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2010年04月30日

【期刊论文】Numerical study of self-adaptive vibration suppression for flexible structure using interior inlay viscous fluid unit method

李军, Xiongwen Zhang a, Jun Li a, Hui Xu b, Guojun Li a, *

Journal of Sound and Vibration 297 (2006) 627-634,-0001,():

-1年11月30日

摘要

This paper investigates the usage of an interior inlay viscous fluid unit as a new vibration suppression method for flexible structures via numerical simulations. The first and second modes of vibration for a beam have been calculated using the commercial computational fluid dynamic package Fluent6.1, together with the liquid surface distribution and the fluid force. The calculated results show that the inlay fluid unit has suppressive effects on flexible structures. The liquid converges self-adaptively to locations of larger vibrations. The fluid force varies with the beam vibration at a phase difference of more than 1801. Thus the fluid force suppresses the beam vibration at most of the time.

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2010年04月30日

【期刊论文】Development of a control-oriented model for the solid oxide fuel cell

李军, Xiongwen Zhang, Jun Li, Guojun Li*, Zhenping Feng

Journal of Power Sources 160 (2006) 258-267,-0001,():

-1年11月30日

摘要

A lumped, non-linear control-oriented dynamic model for the solid oxide fuel cell has been developed. The exponential decay function and the exponential associate function are introduced to fit the distribution characteristics of fuel cell state variables in the flow direction of the gases in order to account for the effect of spatial variation of fuel cell parameters in the dynamic model. It is integrated into the dynamic model by three characteristic parameters of the fitting function, which are determined via numerical simulations. A planar solid oxide fuel cell with co-flow has been used to evaluate the accuracy and applicability of the current dynamic model. The dynamic model is programmed and implemented using the SIMULINK software. The simulation results indicate the model has good service quality to predict the state variables and the performance of the solid oxide fuel cell.

Solid oxide fuel cell, Control-oriented dynamic model, Fitting functions

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2010年04月30日

【期刊论文】Dynamic modeling of a hybrid system of the solid oxide fuel cell and recuperative gas turbine

李军, Xiongwen Zhang, Jun Li, Guojun Li*, Zhenping Feng

Journal of Power Sources 163 (2006) 523-531,-0001,():

-1年11月30日

摘要

The hybrid solid oxide fuel cell (SOFC) and gas turbine (GT) system is a promising concept in the future power generation for its highperformance and low-emission. The dynamic model for the hybrid system of integrated SOFC and recuperative GT with air reheating component is presented in this work. A dynamic model was put forward based on the conservation equations of mass, energy and force through the whole plant, with specific source terms in different types of components. The SOFC was modeled on the basis of the Exponential Decay function and the Exponential Associate function, which describe the characteristics of the parameters distribution within the SOFC. A cubic curve was employed to denote the compressor pressure characteristics. In the turbine model, the relation between the work done and the inlet condition of turbine was determined according to the turbine nozzle work characteristics. The developed system model was programmed and implemented in the simulation tool Aspen Custom Modeler. The current density of SOFC was selected as disturbance variable during the dynamic simulation using the developed dynamic model. The responses of the SOFC air inlet temperature, SOFC outlet temperature, and turbine inlet temperature, the output voltage, and the gas species molar fractions at the outlet of SOFC were presented. The obtained results show that the presented dynamic model can be able to simulate the system dynamic track reasonably.

Solid oxide fuel cell, Hybrid system, Dynamic model

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2010年04月30日

【期刊论文】Cycle analysis of an integrated solid oxide fuel cell and recuperative gas turbine with an air reheating system

李军, Xiongwen Zhang, Jun Li, Guojun Li*, Zhenping Feng

Journal of Power Sources 164 (2007) 752-760,-0001,():

-1年11月30日

摘要

Cycle simulation and analysis for two kinds of SOFC/GT hybrid systems were conducted with the help of the simulation tool: Aspen Custom Modeler. Two cycle schemes of recuperative heat exchanger (RHE) and exhaust gas recirculated (EGR) were described according to the air reheating method. The system performance with operating pressure, turbine inlet temperature and fuel cell load were studied based on the simulation results. Then the effects of oxygen utilization, fuel utilization, operating temperature and efficiencies of the gas turbine components on the system performance of the RHE cycle and the EGR cycle were discussed in detail. Simulation results indicated that the system optimum efficiency for the EGR air reheating cycle scheme was higher than that of the RHE cycle system. A higher pressure ratio would be available for the EGR cycle system in comparison with the RHE cycle. It was found that increasing fuel utilization or oxygen utilization would decrease fuel cell efficiency but improve the system efficiency for both of the RHE and EGR cycles. The efficiency of the RHE cycle hybrid system decreased as the fuel cell air inlet temperature increased. However, the system efficiency of EGR cycle increased with fuel cell air inlet temperature. The effect of turbine efficiency on the system efficiency was more obvious than the effect of the compressor and recuperator efficiencies among the gas turbine components. It was also indicated that improving the gas turbine component efficiencies for the RHE cycle increased system efficiency higher than that for the EGR cycle.

Solid oxide fuel cell, Cycle analysis, Recuperative heat exchanger, Exhaust gas recirculation