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Processing Methods and Properties of Two Composite Geotextiles

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Journal of China Textile University(eng.ish Edition) 2000年第3期17卷 84-86页

作者：钱强储才元 coll. of Textiles China Textile Univ. Shanghai 200051 China

In order to develope new composite geotextiles with good comprehensive properties,the needle-punched composite geotextiles and adhesive bonded composite geotextiles were made in the factory and laboratory *** two processing methods were studied and the mechanical and hydraulic properties of the two kinds of products were tested and *** experimental resultsshow that the breaking streng.h of needle-punched composite geotextiles is much lower than that of adhesive bonded composite geotextiles and the latter also have better hydraulic properties than the former which used

关键词： composite geotextile adhesive permeability breaking streng.h peeling streng.h .

Stochastic Optimization of Dual Constraints with Anticipation

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Journal of China Textile University(eng.ish Edition) 2000年第3期17卷 123-126页

作者：费为银雷耀斌吴让泉邵世煌 Dept. of Appl. Math. Anhui Inst. of Mech. and Elec. Eng. Wuhu 241000 China coll. of Info. and Technol. China Textile Univ. Shanghai 200051 China Dept. of Appl. Math. China Textile Univ. Shanghai 200051 China

A stochastic control model is *** objective of the investor is to maximize expected utility from ***,the investor possesses informa-tion about the terminal values of the components of the Brownian motion which drives ... 详细信息

关键词： stochastic financial control enlargement of filtrations utility optimal decision anticipation .

Offshore Design Waves for Dayaowan Port Area of Dalian Port

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China Ocean eng.neering 1996年第2期11卷 203-218页

作者： Weng.Keqin Guest Associate Professor, hydraulic and Hydro-Power eng.neering Dept., Tsinghua University, Beijing 10084 Hydr. and Hydro-Pwr. eng. Dept. Tsinghua University Beijing 10084

This paper introduces the calculating procedure of the offshore design waves for the Dayaowan port area of Dalian Port. Some suggestions are proposed about the conventional calculating methods with measured waves data.

关键词： Dalian Port design waves calculation

Influence of Setting Condition on Characteristics of Savonius hydraulic Turbine with a Shield Plate

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Journal of Thermal Science 2011年第3期20卷 224-228页

作者： Shouichiro Iio Yusuke Katayama Fuminori Uchiyama Eiichi Sato Toshihiko Ikeda Faculity of eng. Shinshu University4-17-1 WakasatoNaganoJAPAN380-8553 Student of Shinshu University 4-17-1 WakasatoNaganoJAPAN380-8553 Flowserve Niigata Worthington Co. Ltd.1-32 ShinbashiKashiwazakiNiigataJAPAN945-0056 Faculty of eng. Niigata Institute of Technology1719 FujihashiKashiwazakiNiigataJAPAN945-1195

The aim of this investigation was to improve power performance of Savonius hydraulic turbine utilizing small stream for electric *** attempt was made to increase the power coefficient of runner by the use of flat shield plate placed upstream of the *** difference of the power coefficient is discussed in relation to clearance between the runner and the bottom wall and the rotation direction of the *** flow field around the runner was also examined visually to clarify influences of setting conditions on the power *** this study it was found that the power coefficient is achieved for 0.47 by only using a flat shield plate,the increase is up to 80% over the runner without the ***,it is the proper condition that clearance ratio is 0.73 in this study.

关键词： Nano-hydraulic turbine Savonius runner Shield plate Performance

PERIODIC BOUNDARY CONDITION IN SIMULATION OF TURBULENT FLOW

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Journal of Hydrodynamics 2002年第3期14卷 111-116页

作者： Zhou, Xiao-Quan Cao, Shu-You Qu, Lun-Fu Wu, Yu-Lin hydraulics Lab. of High Speed Flows Sichuan Univ. Chengdu 610065 China Dept. of Thermal eng. Tsinghua Univ. Beijing 100084 China

The simulations of the three-dimensional turbulent flows through hydraulic turbine components[1] were conducted based on the standard k-Ε turbulent model with body-fitted coordinates and staggering grid system. The SIMPLEC algorithm was adopted in the numerical procedure. A new method to treat the periodic boundary condition was used. The calculated results of the new method were compared with those of traditional ones. These results indicate that the new method can give much better results, and can be used in simulating flow through rotational impellers. The presented method can be combined with alternative turbulent model or employed in large eddy simulation.

关键词： Computer simulation hydraulic turbines Impellers Three dimensional Time varying systems

Development and Theoretic Validation of Model of Drum Level Sloshing

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Journal of Shanghai Jiaotong university(Science) 2007年第1期12卷 85-90,95页

作者：曹小玲刘孝锋苏明 Key Lab.for Power Machinery and eng. of Ministry of Education Shanghai Jiaotong Univ. Dept. of Computer Quanzhou Normal Univ.

