公共建筑集中空调风系统极易被利用作为挥发性化学战剂快速传播的通道，从建筑环境防恐角度，急需解决突发毒气污染传播时快速预警和源辨识两个关键问题。本项目提出"传播-预警-溯源"的技术路线，根据突发毒气污染传播的流体动力学，利用毒气化学VOC离子化检测技术，并结合工程领域反问题方法的实践应用，重点开展典型施放情景下毒气污染传播特征、毒气传播离子化分布检测系统、毒气源反问题追踪等三方面的研究。项目将通过缩尺的风系统实验研究，验证基于离子化检测的毒气污染传播的预警模式，预期在突发毒气污染的有限检测点优化布置设计上实现突破，在"风管道系统一维动力学+建筑空间三维动力学"双尺度耦合反问题的分阶段解耦方面取得核心创新成果，为建筑集中式空调风系统的化学污染防治及防恐安全提供依据。

Volatile chemical warfare agents (CWA) are likely to transfer though the centralized air-conditioning system, therefore, it is very necessary to solve the following two key issues, early warning and source identification of the poisonous gas released and spreading in the system. This project adopts such a three-step technology roadmap as 'dispersion, early warning, source identification', based on the fluid dynamics of the sudden gas dispersion, the ionization detection technology of VOC, and the inverse problem in engineering. It focuses on the study of gas pollution propagation characteristics under typical releasing scenarios, optimal distribution of ionization detector system, and the inverse problem of pollution source tracking. It further plans to develop a scaled experimental study of the air-conditioning system to verify the early-warning modes derived by the detector system. Two main outcomes are expected through this project, 1) optimal design of limited number of ionization detectors for the sudden releasing of poisonous gas, 2) and decoupled inverse trace of pollution source under the combined one-dimensional and three-dimensional dynamics in the air-duct system and the building rooms. Results from these innovation works could provide a basis for chemical pollution prevention and counter-terrorism security of the centralized air-conditioning systems.