中文摘要：

通过对水平管气液两相钝体绕流中的泡状流和段塞流进行实验研究，从重复性、斯特劳哈尔数（St）随体积含气率的变化和不同体积含气率的斯特劳哈尔数相关性三个方面对涡街稳定性进行分析，得出体积含气率在15％以内能形成稳定涡街，大于15％时，稳定涡街受到破坏，但仍有漩涡脱落的结论。实验结果表明：三种方法所得结果具有一致性，且稳定可靠。

英文摘要：

Experimental researches are carried out on bubble flow and slug flow of flow around bluff body in horizontal gas-liquid two-phase flow. Stability of vortex street is analyzed based on repeatability, variation trend of St and correlation research of St with changing volume void fraction. It is concluded that the flow field can produce a stable vortex street when volume void fraction is within 15 % but the stable vortex street is destroyed and it can still produce vortex street when volume void fraction is greater than 15 %. Experimental studies show that the results of three methods are consistent and have good stability.