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Inlet convergence angle is an important dimensional parameter that affects the pump efficiency. In this study, numerical investigation is conducted on the flow field inside the jet pump to clarify the effect of inlet convergence angles on pump efficiency and suction performance. The simulated results show that the pump efficiency and suction performance decreases gradually with the increment in inlet...
Numerical simulation of unsteady three-dimensional turbulent flow in a mixed flow reactor coolant pump was achieved by using a phased-lagged method. Based on Reynolds averaged Navier-Stokes equations with S-A turbulence models in commercial software Numeca, pressure distribution in impeller, diffuser and volute was obtained, and focused on pressure fluctuations caused by impeller-diffuser interaction...
In model based selective catalytic reduction (SCR) control, because of the nonlinearities and immeasurable properties of the SCR physical background, model parameterization is always a problem to be solved. In this paper, a new method based on the nonlinear least square method is developed to estimate the parameters in a SCR model. The SCR system state functions are specially designed in terms of...
Recently wind energy has developed at a fast pace, and it is necessary to develop equivalent models to represent dynamic behaviors of wind farms on power system. This paper investigates the applications of the equivalent wind method for the aggregation of DFIG wind turbines. Simulations in a practical power system have been used to verify the effectiveness of the aggregation.
Liquefied Natural Gas (LNG) is being developed as a transportation fuel for transit buses, to lessen the dependency on oil and to reduce greenhouse gas emissions. But LNG is hazardous because of its temperature, the possibility of asphyxiation and of course the fire risk. This paper describes the use of Fluent, a widely-used commercial CFD code, to simulate the dynamics of spills from LNG bus fuel...
Pedestrian traffic system is a stochastic dynamic system with uncertainty cluster density, non-linear and the interaction among the individuals. Now computer dynamic simulation is one of the effective methods to study the mechanical characteristics of pedestrian flow in the public buildings. Aimed at the problems that under the same scene different software tools used in pedestrian simulation may...
Propose the technical program of line loss calculation based on GIS. Using network topology analysis and integrated management of space attribute data, access to calculate the required load data. This method can automatically adapt to the changes of distribution network's structure.
If a linear turbine cascade experimental apparatus uses only few cascade model, it has several advantages in experiment, such as increasing the accuracy of experimental result by applying bigger turbine cascade model on the same apparatus without increasing compressor power, and easy access of optical devices within the cascade passage. However, it is difficult to make the same periodic flow conditions...
Study and analysis the fuel leakage security of current LNG alternative fuel bus. Do the simulation on surrounding concentration and temperature of LNG bus fuel tank leakage by Computational Fluid Dynamics (CFD). By analyzing the influence of three different bus velocities, 0km/h, 30km/h and 80km/h, we have the conclusion from the simulation that when the bus gets faster, the influence of surrounding...
The three-dimensional turbulent flow in a supercritical pump with complex double-cases based on the integral model combined with the pass-by pipes is computed and simulated by means of a parallel computer and the software FLUENT using the mathematical models (Navier-Stokes equations, RNG k-ε turbulence model and boundary conditions) in Computational Fluid Dynamics (CFD), which aims at improving the...
Large eddy simulation cooperated with a physical fractional-step method was applied to simulate steady flows near a groin in a straight open channel. Comparisons with experimental and other model results indicate that the present model is capable of simulating turbulent flow in an open channel. The simulated results by the proposed model agree well with the experimental data. The research shows that...
Pressure and temperature's accurate calculation of the oil-gas multiphase transportation pipeline is the key of the process calculation study, and it has important significance to the production run of pipeline. According to the needs of the engineering application, and based on the data of actual pipeline, this paper amends the key parameters of the pressure drop and temperature drop models, and...
The monitoring system of the dam is introduced. To different dams and monitoring points at different locations of dams, because their geographical environment and geological environment are different, their deformation discipline is different, we can preplace some deformation models, and let the computer look for the deformation model whose forecast error is least. In order to improve the fitted accuracy...
In this paper an overview of the coupling methodologies between reactor physics (Neutronics) and thermal hydraulic have been studied by taken into account the previous and ongoing research. The current study includes the neutronics and thermal hydraulic model and the coupling methodology between the two phenomenons which is inter related with computational approach. Since the coupling involves some...
In order to realize functions of teaching training and research for Steam Power Plants (SPP) simulator, the paper designed and implemented the Monitor & Control System (MCS) of the SPP simulator, and its implement based on a new type of software-GL Studio. The paper also introduced the virtual MCS technology based on GL Studio and the real-time communication between simulation models and the virtual...
Intelligent network is an important mean to achieve energy saving and promote renewable energy develop. With the technology of power electronics, IT, communications continuing to evolve, the smart grid will be an important direction of the electric power industry development. With the construction process of it, the reliability is paid more and more attention. The reliability method and key technology...
This paper proposes a composite load model with dynamic compensation. Based on the measurements obtained from Yunxiu Substation in Chengdu, China, a nonlinear identification is performed to get the parameters of the composite load model with dynamic compensation. Simulation results show that the proposed model has a very good fitting in both transient and steady periods. In addition, two static load...
Numerical simulation of unsteady turbulent flow for a rectangular impinging jet is carried out in this paper. The Nusselt number at stagnation point increases as nozzle to plate distance (H/D) increases until H/D=8. This may be caused by nonlinear dynamic effects in momentum and energy transport within the boundary layers. The flow and temperature fields in one period have been compared. The temperature...
A new method to estimate the battery state of charge (SOC) in electric vehicles (EV) based on support vector machine is presented. The key of the proposed method is to establish the relationship of the SOC to the battery current, voltage and temperature by using weighted least squares support vector machine (WLS-SVM). With the goal of achieving the optimal robust estimation of the SOC, the extended...
A three-dimensional Euler-Lagrange model was used to study the distribution of particles in scrubbing-cooling chamber of coal-water-slurry (CWS) entrained-flow gasifier. Comparisons of computational results with experimental data are made. The effects of operating conditions and size grading on the particle number density distribution in chamber is revealed through simulation. The results indicate...
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