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基于CFD的LNG空温式汽化器管内气液两相流数值模拟

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中国化工装备 2024年第2期26卷 23-27页

作者：朱小林刘磊南通中集能源装备有限公司

介绍了LNG汽化器的分类及空温式汽化器的应用现状，指出我司及行业内汽化器产品开发所遇到的瓶颈：缺乏汽化器及翅片管结构开发的理论工具，只能依靠试验的方式来验证结构开发的合理性。由此，本文基于计算流体力学（CFD）仿真软件ansys... 详细信息

介绍了LNG汽化器的分类及空温式汽化器的应用现状，指出我司及行业内汽化器产品开发所遇到的瓶颈：缺乏汽化器及翅片管结构开发的理论工具，只能依靠试验的方式来验证结构开发的合理性。由此，本文基于计算流体力学（CFD）仿真软件ansys fluent，对LNG空温式汽化器的管内传热流动过程进行模拟计算，开发了一种代替实际试验来验证结构开发合理性的数值模拟方法。为翅片管的结构开发提供理论依据，为空温式汽化器的整体结构设计提供技术指导。

关键词：空温式汽化器数值模拟 ansys fluent 结构开发

基于ansys fluent的吹膜旋转牵引气垫辊出风均匀性研究

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橡塑技术与装备 2023年第11期49卷 52-55页

作者：黄一帆许丰广东金明精机股份有限公司广东汕头515098

随着吹膜生产线中旋转牵引部件的广泛应用,气垫辊部件在旋转牵引中扮演着至关重要的角色。出风均匀性作为气垫辊设计合理性的重要指标,对于薄膜的物理性能和生产效率具有重要影响。本文通过使用ansys fluent这一流体力学数值模拟软件,... 详细信息

随着吹膜生产线中旋转牵引部件的广泛应用,气垫辊部件在旋转牵引中扮演着至关重要的角色。出风均匀性作为气垫辊设计合理性的重要指标,对于薄膜的物理性能和生产效率具有重要影响。本文通过使用ansys fluent这一流体力学数值模拟软件,研究了吹膜旋转牵引气垫辊内部的流动行为,并探讨了不同设计参数对出风均匀性的影响。通过数值模拟结果的分析和对比,可以为气垫辊的设计和优化提供理论指导,以提高吹膜工艺的质量和效率。

关键词：吹膜旋转牵引气垫辊数值模拟 ansys fluent

CFD analysis for mixing performance of different types of household biodigesters

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Clean Energy 2022年第2期6卷 325-334页

作者： Sagar Shrestha Sunil Prasad Lohani Renewable and Sustainable Energy Laboratory Department of Mechanical EngineeringKathmandu UniversityNepal

Household biodigesters are self-mixing anaerobic digesters used mostly in rural areas of developing countries as a reliable source of clean cooking energy.For an efficient anaerobic digestion process,the mixing of slurry inside the digester is regarded as one of the most important parameters.In this study,the mixing of slurry in three different designs of household digesters,namely the fixed-dome digester(GGC 2047 model),plug-flow digester and prefabricated plastic digester,are investigated and compared using compu-tational fluid dynamics.A 3D transient simulation is performed using a multiphase volume of fluid(VOF)model in ansys^(■)fluent release 16.0.The rheological properties of the feedstock are considered identical for all three digesters.The volume of the plug-flow and prefabricated plastic digesters is designed to be 1 m^(3) while the volume of the GGC 2047 digester was 6 m^(3) as the standard size of the household digester.The regions inside the digester where the velocity of slurry is<0.02 m/s are regarded as dead zones and the obtained results were analysed and compared using velocity patterns and dead-zone formation.It is found that the prefabricated plastic digester model has a relatively higher percentage of dead volume(74.6%)and the plug-flow digester has the lowest per-centage(54%)of dead volume among digesters that were compared in this study.The study will serve as the basis for designers and researchers to improve the design of household digesters for better mixing performances.

关键词： household biodigesters dead zone CFD anaerobic digestion mixing biomass ansys fluent

Nacelle intake flow separation reduction at cruise condition using active flow control

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Propulsion and Power Research 2022年第3期11卷 337-352页

作者： Vinayak Ramachandran Nambiar Vassilios Pachidis Centre for Propulsion Engineering Cranfield UniversityBedfordMK430ALUK

