The principle and the components of the inductive ventilation systems used for the civil air defence underground garage of the Lantian Computer Ltd in Nanjing were introduced.

Aiming at the coupled problem of temperature field and ventilation system fluid field of generator,the three dimensional finite element models of ventilation system fluid field and rotor pole temperature field of a 700 kW bulb turbine generator are presented according to the hydrodynamics and heat transfer theory.

In this paper, some theoretical analysises and relative tests in the laboratory on the noise produced from the axial-flow ventilation system in room air conditioners have been made.

Jet ventilation technique applied and developed in Yuanliangshan tunnel;

Since the first successful application of jet ventilation technology in Yaji tunnel(2528m long) on Jiao-Liu railway in 1988,jet ventilation technology has been gradually used in railway tunnels and rapid progress has been made.

During the construction of Qingshan tunnel,jet ventilation technology is applied and new jet ventilation mode is formed,which effectively meet the requirements of simultaneous construction at five different working faces and trackless transportation system adopted in the tunnel cons.