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Studies on Performance of Distributed Vertical Axis Wind Turbine under Building Turbulence

Energy Engineering 2023年第3期120卷 729-742页

作者： Xin Sun Chi Zhang Yan Jia Shikang Sui Chong Zuo Xueqiang Liu School of Energy and Power Engineering Inner Mongolia University of TechnologyHohhot010051China Key Laboratory of Wind Energy and Solar Energy Utilization Technology Ministry of EducationInner Mongolia University of TechnologyHohhot010051China Gree Electric Appliances.Inc.of Zhuhai Zhuhai519000China

As a part of the new energy development trend,distributed power generation may fully utilize a variety of decentralized energy sources.Buildings close to the installation location,besides,may have a considerable impact on the wind turbines’operation.Using a combined vertical axis wind turbine with an S-shaped lift outer blade and-shaped drag inner blade,this paper investigates how a novel type of upstream wall interacts with the incident wind at various speeds,the influence region of the turbulent vortex,and performance variation.The results demonstrate that the building’s turbulence affects the wind’s horizontal and vertical direction,as well as its speed,in downstreamplaces.The wall’s effect on wind speed changing in the downstreamarea is thoroughly investigated.It turns out that while choosing an installation location,disturbing flow areas or low disturbing flow zones should be avoided to have the least impact on wind turbine performance.

关键词： Vertical axis wind turbine building turbulence CFD sliding mesh installation position

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NUMERICAL INVESTIGATION OF CAVITATION PERFORMANCE OF SHIP PROPELLERS

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Journal of Hydrodynamics 2012年第3期24卷 347-353页

作者： ZHU Zhi-feng FANG Shi-liang Key Laboratory of Underwater Acoustic Signal Processing Ministry of Education Southeast University Nanjing 210096 China School of Electrical Engineering and Information Anhui University of Technology Maanshan 243002 China Key Laboratory of Underwater Acoustic Signal Processing Ministry of Education Southeast University Nanjing 210096 China

The cavitation performance of propellers is studied based on viscous multiphase flow theories. With a hybrid grid based on Navier-Stokes （N-S） and bubble dynamics equations, some recent validation results are presented in this paper in the predictions of the thrust, the torque and the vapor volume fraction on the back side of propeller blade for a uniform inflow. The numerical predictions of the hydrodynamic performance and the sheet cavitation under several operating conditions for two propellers agree with the corresponding measured data in general. The thrust and the torque are plotted with respect to the advance rate and the cavitation number. The cavitation performance breakdown is closely related to the strong sheet cavitation around propellers. The models with parameters modified are shown to predict the propeller cavitation well.

关键词： cavitation Reynolds-Averaged Navier-Stokes （RANS） propeller sliding mesh multiphase flow

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Numerical simulation of hull/propeller interaction of submarine in submergence and near surface conditions

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Journal of Hydrodynamics 2014年第1期26卷 50-56页

作者：张楠张胜利 China Ship Scientific Research Center

Hull/propeller interaction is of great importance for powering performance prediction. The features of hull/propeller interaction of a submarine model with a high-skew five blade propeller in submergence and near surface conditions are numerically simulated. The effect of propeller rotation is simulated by the sliding mesh technique. Free surface is captured by the volume of fluid （VOF） method. Computed results including resistance, thrust, torque and self-propulsion factor are compared with experimental data. It shows fairly good agreement. The resistance and wave pattern of the model at different depths of submergence are computed. And the thrust, torque and self-propulsion factor of the model in submergence and near surface condition are compared to analyze the effect of free surface on self-propulsion performance. The results indicate that free surface has more influence on resistance than that on self-propulsion factors.

