受限空间内射流影响下气固两相流动非定常数值模拟

Unsteady Numerical Investigation of Jet Influence on the Gas-Solid Crossflow in a Confined Domain

就射流对受限空间内气固两相流动的影响进行了三维非定常数值模拟.分析计算结果发现,在射流结构下游尾迹附近区域出现局部回流;在射流结构背风侧存在不对称的连续涡结构发生、脱落与破裂过程,并且涡结构的脱落具有周期性.另外,通过分析射流对不同粒径颗粒尺度的影响,发现射流对10μm量级颗粒能够在流道内形成持续稳定的低浓度区域,计算结果与试验吻合较好.通过分析试验中未测量的位置和参数的计算数据,加强了对该流场内流动特征和颗粒分布的理解,为壁面射流控制手段在流体机械工程上的应用提供参考.

The jet influence on the gas-solid crossflow in a confined domain was investigated by unsteady numerical computation.By analyzing the numerical results,back-flow was found in the jet wake.A series of vortex occurring,spiraling and breaking phenomena were also found in the flow.By supervising some critical points in the flow,the vortex shedding was found to be periodic which is a kind of the Karman vortex street.By tracking the particle path and analyzing the particle concentration field,particles on the 10 μm scale were found forming a clear and persistent low concentration region in the flow field.The simulated results agree well with the experimental.The numerical simulation data untested in the experiment were analyzed to enhance the understanding of the flow characteristic and particle concentration,providing reference to the application of wall jet controlling method in fluid engineering.