射流通风增压技术的研究

目前，公路、铁路隧道普遍采用纵向式射流通风，虽然射流通风系统具有很多优点，但射流通风效率较低，一般仅为15％左右．本文采用在射流风机出口设置收缩管以提高射流速度的方法。通过射流增压和隧道通风效率的理论分析及实例计算，表明该方法可使射流增压有显著的提高，最高达到54．8％。从而提高了隧道射流通风的通风效率，大约能提高10个百分点。

Study of the Jet flow Ventilation Pressurization Technology

Up to now, more and more highway and railway tunnels generally use the jet flow type longitudinal system, Although the jet flow ventilation system has many merits, its ventilation efficiency to be low, is only 15%. This article used a method, which established shrinkage pipe at the jet flow outlet, so as to enhance the jet fans outlet injection velocity. Through theoretical analysis and example calculation, Indicated this method may enable the jet flow pressurization to have a remarkable enhancement, achieves 54.8% high. Therefore the jet flow ventilation efficiency also has a great scope of enhancement, about 10 percentage points approximately.