离心分离型碟式分离机转鼓内部流场数值模拟

针对离心分离型碟式分离机,利用ICEM CFD软件完成转鼓内部流场三维几何模型的建立和六面体网格的划分。选择Fluent软件中的Mixture多相流模型、Realizable k-ε湍流模型和SRF动区域计算模型进行数值模拟。结果表明:离心分离型碟式分离机油水两相分离效果明显,油相出口含油率达99. 96%;油相体积分数分布、压力分布和切向速度沿径向分布符合碟式分离机转鼓内部流场基本理论规律;提升转鼓转速能够显著提高分离机的分离效率,增大水相粒径在一定程度上可以提高分离效率。     

碟式分离机转鼓强度计算软件开发

转鼓是碟式分离机的关键部件之一,其结构强度是用户十分关心的问题。针对碟式分离机转鼓部件的强度问题进行了研究,提出了考虑预紧力和接触情况的应力计算分析方法,所研究的方法基于ANSYS分析软件进行二次开发来实现。最后通过算例验证了方法和程序的正确性。     

碟式分离机自动化仿真分析研究

有限元方法是碟式分离机应力和变形计算的有效方法,但要求较高的专业基础。大部分仿真软件无法实现与CAD的无缝连接,造成了大量的重复劳动,研发人员对仿真自动化的要求越来越高。针对碟式分离机仿真的现状,对碟式分离机的各种工况进行了详细地分析,基于VB的接口技术和ANSYS Workbench平台,开发出了碟式分离机的自动化仿真分析软件AutoSim。详述了自动化仿真分析方案的实施,并通过具体优化实例,验证其方法的可靠性与高效性。     

碟式分离机重液出口影响因素及参数关系图

碟式分离机在分离物料时,通过更换不同的碟片来实现对不同密度物料的分离,这种长期使用的操作方式既复杂又耗时。通过对碟式分离机重液出口环内径计算的影响因素的分析,并从关系图上发现重液出口环等参数的变化规律,找到一个新的方法,来代替更换碟片的繁琐方法,使得碟式分离机的分离过程既简单又经济。     

基于COSMOSWorks的碟式分离机转鼓体强度研究

介绍了碟式分离机的分离原理,并依据离心力场的基本特性,对碟式分离机中最主要的零件转鼓体进行受力分析,通过有限元分析软件COSMOSWorks对转鼓体进行静强度计算,得到转鼓体的应力水平,为转鼓体的结构优化设计提供依据。     

分离机的减振降噪技术研究

通过采用谱分析、声强测量分析、试验模态分析等先进的测试分析技术,对碟式分离机进行系统研究,分析诊断产生振动和噪声的原因并进行有效合理控制,以达到减振降噪的目的,这对降低碟式分离机的噪声会有一定的参考价值。     

碟式分离机及其在脂肪酸分离中的应用

本从碟式分离机分离机理及乳化分离原理入手，介绍了国产碟式分离机在脂肪酸分离中的使用情况，报工艺与设备的关系，阐述了碟式分离机的使用要点。     

碟式分离机碟片冲孔模结构设计及原理

主要阐述碟式分离机碟片冲模设计计算、结构特性以及工作原理。     

国外蝶式分离机机型现状及发展趋势

本文剖析了国外碟式分离机的机型,阐述了分离机的基本机型、转鼓组件、机壳、传动装置及自动控制系统等,并介绍了碟式分离机近来的发展。     

湿法分级超细粉过程初探

机械法超细粉制备中，超细粉的分级是一项关键技术，本文对湿法分级超细粉过程进行了综述，以特陶领域中的重要原料α－Ａｌ２Ｏ５的超细分为对象，借鉴碟式分离机的薄层分离原理，通过模型试验研究了采用碟式分离机分级超细粉的过程，并进行了工业化的初步试验。     

内锥式脱油旋流器流场分析与结构优化

采用流场模拟方法研究了内锥式脱油型水力旋流器的内部流场,其中湍流模型采用多相流中的ReynoIds应力模型,基本方程的离散和求解采用SIMPLEC算法,应用计算流体动力学(CFD)方法对内锥式脱油旋流器进行数值模拟,揭示了特性参数对旋流分离器性能的影响.     

Fluid dynamics and mixing of single-phase flow in a stirred vessel with a grid disc impeller: Experimental and numerical investigations

We report experimental and numerical investigations of a novel grid disc impeller for mixing of single-phase flow in stirred vessels. We performed detailed mean velocity measurements using LDA to understand the flow generated by the grid disc impeller and we also measured the mixing time and power consumption of the grid disc impeller. Measurements showed that the performance of the grid disc impeller, which has radial flow characteristics, is equivalent to a standard propeller in terms of the degree of mixing achieved per unit power consumption. We also performed numerical simulations to predict the flow generated by the grid disc impeller and its mixing performance. It was shown that the present computational model predicts the mean velocities, power consumption and mixing time in good agreement with the measurements. The experimentally validated computational model was further used to understand the effects of impeller rotational speed and grid disc configuration on the fluid dynamics and mixing performance of the grid disc impeller.     

油水旋流分离器研究方法分析

从流动机理模型理论和计算流体动力学(CFD)模拟等方面综述了油水旋流分离器的研究进展状况.应用计算流体力学软FLUENT得到模拟结论,建立模型时运用RSM湍流模型和基于欧拉法的MIXTUER两相流模型.数值模拟得到的结论对油水旋流分离器的设计具有指导意义,为进一步研究油水旋流分离性能提供了参考依据,并且通过对用于油水旋...     

