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This paper simulates and analyzes non-uniform thermal environment in the cabin by means of CFD. The RNG k -ε turbulent model is chosen, and the Discrete Ordinates radiation model is used to calculate the thermal radiation of the cabin. This paper analyses the influence of three different solar incidence angles on the thermal comfort of car occupants. A reference for the optimal research of the evaluation...
Because of the ability to reveal characteristics of air flow in detail, the numerical simulation method becomes more important in designing high-speed train parts with better aerodynamic performance, such as nose shape, lower-drag body and so on. Using a CFD code based on the finite volume method and blocking structured hexahedron mesh generated using ICEM CFD software, the present study carried out...
The aerodynamic characteristics of ordinary vehicle have been studied by lots of scholars, while few people pay enough attention to the motorcycle's aerodynamic characteristics. But as the requirements of laws and regulations for motorcycle's performance continues to increase and the motorcycle market develops, doing motorcycle's aerodynamic characteristics analysis is much more necessary now. In...
Because of the ability to reveal the characteristics of fluid flow in detail, the numerical simulation method becomes more important in designing high-speed train parts with better aerodynamic performance, such as nose shape, lower-drag body and so on. Using a CFD code based on the finite volume method, the present study carried out numerical simulation of air flow around ICE2 high-speed train under...
The features of air flows around simplified car model, Ahmed car body, are representative of that around automotive vehicles which move close to the ground. The paper is about the effect of inlet turbulence parameters on numerical simulation of Ahmed car body using a generic commercial CFD code STAR-CD, based on comparison with reference experiment data. The linear low Reynolds number k - ε turbulence...
The quantity and distribution of wind-driven rain on building envelopes have considerable effect on the hygrothermal performance and the material durability of building facades. A better understanding of the mechanism of wind-driven rain and its interaction with the building is of important to the building maintenance design. In this paper, the wind-driven rain distribution on a low-rise building...
In this study, we establish a numerical model and use computational fluid dynamics (CFD) analysis to measure peak pressure on the surface of filter bag. The numerical results are in good agreement with the experimental data during the pulse cleaning process. Peak pressure on the surface of filter bag, pressure rise rate and maximum reverse acceleration are used as evaluation indicators of bag-cleaning...
Square Tulou as the typical of Fujian province. Based on Computational Fluid Dynamics (CFD) software CFX and the SST k-ω) turbulence physics model, this article simulate the wind environment of tulou under different Wind incidence direction, In order to more accurately predict tulou wind environment. To be pedestrian height of the wind speed separation in the corner, where the formation of similar...
Based on the analysis of coal-ash average infiltration rate with different density and different mixed ratio with soil by applying CFD numerical simulation method, and comparison with actual data of the document [12], the results showed that: coal-ash average infiltration rate is inversed with the sample density in the experiment. At the same time, the curvature of curve fitting varied with different...
A free-piston linear alternator (FPLA) is being developed by the Beijing Institute of Technology to improve the thermal efficiency relative to conventional crank-driven engines. A two-stroke scavenging process recharges the engine and is crucial to realizing the continuous operation of a free-piston engine. In order to study the FPLA scavenging process, the scavenging system was configured using computational...
Flow behavior of gas and solids is simulated in combination the gas–solid two-fluid model with a cluster structure-dependent (CSD) drag coefficient model. The dispersed phase is modeled by a Eulerian approach based upon the kinetic theory of granular flow (KTGF) including models for describing the dispersed phase interactions with the continuous phase. The drag forces of gas–solid phases are predicted...
For pumps with auxiliary impeller dynamic seals can meet the requirements of high efficiency, long life and high reliability, they are used more and more by industries to meet environmental protection and energy saving. However, the researches have yet been carried out little on the internal flow mechanism of the auxiliary impeller dynamic seals and their design optimization based on energy saving...
Spraying water into high temperature high pressure gas is a two phase flow. An Euler-Lagrange method was used to simulate the two phase flow with evaporation. The gas phase is simulated by solving the Navier-Stokes equations using RK(Runge-Kutta)-AUSM+(Advection Upstream Splitting Method) scheme. A particle trajectory model was used to represent the liquid phase. The source terms were added to the...
Based on the traditional model transformation theory, and integrated with CFD numerical simulation technology, a new modelling design method of nuclear main pump impeller was investigated and proposed. The new method improves the traditional one, can strictly ensure compliance with design pressure, temperature, flow rate, speed, and obtain new impeller precisely corresponding with the design head...
In this paper, a new solution to solve the cold-start emission problem of gasoline direct injection (GDI) engine by combining the special piston top shape with the compound fuel injection system is studied. With the CFD numerical simulation and experiment, the influence of this new solution on air flow and air-fuel mixture formation in the cylinder of gasoline direct injection engine during the cold-start...
Based on the principle of flocculation kinetics, and integrated the structure of radiant sedimentation tank (RST) and the elementary theory of particles sedimentation, hydraulic agitation is taken to realize the coagulating sedimentation after addition chemicals. Meanwhile, CFD software Fluent is used to research with numerical method the operation characteristics of conventional RST. On this basis,...
The calculation model was built under cold condition, based on real geometric structure, 1:1 size experimental device of main reactor of TiO2 in Jinzhou Titanium Industry. And numerical simulation was carried out by commercial CFD software, aiming to analyze internal flow and mixture of multi inlet vertical jet and main-stream. By comparing the numerical simulation results with the experimental data,...
Indoor thermal comfort is an important aspect of architectural environment. Based on CFD and with the use of Airpak, indoor dynamic thermal comfort is researched in this paper. The Computing Model of a common house layout in Tianjin is established. The indoor thermal comfort conditions of wind velocities at different frequencies and different temperatures are simulated. Then the influences of wind...
In this paper a type of ultra supercritical boiler was researched for BMCR operating condition numerical simulation with the CFD software Fluent. When this type of boiler burning design coal in the BMCR operating condition, the combustibles content of fly ash is low, the combustion efficiency is high and the emission of NOx is low. The maximum heat load of the wall is located between the burner and...
Numerical simulation of combustion process in a 200 MW coal-fired boiler is performed using CFD software. The work is focused on concentrate-lean burner, which arranges with different horizontal tilts and the air-staging technique. The numerical simulations on the regular burner have been validated with the experiment data. The other simulation results using the same models could be considered for...
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