燃气射流在变截面充液管道内作用特性研究

Study of Action Characteristics of Gas Jet in Variable Cross-section Liquid-filled Pipeline

为了探究燃气射流在变截面充液管道内与液体工质相互作用对管道稳定性的影响,对燃气射流作用下液体工质的运动特性进行研究。建立燃气射流在变截面充液管道内作用的仿真模型,采用ANSYS FLUENT流体仿真软件对燃气射流作用下的变截面管道内流场变化特性进行数值模拟,获得了液体工质的运动变化特性;根据液体工质运动特性的仿真结果探究了各主要参数对管道稳定性的影响。研究结果表明:在燃气射流作用过程中,燃气与液体工质逐渐混合,形成气液混合相从管道中喷出;在燃气作用初期,液体工质主要作用在管道平直段,粘滞阻力先增大后减小且峰值相对较小;在燃气作用中期,液体工质主要作用在管道收敛段,粘滞阻力峰值逐渐增大;在燃气作用后期,液体工质主要作用在管道扩张段上,粘滞阻力峰值最大。

In order to explore the influence of gas jet on pipeline stability under the action of variable cross-section liquid filling pipe, the motion characteristics of liquid working medium under the action of gas jet were studied. The simulation model of gas jet acting in variable cross-section liquid-filled pipeline was established. The flow field characteristics of variable cross-section pipeline under the action of gas jet were numerically simulated with ANSYS FLUENT fluid simulation software, with the motion characteristics of liquid working medium obtained. The influence of main parameters on the stability of pipeline was explored according to the simulation results of liquid working medium motion characteristics. The results show that during the process of the gas jet,the gas and liquid working medium gradua- lly mix to form the gas-liquid mixing phase ejected from the pipeline. In the initial stage of gas action, liquid working medium mainly acted on the flat-straight section of the pipeline, and the viscous resis-tance first increased and then decreased, and the peak value was relatively small. In the middle stage of the gas action, the liquid working medium mainly acted on the convergence section of the pipeline, and the peak value of viscous resistance gradually increased. At the later stage of gas action, the liquid working medium mainly acted on the expansion section of the pipeline, and the peak value of viscous resistance reached its maximum.