异形管内水力、传热性能的数值模拟

通过数值计算考察了横纹管、缩放管两种异形管内的流动与传热性能。计算时采用标准k-ε湍流模型：采用控制容积法对控制方程进行离散化；采用SIMPLE算法进行压力修正：代数方程采用超松弛法迭代求解。很出了在充分发展流时的传热努塞尔数、速度、瘴撩系数及湍动能分布，并与光滑管内的流动传热进行了比较，分析了异形管在强化传热方面的机理。计算结果和实验值比较吻合。     

Distribution of OH and CH Radicals in the Boundary Layer with Ethanol Combustion

The influence of free-stream turbulence on the distributions of CH and OH radicals is studied with the use of optical methods of measurements in focused beams. The data on CH concentration are obtained for the minimum level of turbulence, and the OH concentration profiles are obtained for three levels of velocity fluctuations: 1, 8, and 18. It is shown that the regions where the OH and CH radicals are observed in the laminar boundary layer are shifted from the temperature maximum toward the oxidizer zone and toward the fuel zone, respectively. The highest level of the OH concentration is close to values typical of hydrogen combustion. The root-mean-square fluctuations of velocity and the mean values of the OH concentration vary nonmonotonically along the flame.__________Translated from Fizika Goreniya i Vzryva, Vol. 41, No. 4, pp. 22–28, July–August, 2005.     

动态全硫化共混型热塑性弹性体的研究进展

阐述了动态全硫化共混型热塑性弹性体（TPV）的发展历史，微观形态结构及其形成机理，制备技术，主要的品种及其加工和应用。     

全生物降解PBS的扩链改性研究

采用新型扩链剂2,2′-双(2-噁唑啉)(BOZ)对聚丁二酸丁二醇酯(PBS)进行扩链,研究了BOZ加入量、稳定剂加入量、时间、温度对扩链反应的影响。结果表明,选择最佳条件,扩链后的PBS的相对分子质量较未扩链PBS的相对分子质量大为增加,而且扩链PBS相对分子质量分布与未扩链PBS基本一致,说明PBS扩链后的线性度与起始PBS相同,没有支化或交联反应发生。     

Hydrodynamics of disturbed flow and erosion—corrosion. Part I — Single-phase flow study

Numerical simulations of turbulent flow have been used to determine the flow structure in a sudden pipe expansion, in order to explain the effects of disturbed flow on mass transfer controlled erosion–corrosion. Previously determined rates of mass transfer through the liquid boundary layer have been directly related to the predicted levels of near-wall turbulence. When rust films are present, the turbulent fluctuations affect both the mass transfer through the boundary layer and the removal of the film. The determining resistance to mass transfer, under the conditions examined, was that of the rust film.     

New analysis of non-newtonian turbulent flowndashyield-power-law fluids

The writers' new analysis of non-Newtonian turbulent flow is extended to the yield-power-law model. As the value of the exponent of the yield-power law decreases from unity, the calculated friction factor begins by converging toward the Newtonian line at high velocity, then parallels it, and finally diverges downward. This prediction agrees with previously unexplained experimental results.     

等离子体煤气化反应器内部流动数值模拟及设计优化的初步研究

本文对一种等离子体煤气化反应器内部湍流、两相流动和燃烧化学反应等复杂流动现象进行了三维数值模拟 ,得出了其内部的温度分布、速度分布和组分浓度分布 ,在对计算结果进行分析的基础上 ,提出了等离子体煤气化反应器的一种优化设计方案 ,并对此方案进行了不同等离子体流速下的数值模拟和比较分析 ,以确定气流参数的最佳匹配 ;数值分析结果表明 :改进的设计方案和气流参数匹配提高了等离子体热源利用的效率和煤气转化的效率     

Characterisation of three different impellers using the LDV-technique

A characterisation of three commonly used impellers was made in this study by measuring local mean velocities and the fluctuations of these velocities with the LDV technique. The data was used to estimate volumetric flow, velocity fluctuations and turbulent intensity in the impeller region of the tank. The impellers investigated were a high flow impeller, a pitched blade turbine and a Rushton turbine. The cylindrical vessel used was made of Perspex, had a dished bottom (DIN 28013), was equipped with four baffles and had an inner diameter of 0.45 m. It was found that the bulk velocities could be scaled with the tip-speed of the impeller (ND). The flow rate at constant impeller speed increased in the order high flow impeller — Rushton turbine — pitched blade turbine. The corresponding order for the turbulence fluctuation is: high flow impeller — pitched blade turbine — Rushton turbine. The velocity profile of the flow out from the high flow impeller was furthermore, not as smooth as could be expected.     

LDA Measurements on a Turbulent Gas/Liquid/Fibre Suspension

Detailed continuous phase flow measurements (mean and RMS velocities) by Laser Doppler Anemometry (LDA) of a turbulent gas/fibre/liquid suspension in a rotary shear tester have been performed with simultaneous torque measurements. The model system comprises a refractive‐index matched suspension in the 4‐12% wt. range with gas contents up to 15% vol. The two transition points, found by Andersson and Rasmuson (2000), were detected also with gas present and appear at higher impeller speeds with increasing gas and fibre concentrations. Plotting RMS and mean velocities versus impeller speed and power input, it is found that both decrease with increasing gas and fibre contents.     

综采工作面初采初放期间矿压显现规律分析与总结

2903综采工作面是城郊煤矿二水平第一个单顺槽沿空掘巷综采工作面。项目针对该工作面初采、初放期间的矿压显现规律进行了数据采集、分析和总结。