چكيده به لاتين
In spite of the advancement of the rail industry over the past few years, the problems of desert cities have remained. Due to the high cost of closing the line for the rail industry, it is necessary to have certain methods to prevent the sand settlement on the rail and to predict this problem. In recent years, some articles have explored this issue, but it is still necessary to use new ideas to solve this problem.
This thesis investigates the effect of the presence of the Humor Travers on the track in the sandstorm via numerical simulation by STAR CCM + software. This simulation is carried out in a two-phase gas-solid method, which is simulated by eulerian method and the air phase is considered as fluid and the sand phase as solid particles. First, the sandstorm without traverses was modeled to ensure the accuracy of the results. Then, the humped slab track as a standard model, and according to the article by Dr. Zakeri, was modeled in four rows on the track and the input flow was modeled in two-phase air-sand flow. A total of 10 different simulations have been modeled based on particle diameter, humps height, volume fraction of sand in inlet and inlet flow velocity. Finally, an airfoil hump type travers model has been offered as the proposed model and the results obtained.
According to the comparison of the results of the standard model and the airfoil model, the use of the airfoil hump travers can reduce the formation of vortices and increase the flow rate of sand and prevents the sand settlement in front and among the humps, which assures rail industry managers that line won't be closed. In addition to not closing the lines, the speed of the train from the desert lines will be increased and will boost the industry more and more in the desert cities of the beloved country of Iran.
