Tunnel aerodynamics issues
Abstract
This chapter, building on the description of tunnel pressures and flows in Chapter 6, discusses a range of practical issues associated with aerodynamic effects in railway tunnels. Firstly, pressure transients in tunnels are considered, and the range of methods used for calculating pressure transients in tunnels is set out, together with their input requirements. Aural pressure comfort is then considered, and the pressure transient limits specified by standards are described, together with an overview of the experiments from which these standards were derived. A probability-based approach to assessing aural comfort is also provided. Methods of reducing these pressure transients are then presented – through ...
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