摘要
为探索气液两相脉冲爆轰发动机爆轰噪声形成机理及控制方法,对雾化汽油近场爆轰噪声进行测量分析,建立理论模型并利用时空守恒元/求解元方法(CE/SE)进行数值仿真。结果表明:爆轰噪声主要由冲击噪声和射流噪声组成;冲击噪声在爆轰噪声中占主导作用,并引起爆轰噪声峰值;爆轰噪声峰值与径向距离三次方成反比;在0°、30°、45°和90°方向拟合得到的衰减系数分别为4.3×10-2、3.4×10-2、2.8×10-2和7.0×10-3;脉冲爆轰发动机近场爆轰噪声峰值指向性明显;随着角度的增大,爆轰噪声峰值逐渐降低;随着轴向距离的增加,射流噪声逐渐减小;当轴向距离小于900 mm时,射流噪声衰减速度小于冲击噪声衰减速度,当轴向距离大于1 200 mm时,射流噪声衰减速度大于冲击噪声衰减速度。
To study the formation mechanism and control method of detonation noise for gas-liquid two-phase pulse detonation engines, atomizing gasoline detonation noise in near-field is measured and analyzed. A theory model is set up and the space-time conservation element and solution element method (CE/SE)is utilized in near-field numerical simulation of pulse detonation engine detonation noise. The results show that:detonation noise is mainly composed of impulsive noise and jet noise; impulsive noise plays a dominant role in detonation noise and causes detonation peak noise; detonation peak noise is proportional to - 3 power of the radial distance in near-field ; the fitted attenuation coefficients are 4.3×10^-2, 3.4 ×10^-2, 2.8 ×10^-2and 7.0 ×10^-3 at the 0°, 30°, 45 ° and 90° directions;obvious directivity of pulse detonation engine detonation peak noise occurs in nearfield ; pulse detonation engine detonation peak noise amplitude decrease gradually with the increase of
出处
《南京理工大学学报》
EI
CAS
CSCD
北大核心
2014年第6期781-786,共6页
Journal of Nanjing University of Science and Technology
基金
国家自然科学基金(11002074)
高等学校博士学科点专项科研基金(20113219120045)
中央高校基本科研业务费专项资金(30920130112007)
关键词
爆炸力学
脉冲爆轰发动机
雾化汽油
噪声辐射
指向性
爆轰噪声
冲击噪声
射流噪声
衰减系数
轴向距离
explosion mechanics
pulse detonation engines
atomizing gasoline
noise radiation
directivity
detonation noise
impulsive noise
jet noise
attenuation coefficients
axial distance
作者简介
许桂阳(1990-),男,博士生,主要研究方向:脉冲爆轰发动机降噪,E—mail:xuguiyang90@163.com;
通讯作者:翁春生(1964-),男,教授,博士生导师,主要研究方向:脉冲爆轰发动机,E-mail:wengcs@126.com。