Design and Analysis Of Monorail Train Nose

Abstract

Railway train aerodynamic problems are closely associated with the ows of air occurring around train. Much e_ort to speed up the train system has been concen- trated on the improvement of electric motor power rather than understanding the ow around the train. This has led to larger energy losses and e_ciency reduction of the train system. The need for study of aerodynamics around train arises as the ows around train are more disturbed due to turbulence of the increased speed of the train, and consequently the ow energies are converted to aerodynamic drag, noise and vibrations. To _nding out the pressure distribution on to the nose surface the wind tunnel experiments are well known but it is very costly and time consuming a_air. More over this technique requires very high skilled personnel and that's why the need for an alternative method to solve aerodynamic problem arises. The primary intention is generate the shape which should be _t in given space. Here the approach is _rst design based on the 2D di_erent con_guration shapes for di_erent cases. To make the 3D model the model is divided in to the three 2D shapes which are the extreme shapes of the monorail train nose. The extreme sections means where the pressure due to the ow of air becomes dominant in the train body, three extreme sections like mid section from the side, top section which having maximum area and front section is the section of the car body. All these three shapes are to be solved by CFD analysis and the shape satis_es all requirements like limitation on negative pressure generation, minimum coe_cient of drag, and lift can be selected as optimized shape to generate _nal 3D shape. This method is very less time con- suming and if any modi_cation is required then can be change very promptly in 2D. The main intention is to achieve the streamlined shape for monorail. Once the 3D shape is developed then the _nal CFD analysis and FE analysis can be done on that produced 3D shape. viii This work gives the optimized shape for monorail train within given constraints. CFD (Computational Fluid Dynamics) analysis is done on various shapes of con_gu- rations of monorail train nose with Fluent 6.3. FRP is used to manufacture train nose as it is light weight and high strength material. Optimum thickness of this material to sustain pressures generated due to high speed movement of monorail train in open conditions is studied and simulated in Fluent and HYPERMESH.