Kz4a ~ C-type Electric Locomotive Indoor Air Distribution Experimental Study And Numerical Simulation,

With the continuous development of railway traction technology, the electric traction will take an important role in the transportation tasks, and will be in a dominant position in the future railway transportation in our country. The electric locomotive is an important component of the modern electrified railways. The increasing speed of the train lead to the poor indoor climate environment of the locomotive cab, thus the air-conditioning system become one of the necessary equipment. A good airflow organization form can improve the working conditions of the cab and the security of driving, therefor, based on the comparative analysis of the experiment and the numerical simulation, the air flow and heat transfer in the locomotive cab were studied in this paper.The study object of this paper is a model electric locomotive cab of CSR in zhuzhou. First, the supply air parameters of the air conditioning systems and the speed,temperature distribution of the typical cross-section in the cab were measured, the results could be used to evaluate the rationality of the organization of the air conditioning system in the cab, some of which could be used as the boundary conditions of the indoor airflow organization simulation in the locomotive cab. Besides the results could also be used to verify the accuracy of numerical simulation. Then some appropriate simplification were taken for the irregular structure of the internal cab, turbulent flow theory was used, the control volume method and Realizableκ-εturbulence model were adopt for the steady-state numerical calculation for the airflow organization in the cab to obtain the interior velocity and temperture distribution. Then the numerical calculation conditions which the locomotive run in the actural environment were improved. Finally, discussesed and evaluated the uniformity of the indoor airflow and thermal comfort in the locomotive.The results of the study show that:the calculation results have a good agreement with the experimental results, which illustrated that the simulation results were with a good reliablity and a high accuracy, can be used to eveluate the indoor airflow organization and personnel thermal comfort; by introducing the factors of solar radiation into the calculation we can find that the indoor temperature distribution in vertical direction vary with the change of the sun radiation intensity of illumination; from the discussion on airflow organization with the mumerical calculation results, we can find that the uniformity of indoor velocity distribution is good, but a stratification in the vertical direction in the temperature distribution, the microclimate environment around people satisfy the thermal comfort standard.The research in this paper provide a reference for evaluating the indoor airflow reasonable and improving designing the air conditioning system in the locomotive cab.