A STUDY ON CAVITATION AND CAVITATION DAMAGE IN A CAVITATION TUNNEL

The test results on cavitation and cavitation damage in a cavitation tunnel arepresented in this paper.The cavitator in the shape of 60 deg.symmetric wedge was mounted in-to the inlet of the working section of 20×40×170mm~3 in size.The velocities ranged from8.5m/s to 13.5m/s.At first,the flow structure around the wedge was revealed by a LaserDoppler Velocimetry.Then,the fluctuating pressure signals induced by vortex cavitation werepicked up by a micro-transducer.Cavitation erosion tests were just done at the velocity of13.5m/s.The aim of this work is to investigate the relation between cavitation inception andflow structure and to explore the dependence of cavitation damage on cavitation intensity.Thecavitation intensity which is defined as the power density per unit time can be regarded as the in-put of the test system.The intensity of cavitation damage is supposed to be the consumed powerdensity per unit time and considered as the output of the system of test,The ratio of the output tothe input is as the efficiency of the test system.The test results also show that the output is verysmall in quantity as compared with the input.     

新阶段无锡加快转型发展的探索与实践（上）

上世纪,无锡经历了由农业经济向工业经济、由内向型经济向外向型经济的两次成功转型,不仅从根本上改变了无锡原有的经济发展模式,极大地解放和发展了生产力,同时也深刻地改变了无锡的城乡结构和社会发展格局。进入新世纪以来,无锡步入了工业化中后期,面临着世界产业分工加速调整和传统模式遭遇发展瓶颈的双重挑战,开始思考新一轮重大转型。     

ON THE RELATION BETWEEN CAVITATION INCEPTION AND FLOW PATTERN ON PROPELLER BLADES

Oil flow visuallization on the model propellers with and without tripping devices atthe leading edge is revealed in this paper. Roughing leading edge with sand blasting was to simu-late the flow at full-scale condition. The observations of cavitation inception and the detection ofcavitation erosion were made in uniform and non-uniform flow respectively so as to consider theeffects of flow pattern on cavitation inception and to investigate the causes of difference in thelocations of cavitation erosion between model propeller and prototype. In addition, calculationsof the pressure distributions and the behaviour of boundary layer on the propeller blade were alsodone by using theoretical method. It is necessary to gain a better understanding of cavitation in-ception of the propeller.     

无锡市民间融资情况的调查报告

本次调查主要采取了抽样调查和重点调查相结合的调查方式．在全市范围内选择了家100企业和170户居民。其中：市区调查企业有40家．居民50户，江阴和宜兴的企业60家，居民120户。由于民间融资是游离于国家正规的金融机构之外的以资金筹措为主的融资活动，因而具有较强的隐秘性，很难测算其真实规模。本次调查我们主要以问卷为线索，通过推算和评估论证测得我市大致的民间融资规模：     

ON HYDRODYNAMIC INTERACTION UPON THE WAVE FORCES ON VERTICAL PILE ARRAY

A systematic study is carried out on the hydrodynamic interaction of sin-gle-row vertical pile array with a large number of piles by using the method of wave sourcedistribution.Some new properties for the hydrodynamic interaction among piles are firstreported in this paper.The Present study shows the importance and necessity of reassess-ing the hydrodynamic interaction among multiple objects of large number to reach a com-plete understanding on that subject.     

ON THE THEORETICAL PREDICTION OF CAVITATION INCEPTION

After a brief review of the traditional theoretical prediction methods,i.e.bubbledynamics method and pressure parameters method,this paper presents a new prediction method,called“fuzzy prediction method”.The new method consists of two predicting channels(analysischannel and empirical channel)and one scale-effect gate.It can not only give a reliable predic-tion result,but also,better than other method,predict cavitation type on the body.     

THREE-DIMENSIONAL HYDROELASTIC ANALYSIS IN TIME DOMAIN WITH APPLICATION TO AN ELASTIC SHIP MODEL

According to the Price-Wu condition at the interface between flexible marine structure and the surrounding fluid flow, a solution to the three-dimensional potential flow in time domain around a flexible structure traveling in waves is expressed with a boundary integral equation in the present paper, where the Green function, satisfying the linearized free surface condition for the time-dependent problem, is employed. A hydroe-lastic analysis directly in time domain to predict loads, motions, and structural responses of ships at steady forward speed in a seaway is formulated. As a example of application, the comparisons are made among the numerical results given by present method, the experimental measurements and the prediction provided by the three-dimensional hydroelas-ticity theory in frequency domain.     

基于组织结构的高校绩效预算考评体系构建

针对当前高校绩效预算管理研究中存在的考评责任主体不明确问题,论文试以高校组织结构为平台,以构建一个闭环的高校预算绩效考评体系为目标,分别从建立高校绩效预算评价体系,构建高校绩效预算考评指标,制定与考评结果相配套的促进机制三个方面对基于组织结构的高校绩效预算考评体系进行了研究。     

五大管理职能在现代制造业企业中的运用

现代制造企业为求生存与发展,必须不断加强五大管理职能在公司中的运用。通过计划、组织、领导、控制和创新,不断完善企业的各项机制与管理流程,提高企业的竞争能力,以满足客户的需求,从而获取利润,实现企业发展的各项目标。     

国有企业发挥党组织政治核心作用的调查与思考

为全面贯彻落实党的十七大、十七届四中全会和全国国有企业党的建设工作会议精神,切实加强和改进国有企业党建工作,我们和市国资委一起组成调研组,就现代企业制度条件下市属国有企业党组织如何发挥政治核心作用进行了专题调研。一、无锡国有企业党组织发挥政治核心作用的现状与特点分析1．建立完善国有企业领导体制,