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  • 1
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    Study of mould design and forming process on advanced polymer-matrix composite complex structure (2015)
    Institute of Physics (IOP)
    Details
    Publication Date: 2015-07-17
    Description: Advanced carbon fibre-reinforced polymer-matrix composites are widely applied to aviation manufacturing field due to their outstanding performance. In this paper, the mould design and forming process of the complex composite structure were discussed in detail using the hat stiffened structure as an example. The key issues of the moulddesign were analyzed, and the corresponding solutions were also presented. The crucial control points of the forming process such as the determination of materials and stacking sequence, the temperature and pressure route of the co-curing process were introduced. In order to guarantee the forming quality of the composite hat stiffened structure, a mathematical model about the aperture of rubber mandrel was introduced. The study presented in this paper may provide some actual references for the design and manufacture of the important complex composite structures.
    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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  • 2
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    Numerical simulation of gas-solid two-phase flow in U-beam separator (2015)
    Institute of Physics (IOP)
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    Publication Date: 2015-01-16
    Description: Numerical simulation is carried out for gas-solid two-phase flow in a U-beam separator. In this study, the U-beam is altered with the inlet fins in order to improve the performance of the separator. The inlet fin angle of the separator are 30°, 35°, 40°, 45°, 50°, 55 ° and 60°. The governing equations are the Reynolds-Averaged Navier-Stokes equation with the standard k- ##IMG## [http://ej.iop.org/icons/Entities/epsilon.gif] {epsilon} model and the discrete phase model (DPM) describing the discrete two - phase flow as well as stochastic tracking model. Results show that the pressure drop deviation with fins is within 3% from those without fins. It is found that there is a maximum separation efficiency at the fin angle of 35°. Fin induces generation of a stagnation region which could collect particles and lead to change of vortical structures. The fin induced flow also causes the turbulent intensity inside the...
    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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  • 3
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    Analysis of vortex flow in a cyclone separators based on the energy gradient theory (2015)
    Institute of Physics (IOP)
    Details
    Publication Date: 2015-01-16
    Description: Numerical simulation is carried out for the tangential inlet cyclone separator with different dimensionless parameter (the ratio of cone-tip diameter and cylinder diameter d/D is 0.342, 0.355, 0.368, 0.382 and 0.395). Then, the stability of the vortex flow in the separator is analyzed with the energy gradient theory. The governing equation is the Reynolds-averaged Navier-Stokes equations with Reynolds Stress Model (RSM). The finite volume method is employed to simulate the flow and the velocity, pressure, separation efficiency and the turbulent intensity are obtained. Results show that the location of the maximum tangential velocity is near the axis, and the highest outer vortex tangential velocity is achieved at the dimensionless rate of 0.355. When the d/D=0.355, the tangential velocity distribution in the outer vortex is the most close to velocity distribution characteristics of free vortex. The free vortex distribution has the best stability from the energy gradient theory w...
    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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  • 4
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    Performance analysis of a novel LCPV/T system (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-10-31
    Description: Low concentration photovoltaic/thermal technology (LCPV/T) can supply both heat and power. Meanwhile, it has the advantage of low cost and less land occupation, therefore, the LCPV/T technology is suitable for integrating with building. In this paper, the outdoor experiment of a LCPV/T system is carried in June 9th, 10th, 14th and 15th. And the system performance was measured. Furthermore, the variation of thermal and electric efficiencies was analyzed. (4) The maximum thermal efficiency of LCPV/T system is 61.55% (100L/h), the maximum electric efficiency is 19.41%.
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 5
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    Precipitation effect on surface salinity and temperature in the Yatsushiro Sea (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-11-06
    Description: Field observation was carried out during July 2016 in Minamata Bay of Yatsushiro Sea, measured data of temperature and salinity of five stations has been used for comparing the numerical simulation based on Princeton Ocean Model (POM). Simulation results showed deviations existed between simulated and measured data, especially the salinity field, which was probably caused by the increased precipitation during plum rain season. Therefore, a new precipitation module and modified heat flux forcing for POM were built to present the rainfall effect of salinity and temperature. It is indicated that the accuracy of predicted temperature and salinity was improved to some extent. In contrast with the previous simulation, deviations were reduced significantly. Nevertheless, simulation results of new model under rainy and sunny conditions showed the cooling impact of precipitation was slight, which may be caused by the daytime observation and solar radiation was dominated. However, this st...
