دانلود رایگان مقاله شبیه سازی و بررسی تجربی مواج اینترکولر باله و لوله

Abstract

In this paper, flow and heat transfer characteristics in the fin-and-tube intercooler were numerically investigated using the FLUENT software by adopting the porous medium approach, which could obtain the distributions, including temperature, pressure and non-uniform, etc. The effects of the air flow rate on the resistance characteristic and the heat transfer performance were analyzed. The simulation results show that the pressure drop and the heat transfer capacity increase with the increase of air flow rate. Simultaneously, the coolant distribution is uniform in the header with the maximum error within±10%. Two kinds of coolant flow schemes have an important influence on heat transfer. Those results also confirm that the higher the heat transfer rate, the lower the inlet coolant temperature is. Finally, comparison results show that the numerical results based on the heat transfer model in porous medium agree well with the measured data based on the engine bench test. The conclusions of this paper are of great significance in the improvement of fin-and-tube intercooler.

5. Conclusion

In the present study, the calculation model based on the porous media theory is developed to predict the flow field and temperature field of the intercooler which is used in the heavy-duty diesel engine. Detailed study of the heat transfer performance has been conducted under the different boundary conditions. Conclusions are summarized as follows: (1) Get the flow field and temperature field inside the intercooler under the different air mass flow rates. Results show that the air mass flow rate has an important influence on the heat exchange efficiency. The part which has the largest thermal stress is found by simulation, and the stress is bigger with the increase of air flow rate. The simulation results show that the porous medium model could effectively investigate the fluid flow and heat exchange in the intercooler. (2) Obtain the change trend about the effects of mass flow rates on the total heat exchange performance under the different conditions. The difference of the heat transfer rate under the two heat exchange types is almost 10%. Moreover, the changes of coolant flow rate have a slight influence on the heat transfer rate while the coolant temperature has a significant impact. The simulation results show that the influence of coolant parameters on the overall heat transfer power not only depends on the inlet temperature but also depend on the mass flow rate. The bigger the coolant flow rate, the more the heat transfer power. And the higher the inlet temperature, the less the heat transfer. (3) The heat exhage rate are calculated for the wavy fin-and-tube intercooler based on porous model. The simulation results are in good agreement with bench test results within 15%. Experimental data and simulation models used in this paper can be used to estimate the thermal performance of the wavy fin intercooler during the initial design phase.