燃气涡轮增压系统燃烧室设计

根据燃气涡轮增压系统结构要求，提出了一种新型滚流回流燃烧室结构，通过CFD数值模拟，研究其内部温度场和出口温度分布情况，确定了燃烧室的主要结构参数.采用粒子图像测速仪（PIV）测量燃烧室内筒头部的冷态流场，证明燃烧室头部存在滚流回流区，能够形成稳定的火焰区.在燃烧试验中，进行了贫油点火和贫油熄火试验研究.结果表明在一定流量范围内，文中燃烧室贫油点火及贫油熄火油气比均随进口马赫数的增大而增大；将文中燃烧室与外形尺寸相近的旋流进气燃烧室的总压恢复系数对比，结果表明相同的流量下文中燃烧室的总压恢复系数平均提高约2%. 

Design of Combustor for Gas Turbocharging System

A combustor of tumbling flow and recirculating flow was designed to satisfy the need of compact structure of diesel engine and to solve driving power shortage problem in the plateau with gas turbocharging system.Firstly,the internal temperature field and exit temperature distribution were analyzed by CFD numerical simulation and the main structural parameters of the combustion chamber were determined.Then the cold flow field of the combustor's dome was measured by the particle image velocimetry(PIV)to testify the tumbling flow,recirculating flow and capable steady blaze sections existing in the combustor's dome.Finally,a combustion experiment was implemented to analyze the oil deficient ignition and flameout.Experimental results show that,in a certain flow range,the gas oil ratio of both lean ignition and lean blowout is proportion to Mach number.Compared the total pressure recovery coefficient of the designed combustor with that of a same-sized recirculating-flow combustor,in the same flow,the total pressure of the designed combustor can increase by an average 2%.