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  • 1
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    Numerical study on the influence of high altitude environment on hydraulic mechanical performance (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-07-31
    Description: Due to the difference of performance between high altitude power station and low altitude power station, environmental factors should not be neglected in the design process of turbine in high altitude area. In order to study the influence of environmental factors on the performance of hydraulic turbine. In this paper, Francis turbine in high altitude area is taken as the object of study, numerical study in considering the variation of pressure and temperature under the condition of different working condition on the performance of the turbine, and the turbine performance without considering the environmental factors were compared, when the altitude changes, the energy characteristics, cavitation performance and the flow pattern of the unit in accordance with different environmental factors are analyzed in order to reveal the influence of altitude factors on the overall performance of the turbine. The results show that when the water temperature drops, the efficiency of the unit ...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
    Published by Institute of Physics (IOP)
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  • 2
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    Assessment of injury and mortality from rapid decompression on crucian carps (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-07-31
    Description: Knowledge of barotrauma injury mechanisms is required in the fish-friendly turbine design. Rapid decreases in pressure is one of the main reasons that cause injury and mortality to fish that pass through hydropower machines. A steel tank and related pressure regulation components were designed to study the barotrauma injury thresholds of crucian carps. Decompression from 700 kPa to 6 kPa in 0.3 s was implemented in this system with dozens of yearling and subyearling crucian carps. The fish swim bladder and other organs were observed to find the main reason for injury after the rapid decompression. The tested fish were kept for at least 48 hours to study the physiological status in different observation periods. The direct and indirect decompression induced mortality after the test was observed and analyzed.
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 3
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    Physico-empirical methods for estimating soil water characteristic curve under different particle size (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-11-06
    Description: Soil water characteristic curve (SWCC) is an important property of soil, but directly measuring methods are costly and time-consuming. Many attempts have been made to predict the water characteristic curve indirectly from soil particle size distribution (PSD) and basic physical properties. In this study, the Arya-Paris (A-P) model and Non-similar midia concept (NSMC) model were applied to predict the SWCC indirectly with six soil samples in arid regions. The objective of this study was to compare the two physico-empirical methods and assess the applicability of them under different particle size of soil. The results showed that the A-P model was superior to NSMC model on prediction precision, and more suited to predict silty sand and silt, those soils with medium texture. While using Arya-Paris method, the scaling parameter, α (parameter used to scale pore lengths based on spherical particles to natural soil pore lengths), was estimated by non-linear fitting, linear fitting and ...
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    Topics: Geography , Geosciences , Physics
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  • 4
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    Effects of hot-rolling reduction on microstructure, texture and magnetic properties of high silicon steel produced by strip casting (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-02-14
    Description: Non-oriented Fe-7.1wt.% Si as-cast strips were produced by twin-roll strip casting process. Then the as-cast strips were hot rolled with different reductions, followed by warm rolling and final annealing. The microstructure, texture evolution and magnetic properties were investigated in detail. The texture of hot rolled sheets with 40% reduction showed strongest {001} texture, whereas the dominated texture was turned into {110} and {110} as the reduction was increased to 56% and 68%. After warm rolling and annealing, the average grain size was decreased firstly and then increased with an increase in hot rolling reduction. In the case of 40% hot rolling reduction, the recrystallization texture was dominated by strong γ ( //ND) texture. With an increase in hot rolling reduction, the γ texture was gradually weakened while α ( //RD) texture was enhanced. In addition, relatively stronger {100} texture was presented in the sheet of 6...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 5
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    Dynamic analysis of the reciprocating compressor package on the offshore platform (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-09-07
    Description: Reciprocating compressor packages are key equipment for the offshore platforms which are used for the pressurization and transportation of natural gas. Dynamic analyses of high-speed and flexible supported offshore compressor packages are more complex than that of compressors on land. The dynamic analysis techniques of the offshore reciprocating compressor package were studied including numerical modelling, excitation forces calculation, support boundary determination of the compressor package and load transmission between the compressor package and the offshore platform. The finite element model of the compressor package with multiple types of elements such as the pipe, beam and shell elements were established. Excitation forces mainly including gas forces inside cylinders, crosshead forces, acoustic shaking forces and unbalanced inertia forces were calculated. In order to investigate the influence of the flexibility of the platform on dynamic characteristics of the compressor ...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 6
