基准流场的设计评估与测量不确定度分析

发布时间：2018-03-19 14:29

本文选题：基准流场　切入点：粒子图像测速　出处：《上海交通大学》2014年博士论文　论文类型：学位论文

【摘要】：不同于宏观水动力量的验证与比对，作为场域分布量的流场特性是以时空变化的速度矢量来表征的，这给了解流场、测量流场、控制与利用流动带来了更加细化复杂的要求。随着以PIV为代表的现代流场测试技术与CFD数值模拟方法的迅速发展，使得当今船舶与海洋工程水动力学研究更加关注流场信息的获取。为从基础的层面，提供流场评估预报手段的标尺，基准流场及其“标准数据”的研究成为了近年来国际水动力学界的前沿基础研究热点。流场与流动是有千差万别的，基准流场应结合不同水动力学问题的关注，而专门设计实施。2008年以来，ITTC（International Towing TankConference,国际拖曳水池大会）和HTA（Hydro-Testing Alliance,（欧洲）水动力学试验联盟）前后启动了船舶与海洋工程水动力学领域的基准流场研究工作，分别初步提出了两维和三维基准流场的设计方案。国内的相关研究工作，仍处于空白。论文选择这一国际船舶与海洋工程水动力学领域前沿基础性课题方向，开展了较系统的独立研究工作。首先，论文引入成熟CFD工具，系统细化拓展了ITTC两维基准流场的设计方案，量化预评估了设计参数对流动特性的影响规律，形成了两维基准流场的设计与PIV流场测量方案；其次，作为参与ITTC精细流场测试专家委员会在研工作的一部分，在国内外首次实施了两维基准流场的PIV测试试验，评估了试验要素对流场品质的量化影响，并与CFD预评估进行分析比对；第三，学习实践了PIV流场测量不确定度分析ITTC推荐规程，并针对流场的空间不均匀特性，创新尝试进行了测量流场局部不确定度分析研究，获得了首批具有量化测量不确定度量值的两维基准流场基准检验数据；最后，基于同样的研究思路，对HTA提出的三维基准流场初步设计方案，进行了CFD预评估，并结合HTA提供的三家试验机构的PIV测试结果的综合分析，给出了三维基准流场设计与PIV测量的修正方案。基准流场的设计评估及其测量不确定度分析，是一项国内尚属空白的前沿基础性工作，涉及并有助于流场测试技术与CFD数值模拟技术。论文比较完整地实现了两维基准流场的设计、PIV流场测试及其测量结果的不确定度分析，获得了具有自主知识产权的基准检验试验数据；对三维基准流场的设计方案也已完成，为后续的试验实施奠定了基础。本文的主要创新点有：（1）基准流场的方案设计，主要是源于研究设计者对流动现象经验性的认识知识；本文系统地引入成熟CFD手段，结合经验认识变化设计参数，针对方案设计要素对流场特性影响规律进行预评估研究，定性与定量地得到了二维和三维基准流场的合理设计方案。（2）为细化评价空间非均匀流场的测试质量，在探索应用PIV流场测量不确定度分析方法的ITTC推荐规程的基础上，本文创新开展了PIV流场局部测量不确定度分析方法的研究，综合评估了二维基准流场的测量结果，丰富拓展了PIV流场测量可靠性度量的评价方法，，对提高复杂流场的PIV测试质量有重要的实用价值。（3）论文开展的二维基准流场的基准检验试验、获取的具有测量不确定度分析的结果数据，以及针对三维基准流场的设计与测试方案的修订建议，均是国内外首次开展的前沿基础性工作，相关研究结果将提交纳入2014年ITTC大会的精细流场测试专家委员会的最终报告。
[Abstract]:Different from the macroscopic hydrodynamic forces as validation and comparison, the characteristics of flow field distribution of domain by using the velocity vector field is used to characterize the temporal and spatial variation, to understand the flow field, flow field, flow control and utilization brought require more detailed and complex. With the rapid development of modern simulation technology and CFD to numerical flow field test the representative of PIV, the ship and Ocean Engineering Hydrodynamics research pays more attention to obtain information of the flow field. From the basic level, provide flow estimation and prediction means of reference scale, flow field and "standard data" has become in recent years the international community water dynamics leading basic research hotspot.
The flow field and the flow is different, the benchmark should be combined with different water flow dynamics problem, since specially designed for the implementation of the.2008, ITTC (International Towing TankConference, the international towing tank Conference) and HTA (Hydro-Testing Alliance (Europe) test Alliance launched water dynamics) before and after the ship and ocean Engineering Hydrodynamics benchmark study on flow field of work, were initially put forward a design scheme of two and three-dimensional benchmark flow field. The domestic research work, is still in the blank.
The choice of the international ship and Ocean Engineering Hydrodynamics frontier fundamental research direction, to carry out independent research systematically. Firstly, the introduction of mature CFD tools, the system expands the refinement design scheme of ITTC two dimensional reference field, quantitative pre assessment influence of design parameters on the flow characteristics, the formation of the design of two dimensional flow field and flow field measurement datum PIV scheme; secondly, as in ITTC fine flow field test committee of experts in a part of the research work at home and abroad, the first implementation of the PIV test of two dimensional reference field, evaluated the influence of quantitative quality flow field test elements, and analyzed in comparison with the CFD pre evaluation; third, the study and practice of PIV flow measurement uncertainty analysis and recommendations for ITTC, according to the flow field of the spatially inhomogeneous characteristics, innovation was measured by the flow field of uncertainty The uncertainty analysis, two dimensional flow field benchmark benchmark test data measure the quantitative measurement with the research ideas; finally, based on the same, a preliminary design of the three-dimensional flow field of reference proposed by HTA, the pre CFD assessment, combined with comprehensive analysis provided by HTA three test PIV test results of the mechanism and the correction plan is designed with PIV datum flow measurement.
The uncertainty analysis of design evaluation and measurement reference field, is a domestic leading basic work is still blank, and relates to contribute to the numerical testing technology and simulation technology of CFD. The more complete realization of the design of two dimensional benchmark flow, PIV flow field measurement and its uncertainty analysis of measurement results the benchmark test data, with independent intellectual property rights; the design scheme of the 3D flow field of reference has been completed, which laid the foundation for the follow-up test.
The main innovations of this article are:
(1) design reference field, is mainly due to the research on the flow phenomenon of empirical designer knowledge; this paper systematically introduces the mature CFD means of understanding the change of design parameters for the combination of experience design elements influence the flow field characteristics of the pre assessment research, qualitative and quantitative to obtain reasonable design scheme of 2D and 3D the reference flow field.
(2) to test the quality of non uniform flow detailed evaluation space, to explore the application of PIV based uncertainty analysis method of ITTC Recommended Practice for the measurement of flow field, the innovation of this paper carried out the PIV flow field measurement uncertainty analysis method, comprehensive evaluation of the measurement results of two-dimensional benchmark flow field, enrich the evaluation method PIV measurement of flow field measurement reliability, has important practical value to improve the quality of PIV testing in complex flow fields.
(3) the benchmark test paper of the two-dimensional reference field, obtained with uncertainty analysis results, and design and testing scheme for three-dimensional flow field of the benchmark revision, are the leading basic work at home and abroad for the first time to carry out the relevant research results will be submitted to the final report of the Committee of experts fine flow test in the 2014 ITTC conference.

【学位授予单位】：上海交通大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：U661.1

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