安装角对矿用对旋主通风机叶片气固耦合动力性能的影响.pdf

工程硕士学位论文 安装角对安装角对矿用对旋主通风机矿用对旋主通风机叶片叶片气气固耦合固耦合 动力性能动力性能的影响的影响 Effect of Stagger Angle on Air-solid Interaction Dynamic Perance of Mine Contra-rotating Main Fan Blades 作作 者者 李李 哲哲 导导 师师 陈庆光陈庆光 教授教授 山东科技大学 二〇二〇年六月 万方数据 中图分类号 TH432 学校代码 10424 UDC 密 级 公 开 山东科技大学 工程硕士学位论文 安装角对安装角对矿用对旋主通风机叶片矿用对旋主通风机叶片气气固耦合动力性能固耦合动力性能的影响的影响 Effect of Stagger Angle on Air-solid Interaction Dynamic Perance of Mine Contra-rotating Main Fan Blades 作 者 李 哲 入学时间 2017 年 9 月 导 师 陈 庆 光 职 称 教 授 副 导 师 李 栋 职 称 高级工程师 申请学位 工 程 硕 士 所在学院 机械电子工程学院 学科（类别）工 程 硕 士 方向（领域） 动 力 工 程 答辩日期 2020 年 6 月 提交日期 2020 年 6 月 万方数据 学位论文使用授权声明学位论文使用授权声明 本人完全了解山东科技大学有关保留、使用学位论文的规定，同意本人所撰写的学位 论文的使用授权按照学校的管理规定处理。 作为申请学位的条件之一，学校有权保留学位论文并向国家有关部门或其指定机构 送交论文的电子版和纸质版；有权将学位论文的全部或部分内容编入有关数据库发表， 并可以以电子、网络及其他数字媒体形式公开出版；允许学校档案馆和图书馆保留学位 论文的纸质版和电子版，可以使用影印、缩印或扫描等复制手段保存和汇编学位论文； 为教学和科研目的，学校档案馆和图书馆可以将公开的学位论文作为资料在档案馆、图 书馆等场所或在校园网上供校内师生阅读、浏览。 （保密的学位论文在解密后适用本授权） 作者签名导师签名 日 期 年 月 日日 期 年 月 日 万方数据 学位论文原创性声明学位论文原创性声明 本人呈交给山东科技大学的学位论文，除所列参考文献和世所公认的文献外，全部是 本人攻读学位期间在导师指导下的研究成果。除文中已经标明引用的内容外，本论文不包 含任何其他个人或集体已经发表或撰写过的研究成果。对本文的研究做出贡献的个人和集 体，均已在文中以明确方式标明。本人完全意识到本声明的法律结果由本人承担。 若有不实之处，本人愿意承担相关法律责任。 学位论文作者签名 年 月 日 万方数据 学位论文审查认定书学位论文审查认定书 研究生 在规定的学习年限内，按照培养方案及个人培养计划，完成了课 程学习， 成绩合格， 修满规定学分； 在我的指导下完成本学位论文，论文中的观点、 数据、 表述和结构为我所认同，论文撰写格式符合学校的相关规定，同意将本论文作为申请学位 论文。 导师签名 日 期 万方数据 摘摘 要要 对旋轴流风机作为一种通用设备，具有结构紧凑、易于拆卸和维护等优点，被广泛应 用于煤矿和隧道工程、石油和化工生产等领域。对于矿用对旋式主通风机来说，改变两级 动叶片的安装角是调节其性能参数以满足不同工况要求的主要方式之一，因此两级动叶安 装角的调节和匹配非常重要，否则极易在气固耦合作用下出现低效运行的情况，甚至影响 通风设备运行的安全性。因此研究在气固耦合作用下动叶安装角对通风机动力性能的影响 具有重要意义。 本文以 FBCDZ-10-No20 型压入式矿用对旋主通风机为研究对象，在两级动叶不同的 安装角条件下，对风机内流特性进行数值模拟，并基于气固耦合计算对两级叶轮进行静力 特性和动力特性分析，揭示了动叶安装角对对旋风机内流特征和叶片气固耦合动力性能的 影响。 首先，对两级动叶安装角分别为 β-3、0和3时的对旋风机全流道内的三维流场进 行数值模拟， 获得风机的基本内部流动特性， 并对风机沿轴向和径向的流动进行特性分析。 研究结果表明， 随着动叶安装角度的增大， 两级叶轮对气体的做功能力增强、 轴功率增加， 后级叶轮增加的幅度大于前级；当动叶安装角增大时，叶片压力面的静压和吸力面的压力 梯度都明显增大，后级叶轮的变化幅度大于前级叶轮；当两级动叶安装角均为3时，叶片 上的静压分布呈现更显著的周向不均匀性。 然后，结合单向气固耦合分析方法，对对旋风机的两级叶轮进行了静态特性分析，分 析结果表明，当动叶安装角增大时，两级叶轮所受等效应力和总变形量均增大；当考虑气 固耦合和离心力载荷协同作用时，两级叶轮所受等效应力和总变形量的最大值均增加，两 级叶轮的静力特性受离心力的影响最大；当叶片安装角 β3时等效应力值最大，但仍远 不及叶片材料的许用应力， 表明两级动叶安装角为-3、 0和3时都不会对叶轮结构造成损 坏。 最后，对对旋风机两级动叶片进行了动态特性分析，分析结果表明，在气固耦合作用 下，叶片安装角对叶轮叶片的动力特性影响很小，不同安装角所对应的固有频率和振型分 布大致相似；离心力和气动力对叶片动力特性有一定影响，但增加幅度很小，主要以离心 力载荷影响为主；三种安装角时的叶片最大总变形均呈现于叶顶区域，零变形区均在叶根 与轮毂表面连接处；三种动叶安装角时的叶片共振裕度远超安全裕度范畴，叶片不会引起 共振危险。 本文从风机的内流特性和两级叶轮叶片动力性能的角度探讨了动叶安装角的改变对 矿用对旋主通风机的影响，同时考虑了气流与叶片之间的气固耦合作用，研究成果对于提 高矿用对旋主通风机运行的安全性和稳定性具有重要参考价值。 关键词关键词矿用对旋主通风机；动叶片；安装角；气固耦合；动力性能 万方数据 Abstract As a kind of general equipment, contra-rotating axial fan is widely used in coal mine and tunnel engineering, petroleum and chemical production due to its compact structure, easy disassembly and maintenance and other advantages. For the main rotary fan of mine, changing the stagger angle of the two-stage moving blade is one of the main ways to adjust its perance parameters to meet the requirements of different working conditions. Therefore, the adjustment and matching of the stagger angle of the two-stage moving blade is very important. Otherwise, it is easy to have inefficient operation under the Air-structure interaction, and even affect the safety of ventilation equipment. Therefore, it is of great significance to study the influence of the moving blade stagger angle on the dynamic perance of wind turbines under the effect of Air-structure interaction. In this paper, the FBCDZ-10-No20 mine contra-rotating main fan with press-in operation is used as the research object, and the numerical simulation of the internal flow field of the fan is pered under different two-stage moving blade stagger angles. The static and dynamic characteristics of the two-stage impellers were analyzed, and the influence of moving blade stagger angle on the internal flow characteristics and the Air-solid interaction dynamic perance of the blade was revealed. First, the 3D flow field in the full flow channel of the contra-rotating fan is simulated when the two-stage moving blade stagger angles are β -3, 0 and 3, to obtain the basic internal flow of the flow field inside the fan, and the characteristic analysis was carried out on the axial and radial flows of the fan. The results prove that with the increase of the stagger angle, the working force of the two-stage impeller on the gas is enhanced, and the shaft power is increased. The increase of the rear-stage impeller is larger than that of the front-stage. When the blade stagger angle increases, the static pressure on the blade pressure surface and the pressure gradient on the suction surface increase significantly, and the rangeability of the rear-stage impeller is larger than that of the front-stage. The static pressure distribution on the blade exhibits more significant circumferential non-uniity when the two-stage moving