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    Effective Identification on Adulteration of Polyethylene With Post-consumer Ones (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-05-17
    Description: This paper mainly describes the effective identification of the adulteration of polyethylene with post-consumer ones. Degradation would be happened when multiple processings occurred. The melt flow index (MFI) analysis, thermal gravimetric analysis (TGA), differential scanning calorimeter (DSC) were used to characterize the processability and thermal stabilities of virgin polyethylene and recycled polyethylene which adulterated post-consumer PE. The results indicated that MFI of PE increased with the increasing doping content. Adulterating reclaimed PE had effects on the thermal stability of PE, which led to lower thermal decomposition temperature. Melting peak of recycled LLDPE varied from merely single to double, which differently compared differently with virgin LLDPE. Besides, with the doping content of post-consumer LDPE, the melting temperature had a decreasing tendency.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 7
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    Active and Reactive Power Optimal Dispatch Associated with Load and DG Uncertainties in Active Distribution Network (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-05-20
    Description: In order to reduce the adverse effects of uncertainty on optimal dispatch in active distribution network, an optimal dispatch model based on chance-constrained programming is proposed in this paper. In this model, the active and reactive power of DG can be dispatched at the aim of reducing the operating cost. The effect of operation strategy on the cost can be reflected in the objective which contains the cost of network loss, DG curtailment, DG reactive power ancillary service, and power quality compensation. At the same time, the probabilistic constraints can reflect the operation risk degree. Then the optimal dispatch model is simplified as a series of single stage model which can avoid large variable dimension and improve the convergence speed. And the single stage model is solved using a combination of particle swarm optimization (PSO) and point estimate method (PEM). Finally, the proposed optimal dispatch model and method is verified by the IEEE33 test system.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 8
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    Phosphorus Sorption Capacities of Steel Slag in Pilot-Scale Constructed Wetlands for Treating Urban Runoff: Saturation Potential and Longevity (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-02-05
    Description: Two parallel pilot-scale integrated constructed wetland (ICW) systems were constructed on the bank of Nanfeihe River. The phosphate (PO 4 3- ) isothermal adsorption properties of the upper substrate steel furnace slag (SFS) in up-flow chamber was investigated during one-year operation period. The maximum phosphorus (P) adsorption capacity of SFS 9, 11, 13, 15, 17, 19 months service time were 848.9 mg/kg, 968.1 mg/kg, 824.5 mg/kg, 788.7 mg/kg, 864.7 mg/kg and 960.3 mg/kg, respectively. The saturated adsorption amount of SFS had not decreased with the service time prolonging in ICW. The longevity of a full-scale system could not be reliably estimated only based on the theoretical saturated adsorption capacity from laboratory experiments.
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 9
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    Research on the water hammer protection of the long distance water supply project with the combined action of the air vessel and over-pressure relief valve (2013)
    Institute of Physics (IOP)
    Details
    Publication Date: 2013-12-22
    Description: We take a concrete pumping station as an example in this paper. Through the calculation of water hammer protection with a specific pumping station water supply project, and the analysis of the principle, mathematical models and boundary conditions of air vessel and over-pressure relief valve we show that the air vessel can protect the water conveyance system and reduce the transient pressure damage due to various causes. Over-pressure relief valve can effectively reduce the water hammer because the water column re-bridge suddenly stops the pump and prevents pipeline burst. The paper indicates that the combination set of air vessel and over-pressure relief valve can greatly reduce the quantity of the air valve and can eliminate the water hammer phenomenon in the pipeline system due to the vaporization and water column separation and re-bridge. The conclusion could provide a reference for the water hammer protection of long-distance water supply system.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 10
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    Study on bamboo gluing performance numerical simulation (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-02-03
    Description: Bamboo gluing timber is a green building materials, can be widely used as modern building beams and columns. The existing bamboo gluing timber is usually produced by bamboo columns or bamboo bundle rolled into by bamboo columns. The performance of new bamboo gluing timber is decided by bamboo adhesion character. Based on this, the cohesive damage model of bamboo gluing is created, experiment results are used to validate the model. The model proposed in the work is agreed on the experimental results. Different bamboo bonding length and bamboo gluing performance is analysed. The model is helpful to bamboo integrated timber application.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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