关键词： submarine hull/propeller interaction numerical simulation sliding mesh volume of fluid （VOF） method

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Numerical simulation on rolling characteristics of canard-controlled rockets with a free-spinning tail

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International Journal of Modeling, Simulation, and Scientific Computing 2017年第2期8卷 305-317页

作者： Yong-Chao Chen Xin-Bao Gao Min Gao Department of Electronic Engineering Shijiazhuang Mechanical Engineering College No.97 Heping West Road Shijiazhuang050003 HebeiP.R.China

Rolling characteristics of the canard-controlled rocket with a free-spinning tail are researched based on 3-dimensional Navier–Stokes(N–S)equations.The slide mesh technology of computational fluid dynamics is used to numerically simulate the flow field when tails rotate relative to the rocket body and research the varying pattern of roll moment coefficients of the whole rocket,tail,and canard with Mach number.The comparison between the computation results and a part of experimental data shows that the simulation method is accurate.The convergence criterion during the numerical simulation is put forward;the induced rotation speed of the free-spinning tail and the roll moment coefficient of the rocket under this rotation in actual flight when the canard deflects by 10◦for roll control are obtained and the reason for the free-spinning tail being able to eliminate roll coupling is analyzed.The research provides a reference for the configuration design of canard-controlled rockets with a free-spinning tail and the numerical simulation of their aerodynamic characteristics.

关键词： sliding mesh canard configuration free-spinning tail rolling control characteristics

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Numerical Simulation of Viscous Cavitating Flow Around A Ship Propeller

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China Ocean Engineering 2011年第3期25卷 539-548页

作者：朱志峰方世良王晓燕孟昭文刘平香杜选民 Key Laboratory of Underwater Acoustic Signal Processing of Ministry of Education Southeast University School of Electrical Engineering and Information Anhui University of Technology Science and Technology on Acoustic Antagonizing Laboratory Shanghai Marine ElectronicEquipment Research Institute

In the present study, cavitation and a ship propeller wake are reported by computed fluid dynamics based on viscous multiphase flow theory. Some recent validation results with a hybrid grid based on unsteady Navier-Stokes （N-S） and bubble dynamics equations are presented to predict velocity, pressure and vapor volume fraction in propeller wake in a uniform inflow. Numerical predictions of sheet cavitation, tip vortex cavitation and hub vortex cavitation are in agreement with the experimental data, same as numerical predictions of longitudinal and transversal evolution of the axial velocity. Blade and shaft rate frequency of propeller is well predicted by the computed results of pressure, and tip vortex is the most important to generate the pressure field within the near wake. The overall results indicate that the present approach is reliable for prediction of cavitation and propeller wake on the condition of uniform inflow.

关键词： cavitatingflow RANS propeller sliding mesh multiphaseflow

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Lattice Boltzmann Approach for Local Reference Frames

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Communications in Computational Physics 2011年第5期9卷 1193-1205页

作者： Raoyang Zhang Chenghai Sun Yanbing Li Rajani Satti Richard Shock James Hoch Hudong Chen EXA Corporation 55 Network DriveBurlingtonMA 01803USA

In this paper we present a generalized lattice Boltzmann based approach for sliding-mesh local reference frame.This scheme exactly conserves hydrodynamic fluxes across local reference frame interface.The accuracy and ... 详细信息

关键词： LBM LRF sliding mesh

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Study on the Prediction of Propeller Open-water Performance Using RANS Formula and sliding meshes

Study on the Prediction of Propeller Open-water Performance ...

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2011 4th IEEE International Conference on Computer Science and Information Technology(ICCSIT 2011)

作者： SHENG Li XIONG Ying WU Wei YANG Yong Dept.of Naval Architecture & Ocean Engineering Naval University of Engineering WuHan China

The open-water performance of different propellers are predicted by the RANS formula and RNG k ε model based on sliding mesh;the prediction results of the thrust coefficients,torque coefficients are compared with the experimental value.It is shown that,the numerical method presented in this paper has good precision in the prediction of propeller open-water performance,and the predicted pressure coefficients is basically coincident with the experimental data.

关键词： RANS formula sliding mesh propeller open-water performance Introduction

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