摘要
采用可调谐半导体激光吸收光谱(TDLAS)技术,针对超声速直连台隔离段内超声速气流温度、组分浓度、速度和质量流量进行了测量。选择H2O的两条吸收谱线7 185.597 cm-1和7 454.445 cm-1,采用直接吸收-分时扫描方式,测量流场静温为899 K,并结合吸收面积得到H2O的组分浓度20.7%。根据安装在流场上游和下游成60°的两条光路,测量流场速度为1 205 m/s,结合壁面压力传感器,测量流场的质量流量为1 500.49 g/s,较真实值偏差为5.23%。TDLAS测量系统实现了对超声速气流多参数快速线测量。
Based on the tunable diode laser absorption spectroscopy （TDLAS） technique, temperature, concentration, velocity and mass flux of the supersonic flows were measured in isolator of a direct﹣connected scramjet. Two H2O absorption transitions 7 185.597 cm-1 and 7 454.445 cm-1 were adopted by using direct﹣absorption and Time Division Multiplexing strategy. The measurement results show the static temperature is of 899 K and the H2O concentration is of 20.7% calculating from the absorption area. A cross﹣beam configuration with angles of 60＆#176; along the flows was used to measure the axial velocity. Combined with the pressure sensor on the wall and the measured velocity of 1 205 m/s, the mass flux of the flow is of 1 500.49 g/s with deviation of 5.23%. The TDLAS measured system can be used for in﹣situ measurements of multiple parameters of supersonic flows.
出处
《红外与激光工程》
EI
CSCD
北大核心
2014年第11期3510-3515,共6页
Infrared and Laser Engineering
基金
国家自然科学基金(61403416)
关键词
可调谐半导体激光吸收光谱
超声速气流
温度测量
浓度测量
速度测量
tunable diode laser absorption spectroscopy
supersonic flows
temperature measurement
concentration measurement
velocity measurement
