Mode characteristic extraction of impinging jet based on proper orthogonal decomposition
Based on high-speed imaging experiments in two directions,the spatial and temporal characteristics of the dynamic changes during the impinging jet atomization are studied by means of the proper orthogonal decomposition method.The characteristic changes of the basic flow mode for the impinging jet are elucidated through the analysis of experimental images at different flow velocities.The modal decomposition results of the frontal image sequence are used to analyze the spatial characteristics between the impact wave mode and the mixed mode of impact wave-liquid film breakup.And the single mode energy and the cumulative mode energy of the impact wave mode are higher than the mixing mode.The mode decomposition results of the side view image sequence illustrate the characteristics of impact wave,liquid film breakup and droplet breakup from liquid film.For the impact wave mode,the relative time coefficients of a set of higher-order modes have a trend of reverse change.The wave peaks and troughs in the front image are identified as wave peaks,resulting in the modal characteristic frequency of the front image being twice the side view image.The proper orthogonal decomposition method based on singular value decomposition is applied to test and analyze the image sequence of impinging jet under different cases.By extracting the space wave characteristics and frequency characteristics,it is helpful to optimize the atomization structure design and operation parameters of liquid rocket engine.
impinging jet atomizationproper orthogonal decompositionliquid film breakupimpact wave
万方数据
维普
