Experimental study on transient characteristics of solid rocket motor exhaust plume
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摘要:
以固体火箭发动机系留实验采集图像数据为基础,采用图像均值与方差分析、喷焰典型位置亮度时间序列的快速傅里叶变换(FFT)、改进Hilbert-Huang变换(改进HHT)等方法对其瞬态特性进行分析处理。分析结果表明:在获取的频带内,喷焰整体不存在明显的主脉动频率,各个频率上均存在较小的脉动分量,且核心区的脉动幅值要小于湍流混合区,同时湍流混合区的脉动与核心区的脉动之间存在相关性,基于改进的自适应噪声完备集合经验模态分解算法(ICEEMDAN)的改进HHT变换可作为分析固体火箭发动机喷焰等非平稳信号瞬态特征变化机理的有效手段。
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关键词:
- 固体火箭发动机 /
- 喷焰脉动 /
- 时频特性 /
- ICEEMDAN算法 /
- HHT变换
Abstract:Based on the image data collected by the solid rocket motor mooring experiment, the image mean and variance analysis, the fast Fourier transform (FFT) of the time series of the brightness of the typical position of the flame, and the improved Hilbert-Huang transform (improved HHT) are used to analyze the data. Transient characteristics are analyzed and processed. The analysis results show that: in the obtained frequency band, there is no obvious main pulsation frequency in the entire exhaust plume, and there are small pulsation components at each frequency, and the pulsation amplitude in the core area is smaller than that in the turbulent mixing zone. There is a correlation between the pulsations in the core region and that in the turbulent mixing zone, and the improved HHT transform based on the improved adaptive noise complete set empirical mode decomposition algorithm (ICEEMDAN) can be used as an effective means to analyze the transient characteristic change mechanism of non-stationary signals such as solid rocket engine flames.
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