火星上的气固流态化模拟实验

Experiment of simulation study on gas-solid fluidization on Martian environments

为了了解火星上的气固流态化行为,本文应用计算颗粒流体力学方法对不同重力条件下的气固流化床反应器中的流态化现象进行了数值模拟研究。分析了火星环境条件下气固流化床内的流体速度分布特性,探索了床层压力波动特性与环境重力和表观气速等因素间的关系。结果表明,在火星环境条件下,提高表观气速可以促进气固流态化的形成和充分发展;但是较高的表观气速会使流化床内的气固流场紊乱程度增加,不利于维持稳定的气固流态化状态。研究结果对于未来在火星上开展物质和能源等就地生产用气固流态化单元操作具有一定的指导意义。

In order to understand the gas-solid fluidization behavior on Mars,the computational particle fluid dynamics(CPFD)method was applied to analyze the fluidization phenomenon in the gas-solid fluidization bed reactor under different gravity conditions.The fluid velocity distribution characteristics in the gas-solid fluidized bed were studied,and the relationship between the pressure fluctuation of the bed and the environmental gravity and superficial fluidized gas velocity was obtained.The results showed that under the Martian environment,increasing superficial gas velocity could promote the formation of well-developed gas-solid fluidization,but the higher superficial gas velocity would increase the degree of disorder of the gas-solid flow field in the bed,which had a certain negative impact on the stable operating of the fluidized bed.The research results had certain guiding significance for future gas-solid fluidization operations used for on-site production of materials and energy on Mars.