海底天然气水合物绞吸式开采切削头绞吸特性

中文摘要: 摘要：根据切削头的结构和工作原理，建立了切削头绞吸流场模型，运用fluent仿真软件和计算流体力学理论研究了切削头工作过程中的绞吸流场特性，分析了绞吸流场的绞吸规律、速度变化规律和出口固相体积分数变化规律。对影响绞吸能力的主要工作参数（绞吸流量和绞刀转速）进行了详细的仿真分析，得到了各个参数和绞吸能力之间的关系。结果表明：增大绞吸流量有利于提高绞吸能力，当绞吸流量超过2000m3/h时，继续增大绞吸流量并不能有效提高绞吸能力，还会导致管道内固相速度过高，加剧固相颗粒和管道之间的磨损；当绞刀转速低于20r/min时，增大绞刀转速有利于提高绞吸能力；当绞刀转速大于20r/min时，增大绞刀转速将显著降低绞吸能力。
Abstract:Abstract:The flow filed model of cutter-suction was established according to the structure and working principle of cutting head.The characteristic of flow filed was researched by utilizing Computational fluid dynamics theory and Fluent simulation software.The law of flow field and velocity field and The change law of solid volume fraction of outlet was analysed. The main working parameters(speed of cutter and velocity of sucker mouth) which effected cutter-suction capacity was simulated in detail. The relationship between the parameters and the cutter-suction capacity was obtained. Increasing the cutter-suction flow is beneficial to the improvement of the cutter-suction capacity,when the cutter-suction flow over 2000m3/h,continue to increase the cutter-suction flow leads to high velocity of solid phase in the pipeline,and increase wear between solid particles and pipes;When the speed of cutter below 20r/min,increasing the speed of cutter is beneficial to the improvement of the cutter-suction capacity; When the speed of cutter over 20r/min, continue to increase speed of cutter will reduce the cutter-suction capacity significantly.