Analysis on Influencing Factors of the Gas-liquid Mixing Effect of Compressed Air Foam Systems

摘要

Compressed Air Foam System is a kind of new high efficiency firefighting systems. It produces high quality foams by injecting compressed air into foam solution. The gas-liquid mixing effect determines properties of foams. Properties of foams determine the efficiency of extinguishing. This paper introduced the status of compressed air foam system gas-liquid mixing technology, categorized and analyzed existing gas-liquid mixing modus, finally put forward factors influencing mixing effect. Stability of foams was used as criteria to evaluate the gas-liquid mixing effect. Gas-liquid mixing modus, gas-liquid mixing area and turbulence enhancer were three factors determined by mixing chamber structure. Gas-liquid flow ratio, gas-liquid mixing pressure and gas-liquid mixing speed were another three factors determined by working parameters. These factors were analyzed and corresponding optimization advices were put forward in order to better gas-liquid mixing effect. This paper could provide some guidance to the design of mixing chambers and optimization of mixing parameters.