Numerical study on ethylene-air continuous rotating detonation in annular combustors with different widths  

作　　者：Wei-jie FAN Wei-dong LIU Hao-yang PENG Shi-jie LIU Jian SUN 

机构地区：[1]Science and Technology on Scramjet Laboratory,College of Aerospace Science and Technology,National University of Defense Technology,Changsha 410073,China [2]State Key Laboratory of Aerospace Dynamic,Satellite Control Center,Xi’an 710043,China

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2022年第5期388-404,共17页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：supported by the National Natural Science Foundation of China(No.51776220);the Postgraduate Scientific Research Innovation Project of Hunan Province,China。

摘　　要：To investigate the impact of combustor width on continuous rotating detonation(CRD)fueled by ethylene and air,a series of 3 D simulations are conducted by changing the inner cylinder radius of an annular combustor while retaining the same outer cylinder radius.The results show that the CRD wave propagates more steadily and faster as the combustor width increases.The high-temperature zone at the backward-facing step preheats the propellants and contributes to the steady propagation of the CRD wave in 25-and 30-mm wide combustors.The highest and the lowest velocities are obtained in the30-and 15-mm wide combustors at,respectively,1880.27 and 1681.01 m/s.On the other hand,the average thrust decreases as the combustor width increases.The highest thrust is obtained in the 15-mm wide combustor while the lowest is in the 30-mm wide combustor,at 758.06 and 525.93 N,respectively.Nevertheless,the thrust is much more stable in the 25-and 30-mm wide combustors than in the 15-and 20-mm wide combustors.

关 键 词：Continuous rotating detonation(CRD) Ethylene-air Combustor width Propagation mode Propulsive performance 

分 类 号：O381[理学—流体力学]