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Chen J.,Xi'an Jiaotong University | Wang Y.,Xi'an Jiaotong University | Li X.,Xi'an Jiaotong University | Li X.,China Special Equipment Inspection And Research Institute | And 4 more authors.
Powder Technology | Year: 2015

A CFD-DEM-based liquid-particle two-phase flow erosion prediction model occurring over such pipeline connection as elbows, which takes the interaction of liquid-particle, particle-particle and particle-wall into account, is proposed in this study. The standard k - ε model is adopted for fluid turbulent flow, the standard wall functions for near-wall zone treatment, and the Hertz-Mindlin (no slip) model for particle-particle and particle-wall contact. Numerical simulations have been performed by combining CFD code ANSYS FLUENT with DEM code EDEM to predict the maximum erosion rate and location in 90°, 60° and 45° elbows with diameter 40mm. The fluid is water with inlet velocity 3m/s, and the particles are 150μm in diameter and 2650kg/m3 in density. While the maximum erosion rates of the three are found to be quite different, the maximum erosive locations have been indicated to be at or near the exit of the elbows. In addition, the effect of bend-angle on erosion, particle motion and flow field has been discussed. © 2015 Elsevier B.V.


Wang R.,Ningbo University | Wang R.,Third Institute of Oceanography | Ren C.,China Shipbuilding Industry Corporation CSIC | Huang N.,China Shipbuilding Industry Corporation CSIC | And 2 more authors.
Marine Genomics | Year: 2015

Pseudomonas oleovorans MGY01 isolated from the deep-sea water of the South China Sea could effectively degrade malachite green. The draft genome of P. oleovorans MGY01 was sequenced and analyzed to gain insights into its efficient metabolic pathway for degrading malachite green. The data obtained revealed 109 Contigs (N50; 128,269bp) with whole genome size of 5,201,892bp. The draft genome sequence of strain MGY01 will be helpful in studying the genetic pathways involved in the degradation of malachite green. © 2014 Elsevier B.V.


Zhang J.,Northwestern Polytechnical University | Chu W.,Northwestern Polytechnical University | Zhang H.,Northwestern Polytechnical University | Wu Y.,Northwestern Polytechnical University | Dong X.,China Shipbuilding Industry Corporation CSIC
Applied Acoustics | Year: 2016

A numerical study of the aerodynamic and aeroacoustic behaviors of a backward curved blade centrifugal fan was conducted under two important flow conditions: BEP and 1.3 × BEP. Three-dimensional numerical simulations of the complete unsteady flow field for the whole impeller-volute configuration were used to determine the aeroacoustic sources. To locate the unsteady flow and perturbations, the near field wall pressure fluctuations at different strategic points on the volute were computed using the URANS approach. Thus the intensities and positions of the aeroacoustic sources were identified by analyzing frequency spectra. The aeroacoustic sources caused by fluctuations in the interactions of the flows leaving the impeller and volute were close to the volute tongue, and the most effective noise sources related to the flow rate were near the impeller shrouds. In addition, the unsteady flow variables provided by CFD calculations were used as inputs in the Ffowcs Williams-Hawkings equation to estimate the noise tones of the fan. The aeroacoustic calculation results showed that the volute noise was much larger than the blade noise, and the noise mainly propagated from the outlet duct of the fan. Moreover, to account for the noise propagation, three calculation methods were used by applying different solid boundaries. Compared with the other methods, the FEM method, which accounted for the complex solid boundaries, produced good agreement and showed that the complex solid boundaries cannot be neglected in aeroacoustic predictions. The calculation results showed good agreement with the experimental results. © 2016 Elsevier Ltd. All rights reserved.


Li T.X.,Shanghai JiaoTong University | Wang R.Z.,Shanghai JiaoTong University | Li H.,China Shipbuilding Industry Corporation CSIC
Progress in Energy and Combustion Science | Year: 2014

Heat-powered solid-gas sorption refrigeration technology has been regarded as one of the effective methods for reutilization of low-grade thermal energy such as industrial waste heat, renewable energy, and exhaust gases from engines. A number of advanced solid sorption refrigeration systems have been developed to improve energy efficiency by reducing the primary energy consumption as the recognition of energy saving. These advanced solid sorption refrigeration cycles mainly include heat recovery sorption cycle, mass recovery sorption cycle, mass and heat recovery sorption cycle, double/multi-effect sorption cycle, combined double-way sorption cycle, double-effect and double-way sorption cycle, two/multi-stage sorption cycle, etc. In this paper, the progress in the development of solid-gas sorption refrigeration thermodynamic cycle is reviewed. The operating principles of these advanced solid-gas sorption refrigeration cycles are introduced in detail, and the representative working performances of different sorption refrigeration cycles are presented and compared. Moreover, the key problems of advanced sorption refrigeration cycles are described and discussed. Finally, the future development of solid-gas sorption refrigeration cycle is also proposed. © 2013 Elsevier Ltd. All rights reserved.


