Influence of flow regime characteristics of two-phase flow in pipes on the atomization characteristics of premixed two-phase flow
The premixed two-phase flow atomization method offers advantages such as effective atomization and low atomization pressure when integrated into vehicle-mounted water mist systems.However,it encounters challenges like pipeline surges and periodic fluctuations in fog flow.This study focuses on the structure and operational parameters of an actual water mist mixing system in the Shenyang subway.Experimental and numerical simulations were conducted to analyze the flow characteristics within the pipeline.The research revealed that surge occurrences in the premixed two-phase water mist system primarily stemmed from slug flow and annular flow formed by the mixed flow during the drainage process in the pipeline.Altering the transport parameters of the mixed flow allowed for a transformation of the flow pattern from mixed flow to fog flow and bubble flow with greater uniformity.Considering the operational conditions and spatial limitations of the vehicle water mist system,this study suggests that the surge issue in the current system can be effectively resolved by decreasing the diameter of the conveying pipe.This adjustment does not affect the gas and liquid consumption levels or the system layout space of the existing system.
Premixed two-phase water mistVehicle water mistMixed flowFlow typeSubway
NETL
NSTL
万方数据
