蒸发式稳定器气态燃料掺混特性和蒸发管的流量系数  

Mixing Characteristics of Gaseous Fuel in Vapor Flame Holder and Discharge Coefficient of Evaporating Pipe

作　　者：郑殿峰[1] 张会强[1] 林文漪[1] 王家骅[2] 

机构地区：[1]清华大学工程力学系,北京100084 [2]南京航空航天大学动力工程系,南京210016

出　　处：《燃烧科学与技术》2004年第1期28-31,共4页Journal of Combustion Science and Technology

摘　　要：用CO2作示踪剂,模拟蒸发式稳定器蒸发管供油,在蒸发管燃油蒸气射流和预燃流、回流、主流之间的掺混过程中,利用测得蒸发管出口混气CO2浓度平均值得到了蒸发管的流量系数.试验结果显示,各稳定器稳焰槽内,CO2浓度沿周向有明显的变化,具有三元流动的特征,而稳定器下游发展段CO2浓度沿周向的变化很小,处于二元流动状态.得到了不同蒸发管的流量系数,在0.55～0.70之间.结果说明,可用CO2气体模拟复杂流动中燃油蒸气分布规律,测定复杂部件孔的气体流量特性,可用于分析和对比不同结构型式蒸发式稳定器的燃油掺混特性.The mixing process of oil vapor jet, pre-combustion flow, recirculating flow and primary flow are experimentally investigated with CO2 as tracer. The discharge coefficients are obtained through the measured CO2 concentration at the exit of the evaporating pipe. The experiment results show that the flow in the vapor flame holder is a typical three-dimensional flow as the distribution of CO2 concentration varies sharply in streamwise and tangent directions which are induced by the strong mixing process, while the flow in the downstream of the vapor flame holder is a two-dimensional flow as the distribution in the tangent direction is similar, which indicates that the mixing and flow processes have been well developed. The discharge coefficient of various vapor flame holders varies from 0.55 to 0.70. It can be concluded that the experimental investigation on the mixing process of gaseous fuel in a vapor flame holder with CO2 as tracer is successful. The obtained results are useful to analyses the mixing and discharge characteristics of various vapor flame holders.

关 键 词：蒸发式火焰稳定器 蒸发管 流量系数 CO2 浓度分布 

分 类 号：TK411.2[动力工程及工程热物理—动力机械及工程]