Yan T.,Shanghai JiaoTong University | Li T.X.,Shanghai JiaoTong University | Li H.,China Shipbuilding Industry Corporation CSIC | Wang R.Z.,Shanghai JiaoTong University
International Journal of Refrigeration | Year: 2014

A new composite sorbent made of CaCl2 and multi-walled carbon nanotube (MWCNT) was prepared for solid-gas ammonia adsorption refrigeration systems in the paper. The composite sorbent was fabricated by impregnating MWCNTs matrix with CaCl2 to improve the adsorption performance of the chemical sorbent. The ammonia adsorption capacity of the composite sorbent and the MWCNTs matrix were measured using a Rubotherm magnetic suspension balance. Experimental results showed that the maximum adsorption amount of ammonia by the MWCNTs matrix and the composite sorbent are 90.05 mg gCNT-1 and 859.85 mg gsorbent-1 under the experimental conditions. Moreover, the chemical reaction plateaus and steps of the reaction between CaCl2 and NH3 were analyzed and the adsorption capacities of the composite sorbent at different working conditions were evaluated. The results indicated that although the adsorption capacity of ammonia on the pure MWCNTs is relatively low, the addition of MWCNTs into the chemical sorbent can avoid the agglomeration and prevent the adsorption performance attenuation of reactive salt. ©2014 Elsevier Ltd. All rights reserved.


Yan T.,Shanghai JiaoTong University | Wang R.-Z.,Shanghai JiaoTong University | Li H.,China Shipbuilding Industry Corporation CSIC | Ma L.,Shanghai JiaoTong University | Li T.-X.,Shanghai JiaoTong University
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2014

A novel sorption heat transformer is introduced for the integrated energy storage and energy upgrade of low-grade thermal energy on the basis of the pressure-reducing desorption technique and temperature-lift adsorption technology. The experimental research was carried out by employing the MnCl2-NaBr-NH3 as the working pair. When the temperature of driving heat source is 121℃ and heated end user simulated is 150℃, the corresponding energy storage efficiency is 0.302 with the ambient temperature of 15℃ and the evaporating temperature of 55℃. The research results showed that the thermochemical composite sorption energy storage technology can effectively achieve the thermal energy upgrade and provide the required heat for the heat consumer. It can be used to store the thermal energy and lift the energy quality of low-grade thermal energy. It is feasible and provides a new idea for the comprehensive utilization of low-grade thermal energy.


Luo A.,Hunan University | Ma F.,Hunan University | Xiong Q.,China Shipbuilding Industry Corporation CSIC | He Z.,Hunan University
Journal of Power Electronics | Year: 2015

A 6.5 V/50 kA high-frequency switching power supply (HSPS) system composed of 10 power modules is developed to meet the requirements of copper-foil electrolysis. The power module is composed of a two-leg pulse width modulation (PWM) rectifier and a DC/DC converter. The DC/DC converter adopts two full-wave rectifiers in parallel to enhance the output. For the two-leg PWM rectifier, the ripple of the DC-link voltage is derived. A composite control method with a ripple filter is then proposed to effectively improve the performance of the rectifier. To meet the process demand of copper-foil electrolysis, the virtual impedance-based current-sharing control method with load current full feedforward is proposed for n-parallel DC/DC converters. The roles of load current feedforward and virtual impedance are analyzed, and the current-sharing control model of the HSPS system is derived. Virtual impedance is used to adjust the current-sharing impedance without changing the equivalent output impedance, which can effectively reduce current-sharing errors. Finally, simulation and experimental results verify the structure and control method. © 2015 KIPE.


Huang J.,China Shipbuilding Industry Corporation CSIC | Fang H.,China Shipbuilding Industry Corporation CSIC | Liu Y.,China Shipbuilding Industry Corporation CSIC | Pan R.,China Shipbuilding Industry Corporation CSIC
Proceedings - IEEE 2011 10th International Conference on Electronic Measurement and Instruments, ICEMI 2011 | Year: 2011

The article introduces traditional fixed-frequency multicoupler and its defects through analysis over strong points of frequency-hopping communication and antenna-sharing communication, which presents the advantages of frequency-hopping Multicoupler in a distinctive manner. A proposal focused on frequency-hopping operation for Multicoupler has been in this article designed and put forward, which can be divided into such main units as control unit, filter group, drive circuit of switch matrix, and filter tandem network. The proposal is proved to meet the requirements for Multicoupler to track high-speed frequency-hopping of radios, and to boast such advantages as rapid tandem for cavity filters, high reliability, and compact size needed for the equipment. © 2011 IEEE.

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