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    Topics: Geography , Geosciences , Physics
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  • 6
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    Analysis of wind environmental characteristics around a square building (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-05-05
    Description: The simulation of the wind environment around a square building is conducted in this paper. Two obvious flow features and their law are presented. When the airflow comes to the building, it separates into four branches, namely up-and-down flows and lateral flows. Firstly, the up-and-down flows are demarcated at 3/4 of the height with varied incoming flow speed. The upward flow reaches maximum speed at the roof and runs over the building, forming vortex in the leeside. The downward flow also achieves the maximum value near the bottom. Secondly, the lateral flows separate symmetrically about the axis and the lateral speed increases from zero along the width direction till the stream reaches the edges of the building and then decreases gradually. The study of the wind flow around a single building plays a basic role in the wind environment research of multi-buildings.
    Print ISSN: 1755-1307
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    Topics: Geography , Geosciences , Physics
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  • 7
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    Experimental investigation on a vacuum still integrated with concentrating PVT hybrid system (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-10-31
    Description: A vacuum still integrated with concentrating photovoltaic/thermal (VSICPVT) hybrid system for desalination is proposed in this paper. This system consists of a vacuum still, a concentrating photovoltaic/thermal (CPVT) module and a solar collector thus can produce freshwater and electricity simultaneously. Its prototype was established in North China Electric Power University (NCEPU), Beijing, China. In order to study the performance of this hybrid system with different inlet temperature of the vacuum still but with constant flow rate of saline water in the CPVT module, the experiments were conducted. And the electric efficiency, power, vaporization rate and freshwater yield of the system were analyzed.
    Print ISSN: 1755-1307
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    Topics: Geography , Geosciences , Physics
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  • 8
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    Experimental research on the aeration length of Tidal Bore Front (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-11-06
    Description: In the estuary zone, tidal bore front with strong aeration has a great impact on the navigation, the transportation of sediment, the diffusion of pollutant and the growth of many species of wildlife, but scarcely any studies have interested in the aeration of tidal bore front. New experiments were accomplished in a horizontal glass flume with generated tidal bore. The form of tidal bore front was observed by a high-speed camera, the aeration process and aeration form of tidal bore were recorded and presented herein. Meanwhile, the relationship among the intensity of tidal bore, the Froude number of tidal bore and the relative aeration length of tide bore is analyzed and discussed by measuring the height, mean propagation velocity and the aeration length of tide bore front. An experimental formula is obtained to calculate the aeration length of tide bore by nonlinear regression analysis, which could have practical implications for represent and indirectly quantify the tidal bore ...
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  • 9
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    Experimental study on the wave dissipation performance and mooring force of porous floating breakwater (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-11-07
    Description: Through the physical model test method, the wave dissipation performance and mooring force of porous floating breakwater under regular waves are analyzed and compared with the traditional pontoon floating breakwater. The results show that for long waves with small wave height in the tests, the transmission coefficient of porous floating breakwater is 0.5%∼4% smaller than traditional floating breakwater. The porous floating breakwater cannot achieve effective wave dissipation under most conditions mainly because of the small height out of the water. The mooring force of porous floating breakwater can be reduced 3%∼5.5% with splayed mooring system. The research content in this paper provides a theoretical basis for the design and engineering application of porous floating breakwater.
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  • 10
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    Numerical study on the wave force of the metal net under regular waves (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-11-07
    Description: In this paper, the simulation of the forces on mental net is studied under regular wave. The FEM (Finite Element Method) and the Morison Equation are used in simulating the netting structure and the wave force respectively. Based on the Newmark method in Abaqus, verified by the comparison between the simulation and experimental results, the wave forces under different wave conditions, mesh size and net thread diameter are calculated and analyzed which will afford a reliable foundation for the following research on the metal net cage.
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    Topics: Geography , Geosciences , Physics
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