Study of the Dump Diffuser Optimization for Gas Turbine Combustors

扩压器作为连接高压压气机和燃烧室进口的关键部件，能够增压减速、降低流动损失，使燃烧稳定，提高发动机效率。 本文采用实验和数值模拟结合的方法对突扩扩压器进行了深入的研究，利用水槽PIV设备，采集扩压器内部的速度场信息与不同计算模型的计算结果对比，确定最佳的计算模型，确定出雷诺应力模型预测的扩压器流场信息与实验数据吻合的最佳；通过改变前置扩压器扩张角、突扩间隙等几何参数，研究了几何参数对扩压器性能的影响，并提出了计算总压损失和静压恢复的经验公式，利用该公式可以计算最佳扩张角、前置扩压器是否存在分离等重要信息。 研究表明大部分静压恢复发生在前置扩压器，大部分总压损失发生在突扩区。为了增大静压恢复...Diffuser is one component of the gas turbine combustor following the compressor. Its primary function is to slow down the air flow delivered by the compressor in order to promote efficient combustion and avoid large total pressure losses. In this paper, an experimental and computational study of cold flow in the dump diffusers was presented. PIV experiments were conducted in an simplified test m...学位：工学硕士院系专业：物理与机电工程学院_航空宇航推进理论与工程学号：3202012115269

Research on the College Student Financial Assistance and Service System of Huaqiao University from the Perspective of Educational Equity

教育是民生之基，教育公平是构建和谐社会、全面建设小康社会的应有之义。教育公平是社会公平的基石，是社会共享的前提，是社会融合的保障，从教育公平理论可知，教育机会的均等是教育公平的起点，教育效果的相对均等是教育事业孜孜不倦的追求。各地高校针对家庭经济困难学生的资助服务系统就是确保教育机会均等的一项重要举措。华侨大学一方面已经形成以奖贷学金、绿色通道、勤工助学、困难补助等多元化的资助服务系统，近年来基本每年有效保障4500位左右家庭困难学生顺利完成高等教育；另一方面，资助服务还存在宣传力度不够、管理机制滞后、育人程度有待提高等问题，迫切需要完善。 本文的研究思路和研究内容分为六个部分。第一部分，绪...Education is the basis of people's livelihood.Education equity is necessaryto build a harmonious society and a moderately prosperous society.Education equity is the cornerstone of social justice, the premise of social sharing, and the security of social integration. From education equity theory, the equality of educational opportunities is the starting point of education equity;relatively equal ed...学位：公共管理硕士院系专业：公共事务学院_公共管理硕士学号：1392012115040

Empirical Study on the Influence of Intervention Events to Chinese Stock Market

自1965年尤金•法玛(EugeneFama)首次提出有效市场（EfficientMarket）的概念以来，信息如何影响股票市场收益率就一直是学术界和实业界感兴趣的研究内容。中国作为全球第二大经济体，与发达国家成熟的资本市场相比，其股市的设立与发展具有自身的特点。为了研究这种特点，本文在有效市场假说下，以利率、存款准备金率调整以及美联储量化宽松政策为介入事件变量，利用介入事件分析（InterventionAnalysis）模型，实证研究此类信息对中国股票形成的短期、中期以及长期影响。这对于进一步完善中国股票市场和投资者规避风险均具有现实参考价值。 论文的主要研究内容包括以下几方面...1997 to December 31, 2013, use intervention analysis model to quantitatively analyze the short-term impact of interest rate and deposit reserve ratio on China's stock market, considering the impact of increasing and decreasing interest rate and deposit reserve ratio as well as the calendar effects; (3) Based on the Shanghai Composite Index and Dow Jones industrial average daily returns data from J...学位：经济学硕士院系专业：经济学院_数量经济学学号：1542011115192

