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With the development of our high speed train, passengers on the train ride comfort requirements are gradually increased. Therefore we should study some emergency cases in car environment. The article explores the use of CFD software method to realize the full return air model, provide the basis for the research of full return air mode so as to the carriage, it has important value to improve the research environment in the carriage.

Study on the realization method of the high-speed train full return air mode