Turbofan engine intakes are designed to provide separation-free flow at the fan faceover a wide range of operating conditions. But at some off-design conditions, like at high flightspeeds and high angles of attack (AoA), the aero engine intake may encounter flow separation.This boundary layer separation inside the nacelle inlet of an aircraft engine can lead to a largenumber of undesirable outcomes like reduction in fan efficiency, engine stall and high levels ofstress on the fan blades. Active flow control is a promising solution to reduce inlet boundarylayer separation and the associated fan-face flow distortion at such off-design conditions. Byblowing pressurized air into the intake near the separation point, the boundary layer is ener-gized and separation can be controlled. This study investigates the applicability of lip blowing,an active flow control technique, to control intake separation and flow distortion at the fan-face.First, intake separation was triggered in a 3D CFD model based on the NASA CommonResearch Model (CRM) using high AoA cases at cruise condition (Mach number 0.85, Massflow capture ratio w0.7) and the features of separated flow were analyzed. Thereafter, activeflow control was introduce to the intake in the form of two types of lip blowing, direct andpitched blowing. The efficacy of lip blowing at achieving separation control in an ultra highbypass ratio turbofan engine intake has been established through this study. The present paperalso examines the significance of blowing parameters like the type of blowing, blowing pres-sure ratio, and blowing slot dimension, at different angles of attack to identify the critical con-trol parameters. Our research successfully establishes proof of concept by demonstrating the feasibility of using lip blowing for separation control in aero-intakes, via numerical modelling.Furthermore, this study also provides crucial insights regarding the important variables to beconsidered for future experimental studies, and also for detailed studies covering a wider

关键词： Ultra high bypass ratio turbofan engine NASA Common Research Model Reynolds-averaged Navier-Stokes(RANS) Computational fluid dynamics(CFD) ansys fluent Intake flow separation Active flow control Lip blowing

The effect of noise barriers on viaducts on pollutant dispersion in complex street canyons

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Energy and Built Environment

Energy and Built Environment 2023年第5期4卷 589-600页

作者： Tingzhen Ming Fangyan He Yongjia Wu Tianhao Shi Changrong Su Caixia Wang Zhengtong Li Wei Chen Renaud de Richter School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan 430070China Department of Aeronautical and Aviation Engineering The Hong Kong Polytechnic UniversityHong KongChina Tour-Solaire.Fr 8 Impasse des PapillonsMontpellier F34090France

The noise reduction effect of noise barriers has been extensively studied,but the effect on pollutant dispersion remains unclear.A computational fluid dynamics(CFD)simulation is conducted to investigate the effects of different heights,lengths,and types of noise barriers and different wind speeds on pollutant dispersion in street canyons with viaducts.The field synergy theory of the convective mass transfer process is used for quantitative analysis of pollutant dispersion in street canyons.The results show that as the height and length of the noise barrier increase,the pollutant dispersion capacity decreases.As the wind speed increases,the rate of decrease in the average CO concentration declines.The effect of the wind speed on the synergistic improvement of the speed and concentration gradient vectors differs for different types of noise barriers.The performance follows the order:fully-closed noise barrier>left noise barrier>right noise barrier>semi-closed noise barrier.The different noise barrier types significantly impact the flow field and pollutant dispersion and reduce the CO concentration to varying degrees,except for the fully-closed type.The average CO concentration in the pedestrian breathing zone is reduced by a maximum of 55.85%on the leeward side and by 53%on the windward side,indicating that an appropriate noise barrier on the viaduct reduces noise pollution and improves the air quality in street canyons,especially in the pedestrian breathing zone.

关键词： ansys fluent Carbon monoxide Computational fluid dynamics(CFD) Near-road environment Traffic related air pollutants(TRAP)

Sediment transport simulation and design optimization of a novel marsh shoreline protection technology using computational fluid dynamics (CFD) modeling

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International Journal of Sediment Research 2022年第1期37卷 14-25页

作者： Salman Saki Grant Besse Peng Yin Daniel Gang Donald Hayes Department of Civil Engineering University of Louisiana at Lafayette University of Texas at San Antonio U.S.Army Engineer Research and Development Center (ERDC)

Coastal Louisiana has the nation’s most fragile and valuable wetlands,whose loss represents 80% of the total losses in the United States.The severely restricted mobility of conventional shoreline protection structures makes them impossible to be redeployed.The Wave Suppression and Sediment Collection(WSSC) system is a novel technology of high mobility and compatible with existing shoreline protection technologies.Previous laboratory studies on WSSC showed great potential for wave reduction and sediment collection.The current study aimed to optimize the design parameters of WSSC using a validated computational model.A computational fluid dynamics (CFD) model was developed and validated using experimental data from the previous laboratory study.Then,a parametric analysis was conducted with a focus on the performance optimization of wave reduction and sediment collection with respect to pipe diameter and face slope.Simulation results showed that the wave reduction efficiency decreased with increasing pipe diameter and face slope.In contrast,the sediment transport efficiency was enhanced by increasing pipe diameter but was not affected significantly by varying face slopes.

