The spouting of vertical submerged axisymmetric jets from under the free surface in relatively narrow channels is experimentally and numerically studied. The existence of self-oscillation regimes with transverse displacements of the free-surface elevation is found for wide ranges of constitutive parameters. Dependencies of the self-oscillation period on the velocities of jets and the initial value of the jet submergence are analyzed for various jet diameters. Some spouting regimes are numerically analyzed. A new class of self-oscillation spouting regimes known also as quasiregular is discovered for high-speed small-diameter jets when the depth of their submergence is relatively small. A comparison is made with the results obtained for plane submerged jets.

中文翻译：

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垂直淹没的轴对称射流在较窄通道中的喷出

实验和数值研究了在相对狭窄的通道中从自由表面下方喷出的垂直淹没轴对称射流。对于宽范围的本构参数，发现了具有自由表面高程横向位移的自激振动机制的存在。对于各种直径的喷嘴，分析了自激振荡周期对喷嘴速度和喷嘴浸没初始值的依赖性。数值分析了一些喷射方式。当高速小直径射流的浸没深度较小时，发现了一种新型的自振荡喷流形式，也称为准规则射流。与飞机浸没式射流获得的结果进行了比较。