CFD modelling

Now a day, the demand of automobile vehicles is on peak. So, it is a great challenge for automotive industries to contribute a powerful and efficient engine. The performance of an engine affects by various systems like fuel supply system, transmission system, lubrication system, cooling system etc. So, it becomes essential to account them while model an engine for improved the engines performance. Cooling system is one of the important systems. It also increases heat transfer and fuel economy which indications to increases the performance of an engine. Most internal combustion engines are fluid cooled using either a liquid or air coolant run through a heat exchanger (radiator) cooled by air. This review focuses on the various research papers to improve automobile radiator efficiency. Different research papers have applied different method. Has been studied and finalized that the various coolants (nanofluids), tubes, fan and core, change efficiency of radiator at different mass flow rate. From the literature study, it has been seen that the efficiency of the radiator has been increased through a variety of methods, out of which radiator fan is the most used one to improving the efficiency of radiator by modification of radiator fan and radiator tube.

A CFD-model for direct synthesis of Dimethyl Ether (DME) from syngas in a fixed packed bed reactor is presented. One of the recent methods of DME production is the direct conversion of syngas over a dual-catalyst mixture. For the above model, Graaf kinetic model for methanol synthesis and Bercic model for methanol dehydration are used. Three-dimensional CFD simulations of the reactor are demonstrated at operating conditions of 250°C temperature and 8 bar pressure. The compositions of the reactants in the feed streams are 0.32 Carbon-mono-oxide, 0.64 Hydrogen and 0.04 Carbon-dioxide. The simulation results are validated with the available experimental results and further analyzed. The partial pressures of different species are studied in reactor and with respect to time as well, the overall conversion of CO is noted to be 36% in comparison to the experimental value of 38%. The present CFD model results match well with experimental data. The concentration profile of species in terms of partial pressure within the reactor has been analyzed at different fraction of length as well as at different time level. From the results it is concluded that present CFD-model could be a starting point for further studies on the optimization of reactor performance.

Generally, the temperature of flue gases at the furnace outlet is not measured. Therefore, a special computation procedure is needed to determine it. This paper presents a method for coordination of the numerical model of a pulverised fuel boiler furnace chamber with the measuring data in a situation when CFD calculations are made in regard to the furnace only. This paper recommends the use of the classical 0-dimensional balance model of a boiler, based on the use of measuring data. The average temperature of flue gases at the furnace outlet kt obtained using the model may be considered as highly reliable. The numerical model has to show the same value of kt . This paper presents calculations for WR-40 boiler. The CFD model was matched to the 0-dimensional kt value by means of a selection of the furnace wall emissivity. As a result of CFD modelling, the flue gas temperature and the concentration of CO, CO2, O2 and NOx were obtained at the furnace chamber outlet. The results of numer...