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首页> 外文期刊>Journal of Engineering for Gas Turbines and Power >Influence of the Primary Jets and Fuel Injection on the Aerodynamics of a Prototype Annular Gas Turbine Combustor Sector
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Influence of the Primary Jets and Fuel Injection on the Aerodynamics of a Prototype Annular Gas Turbine Combustor Sector

机译：一次喷气和燃料喷射对原型环形燃气轮机燃烧室空气动力学的影响

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Transverse dilution jets are widely used in combustion systems. The current research provides a detailed study of the primary jets of a realistic annular combustion chamber sector. The combustor sector comprises an aerodynamic diffuser, inlet cowl, combustion dome, primary dilution jets, secondary dilution jets, and cooling strips to provide con-vective cooling to the liner. The chamber contracts toward the end to fit the turbine nozzle ring. 2D PIV is employed at an atmospheric pressure drop of 4% (isothermal) to delineate the flow field characteristics. The laser is introduced to the sector through the exit flange. The interaction between the primary jets and the swirling flow as well as the sensitivity of the primary jets to perturbations is discussed. The perturbation study includes: effect of partially blocking the jets, one at a time, the effect of blocking the convective cooling holes, placed underneath the primary jets and shooting perpendicular to it. In addition, the effect of reducing the size of the primary jets as well as off-centering the primary jets is explained. Moreover, PIV is employed to study the flow field with and without fuel injection at four different fuel flow rates. The results show that the flow field is very sensitive to perturbations. The cooling air interacts with the primary jet and influences the flow field although the momentum ratio has a 100:1 order of magnitude. The results also show that the big primary jets dictate the flow field in the primary zone as well as the secondary zone. However, relatively smaller jets mainly influence the primary combustion zone because most of the jet is recirculated back to the CRZ. Also, the jet penetration is reduced with 25% and 11.5% corresponding to a 77% and 62% reduction of the jet's area, respectively. The study indicates the presence of a critical jet diameter beyond which the dilution jets have minimum impact on the secondary region. The jet off-centering shows significant effect on the flow field though it is in the order of 0.4 mm. The fuel injection is also shown to influence the flow field as well as the primary jets angle. High fuel flow rate is shown to have very strong impact on the flow field and thus results in a strong distortion of both the primary and secondary zones. The results provide useful methods to be used in the flow field structure control. Most of the effects shown are attributed to the difference in jet opposition. Hence, the results are applicable to reacting flow.
机译：横向稀释射流广泛用于燃烧系统。当前的研究提供了一个现实的环形燃烧室扇形的主要喷射的详细研究。燃烧室包括一个空气动力扩散器，进气罩，燃烧室，一级稀释射流，二级稀释射流和冷却带，为衬套提供对流冷却。腔室朝端部收缩以装配涡轮喷嘴环。在4％（等温）的大气压降下采用2D PIV描绘流场特性。激光通过出口法兰引入扇区。讨论了主射流与旋流之间的相互作用以及主射流对扰动的敏感性。扰动研究包括：部分阻塞射流的效果，一次阻塞一个，阻塞对流冷却孔的效果，对流冷却孔位于主要射流的下方并垂直于射流射击。另外，还说明了减小主喷嘴的尺寸以及使主喷嘴偏心的效果。此外，PIV用于研究在四种不同燃料流量下有无燃料喷射的流场。结果表明，流场对扰动非常敏感。尽管动量比为100：1数量级，但冷却空气与主射流相互作用并影响流场。结果还表明，主要的大喷流决定了主要区域和次要区域中的流场。但是，相对较小的喷嘴主要影响主燃烧区，因为大多数喷嘴会再循环回到CRZ。同样，射流渗透率降低了25％和11.5％，分别相当于射流面积减少了77％和62％。研究表明存在临界喷射直径，超过该临界喷射直径，稀释喷射对次要区域的影响最小。射流偏心量约为0.4毫米，但对流场影响很大。还显示了燃料喷射会影响流场以及主喷射角。高燃料流量显示出对流场有非常强烈的影响，因此导致主要和次要区域的强烈变形。结果提供了可用于流场结构控制的有用方法。所显示的大多数效果均归因于喷射阻力的不同。因此，该结果适用于反应流。

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