高速列车通过小断面隧道引起的强交变气动压力，恶化列车气密性能，造成车体结构疲劳损伤，降低车体气密性，引发乘客人耳不适，严重影响高速列车运行安全性和乘坐舒适性，已成为制约高速铁路发展的主要瓶颈之一。因此，建设以高速列车和乘员为核心，考虑耦合关系，实现车/隧气动耦合关键参数合理匹配，是目前亟待解决的难题。本项目采用理论分析、数值仿真和试验相结合的方法，开展面向列车临界气密性能的车/隧气动耦合关键参数合理匹配研究，旨在探明列车内外交变气动压力波形特点和分布特征，提出用于评价隧道内整列车气密强度的车内外压力取值方法，确定影响车辆气密性能的车/隧气动耦合参数权重，建立面向列车临界气密性能的车/隧气动耦合关键参数匹配优化模型，着力提升高速铁路的技术、社会、经济和环境效益。为我国高铁发展，“一带一路”、“交通强国”和高铁“走出去”国家战略的实施，提供空气动力学方面的相关理论与技术支撑。

The strong alternating pressure load caused by the high-speed train going through a small cross-section tunnel would worsen the train airtightness performance, cause the fatigue damage of the train body structure, reduce the vehicle airtightness, and bring ear discomfort to passengers, and seriously affect the train running safety and human ride comfort. The above has become one of the major bottlenecks in the development of high-speed railway. Therefore, there currently exists an urgent problem to determine the key parameters of coupling system of vehicle and tunnel for vehicle airtightness performance and achieve rational matching of these key parameters through taking the high-speed train as the core and taking account of the coupling between train and tunnel. In this thesis, theoretical analysis, numerical simulation and experiment are adopted as method to study the rational matching method of key parameters of aerodynamic coupling system of train and tunnel for the vehicle airtightness performance. It aims at exploring characteristics of both waveform and distribution of the alternating pressure inside and outside the vehicle, proposing a method for choosing alternating pressure value to evaluate the airtightness strength of the whole train running in the tunnel, determining the weight of parameters of coupling system of train and tunnel for train airtightness performance, and constructing matching and optimization models of key parameters of coupling system of train and tunnel for train critical airtightness performance to improve the high-speed railway technology, social, economic and environmental benefits. This project can provide theoretical and technical support in train aerodynamics for the development of China's high speed rail, and implementation of some national strategies, such as "the Belt and Road", "traffic power" and high-speed rail “going abroad".