气幕围油栏利用气泡幕在水面形成的表面流和气泡破裂隆起高度实现围油。为对动水中气幕围油栏的围油性能进行研究,采用VOF(Volume Of Fuid)方法追踪油污和水的界面,以变密度单流体的连续性方程和κ-ε方程为控制方程建立动水中气幕围油...气幕围油栏利用气泡幕在水面形成的表面流和气泡破裂隆起高度实现围油。为对动水中气幕围油栏的围油性能进行研究,采用VOF(Volume Of Fuid)方法追踪油污和水的界面,以变密度单流体的连续性方程和κ-ε方程为控制方程建立动水中气幕围油栏的数学模型。首次引入有效围油距离D,通过监测有效围油距离并结合流场分析,探究围油过程。数值模拟结果与试验结果吻合较好,证明了动水中气幕围油栏围油的可行性。通过数值计算结果对比分析得出了动水中影响气幕围油栏围油性能的主要因素,对气幕围油栏的研发具有重要意义。展开更多
When evaluating ionic liquids （ILs） for extractive desulfurization （EDS） of fuel oils, the inevitable presence of water in the system may have a significant and in many cases strongly negative effect. However, few...When evaluating ionic liquids （ILs） for extractive desulfurization （EDS） of fuel oils, the inevitable presence of water in the system may have a significant and in many cases strongly negative effect. However, few studies have considered this particular issue and a promoted water effect on EDS is scarcely reported. In this work, COSMO-RS was firstly employed to calculate the capacity and selectivity for EDS of various IL/H20 mixtures, which cover different IL characters and a wide water concentration range. Experiments were then conducted with a representative IL [C4MIM]IH2P04], whose stable and even promoted extraction performance with a small amount of water was suggested by COSMO-RS. Through analyses of the desulfurization ratio, the cross- solubility and the water content in the desulfurized fuel, the promoted effect of water within a certain range （〈 10 wt%） was experimentally demonstrated. Moreover, such effect of water was explained combining the viscosity, the solvent-solute interactions and the COSMO-RS based analysis.展开更多
The purpose of this paper is to demonstrate and investigate the concepts of new deployable boom systems, which consist of the BCON （braid coated bi-convex tape） boom and the SMA-BCON （braid coated bi-shape memory a...The purpose of this paper is to demonstrate and investigate the concepts of new deployable boom systems, which consist of the BCON （braid coated bi-convex tape） boom and the SMA-BCON （braid coated bi-shape memory alloy convex tape） boom. Both booms are developed for the deployable membrane structures such as solar sails, thin membrane solar array panels, deorbit mechanisms for small satellites and reflectors of space solar power satellite, etc. BCON booms can store around polygonal or cylindrical center hub, and the booms can deploy by the stepwise manner by releasing a constraint mechanism which pins the boons into two or three points for the total length. SMA-BCON booms are mainly developed for a square center body systems, and SMA is adapted on the bent po^nts of the booms where stored around each edge of the center hub. Through the deployment experiments of both booms, the stepwise deployment behavior and its tendency are obtained. The design concept of BCON boom and SMA-BCON hnnm i~ demonstrated through this study.展开更多
文摘气幕围油栏利用气泡幕在水面形成的表面流和气泡破裂隆起高度实现围油。为对动水中气幕围油栏的围油性能进行研究,采用VOF(Volume Of Fuid)方法追踪油污和水的界面,以变密度单流体的连续性方程和κ-ε方程为控制方程建立动水中气幕围油栏的数学模型。首次引入有效围油距离D,通过监测有效围油距离并结合流场分析,探究围油过程。数值模拟结果与试验结果吻合较好,证明了动水中气幕围油栏围油的可行性。通过数值计算结果对比分析得出了动水中影响气幕围油栏围油性能的主要因素,对气幕围油栏的研发具有重要意义。
基金Supported by the National Natural Science Foundation of China(NSFC U1462123)PetroChina Innovation FoundationFundamental Research Funds for the Central Universities of China(22201313007)
文摘When evaluating ionic liquids （ILs） for extractive desulfurization （EDS） of fuel oils, the inevitable presence of water in the system may have a significant and in many cases strongly negative effect. However, few studies have considered this particular issue and a promoted water effect on EDS is scarcely reported. In this work, COSMO-RS was firstly employed to calculate the capacity and selectivity for EDS of various IL/H20 mixtures, which cover different IL characters and a wide water concentration range. Experiments were then conducted with a representative IL [C4MIM]IH2P04], whose stable and even promoted extraction performance with a small amount of water was suggested by COSMO-RS. Through analyses of the desulfurization ratio, the cross- solubility and the water content in the desulfurized fuel, the promoted effect of water within a certain range （〈 10 wt%） was experimentally demonstrated. Moreover, such effect of water was explained combining the viscosity, the solvent-solute interactions and the COSMO-RS based analysis.
文摘The purpose of this paper is to demonstrate and investigate the concepts of new deployable boom systems, which consist of the BCON （braid coated bi-convex tape） boom and the SMA-BCON （braid coated bi-shape memory alloy convex tape） boom. Both booms are developed for the deployable membrane structures such as solar sails, thin membrane solar array panels, deorbit mechanisms for small satellites and reflectors of space solar power satellite, etc. BCON booms can store around polygonal or cylindrical center hub, and the booms can deploy by the stepwise manner by releasing a constraint mechanism which pins the boons into two or three points for the total length. SMA-BCON booms are mainly developed for a square center body systems, and SMA is adapted on the bent po^nts of the booms where stored around each edge of the center hub. Through the deployment experiments of both booms, the stepwise deployment behavior and its tendency are obtained. The design concept of BCON boom and SMA-BCON hnnm i~ demonstrated through this study.
