壅塞现象法测量气粉两相流音速  

Choking Phenomenon Used as an Approach to Measure Sonic Velocity of AirPowder Two-Phase Flow

作　　者：李强[1] 冯明霞[1] 邹宗树[1] 沈峰满[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2007年第10期1417-1420,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(50474014)

摘　　要：实验研究了在水平等截面管道中空气-树脂粉两相流的音速．基于壅塞现象原理，提出了一种测量气粉两相流音速的新方法．得到了空气-树脂粉两相流在不同固气比下质量流量和滞止压强的关系，从而确定了发生壅塞现象的临界压强，进一步得到了临界压强比和固气比的关系式．考虑两相流连续方程确定出两相流的实际表观音速，并且与两相平衡流理论计算所得的理论音速进行了比较，仅为其0．5～0．7倍．Experiments were carried out to investigate the sonic velocity of air-powder two-phase flow in a horizontal constant cross section duct. Based on the forming principle of choking phenomenon, an approach is proposed to measure the sonic velocity of air-powder two-phase flow. The relationship between the mass flow rates of such an air-powder two-phase flow and inlet stagnant pressure is obtained with different solid-to-air ratios, thus determining the pressure under which the choking phenomenon takes place and, further, giving the relationship of the ratio of back pressure to critical pressure and the solid-to-air ratio. Taking the continuity equation of air-powder flow into consideration, the apparent sonic velocity of two-phase flow can be given. Furthermore, the apparent sonic velocity is compared with theoretical sonic velocity calculated on the theory of two-phase equilibrium flow.

关 键 词：气粉两相流 音速 壅塞现象 测量 

分 类 号：TQ021.2[化学工程]