气液两相流横掠错列圆柱形成旋涡脱落诱发管束振动的试验研究

Experimental Investigation of Tube Bundle Vibrations Induced by a Vortex Shedding Generated by Gas-liquid Two-phase Flows Sweeping Across Staggered Tube Arrays

对相同直径的 3排错列圆柱表面的旋涡脱落工况进行了试验研究。测试圆柱采用Φ30mm的有机玻璃圆柱。试验时两相隙缝流Re数范围为 2 .0× 10 4～ 6 .0× 10 4,含气率的范围在 0～ 0 .3之间。通过试验分析获得了不同排列形式的错列管束中两相流斯特拉赫数 ;试验发现两相流斯特拉赫数Sttp随含气率的增加而减小 ;提出了旋转正三角形排列的错列管束的斯特拉赫数曲线 ;

The vortex shedding condition of three rows of staggered circular cylinder with the same diameter was experimentally investigated. The cylinders being tested were made of acrylic glass cylinders with a diameter of 30 mm. During the tests the two-phase gap-flow Reynolds number ranges from 2.0×104-6.0×104 and the range of void fraction from 0-0.3. By way of experimental analyses, the Strouhal number of two-phase flows was determined in staggered tube bundles with different layout modes. The test results indicate that the Strouhal number of the two-phase flows decreases with an increase in the void fraction. The characteristic curves of Strouhal numbers are presented for the staggered tube bundles with a rotating regular-triangle layout. It is noted that Weaver curves of single-phase flows can be approximately used as discrimination criteria for the tube bundle vibrations induced by the vortex shedding in rotating-square arranged and regular-triangle arranged tube bundles in two-phase flows.