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A parametric stirring optimization framework was established using computational fluid dynamics (CFD) simulations to systematically investigate the effects and mechanisms of mechanical-pneumatic synergistic stirring on the mixing and mass transfer characteristics of high-solid anaerobic digesters. This framework integrated a power-law model to describe the rheological behavior of the material, a multiphase flow model, and quantitative optimization criteria. Utilizing a typical high-solid concentration (TS=15%) as a specific case, single-phase and multiphase numerical models were developed to quantitatively evaluate the flow field distribution under four types of impellers (double-pitched blade turbine, disk turbine, anchor, and single helical ribbon) and three rotational speeds (20.00, 60.00, and 100.00r/min). The results indicated that the dead zone volume was reduced by 81.49% with the single helical ribbon impeller at 60.00r/min, while the average liquid-phase shear stress (4.42Pa) remained below the microbial floc destruction threshold of 5.00Pa. Furthermore, when inclined gas jet stirring was coupled, a nozzle inclination angle of 30° was found to increase the gas holdup to 24.20%, representing a 4.27-fold improvement over vertical jetting. The nozzle orifice diameter was optimized to 10.00mm to achieve synergistic control over the high-speed liquid-phase region ratio and bubble number density. Ultimately, a bottom-symmetric dual-nozzle-single helical ribbon impeller synergistic stirring system was constructed, which increased the mixing uniformity index by 14.75% and reduced energy consumption by 28.95%. Based on the successful application and flow field analysis of the TS=15% system, quantitative criteria for matching microbial activity maintenance with fluid dynamics optimization were established. This parameterized CFD framework can be extended to evaluate mixing effects in systems with varying solid content by incorporating material-specific rheological parameters, providing a universal optimization method and a theoretical foundation for the design of high-solid anaerobic digestion reactors.

, authors=Shang-bang GUO, Lei LI^*, Wen-jie YE, Lin-pei HAN, Peng XU, Xu-ya PENG, authorsList=Shang-bang GUO, Lei LI, Wen-jie YE, Lin-pei HAN, Peng XU, Xu-ya PENG, authorCompany=null, correspAuthors=Lei LI, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1314918552390431535, articleId=1314918551358632749, tenantId=1146029695717560320, journalId=1234093305789726721, language=CN, title=面向高固厌氧消化的参数化CFD搅拌优化框架建立与应用, columnId=1240689598737731645, journalTitle=中国环境科学, columnName=固体废物, runingTitle=null, highlight=null, articleAbstract=

采用计算流体动力学（CFD）模拟技术，建立了一套参数化搅拌优化框架，系统探究了机械-气动协同搅拌对高固厌氧消化反应器混合传质特性的影响及机制．该框架整合描述物料流变行为的幂律模型、多相流模型及定量优化准则，以典型高固体浓度（TS=15%）为具体应用对象，先后建立单相流及多相流数值模型，定量评估了4种桨型结构（二折叶桨式/圆盘涡轮式/锚式/单螺带式）、3级转速梯度（20.00，60.00, 100.00r/min）下的流场分布特征．结果表明，单螺带桨在60.00r/min工况下可减少81.49%死区体积，且液相平均剪切应力（4.42Pa）低于微生物絮体破坏阈值（5.00Pa）．耦合气体倾斜射流搅拌后，采用30°喷嘴倾角可使气含率提升至24.20%（较垂直喷射提高4.27倍）；将喷嘴孔径优化至10.00mm可实现液相高速区占比与气泡数密度的协同控制．最终构建的底部对称双喷嘴-单螺带桨协同搅拌系统，可使混合均匀度指数提升14.75%、能耗降低28.95%．基于上述针对TS=15%体系的成功应用与流场分析，本研究建立了微生物活性维持与流体力学优化的定量匹配准则．该参数化CFD框架可通过输入特定物料的实测流变参数，推广应用于评估不同含固率体系下的搅拌效果，为高固厌氧消化反应器设计提供了普适性的参数化优化方法和理论依据．

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郭上榜（2001-），女，山西忻州人，重庆大学硕士研究生，主要研究方向为固体废物污染控制与资源化．202317021020@stu.cqu.edu.cn.

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郭上榜（2001-），女，山西忻州人，重庆大学硕士研究生，主要研究方向为固体废物污染控制与资源化．202317021020@stu.cqu.edu.cn.

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