Design Criteria for Oilfield Separators Improved by Computational Fluid Dynamics

Oilfield separator data ranging from light‐oil conditions to heavy‐oil conditions were incorporated into suitable two‐phase and three‐phase computational fluid dynamics (CFD) models to provide improved design criteria for separator design methods. The CFD simulation results revealed that the most important affecting parameters are vapor density and oil viscosity. In contrast with the classic design methods, noticeable residence times were required for liquid droplets to penetrate through the fluid interfaces. Moreover, it was indicated that the Abraham equation should be used instead of the Stokes' law in the liquid‐liquid separation calculations. The velocity constraints caused by re‐entrainment in horizontal separators were also studied and led to novel correlations.     

Unterschiedliche Berechnungsmöglichkeiten von radialen Kreiselpumpen

Various Approaches to Calculations on Radial Centrifugal Pumps Computational fluid dynamics and present day computational hardware have attained a high level of sophistication. This paper reports numerical calculations on centrifugal pumps for steady state and transient conditions. Calculations carried out for one channel of the impeller and for the complete pump are presented. Flow between impeller and pump case was also considered. Very good agreement between simulations and experiments was obtained. The accuracy and the information content of the calculations rise with increasing complexity of the simulation.     

旋流分离器流场模拟研究方法优化选择

对旋流分离器流场计算流体力学研究中的湍流模型、网格划分方案、控制方程离散格式及计算步骤等内容的选择进行了分析. 通过与流场测量数据进行对比,指出雷诺应力模型比RNG k-e模型更能表征分离器切向速度场的组合涡特征;非结构六面体网格划分方案的预测结果更精确;二阶迎风格式的模拟精度并不一定比QUICK格式的模拟精度差,在分离器结构设计及网格划分较复杂的情况下,推荐使用二阶迎风格式;在PISO算法的非稳态计算条件下,收敛残差量级可达10-6以上. 优选的流场模拟研究方法可用于分离器流场分析及指导分离器工程设计.     

Experimental and Computational Analysis on Influence of Water Level on Oil-Water Separator Efficiency

This work applied three-dimensional and volume of fluid (VOF) model of computational fluid dynamic (CFD) simulation to demonstrate the movement of liquid-liquid interface in a primary oil-water separator. Basic sediment and water as well as salt removal had been used as criteria for the separator efficiency, experimentally. Water removal from organic phase was considered as the efficiency using CFD. Simulation was performed for different water levels, and the way this parameter can influence the efficiency was studied. Experimental and CFD simulation results were in relative agreement and showed that the optimum water level is 58 and 50% of separator’s diameter, respectively.     

熵产方法在旋风分离器内部能耗分析中的应用

应用雷诺应力模型对壁面绝热的旋风分离器的流场进行数值分析,对模拟结果采用熵产分析法和(火用)分析法计算分离器的(火用)损,证实了热力学第二定律研究旋风分离器能量损失的可行性。分别计算了旋风分离器内湍流熵产、黏性熵产、壁面熵产和温差传热熵产。结果表明,壁面熵产和湍流熵产占总熵产的比例分别大于56%和38%,是影响旋风分离器能耗的主要因素。分析了旋风分离器内局部熵产,结果表明,芯管附近体积占旋风分离器体积的10%,其熵产占分离器总熵产的比例高于14%,灰斗入口附近体积仅为旋风分离器体积的5.8%,其熵产占总熵产的比例高于16%,因此芯管附近和排尘口附近是旋风分离器能耗的主要区域。     

Model-based analysis of micro-separators for portable direct methanol fuel-cell systems

The applicability of capillary separation to direct methanol fuel-cell systems is studied in this article from two complementary perspectives: a three-dimensional simulation with computational fluid dynamics of a gas–liquid separator, whose function is based on capillary forces rather than gravity, and a zero-dimensional model, which is integrated in the process model of a direct methanol fuel-cell system. The three-dimensional analysis indicates that an appropriate choice of construction and operation parameters allows to achieve almost perfect gas–liquid separation, and that operation is not significantly influenced by orientation. The system-wide analysis indicates that the inclusion of such a capillary separator stabilises the system, allowing the use of simpler control strategies and removing the necessity of sensors difficult to implement.     

旋风分离器分离性能的数值模拟与分析

以XLPB-5.0和XCX-5.0两种旋风分离器为原型,采用CFD软件对这两种旋风分离器进行了流场与分离效率的数值模拟,初步探讨了入口蜗壳形式与芯管结构对分离效率的影响。模拟结果显示:旋风分离器内流场呈各向异性分布特点,切向速度是影响分离效率的首要因素,径向速度的存在会造成"流场短路"现象,使轴向速度呈不对称分布,导致分离效率的降低。轴向速度与径向速度的共同作用促使颗粒在旋风分离器内做螺旋运动;XLPB-5.0和XCX-5.0的分离效率分别为92.55%和94.96%,与实验结果基本吻合,且不同芯管参数下XCX型的分离效率比XLPB型高;螺旋式入口蜗壳(XCX-5.0型)对旋风分离器上部流场的影响相比直流式入口蜗壳(XLPB-5.0型)复杂;对于两种旋风分离器,随着芯管直径的增大,分离效率逐渐变小;随着芯管深度的增大,分离效率先增大后减小。