In order to develop a feasible model of drum level sloshing, the mechanism of drum level sloshing was analyzed, and the model of drum level sloshing was developed on the Easy5 software flat. The thermodynamic property of the model was validated by using the reference model, which was set up by using the method of lump parameter. The results indicate that the model can precisely reflect the phenomena of thermodynamic property inside drum, and the numeric error is within 1%. And the hydraulic property of the model was validated by the analytical theory of liquid sloshing, and the results indicate that the hydraulic property inside drum can also be correctly reflected by the model, and the sloshing period error is within 5%. The important work was done for exploring modeling for drum level sloshing, research of drum level sloshing and precision controlling of drum level.

关键词： modularization modeling model of drum level sloshing combined cycle boiler false level

Groundwater Waves in a Coastal Fractured Aquifer of the Third Phase Qinshan Nuclear Power eng.neering Field

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Journal of Shanghai Jiaotong university(Science) 2005年第4期10卷 441-445页

作者：周念清唐益群唐和平 Dept. of Geotechnical eng. Tongji Univ. Shanghai 200092 China No.4 Research and Design Inst. of Nuclear Industry Shijiazhuang 050021

Tidal fluctuations of Hangzhou Bay produce progressive pressure waves in adjacent field fractured aquifers, as the pressure waves propagate, groundwater levels and hydraulic gradients continuously fluctuate. The effect of tidal fluctuations on groundwater flow can be determined using the mean hydraulic gradient that can be calculated by comparing mean ground and surface water *** fluctuation is shown to affect the piezometer readings taken in a nearshore fractured aquifer around the nuclear power eng.neering field. Continuous monitoring of a network of seven piezometers provided relations between the tidal cycle and the piezometer readings. The relations can be expressed in times of a time and amplitude scaling factor. The time lag and the tidal efficiency factor and waveleng.h are calculated using these parameters. It provides significant scientific basis to prevent tide and groundwater for the nuclear power eng.neering construction and safety run of nuclear power station in the future.

关键词： tidal fluctuation fractured aquifer hydraulic gradient time lag tidal efficiency factor nuclear power eng.neering

DISTRIBUTION OF LOCAL FRICTION IN AN OPEN CHANNEL

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DISTRIBUTION OF LOCAL FRICTION IN AN OPEN CHANNEL

第九次河流泥沙国际学术大会

作者： Mirali MOHAMMADI Dept. of Civil eng. Faculty of Eng. The University of Urmia Urmia 57169-33111 Iran Dept. of Civil Eng. Faculty of Eng. The Islamic Azad University Khoy Unit Khoy Iran

＜正＞In open channels, estimation of the local and global friction factor is one of the most important tasks and it sometimes is very difficult. This difficulty arises from the existence of the secondary flow cells and the boundary induced turbulence, both of which affect the distributions of depth-averaged velocity and boundary shear stress, and consequently the local friction factors. A series of measurements was undertaken for velocity and boundary shear stress in fully developed turbulent uniform flow for a smooth open channel. Equations relating the transverse distribution of apparent shear force across the channel boundary for various flow conditions are presented. The experimental overall friction factors were evaluated from the stage-discharge relationships applying the Darcy-Weisbach equation. Using the measured local depth-averaged velocity, Ud, and me local bed shear stress, τb, the local depth-averaged bed friction factor,fb, can be calculated for each lateral position by applying fb=8τb/ρUd 2 . The lateraldistribution of local depth-averaged friction factors show that the distributions are close together for low flow discharges in both sub critical and supercritical flows, but they are more variable for the higher flow discharges. In other words, the normalized local friction factors, fb/f, illustrate that the discrepancy in the higher flow rates are larger than the lower flow rates. More importantly, the Figures show that the local friction factor values tend towards a more constant distribution at high flow rates as the Froude numbers increase. It can also be seen that the local friction factor is found to be decreased from the sidewalls to the channel centerline.

关键词： Open channel flow Friction factor Depth-averaged velocity Boundary shear stress

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5T-50型脱粒机逐稿器机构运动分析

江苏农学院学报 1992年第1期13卷 55-60页

作者：殷珍荣张凤举 Dept.of Hydr.and Agric.eng. Jiangsu Agric Coll.Yangzhou 225001

对现有联合收割机、脱粒机的典型机构一平台逐稿器机构图形形成的独立闭链有关方程写成矩阵形式,采用机构最优化设计中的下降法对机构进行运动分析,把机构各构件位移、(角)速度、(角)加速度变化规律,通过图表,形象、清楚地表现出来.采... 详细信息

对现有联合收割机、脱粒机的典型机构一平台逐稿器机构图形形成的独立闭链有关方程写成矩阵形式,采用机构最优化设计中的下降法对机构进行运动分析,把机构各构件位移、(角)速度、(角)加速度变化规律,通过图表,形象、清楚地表现出来.采用闭链活动度准则计算机构自由度。

关键词：脱粒机逐稿器切割器运动分析