｓｓ ｏｃｃｕｒｒｅｄ ｗｈｅｎ ｔｈｅ ａｉｒ ｍａｓｓ ｆｌｏｗ ｒａｔｅ ｗａｓ ４９．０３ ｋｇ／ ｓ． Ｃｏｍｐａｒｅｄ ｗｉｔｈ ｓｉｎｇｌｅ ｗａｖｅ ｍｏｄｅ，ｔｈｅ ｓｔｒｅｎｇｔｈ ａｎｄ ｓｔａｂｉｌｉｔｙ ｏｆ ｄｏｕｂｌｅ ｗａｖｅ ｍｏｄｅ ｗｅｒｅ ｄｅｃｒｅａｓｅｄ． Ａｃｃｏｒｄｉｎｇ ｔｏ ｔｈｅ ｇａｓ-ｓｏｌｉｄ ｐｈａｓｅ ｄｉｓｔｒｉｂｕｔｉｏｎ ｉｎ ｔｈｅ ｃｏｍｂｕｓｔｉｏｎ ｃｈａｍｂｅｒ，ｔｈｅ ｆｌｏｗ ｆｉｅｌｄ ｄｕｒｉｎｇ ｔｈｅ ｓｔａｂｌｅ ｐｒｏｐａｇａｔｉｏｎ ｏｆ ｒｏｔａｔｉｎｇ ｄｅｔｏｎａｔｉｏｎ ｗａｖｅ ｃａｎ ｂｅ ｄｉｖｉｄｅｄ ｉｎｔｏ ｔｈｒｅｅ ｚｏｎｅｓ：ｆｉｌｌｉｎｇ ｚｏｎｅ，ｄｅｔｏｎａｔｉｏｎ ｐｒｏｄｕｃｔ ｚｏｎｅ ａｎｄ ｄｅｆｌａｇｒａｔｉｏｎ ｐｒｏｄｕｃｔ ｚｏｎｅ © 2022 China Coal Society. All rights reserved.
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页码：3715 / 3728
页数：13
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