In this paper, high-speed cameras and flow visualization techniques are used to investigate the behavior of the ‘fountain filling box’ flow resulted from releasing a round fountain in a homogeneous quiescent fluid in a cylindrical container over the ranges of $1.0⩽\mathit{Fr}⩽20.0,102⩽\mathit{Re}⩽1502$, and $27.9⩽\lambda ⩽48.75$, where $\mathit{Fr},\mathit{Re}$ and $\lambda$ are the Froude number, the Reynolds number, and the dimensionless radius of the container, respectively, with $\lambda$ non-dimensionalized by the fountain source radius. The results show the transition of the flow behavior of the fountain and its secondary flows (i.e., the intrusion, reversed flow and stratification) from laminar to turbulent with increasing Fr, and turbulence of the flow strengthened with increasing Re. For intermediate (e.g., $\mathit{Fr}=3.0$) and forced turbulent fountains (e.g., $\mathit{Fr}=5.0$, 8.0, 15.0) with a specific $\lambda$, the non-dimensionalized time-scale for the intrusion front to impinge upon the sidewall, ${\tau }_w$, is nearly constant for $\mathit{Re}\gtrsim 500$. This is because the secondary intrusion flow is dominated by the wall-jet and buoyancy-inertial regimes where the non-dimensionalized intrusion front velocity, $v_i$, is only time-dependent ($v_i~{\tau }^{-1/2}$) or time-dependent but also under the influence of Fr ($v_i~{\mathit{Fr}}^{-1/2}{\tau }^{-1/4}$). However, ${\tau }_w$ for the fountains of $\mathit{Re}\lesssim 204$ is significantly different, which may result from the change in the dominant regime for the intrusion or the interaction between the upflow, downflow of the fountain and the ambient fluids. Furthermore, it is found that the non-dimensionalized quasi-steady development rate of the stratification, $v_s$, increases with Fr, but decreases with Re, since the diffusion effect is suppressed with decreasing Fr or increasing Re.

在本文中，使用高速摄像头和流量可视化技术来研究“喷泉填充箱”流动的行为，该流动是由于在圆柱形容器内的均质静态流体中释放圆形喷泉而产生的，该圆形喷泉在以下范围内 $1.0⩽\mathit{r}⩽20.0，102⩽\mathit{回覆}⩽1502$， 和 $27.9⩽\lambda ⩽48.75$， 在哪里 $\mathit{r}，\mathit{回覆}$ 和 $\lambda$ 分别是Froude数，雷诺数和容器的无量纲半径，分别为 $\lambda$未根据喷泉源半径进行尺寸标注。结果表明，随着Fr的增加，喷泉及其次要流动（即侵入，逆流和分层）的流动行为从层流向湍流过渡，而随着Re的增加流的湍流增强。对于中级（例如，$\mathit{r}=3.0$）和强迫湍流的喷泉（例如，$\mathit{r}=5.0$，8.0、15.0）与特定 $\lambda$，即入侵前沿撞击到侧壁的无量纲时间尺度， ${\tau }_w$，对于 $\mathit{回覆}\gtrsim 500$。这是因为次要侵入流主要由壁面射流和浮惯性机制所主导，在这些情况下，未量纲的侵入前沿速度，$v_{\mathrm{一世}}$，仅与时间相关（$v_{\mathrm{一世}}〜{\tau }^{--\mathrm{1个}/2}$）或时间相关，但也受Fr（$v_{\mathrm{一世}}〜{\mathit{r}}^{--\mathrm{1个}/2}{\tau }^{--\mathrm{1个}/4}$）。然而，${\tau }_w$ 为的喷泉 $\mathit{回覆}\lesssim 204$两者之间的差异很大，这可能是由于入侵的主导机制发生了变化，或者源于喷泉的上，下流与周围流体之间的相互作用。此外，发现分层的无量纲拟稳态发展速度，$v_s$，增加了与星期五，但与减少再，由于扩散效应随抑制星期五或增加重新。