《表1 具有不同速度比的亚声速同轴射流基本流计算参数列表》

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《亚声速同轴射流波包敏感性研究(英文)》

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coaxial jets considered.In general，three stages of jet development can be identified，referred to as the initial merging zone，intermediate zone and fully merged zone，marked in Fig.1，which are qualitatively similar to previous work[13].As illustrated in Fig.1（a），the initial merging zone starts from the nozzle exit and ends near the end of outer potential core at about z=4D where the two shear layers begin to merge.The intermediate zone，where most of jet mixing takes place，starts from the end of outer potential core and extends to the point where the outer shear layer reaches the jet axis at about z=13D.The fully merged zone is located just downstream of the intermediate zone，where the flow field becomes similar to the single-stream jet.We also find that both the inner and outer potential core lengths become shorter when the velocity ratio decreases，in consistence with the results of Gloor et al.[15].