Jetting Behaviors of Pulsated Single-Jet Based on Electrohydrodynamics

基于电液动力学（EHD）原理的脉冲喷射是一种新型的按需喷印方式，它是在脉冲电场力的作用下，诱使喷嘴中的溶液形成锥射流形态进行喷射。这种脉冲喷射方式可将各种功能性材料直接喷射到不同性质的收集板上，实现无掩膜图案化，正成为柔性电子领域中潜在的加工方法。与传统的喷印技术相比，脉冲式电液动力耦合喷印技术可喷出较高粘度的溶液，并且其射流直径远小于喷嘴尺寸。 为了将脉冲式电液动力耦合喷印技术应用于功能材料的直写中，并实现溶液喷射的有效控制，本文讨论直写技术使用的单股射流模式，阐述近场脉冲式单股射流的喷射条件，研究空芯喷嘴与有芯喷嘴中单股射流喷射频率与沉积微滴尺寸的分布。 通过实验考察溶液与收集板特性对...The pulsated ejection technology based on electrohydrodynamics (EHD) is a way to jet printing on demand. The polymeric solution at the outlet of a nozzle is induced by an electrostatic force and emitted in cone-jet. EHD printing, a potential process in the production of flexible electronics, may directly deposit a variety of materials onto collectors with different properties and realize a maskl...学位：工学博士院系专业：物理与机电工程学院机电工程系_机械电子工程学号：1992007015366

Corporate Social Responsibility and Financial Performance From the Consumer Perspective——Introducing Value Engineering Theory

随着经济全球化进程的进一步加快，市场竞争日趋激烈，企业社会责任已经成为企业获得竞争优势的重要战略。与此同时，消费者对企业社会责任的期望和要求也进一步提高，他们期望企业不仅能够处理好与其出售的产品和服务相关的问题，更要求企业能够处理好社会和环境问题。尽管以往丰富的理论研究证明，积极的社会责任活动有利于促进企业绩效的提高，但现实中企业消极且低水平的社会责任活动实践却与之形成了鲜明对比，理论成果与实践应用相脱节。一方面是因为企业出于对社会责任成本与收益的考虑，而更重要的另一方面则是因为大多数的企业并不知道如何才能做好社会责任活动。大多数企业既不清楚消费者对社会责任的期望，也不清楚自身社会责任水平与这...With the economic globalization speeding up, market competition is increasingly fierce, and corporate social responsibility (CSR) has become an important strategy for companies to gain competitive advantages. At the same time, both consumers’ expectations and demands for corporate social responsibility are further improved, not only consumers expect companies to handle issues related to the produc...学位：管理学硕士院系专业：管理学院_企业管理(含财务管理、市场营销、人力资源管理)学号：1762011115127

Research on Manufacturing Process of Flexible Printed Circuit by Aerosol Deposition

气浮沉积是一种新型的非接触和无掩膜的喷印工艺，可以喷印小于50μm的精细结构，最小喷印线宽达10μm。该工艺可以喷印多种类型的墨水，包括金属、半导体、绝缘体、磁体、聚合物等，墨水的粘度最高可达2500cp。气浮沉积工艺已经在很多领域获得了应用，例如：集成电路、打印传感器、太阳能电池、电气互连等。柔性印制电路作为电子互连的基础材料，是电子产品的最重要的部件之一。目前传统减成法制造柔性电路工艺复杂、材料利用率低、环境污染严重、制造成本高，而且受腐铜侧蚀等因素影响，很难制造出线宽小于100μm的柔性电路。 针对传统工艺在制造更小线宽柔性电路上的限制，以及高污染、低利用率、高成本等问题，本文使用气浮...Aerosol Deposition is an innovative non-contact and maskless printing process for fine structures below 50 洀, and the minimum line width can reach 10 洀. This process has ability to print with a wide variety of nano materials, including metal, semiconductor, insulator, magnet, polymer and so on. The viscosity of the ink used for printing up to 2500cp. And the aerosol deposition process has been app...学位：工学硕士院系专业：物理与机电工程学院_测试计量技术及仪器学号：1992010115270

