检索结果-南通市图书馆

Simplified hydrodynamic models for the analysis of marine propellers in a wake-field

Journal of Hydrodynamics 2013年第6期25卷 954-965页

作者： DURANTE D. DUBBIOSO G. TESTA C. CNR-INSEAN The Italian Ship Model Basin

This paper presents a comparison among different hydrodynamic models for the analysis of the unsteady loads delivered by a marine propeller working in an axial, non-uniform inflow. Specifically, for a propeller subjected to a wake-field dominated by local high-frequency changes in space, the unsteady hydroloads predicted by the Nakatake formulation are compared with those given by the Theodorsen and Sears theories, respectively. Drawbacks and potentialities of these approaches are highlighted to assess a computationally efficient hydrodynamic solver for the analysis of operating conditions where propeller blades are significantly perturbed by a multi-harmonic onset-flow. Guidelines coming from this investigation may drive the choice of a fast and reliable unsteady propeller modeling that represents a good trade-off between accuracy of simulation and cost of computation within implementation in Computational Fluid Dynamics （CFD） solvers. The hydrodynamic formulations herein proposed are validated through numerical comparisons with the （accurate but computationally expensive） propeller loads predicted by a fully 3-D panel-method Boundary Element Method （BEM） solver, suited for the analysis of propellers operating in a complex hydrodynamic environment.

关键词： actuator disk airfoil theories Boundary Element Method (BEM) hydrodynamics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Numerical Simulation of Flow Instabilities in HighSpeed Multistage Compressors

引用

Journal of Thermal Science 1999年第1期8卷 23-31页

作者： JunHu ThomasPeters 等 PowerEngineeringDepartment NanjingUniversityofAeronautics＆AstronauticsNanjing210016China Institutef

In the present paper, a nonlinear multi 'actuator disk' model is proposed to analyze the dynamicbehavior of flow instabilities, including rotating stall and surge, in high speed multistage axial compressors. The model describes the duct flow fields using two dimensional, compressible and unsteadyEuler equations, and accounts for the influences of downstream plenum and throttle in the system aswell. It replaces each blade row of multistage compressors with a disk. For numerical calculations,the time marching procedure, using MacCormack two steps scheme, is used. The main purpose of thispaper is to predict the mechanism of two dimensional short wavelength rotating stall inception and theinteraction between blade rows in high speed multistage compressors. It has been demonstrated thatthe model has the ability to predict those phenomena, and the results show that some system parameters have a strong effect on the stall features as well. Results for a five stage high speed compressorare analyzed in detail, and comparison with the experimental data demonstrates that the model andcalculating results are reliable.

关键词： actuator disk flow instability short wavelength rotating stall inception blade row interaction.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

How far the wake of a wind farm can persist for?

引用

Theoretical & Applied Mechanics Letters 2022年第1期12卷 17-22页

作者： Guodan Dong Zhaobin Li Jianhua Qin Xiaolei Yang The State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Sciences University of Chinese Academy of SciencesBeijing 100049China

With the increased penetration of wind energy in our nation’s energy portfolio, wind farms are placed in a way close to each other. Thus, their wakes have to be fully considered in the design and operation of a wind farm. In this study, we investigate the wake of a wind farm using large-eddy simulation with wind turbine rotor modelled by the actuator disk model. The simulated results show that the wake of a wind farm can persist for a long distance in its downstream. For the considered wind farm layout, the velocity in the wake recovers 95% of that of the undisturbed inflow at 55 rotor diameters downstream from its last row, suggesting that the wake of a wind farm should be fully considered in the optimal design and operation for its downstream wind farms.

关键词： Wind farm wake Large-eddy simulation actuator disk Wind turbine wake

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Parametric study of the impact of hull form deformations of an inland ship on its hydrodynamic performances in shallow water using CFD

Parametric study of the impact of hull form deformations of ...

引用

第九届全国流体力学学术会议

作者：曹洪建 Maёl RIVOAL 裴志勇秦江涛 Pierrick SERGENT Aurelien DROUET Advanced Technology & Research Centre Bureau Veritas Marine(China) Co.Ltd HydrOcean Bureau Veritas Department of Ocean Engineering School of TransportationWuhan University of Technology

This paper presents the study of the impact of parametric hull form deformations of an inland ship on its hydrodynamic performances in shallow water using *** parametric hull form deformation is performed by the in-house hull modeling software *** resistance and delivered power of all designs are evaluated through resistance and self-propulsion computations using ISIS-CFD *** CFD computations take into account the shallow water *** impact of each deformation on the total resistance and delivered power is investigated by the comparison between initial and deformed hull *** results indicate that particular deformations have significant impact on the hydrodynamic performances and are beneficial to the hull form design.

关键词： parametric deformation shallow water resistance self-propulsion actuator disk

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：