blade stagger angles are all 3. Then, based on the unidirectional Air-solid interaction analysis , the static characteristics of the impeller-type contra-rotating fan two-stage impeller are analyzed. The analysis results show that when the moving blade stagger angle increases, the equivalent stress and total deation of the two-stage impeller increase. When considering the combined effect of Air-solid interaction and centrifugal load, the maximum value of the equivalent stress and the total deation of the impeller increase, and the centrifugal load has the greatest effect on the static characteristics of the impeller. The equivalent stress value is maximum when the blade stagger angle β3, but it is still far less than the allowable stress of the blade material, and it will 万方数据 not cause damage to the impeller structure when the stagger angles of the two-stage moving blades are -3, 0 and 3. Finally, the dynamic characteristics analysis of the two-stage moving blades of the contra- rotating fan are pered. The analysis results show that the blade stagger angle has little effect on the dynamic characteristics of the impeller blades under Air-solid interaction, and the natural frequencies and mode shapes corresponding to the different stagger angle are approximately similar. Centrifugal force and aerodynamic force have a certain effect on the dynamic characteristics of the blade, but the increase is small. The main effect is mainly based on the centrifugal load. The maximum total deation of the blades at three stagger angle appears in the blade tip area, and the zero-deation zone is at the junction of blade root and hub surface. The resonance margin of the three stagger angle blade is much larger than the safety margin range, so there is no danger of resonance. In this paper, the influence of the moving blade stagger angle on the mine contra-rotating main fan is studied from the perspective of the internal flow field of the fan and the dynamic perance of the two-stage impeller blades, and the Air-solid interaction between air flow and blades is considered. The research results have important reference value for improving the safety and stability of mine contra-rotating main fan. Keywords Mine contra-rotating main fan; Moving blade; Stagger angle; Air-solid interaction; Dynamic perance 万方数据 目目 录录 图清单..Ⅰ 表清单..Ⅲ 变量注释表..Ⅳ 1 绪 论 ......................................................................................................................................... 1 1.1 研究背景及意义 ............................................................................................................ 1 1.2 国内外研究现状与进展 ................................................................................................ 2 1.3 本文研究内容 ................................................................................................................ 6 2 对旋风机内部湍流与结构动力学数值模拟基本理论 ........................................................... 8 2.1 控制方程 ........................................................................................................................................ 8 2.2 湍流数值模拟方法 ...................................................................................................... 10 2.3 结构动力学理论 .......................................................................................................... 12 2.4 本章小结 ...................................................................................................................... 15 3 不同叶片安装角对应工况下对旋风机的内流特性 ............................................................. 16 3.1 几何模型建立及网格划分 .......................................................................................... 16 3.2 边界条件及湍流模型 .................................................................................................. 19 3.3 叶片安装角对风机内部流场的影响 .......................................................................... 21 3.4 叶片安装角对风机出口气流的影响 .......................................................................... 26 3.5 本章小结 ...................................................................................................................... 28 4 基于气固耦合的对旋风机叶轮静力特性分析 ..................................................................... 29 4.1 气固耦合分析基本步骤 .............................................................................................. 29 4.2 两级叶轮有限元计算模型 .......................................................................................... 30 4.3 叶片安装角对两级叶轮强度的影响 .......................................................................... 31 4.4 叶片安装角对两级叶轮刚度的影响 .......................................................................... 35 4.5 本章小结 ...................................................................................................................... 