【作者】 王晟； 张振荣； 瞿谱波； 邵珺； 叶景峰；

【Author】 WANG Sheng;ZHANG Zhen-rong;QU Pu-bo;SHAO Jun;YE Jing-feng;State Key Laboratory of Laser Interaction with Matter,Northwest Institute of Nuclear Technology;

【机构】 西北核技术研究所激光与物质相互作用国家重点实验室；

【摘要】 为了在极端燃烧条件下高精度测量发动机的流场速度,提出了采用固体石英法布里-珀罗标准具检测流场固有分子瑞利散射光的多普勒频移来获得流场速度。介绍了多点干涉瑞利散射测速技术的基本原理,分析了散射光接收方向与测量速度分量方向的关系。建立了正交两速度分量同时测量的多点测速系统。获得了流场干涉周期图像,采用图像相关检测法精确确定了干涉环的圆心位置;基于阻尼最小二乘法拟合光谱曲线得到了散射光干涉斑的多普勒频移,并计算了相应的速度。获得了在喷管出口1.5~7mm处马赫数为1.5时,自由射流在x-y平面内正交的两个速度分量,并给出了x-y平面内多点速度矢量图。结果表明,该测速系统能够实现流场正交两速度分量的同时测量。更多还原

【Abstract】 To obtain the flow field velocity of an engine with high dependability at extreme combustion condition,the velocity of gas flow field was measured by using Fabry-Perot etalon to detect the Doppler frequency shift of molecular scattering.The working principle of a multi-point interferometric Rayleigh scattering velocimeter was introduced,and the correlation between collecting direction of scattering light and the direction of measured velocity component was analyzed.Then,an orthogonal two-component multi-point velocity measurement system was set up.Based on the measured interference fringe image,the center of interference fringe was measured by template match,the Doppler frequency shift of Rayleigh scattering was obtained through a fitting spectrum curve by with LevenbergMarquarat algorithm and the corres ponding velocity was calculated.The orthogonal two-components with a Mach air flow of 1.5were obtained at an x-yplane,and the multi-point velocity vector graph in the x-y plane was given.The research results show that this velocity measurement system can simultaneously measure the orthogonal two-component velocities with high dependability.更多还原