Real‐Time Plume Velocity Measurement of Solid Propellant Rocket Motors Using TDLAS Technique,Propellants, Explosives, Pyrotechnics

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Real‐Time Plume Velocity Measurement of Solid Propellant Rocket Motors Using TDLAS Technique
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2021-03-02 , DOI: 10.1002/prep.202000091
Anchen Song ₁ , Zhao Qin ₂ , Junwei Li ₁ , Meng Li ₂ , Ke Huang ₃ , Yanjing Yang ₂ , Ningfei Wang ₁

Affiliation

Accurate measurement of plume velocity plays an important role in investigation of rocket motors, and the plume velocity is an indicator of energy level of solid propellants. A method based on laser Doppler effect using tunable diode laser absorption spectroscopy (TDLAS) is employed in this study. The absorption spectrum of water vapor feature at 1391.7 nm is utilized to measure the plume velocity. Three solid propellants, double‐base (DB), composite modified double‐base (CMDB), and nitrate ester plasticized polyether (NEPE) i. e., are burned in a motor with an internal diameter of 50 mm and their plume velocities are measured with scanned‐WMS‐2f technique. Afterburning reactions in the plume are numerically simulated. The simulations can provide insight into the nuances in measured TDLAS results and give confidence in the result. The results show that TDLAS is a good method to measure plume velocity. The relative standard deviation of the measurements is less than 4 %. The difference between the measured velocity and the simulated one is less than 8.25 %. Additionally, it is found that NEPE has the largest plume velocity, and the velocity of DB is the lowest. Uncertainties of velocity measurement using TDLAS are analyzed. Measurement uncertainty comes from velocity non‐uniformity in the direction perpendicular to the plume direction. Furthermore, it can be found that it is better to put the measurement position close to the nozzle exit to reduce measurement errors.

中文翻译：

使用TDLAS技术实时测量固体推进剂火箭发动机的羽流速度

羽流速度的准确测量在火箭发动机的研究中起着重要作用，羽流速度是固体推进剂能级的指标。本研究采用了一种基于激光多普勒效应的可调谐二极管激光吸收光谱法（TDLAS）。利用水汽特征在1391.7 nm处的吸收光谱来测量羽流速度。三种固体推进剂：双碱（DB），复合改性双碱（CMDB）和硝酸酯增塑聚醚（NEPE）i。例如，在内径为50 mm的电动机中燃烧，并使用scand-WMS-2f技术测量其羽流速度。对羽状流中的后燃反应进行了数值模拟。仿真可以提供对所测量的TDLAS结果中的细微差别的洞察力，并给结果带来信心。结果表明，TDLAS是测量羽流速度的良好方法。测量的相对标准偏差小于4％。测量的速度与模拟的速度之间的差异小于8.25％。另外，发现NEPE具有最大的羽流速度，而DB的速度最低。分析了使用TDLAS进行速度测量的不确定性。测量不确定性来自垂直于羽流方向的速度不均匀性。此外，可以发现最好将测量位置靠近喷嘴出口以减少测量误差。另外，发现NEPE具有最大的羽流速度，而DB的速度最低。分析了使用TDLAS进行速度测量的不确定性。测量不确定性来自垂直于羽流方向的速度不均匀性。此外，可以发现最好将测量位置靠近喷嘴出口以减少测量误差。另外，发现NEPE具有最大的羽流速度，而DB的速度最低。分析了使用TDLAS进行速度测量的不确定性。测量不确定性来自垂直于羽流方向的速度不均匀性。此外，可以发现最好将测量位置靠近喷嘴出口以减少测量误差。

更新日期：2021-03-31

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