矿井提升系统安全制动性能的改进

对现有提升机制动系统不同工况的安全制动性能进行了分析 ,指出了其不足之处 ,提出了改进方案。     

氯盐体系硝酸/盐酸脉冲萃取分离装置水力学研究

硝酸-氯化钾直接法可低成本制备熔盐级硝酸钾,溶剂萃取分离氯盐溶液中的硝酸和盐酸是关键步骤之一。研究了处理H⁺/K⁺/Cl^-/H₂O-磷酸三丁酯/磺化煤油体系脉冲筛板萃取塔的水力学性能,结果表明分散相液滴直径随脉冲强度的增大而减小,与两相表观流速无关;存留分数随脉冲强度的增大呈现先减小后增大的趋势,随两相表观流速的增大而增大。拟合得到了液滴直径与存留分数的Kumar-Hartland关联式,两者计算值和实验值的平均相对偏差（AARD）分别为4.74%与5.60%。     

新概念熔盐堆的固有安全性及相关关键问题研究

新概念熔盐堆是6种第四代反应堆中唯一的液体燃料反应堆，在固有安全性、经济性、核资源可持续发展及防核扩散等方面具有其它反应堆无法比拟的优点。针对熔盐堆的特点，建立通用的物理分析、热工水力分析和安全分析模型，并采用隐式方法实现物理热工的耦合。将建立的数学模型应用于锕系元素再循环嬗变熔盐堆（MOSART）的计算，对其堆芯物理特性、热工水力特性和安全特性进行了系统分析，考察了入口温度、速度及燃料盐在堆芯外运行时间的影响。     

Water hydraulic manipulator for fail safe and fault tolerant remote handling operations at ITER

Department of Intelligent Hydraulics and Automation (IHA) of Tampere University of Technology has been involved in the European Fusion program since 1994 within the ITER reactor maintenance activities. In this paper we discuss the design and development of a six degrees of freedom water hydraulic manipulator with a force feedback for teleoperation tasks. The manipulator is planned to be delivered to Divertor Test Platform 2 (DTP2) during year 2008. The paper also discusses the possibility to improve the fail safe and redundant operation of the manipulator. During the design of the water hydraulic manipulator, special provisions have been made in order to meet the safety requirements such as servo valve block for redundant operation and safety vane brakes for fail safe operation.     

介绍一种铝加工用新型UCF离心式净油器

介绍了新型UCF离心式系列净油器新结构工作原理与特点,例举了部分使用效果和数据。     

Thermal Fluid-Structure Interaction Analysis for the Upper Structure of LMFRs

This paper describes a thermal fluid-structure interaction analysis code FLUSH that calculates both thermal-hydraulics and thermal structure response at the same time. This code has been developed to evaluate the thermal responses of the upper structures of LMFRs, using two different analysis codes of α-FLOW and FINAS. The heat flux on the boundary surface of the fluid region and the temperature on the boundary of the structure region are exchanged in every iterative cycle as the new boundary conditions, and finally the unified thermal fields are calculated. The different mesh method and the detail thermal radiation model were also developed to apply for the large scale models.

The 2-D model of the basic experiment for the cover gas thermal-hydraulics was calculated to verify this iterative method. The calculated average temperature on the boundary agreed well with the experimental results. The 3-D large scale models of the out-of-pile experiment for MONJU shield plug were also calculated to verify this method. The calculated temperature both in the annulus and the shield plug agreed well with the experiments. These studies showed that this iterative method of FLUSH was very effective for the predictions in the strong coupled thermal fields.     

Pressure Loss at the Bit While Drilling with Foam

Abstract

Foam is one of the most frequently used drilling fluids at underbalanced drilling operations. As foam flows, due to the pressure drop, a volumetric expansion is observed, which causes the foam quality to increase in the same direction with flow. Flow of foams through circular pipes and annular geometries are well studied. Interestingly, although one of the major sources of pressure drop is at the bit, there have been few studies of this subject for foams. Many drilling parameters including hole cleaning capacity, volumetric requirements of liquid and gas phase, and backpressure are out of control if the pressure drop at the bit is not accurately determined, even though pressure drops inside the pipes and wellbore are properly determined. This article introduces a more accurate model for estimating the pressure drop of foam flowing through the bit. The major difference between the proposed and the existing models is that the proposed model includes the effect of foam expansion and velocity change as a function of pressure. Pressure drop has been observed to increase significantly as the upstream pressure and foam average velocity increases when compared with the existing models. For the same flow conditions, pressure drop decreases as the foam quality increases, and as the upstream pressure increases, pressure drop also increases. The existing models cannot detect this event at all. In some cases, the pressure drop at the bit can be 10 times greater than the pressure drop predicted from existing models.     

池式快堆三维热工流体力学设计研究

随着计算机软硬件技术的发展,三维数值分析技术已经成为池式快堆堆芯和钠池热工设计和计算分析的重要组成部分,并在其中发挥着不可替代的作用.通过对池式快堆几个典型热工现象的分析,展示了我国第一座池式快堆(中国实验快堆)热工设计和安全分析中所拥有的设计手段和工具,总结了三维数值分析技术在快堆工程中的应用,并指出了其对今后快堆热工设计的重要意义.     

三峡工程与长江中下游生态环境

三峡工程是在长江上兴建的宏伟工程，它控制了长江上游的全部水量，改变了我国第一大河的水流情势。三峡水库的调洪使荆江河段的防洪标准由目前的十年一遇提高到百年一遇；配合分蓄洪工程，荆江干堤可抵御千年一遇洪水。对中游广大平原地区，可避免像1954年那样的洪水灾难重演。三峡工程的防洪效益是它对长江中下游生态环境得以改善的最大贡献。此外三峡工程还可向中下游地区提供可靠的清洁能源，有利于改善大气环境；帮助提高中下游河道每年枯水季的通航能力；大坝是安全的；对这一地区的总体自然环境的保护也是利多于弊。本文对三峡工程蓄水一年来有关长江中下游的生态环境进行介绍。