For traditional combustion chambers, when the working condition deviates from the design point, the combustion efficiency will be greatly reduced, and harmful products such as NOx, CO and UHC will increase greatly. This brings huge waste of fuel and air pollution. In order to improve the combustion efficiency at off-design conditions, in this paper a new method using a circular transverse jet as a means of fuel injection, fuel/air mixing and flame stabilization is explored, and an innovative configuration of transverse jet device is developed. Accordingly, the circular transverse jet is studied numerically and experimentally. It is found that the unique aerodynamic structure and high turbulence intensity of the circular transverse jet give an efficient mixing of the fuel and the mainstream along the fuel jet trajectory. Although the deviation of the total excess air coefficient is far from 1, a uniform mixture is formed in the recirculation zone downstream of the jet with an excess air coefficient approaching to 1. Experimental results show that the average excess air coefficient in the recirculation zone is about 1.29, and the combustion efficiency reaches more than 99% at the end of the recirculation zone when the overall excess air coefficient is 10.5, even under the low pressure and temperature conditions. These results demonstrate an effective improvement of the combustion efficiency at off-design conditions by the method proposed in this paper. In addition, the flow field structure under the interaction of circular transverse jet with mainstream, the distribution characteristics of gas components and temperature in the combustion zone are studied, which laid the foundation for the further study and the engineering application of this method.

对于传统的燃烧室，当工作条件偏离设计点时，燃烧效率将大大降低，有害产品（如NOx，CO和UHC）将大大增加。这带来了巨大的燃料和空气污染浪费。为了提高非设计工况下的燃烧效率，本文研究了一种利用圆形横向射流作为燃料喷射，燃料/空气混合和火焰稳定的新方法，并提出了一种新颖的横向射流装置。发达。因此，对圆形横向射流进行了数值和实验研究。已经发现，圆形横向射流的独特的空气动力学结构和高湍流强度使燃料和沿燃料射流轨迹的主流有效混合。尽管总过量空气系数的偏差远离1，但是在射流下游的再循环区域中形成了均匀的混合物，过量空气系数接近1。实验结果表明，再循环区域中的平均过量空气系数为当空气过剩系数为10.5时，即使在低压和低温条件下，燃烧效率在再循环区末端达到约1.29时，燃烧效率也可达到99％以上。这些结果表明，本文提出的方法可以有效提高非设计条件下的燃烧效率。另外，研究了圆形横向射流与主流相互作用下的流场结构，燃烧区气体成分分布特征和温度，