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基于可调谐半导体激光吸收光谱(TDLAS)技术,利用吸收光谱中1392nm附近的H2O吸收谱线,测量了双基推进剂和改性双基推进剂装药在Ф50mm标准缩比发动机中燃烧后产生的排气羽流的流速。结果表明,双基推进剂装药的流速在达到第1个峰值后有稍许下降,随后缓慢上升,进入位于0.90~1.39s的平台区;而改性双基推进剂装药的流速在达到1100m/s后直接进入位于0.33~0.88s的平台区,而流速在该区域内呈现下降趋势;上述两种装药的排气羽流流速曲线的变化趋势与燃烧室内压强曲线一致,但由于流速测量点距喷口有一定距离,导致其与压强曲线相比有一定程度的滞后;双基和改性双基两种推进剂装药在距发动机喷口30cm处的平均羽流流速分别为831.8和1057.5m/s。
Based on tunable semiconductor laser absorption spectroscopy (TDLAS), the absorbance spectra of 1392nm in the absorption spectrum were used to measure the effect of the charge of double base propellant and modified double base propellant on the Ф50mm standard reduction engine after combustion Exhaust plume flow rate. The results show that the flow rate of the double-base propellant decreases slightly after reaching the first peak, and then rises slowly and enters the platform zone located between 0.90 and 1.39s. The flow rate of the modified double-base propellant charge reaches 1100m / s directly into the platform area located at 0.33 ~ 0.88s, and the flow rate in this area showed a downward trend; the trend of the above two charge exhaust plume flow curve and the pressure curve of the combustion chamber, but the flow rate measurement Point distance from the nozzle, resulting in a certain degree of lag compared with the pressure curve; the average plume flow rate of the double-base and modified double-base propellant charging 30cm away from the engine nozzle were 831.8 and 1057.5m / s.