燃料与空气预混方法及性能研究进展

随着大气污染物排放标准的日益严格，低排放燃烧技术已成为先进燃气轮机发展的关键技术之一。在气态燃料低排放燃烧室中，燃料与空气的预混均匀性是影响NO X 生成的关键因素。基于污染物生成机理及控制方法，指出了燃料空气预混均匀性与NO X 排放的关系，即均匀性越好，NO X 排放越少。根据现有研究内容，从结构参数、旋流/湍流强度、预混距离以及边界条件（温度和压力）等4个方面梳理了国内外提高低排放燃烧室内燃料与空气预混均匀性的研究进展，提出可以通过增大旋流数、燃料穿透深度、预混长度等参数以提高预混均匀性，指出了目前研究中缺少小尺寸短距离空间内燃料与预混均匀性的预测。基于低排放燃烧室技术水平和发展趋势，认为未来的研究方向应为短距离、受限空间内燃料与空气预混均匀性的定量预测与评估。

Research Progress on Fuel-Air Premixing Method and Performance

With the increasingly stringent emission standards of air pollutants， low-emission combustion technology has become oneof the key technologies in the development of advanced gas turbines. The uniformity of fuel-air premixing is the key factor affecting NOxgeneration in a low-emission combustion chamber with gaseous fuel. Based on the mechanism of pollutant generation and control methods，the relationship between premixing uniformity and NO X emissions is pointed out， the better the uniformity， the less NOx emissions.According to existing research contents， the research progresses on improving fuel-air premixing uniformity in low-emission combustionchambers at home and abroad is summarized from four aspects： the structural parameters， swirl/turbulence intensity， premixing distance，and boundary conditions （temperature and pressure）. It is suggested that the premixing uniformity can be improved by increasing the swirlnumber， fuel penetration depth， premixing length， etc. It is pointed out that the prediction of fuel and premixing uniformity in small-sizeand short-distance space is lacking in recent research. Based on the technical level and development trend of low-emission combustionchamber ， it is believed that the future research direction should be the quantitative prediction and evaluation of fuel-air premixinguniformity in short-distance and confined spaces.