Research On Airflow And Temperature In The Snow And Ice Melting Device Based On CFD

As the core component of the snow and ice melting vehicle, the snow and ice melting device played a decisive impact in the performance of the snow and ice melting vehicle. Domestic and foreign research institutions in the research of snow and ice melting vehicles were on the initial stage. The goal of the research institutions was that the vehicle could operate effectively and reliably. As the traditional development mostly adopted the experience and analogy methods to design, it had a disadvantage of blindness, the product performance also can only be tested through repeated vehicle experiments, and led to the longer development cycle and higher costs. Along with the development of computer technology and the wide application on computational fluid dynamics, it was possible that the computational fluid dynamics was used on the snow and ice melting device. Based on the theory of CFD, the paper made heat-fluid coupled analysis for the snow and ice melting device by using ANSYS finite element analysis software.Firstly, the computational domain was determined. Using of Pro/E software, three-dimensional solid-based fluid CAD analysis model of the device was built, and the heat-fluid coupled analysis for the device was made. Because of the complex structure of the device and the computer hardware restrictions, it needed much more time to analysis or could not finish the analysis. So the simulation analysis of the heat transferring process was done between the combustion chamber and atmosphere, the results of the simulation analysis showed that the inner and outer shell of combustion chamber played a little role in adiabatic effect, so when building the analysis model, under the accuracy of the calculation, the inner and outer steel were removed so as to reduce the calculation scale largely.Secondly, the boundary conditions of fluid analysis model were determined when the turbofan, combustion machine and air compressor worked on the Rated conditions, and made the numerical simulation on device, and got the airflow velocity, temperature, turbulent kinetic energy and it’s loss of the snow and ice melting device. Simulation results showed that there was loss of kinetic energy because the airflow produced a vortex flow field in the device, the heat efficiency was lower between the high-temperature gas of direct-fired machine and high pressure pipes, this caused that the heat efficiency of snow and ice melting device was lower and airflow velocity and temperature distribution was not reasonable in the exit of combustion chamber, and could not melting ice efficiently.Finally, the structural improvement programs were proposed in order to increase the snow and ice melting efficiency and reduce fuel consumption, and compared the structure performance between improved and not improved. The analysis results showed that the installation position, the shape and size of fire cover had an influence on the combustion chamber internal airflow velocity and temperature distribution, the reasonable structure of the fire cover could minimize the loss of kinetic energy, and improved velocity and temperature distribution, and improved the performance of snow and ice melting device. The results of the paper had some reference significance on the research of snow and ice melting device.