Advanced Materials Research Vols. 317-319

Abstract: For the purpose of increasing applicability of combustion chamber simulation, computational domain, boundary condition, simplicity of complicated structures, mesh generation and physical parameters are investigated in this paper. An annular combustion chamber of some aero-engine is studied by means of predictive numerical simulation. The computational domain includes diffuser, swirler, inner flame tube, inner ring of combustion chamber and the flow channel of all the holes on the wall of flame tube. The film cooling holes row was simplified into a slit filled with porous media. Realizable k-turbulent model and non-premixed combustion model were adopted. Model of pressure atomization nozzle were calibrated and validated through inner nozzle flow property two-phase flow VOF model and experimental data. Physical parameters are express through polynomial functions. A commercial CFD code was adopted on a high performance computing cluster with parallel algorithm and the solving method are high-order discretization scheme. The velocity, pressure, temperature, fuel spray, density of fuel and productions, etc. are calculated and validated with the experimental data.

Abstract: Abstract. Civic critical infrastructure systems have become an inter-connected networked system due to the all kinds of interdependencies. Under the circumstance of emergent events, disruption or failure of one system may lead to the cascading effect on other interdependent systems. We develop a mathematic model based on supply and demand relation of multi-network systems considering the coupling characteristic of critical infrastructures when emergent events happen. The model can offer the emergency strategy to the urgent accident by analyzing events chain after single node fails. The numerical results indicate the approach taken in this research can break through the limit of conventional emergency strategy within single system of dispatching standby products as inventory and to better optimize the total loss of the whole networked system.

Abstract: Emergency management is becoming more and more important with the vulnerability increasing in global supply chain. An effective policy which is emergency strategy stock based for perishable supply chain emergency scheduling with a failed produce node has been proposed. Mixed integer programming model was build under the inventory policy of perishable products which include both of raw materials and finished products. The simulation results show that our policy of the model is effective, and could solve these problems completely.

Abstract: A car engine-thermoelectric source system is constructed. The simulation procedure of the system shows in the following. With the using of AVL-BOOST software, the Operating condition of this system is simulated according to the structure of the engine and the temperature, velocity, pressure of the exhaust are obtained, which are used as the initial conditions of the thermal power. The geometry and mathematical model of thermoelectric generator is established and numerical calculation is done with the Star-CD software. This paper focuses on a type of four-stroke gasoline engine-intramural thermoelectric system and gives a calculation instance of the generator’s components.

Abstract: Based on two different mixing systems: Rotary Jet Mixing (RJM) system and side-entering agitator, two kinds of three-dimensional gasoline components mixing models are established. The incompressible Reynolds equation is selected as the momentum equation and the algorithm of SIMPLE is used to simulate the jet facility. To get the mixing time, moving mesh and the standard k-ε turbulent model has been employed in the multiphase unsteady flow. The results show that the dead areas of RJM are less than side-entering agitator, and the mixing effects are much better. Furthermore, the mixing time of RJM is only 58.2s, which is 69.7% of Side-entering Agitator.

Abstract: Designing the pneumatic DTH by the method of anology, experience and actual test, the investment is large, the cycle is long, and it is difficult to achieve the optimization. In order to research profoundly the DTH work mechanism and describe piston movement laws in detail, physical model is established according to the actual conditions, finite difference method is adopted, thermodynamics and kinematics are applied. Using object-oriented programming, the pneumatic DTH computerized simulation software is developed whose integrated development environment is VB. The software can calculate acceleration, velocity, displacement, pressure, temperature of the front and back air chamber at any time and the operating performance parameters of the pneumatic DTH. The law of many factors influencing on the pneumatic DTH performance can be found and the optimization of the pneumatic DTH structure parameter can be achieved by the ergodic method. Not only the pneumatic DTH but also the no-dig impactor is designed by computerized simulation.

Abstract: With the development of the living standard of the people, modern people like to be in pursuit of individualized articles for daily use, which brings more space for the development of ceramic products, and daily ceramics emerge therefore. The article respectively elaborates the substantive characteristics, aesthetics and popularity of daily ceramics.

Abstract: A new DSH type dynamic-static combined mixer, which combines the advantages of dynamic mixing agitator and SH type static mixer, with the structure of alternative connection of the turning impeller, liquid shunt unit and double-barreled helical stationary blade, is original designed by the author. The allotype impeller is driven by the two-phase flow and meanwhile the two-phase flow is sheared by the allotype impeller. The double helix eddy flow is formed out of two-phase flow by the stationary blade due to the shearing effect of allotype impeller which results in the improvement of mixture efficiency. The most characteristic of this design is: the mixture is driven by the dynamic force of liquid itself, therefore the energy is saved and the mixture efficiency is enhanced. Followed by the illustration of the structure, the preliminary analysis of the flow field is carried out, which provides some proofs for the selection and optimization of the static-dynamic combined high efficient mixer structural parameters.

Abstract: The structure angles should be calculated in the process of turbodrill’s cascade blade profile design. The angles are calculated according to the design parameters, which is the inlet and outlet flow angles of the cascade, but while fluid is flowing in the cascade, there are difference betweens the inlet flow angle and inlet structure angle as well as outlet flow angle and outlet structure angle in the cascade. The flow angles can’t be directly considered as the blade profile’s structure angles, so it is necessary to modify the calculated flow angles to obtain structure angles. Through the analysis, in order to improve the performance of the turbodrill, the flow angles should be modified to get the structure angles toward reducing direction. In this paper, the hydraulic efficiency and circumferential force fx are selected as evaluation parameters , cascade CFD models are built and calculated with the different modified angles. What’s more, the modified inlet and outlet flow angle impact on the turbine performance has been analysed , the given angle modification range is greatly narrowed in existing literature, which allow the designers determine modified value easily in the angle modification process.

Abstract: The best is to read these instructions and follow the outline of this text. This paper models and simulates the parking behaviors in a main commercial area in Peace Plaza, Dalian City. By analyzing the simulation results, we propose a feasible plan to solve the problem that some customers cannot find a parking space and there are too many illegal parking behaviors in this area. The simulation shows that it can effectively reduce the number of cars that can’t find a parking space or illegally park by the road.