当代农民工社会公平感:一个经济社会学分析框架

社会成员对于社会资源分配感觉是否合理即社会公平感高低对社会的平稳运行具有重要意义。文章从经济社会学角度入手,将社会经济地位分解为主观社会经济地位和客观社会经济地位,将社区融合分解为社区认同、社区交往、社区参与三个维度,运用多元回归方法分析了社会经济地位和社区融合对农民工社会公平感的影响。研究发现,主客观社会经济地位对农民工的社会公平感均有影响,社区融合的三个维度对农民工的公平感均具有统计显著性,即农民工的社区认同度越高,与本地居民交往越频繁,向社区组织提供意见或建议的频率越高,公平感就越强。文章最后基于研究结论提出了提升农民工社会公平感和增进农民工城市社会融合的对策和建议。国家社会科学基金项目(15BSH070

Performance Analysis of Three Kinds of Aero-Engine with Inter-Stage Turbine Burner

为探究级间燃烧室对各种航空发动机的性能影响,利用热力循环原理分别计算了在有无级间燃烧室的情况下涡喷、涡扇和涡轴发动机的性能结果并与实际型号做出对比。通过计算获得了上述三种发动机在加入级间燃烧室后的单位推力和耗油率随飞行马赫数等参数在一定范围内变化的曲线。结果表明加入级间燃烧室后对各种发动机的动力性能提升都在10%以上,个别涡轴发动机可达30%。同时若能将加入级间燃烧室后增加的质量控制在一定范围内,则对于各型发动机均可提高其推重比。In order to investigate the effects of the inter-stage turbine burner( ITB) on aero-engines,the thermodynamic cycle analysis was performed to demonstrate the performance of three kinds of aero-engines with the inter-stage turbine burners.The performance curves for different flight and operation conditions were obtained by calculation.Results show that specific thrust can be improved by at least 10%,and for one turboshaft engine the specific thrust even can be improved by 30%.Based on comparison between the real aero-engine performance and the calculation results,the errors are acceptable and the thrust-weight ratios show the potential capability of ITB application.国家自然科学基金(11002125;51106131); 中央高校基本科研业务费专项资金(2013121019

Effects of Pre-Diffuser on Performance of Dump Diffuser

研究了突扩扩压器中前置扩压器各参数与总压损失和静压恢复间的关系。采用实验与fluEnT计算结合的方法,通过水槽PIV实验得出扩压器内的流场信息,对照不同的湍流模型,得出最佳的计算方案。根据此计算方案计算不同的扩张角下前置扩压器性能的变化,得出各参数之间的规律。结果表明雷诺应力模型能够较好地预测扩压器内部流场;前置扩压器扩张角存在一个最佳值,大于最佳值前置扩压器会出现流动分离;结合理论分析和计算数据总结出计算前置扩压器总压损失系数和静压恢复系数的公式,利用此公式还可求出最佳的前置扩张角和前置扩压器长度,计算误差在5%左右。Diffuser is one key component of the gas turbine combustor following the compressor.Its primary function is to slow down the air flow delivered by the compressor in order to promote efficient combustion and avoid large total pressure losses.An experimental and computational study of cold flow in the dump diffusers was presented.The main aims were to evaluate the influence of pre-diffuser wall angle and pre-diffuser length on the performance of dump diffusers,and to identify the pressure loss mechanisms.PIV experiments were conducted in a simplified test model to help choose of congruent turbulence model.It was observed that apparent flow separation occurred on pre-diffuser wall when pre-diffuser wall angle amplified to certain degree.The pre-diffuser exit flow was distorted,indicating that the uniform exit conditions typically assumed in the diffuser design were violated.Skew distribution of the pre-diffuser outlet flow can result in strong transverse mixing for liquid,the total pressure loss of pre-diffuser increases significantly.The formula of the total pressure loss coefficient and the pressure recovery coefficient was developed.The optimal pre-diffuser length and pre-diffuser wall angle can be conveniently obtained by this equation,the calculation error was less than 5%.中央高校基本业务费(2013121019); 航空基金(20132268003