错列圆柱表面周向压力分布的试验研究

Experimental Study of Pressure Distribution on the Surface

研究了正三角形排列的 3排错列圆柱受到气液两相流横向冲刷时的表面周向时均压力和脉动压力的分布特性 ,讨论了含气率对圆柱表面时均压力系数和脉动压力系数的影响 .气液两相流的流型为细泡状流 ,两相隙缝流雷诺数的范围为 2 0× 10 4 ～ 6 0× 10 4 ,截面含气率的范围为 0～0 30 .试验结果表明 :沿圆柱表面周向的旋涡分离点随着流动向深层发展 ,并向圆柱的背部移动 ;圆柱表面沿周向的时均压力系数几乎不随含气率的变化而变化 ;

Studied are the time-mean pressure distribution and fluctuating pressure distribution along the surfaces of three-row cylinders with diameter 30 mm in staggered arrangement in two-phase cross-flow, and the effects of void fraction on the time-mean pressure and fluctuating pressure. The gas-liquid two-phase fluid gap Reynolds number ranges from 2.0×104 to 6.0×104, and the range of void fraction varies from 0 to 0.3. It is found that the position of vortex shedding is different from three-row cylinders. The time-mean pressure coefficient along the surfaces of the cylinders is not changed with the void fraction. But the fluctuating pressure coefficient reduces with the increase of void fraction.