关键词： Breakwaters Computational fluid dynamics Sediment transport Shoreline protection Coastal engineering ansys fluent

基于ansys fluent的某重力坝动力水压模拟研究

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陕西水利 2023年第3期 24-25,29页

作者：刘明湖北省汉江河道管理局杜家台分洪闸管理分局湖北仙桃433000

在重力坝稳定性评估中,一个特别具有挑战性的方面是:当水体以很大的速度越过重力坝并流进或流过泄洪道部件时,对诱发的流体动力水压的仿真模拟、动力水压的仿真及模拟对区域内的坝体安全具有重要意义。根据某地大坝的现状数据搭建三维模... 详细信息

在重力坝稳定性评估中,一个特别具有挑战性的方面是:当水体以很大的速度越过重力坝并流进或流过泄洪道部件时,对诱发的流体动力水压的仿真模拟、动力水压的仿真及模拟对区域内的坝体安全具有重要意义。根据某地大坝的现状数据搭建三维模型,运用ansys-fluent对重力坝坝体安全及坝体溢流后水体变化进行仿真模拟研究。结果表明:1)在研究区域内,坝体泄流后水体会在模拟剖面上产生负压,并改变溢洪道段水体积分数;2)本研究的坝体桥墩之间和板下方的流动速度显著增加,并局部产生负压;3)根据模拟结论,坝后水体仅在板下和桥墩下游区域进行充分曝气。研究结果为重力坝溢流控制及坝体安全强度设计提供基础的理论指导,并对坝体溢流系统的设计提供一定的参考。

关键词：重力坝模拟 ansys fluent

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非能动安全壳空气冷却系统换热能力分析

哈尔滨工程大学学报 2023年第7期44卷 1162-1168页

作者：冯雨王洪亮马屹松李云屹郭强于明锐刘卓韩旭元一单中国核电工程有限公司中核核电安全严重事故研究重点实验室北京100840

为分析环境温度和安全壳外表面发射率对小型压水堆非能动安全壳空气冷却系统换热能力的影响,本文采用ansys fluent软件建立了非能动安全壳空气冷却系统的计算模型,分析了非能动安全壳空气冷却系统在事故后的稳态换热能力。结果表明:非... 详细信息

为分析环境温度和安全壳外表面发射率对小型压水堆非能动安全壳空气冷却系统换热能力的影响,本文采用ansys fluent软件建立了非能动安全壳空气冷却系统的计算模型,分析了非能动安全壳空气冷却系统在事故后的稳态换热能力。结果表明:非能动安全壳空气冷却系统换热能力随环境温度的升高而降低,环境温度对非能动安全壳空气冷却系统换热能力影响较明显;非能动安全壳空气冷却系统换热能力随安全壳外表面发射率的升高而升高,安全壳外表面发射率对非能动安全壳空气冷却系统换热能力影响较小。以上结果可以为非能动安全壳空气冷却系统在不同环境温度及安全壳外表面发射率发生变化后的换热能力提供基础数据,也可以为今后小型压水堆在环境温度较低的高纬度地区建设提供参考。

关键词：环境温度发射率小型压水堆非能动安全壳空气冷却换热能力 ansys fluent 计算模型

A simulation study of a windowless gas-stripping room in an E//B neutral particle analyzer

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Nuclear Science and Techniques 2021年第7期32卷 22-30页

作者： Yuan Luo Wei-Ping Lin Pei-Pei Ren Guo-Feng Qu Jing-Jun Zhu Xing-Quan Liu Xiao-Bing Luo Zhu An Roy Wada Lin-Ge Zang Yu-Fan Qu Zhong-Bing Shi Key Laboratory of Radiation Physics and Technology of the Ministry of Education Institute of Nuclear Science and TechnologySichuan UniversityChengdu 610064China Cyclotron Institute Texas A&M UniversityCollege StationTX 77843USA School of Physics Henan Normal UniversityXinxiang 453007China Southwestern Institute of Physics Chengdu 610064China

The neutral particle analyzer(NPA)is one of the crucial diagnostic devices in a Tokamak facility.The stripping unit is one of the main parts of the NPA.A windowless gas-stripping room with two differential pipes has been constructed in a parallel electric and magnetic fields(E//B)NPA.The pressure distributions in the stripping chamber are simulated by ansys fluent together with MolFlow+.Based on the pressure distributions obtained from the simulation,the stripping efficiency of the E//B NPA is studied using GEANT4.Hadron reaction physics is modified to track the charge state of each particle in a cross-section-based method in GEANT4.The transmission rates(R)and stripping efficiencies f_(+1)are examined for particle energies ranging from 20 to 200 keV with the input pressure(P_(0)),ranging from 20 to 400 Pa.According to the combined global efficiency,R×f_(+1),P_(0)=240 Pa is obtained as the optimum pressure for the maximum global efficiency in the incident energy range investigated.

关键词： Neutral particle analyzer Windowless gas-stripping chamber Stripping efficiency ansys fluent MolFlow+ GEANT4