湍流多相混合与气化反应耦合机理、过程强化及火焰结构特征研究

Study on the Turbulent Multiphase Mixing Coupling With the Gasification Reaction Mechanism, Process Intensification and Structural Characteristics of the Flame

经过该年度的实施,已完成了研究任务,上述预期目标均已实现,主要完成情况如下:(1)调试、升级了PIV测试平台,配置了平面激光诱导荧光(PLIF)系统,新购置了Photron Fastcam SA2高分辨率高速相机。(2)研究了激励作用下轴对称撞击流和平面撞击流的流场形态及撞击面振荡规律,获得了激励频率、振幅和喷嘴出口湍流强度对撞击面振荡的影响规律,研究结果为湍流撞击流的混合机理和强化手段研究提供了参考。(3)利用光场相机与高温内窥镜相结合,结合数字图像处理技术,对不同工况下的柴油撞击火焰高度及脉动频率进行研究,建立了多喷嘴对置式气化炉内火焰三维温度场,获得了气化火焰撞击高度,为大型气化炉的安全稳定运行提供了理论指导。(4)运用优化的PTV算法,获得了复杂对置撞击射流中颗粒运动行为的定量测量。利用国家超算中心平台,实现了气固两相对撞流的大规模直接数值模拟。基于热力学第二定律分析了撞击流的不同流态。(5)采用附加边界应力的格子Boltzmann方法(LB-EBF),进一步研究了不同颗粒数目、颗粒流体密度比及颗粒容积率下的惯性颗粒群沉降的运动规律,发展了两类三维不可压缩多松弛格子Boltzmann模型,并实现了单相撞击流以及运动颗粒两相流动格子Boltzmann模拟的GPU并行化。

On the basis of the work of the third year, the subject undertaker - the researcher of the East China University of Science and Technology, and Huazhong University of technology centre on the goals around the issue, and give full play to their respective advantages, and work closely to carry out more in-depth research work, and had staged progress and laid a solid foundation for the final completion of the research tasks. In this year, 19 papers were published, of which 11 were indexed by SCI, 18 were indexed by EI, and six patent were applied, and one patent was granted. A second prize of Science and Technology Progress Award of Petrochemical Association and a first prize of the Shanghai Science and Technology Progress Award were obtained. The turbulent multiphase flow system were in-depth studied experimentally, theoretically and numerically, and a breakthrough was achieved in theory revealing the flow stability of turbulent impinging jets, and a number of innovative academic achievement were achieved, and the results have important reference value to the multi-nozzle gasifier design and optimization.