摘要
对大功率调制气流声源的内流场开展了初步的实验研究,包括设计二维声源实验模型,基于单点静压和粒子图像测速(PIV)技术获取喷口下游喉道内的稳态流场数据。实验测得速度场分布和静压值变化趋势均与理论分析结果保持一致,表明采用的实验方案能够确定声源稳态流场特性。喉道内部以负压为主,同一截面上静压值基本相近,外壁面流动分离和近壁面高低压区域交替成为典型工况下声源内流场的重要特征。
The internal flow measurements of Air-modulated Speaker were carried out.Following the model s mechanical detail,steady flow test results of 2D AMS model were obtained utilizing particle image velocimetry（PIV） and single point static pressure measurement.The theoretical analysis showed good approximation to the experimental results in velocity and static pressure distribution,which indicated that the experimental setup was reliable to study steady flow characteristics.Test data showed that static pressure in most area of internal flow was lower than the standard atmosphere pressure, and similar pressure data were acquired at the same vocal tract section. Dominant flow characters were emphasized including flow separation in out wall and alternate appearance of low and high pressure area on the internal wall.
出处
《工程与试验》
2009年第3期56-60,共5页
Engineering and Test
关键词
调制气流声源
PIV
流动分离
air-modulated speaker
particle image velocimetry
flow separation
