特长公路隧道纵向—全横向混合通风方式研究

就公路隧道的通风方式而言,目前纵向通风形式逐渐成为主流。但是,纵向通风也有其致命的弱点,如分段不能太长、防火救灾功能差、深埋隧道中间的通风竖井太长、施工困难等。因而对于特长公路隧道,研究除纵向通风形式之外的各种混合通风方式显然有着重要的理论和实践意义。介绍了一种纵向-全横向混合通风方式,并详细地推导了纵向-全横向通风计算方程,边界条件通过配点法满足。数值算例证明了纵向-半横向混合通风方式在特长公路隧道通风中应用的可行性。

Full Wave Analysis of a Broad Wall Waveguide Slot Coupler

A rigorous analysis of a broad wall slot coupler composed of two crossed rectangular waveguides by using FDTD method is presented. Two types of slots, a longitudinal/transverse slot and a centered-inclined slot, are analyzed. Coupling slot characteristics are obtained, including scattering parameters and the resonant length for different waveguide dimensions and frequencies. The numerical results are all in good agreement with those by the method of moments. A coupler system with a short circuit port is also analyzed to help designing the slot array.