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Design Research of a Novel Aftercool-Humidifier Concept for Humid Air Turbine Cycle

Journal of Thermal Science 2024年第3期33卷 951-969页

作者： ZHANG Junzheng XU Zhen School of Energy and Power Engineering Shandong UniversityJi’nan250061China Shandong Engineering Laboratory for High-efficiency Energy Conservation and Energy Storage Technology&Equipment Shandong UniversityJi’nan250061China

Humid air turbine cycle(HAT)has potential of electrical efficiencies comparable to combined cycle,with lower investment cost and NO_(x) emission.The typical heat exchanger network of HAT consists of intercooler(if there is),aftercooler,recuperator,economizer and humidifier,which brings higher efficiency but makes the system more complex.To simplify HAT layout,a novel humidifier concept is proposed by integrating the aftercooler into traditional counter-current humidifier.Based on this concept,a one-dimensional model including pressure drop and exergy calculation is established to distinguish the thermodynamic and hydrodynamic characteristics,and then the structural parameters,such as the number of rows and columns,tube diameter,pitch and type for a micro HAT are identified.The results show that the aftercool-humidifier plays the same role as original aftercooler and humidifier,and can match the in-tube air,out-tube air and water stream well with lower volume.In the case of micro HAT cycle,the volume of heat and mass transfer area can be reduced by 47%compared with traditional design.The major thermal resistance occurred in the convection heat transfer process inside the tube;however,using enhanced tube cannot effectively improve the compactness of device.

关键词： humid air turbine cycle humidifier thermodynamic analysis one-dimensional model

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Plasma-Neutral Gas Structure in a Magnesium Cathodic Arc Operating at Oxygen Gas with Experimental Comparison

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Plasma Science and Technology 2013年第11期15卷 1116-1121页

作者：朱道云郑昌喜陈弟虎何振辉 Experiment Teaching Department Guangdong University of Technology State Key Laboratory of Optoelectronic Materials and Technologies School of Physics andEngineering Sun Yat-sen University

The plasma-neutral gas structure generated in a magnesium cathodic arc operated with oxygen gas at a constant current of 50 A has been investigated by employing a simplified one-dimensional fluid model. The model includes elastic collisions and charge-exchange reactions between metallic particles and gas molecules, and also generation and recombination of gaseous ions by electron impact. The distribution profiles of density and velocity of species along the axial direction were obtained at different background gas pressures （in the range of 0.7-3.0 Pa） by this model. A comparison with the experiments was made. At lower gas pressures, the depositing particles were mainly the metallic ions with a larger kinetic energy. As the gas pressure increased, the magnesium atoms with smaller kinetic energy acted as the dominant depositing species. Determined by the minimization of the system＇s total energy, MgO（100） or/and MgO（110） orientation appeared easily in the MgO films at lower gas pressures, and at higher gas pressures, the film preferred orientation was MgO（111）.

关键词： cathodic arc plasma-neutral gas structure one-dimensional model MgO films

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modelling evolution of bed profile and grain size distribution in unsurveyed rivers

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International Journal of Sediment Research 2009年第2期24卷 127-144页

作者： P. RONCO G. FASOLATO G. DiSILVIO Department of Hydraulic Maritime Environmental and Geotechnical EngineeringUniversity of Padua Department of Hydraulic Maritime Environmental & Geotechnical EngineeringUniversity of Padua

The water flow and sediment transport equations have been linearized and analytically solved under the hypothesis of quasi-equilibrium conditions. This solution permits to reconstruct the river bathymetry from planimetric data,the only ones available from satellite images for most of the large rivers of the world. The linearized quasi-equilibrium solution provides a criterion to evaluate the accuracy of the approximate(uniform-flow) model,compared to the regular(steady-flow) model. For non-equilibrium conditions,a further constraint on time resolution should be added,which is however generally satisfied for long-term morphological simulations. The uniform-flow solution presents many advantages which become crucial for long-term numerical computations at watershed scale. The article provides a detailed numerical comparison of the accuracy and resolution of both steadyand uniform-flow models,with an application to the evolution of the lower Zambezi River,which confirms the theoretical criterion. The accuracy of the uniform-flow solution appears to improve when the river is schematized with a coarse computational grid although,of course,with a corresponding loss of spatial resolution.

关键词： Morphological data one-dimensional model Sediment transport Long-term morphodynamics Bathymetric survey Space resolution

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