40 5 基于气固耦合的对旋风机叶片动力特性分析 ..................................................................... 41 5.1 模态分析基本步骤 ...................................................................................................... 41 5.2 安装角对两级动叶模态分析的影响 .......................................................................... 42 5.3 安装角对两级动叶振动特性的影响 .......................................................................... 47 5.4 本章小结 ...................................................................................................................... 48 万方数据 6 结论与展望 ............................................................................................................................. 49 6.1 结论 .............................................................................................................................. 49 6.2 展望 .............................................................................................................................. 50 参考文献 作者简历 致谢 学位论文数据集 万方数据 Contents List of FiguresⅠ List of TablesⅢ List of Variables..Ⅳ 1 Introduction ............................................................................................................................. 1 1.1 Background and Significance of the Research ............................................................... 1 1.2 Research Status and Progress At home and Abroad ...................................................... 2 1.3 Research Contents .......................................................................................................... 6 2 Basic Theory for Numerical Simulation on Turbulence and Structural Dynamics of Contra-rotating Fan ...................................................................................................................... 8 2.1 Governing Equations ...................................................................................................... 8 2.2 Numerical Simulation of Turbulence ............................................................. 10 2.3 Theory of Structural Dynamics .................................................................................... 12 2.4 Summary ...................................................................................................................... 15 3 Inner Flow Characteristics of Contra-rotating Fan Under Different Blade Stagger Angles ....................................................................................................................................................... 16 3.1 Geometric Modeling and Mesh Generation ................................................................. 16 3.2 Boundary Conditions and Turbulence Model .............................................................. 19 3.3 Effect of Stagger Angle of Fan Blade on Internal Flow Field ..................................... 21 3.4 Effect of Stagger Angle of Fan Blade on Airflow at Exit ............................................ 26 3.5 Summary ...................................................................................................................... 28 4 Static Characteristics Analysis of Contra-rotating Fan Impellers Based on Air-solid Interaction ..................................................................................................................... 29 4.1 Basic Procedures of Air-solid Interaction Analysis ..................................................... 29 4.2 Finite Element Calculation Model of Two-stage Impellers ......................................... 30 4.3 Effect of Stagger Angle of Fan Blade on the Strength of Two-stage Impellers .......... 31 4.4 Effect of Stagger Angle of Fan Blades on the Stiffness of Two-stage Impellers ........ 35 4.5 Summary ...................................................................................................................... 40 5 Dynamic Characteristics Analysis of Contra-rotating Fan Blades Based on Air-solid Interaction ..................................................................................................................... 41 万方数据 5.1 Basic Procedures of Modal Analysis ........................................................................... 41 5.2 Effect of Stagger Angle on Modal Analysis of Two-stage Moving Blades ................. 42 5.3 Effect of Stagger Angle on Vibration Characteristics of Two-stage Moving Blades .. 47 5.4 Summary ...................................................................................................................... 48 6 Conclusions and Prospects ................................................................................................... 49 6.1 Conclusions ..........................................................................................................