气液固三相管流耦合水击振动特性的参数影响分析

以气液固三相管流为研究对象,采用矢通量分裂法并结合Lax-Wendroff格式和迎风Warming-Beam格式,对浆液池-管道-阀门系统的耦合水击振动响应进行了数值计算,分析了含气率、固液密度比以及固液弹模比等参数对系统振动特性的影响。结果表明:增加含气率可有效地降低压力和应力波速,同时削弱流体压力波动和管道振动强度;当固液密度比增大时,管系振动强度随之增大,系统振动能量的增量主要集中在流体里,造成流体压能升高较快;随着固液弹模比的增加,管系压能和振动强度均增加,但增幅很小;当固液弹模比增加到某种程度后,其对系统压能和振动强度的影响可忽略。

ANALYSIS OF PARAMETRIC INFLUENCE OF A COUPLED WATER HAMMER ON THE VIBRATION CHARACTERISTICS OF GAS-LIQUID-SOLID THREE-PHASE FLOW IN PIPELINES

With gas-liquid-solid three-phase flow as a research subject, the vibration responses induced by a coupled water hammer in a slurry reservoir-pipeline-valve system are obtained by combining the flux vector splitting method with a Lax-Wendroff scheme and an upwind Warming-Beam scheme. The influences of void fraction, density ratio, and elastic modulus ratio between the solid phase and liquid phase on vibration characteristics of the system are analyzed. The numerical results show that the velocities of pressure waves and stress waves decrease with the increase of void fraction, and the intensity of pressure fluctuation and pipe vibration fall simultaneously. As the density ratio between solid phase and liquid phase increases, the vibration of pipeline system becomes stronger, and additional vibration energy of the pipeline system mostly concentrates in the fluid, thus the pressure energy in the fluid rises rapidly. With increased elastic modulus ratio between solid phase and liquid phase, both pressure energy and vibration intensity in the pipeline system increase slightly. When the elastic modulus ratio between solid phase and liquid phase increases past a certain extent, its influence on the pressure energy and vibration intensity of the pipeline system can be neglected.