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Investigation on hydrodynamic performance of a marine propeller in oblique flow by RANS computations
Yao, Jianxi The Society of Naval Architects of Korea 2015 International Journal of Naval Architecture and Oc Vol.7 No.1
This paper presents a numerical study on investigating on hydrodynamic characteristics of a marine propeller in oblique flow. The study is achieved by RANS simulations on an open source platform - OpenFOAM. A sliding grid approach is applied to compute the rotating motion of the propeller. Total force and moment acting on blades, as well as average force distributions in one revolution on propeller disk, are obtained for 70 cases of combinations of advance ratios and oblique angles. The computed results are compared with available experimental data and discussed.
Investigation on hydrodynamic performance of a marine propeller in oblique flow by RANS computations
Jianxi Yao 대한조선학회 2015 International Journal of Naval Architecture and Oc Vol.7 No.1
This paper presents a numerical study on investigating on hydrodynamic characteristics of a marine propeller in oblique flow. The study is achieved by RANS simulations on an open source platform - OpenFOAM. A sliding grid approach is applied to compute the rotating motion of the propeller. Total force and moment acting on blades, as well as average force distributions in one revolution on propeller disk, are obtained for 70 cases of combinations of advance ratios and oblique angles. The computed results are compared with available experimental data and discussed.
WANGPING RAO,JIANXI YAO,SONGYUAN DAI,BING ZHANG,YONGZHE ZHANG,LI XIAO 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.5
We demonstrate a strategy for incorporating plasmon resonant metallic nanoparticles in theconstruction of the three-dimensional (3D) interwoven structured TiO 2 photoanodes. The 3Dinterwoven structure contained continuous TiO 2 skeleton and numerous interconnected macro/mesopores, which supplied e®ective straight path for electron transfer and high speci¯c surfacearea for dye load. Localized surface plasmon resonance (SPR) was produced by the addition ofgold nanoparticles (AuNPs), which increased the light absorption of the photoanodes moree®ectively. The synergistic e®ect of SPR with constructed TiO 2 nanostructures has been in-vestigated, and was con¯rmed by ¯eld-emission scanning electron microscope (FESEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy(XPS), UV-Vis absorption spectra, J – V characteristics, and electrochemical impedance spec-troscopy (EIS) analysis. It was found that the range and strength of light absorption of TiO 2photoanodes, the photon capture ability of the dye molecules, the photoelectric conversion e±-ciency were signi¯cantly increased while the electron transfer resistance decreased due to theincorporation of AuNPs compared to the P25 and Au-free photoanode. The related photoelectricperformance enhancement mechanisms, and surface-plasmon resonances in dye-sensitized solarcells (DSSCs) with Au nanostructures were analyzed and discussed.
YONG DING,SONGYUAN DAI,Litao Jia,YANMEI MA,ZHAOQIAN LI,CHANGNENG ZHANG,JIANXI YAO,LIE MO,LINHUA HU,BING ZHANG,LING JIANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.5
The sub-microspheres play multiple roles in enhancing dye adsorption and light-scattering toimprove the performance of dye-sensitized solar cells (DSSCs). In this work, the well-de¯ned TiO 2sub-microspheres with anatase granular-like nanocrystals are prepared in high yield by com-bining hydrolytic process with solvothermal treatment. Scanning electron microscopy (SEM) andtransmission electron microscopy (TEM) results indicated that plenty of rhombic nanoparticleswith ? 18 nm diameter having mutual contacts to neighboring nanoparticles were densely self-assembled into sub-microspheres, and abundant mesopores existed in the whole sub-microsphereswith superior light scattering ability. The appropriate pore diameter and relatively high speci¯csurface area of the as-obtained sub-microsphere result in a higher dye adsorption. As expected, byusing the sub-microspheres as a scattering layer, a higher photovoltaic conversion e±ciency of10.15% is obtained for DSSCs.