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首页> 外文会议>ASME turbo expo: turbine technical conference and exposition >SHORT HELICAL COMBUSTOR: DYNAMIC FLOW ANALYSIS IN A COMBUSTION SYSTEM WITH ANGULAR AIR SUPPLY
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SHORT HELICAL COMBUSTOR: DYNAMIC FLOW ANALYSIS IN A COMBUSTION SYSTEM WITH ANGULAR AIR SUPPLY

机译：短螺旋燃烧器：带有角空气供应的燃烧系统中的动态流动分析

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A novel gas turbine combustor which features a helical arrangement of the burners around the turbine shaft has been subject of a detailed flow analysis. A fundamental investigation of the combustor concept has been conducted in the authors previous work. The main design parameters for such a combustor were identified based on kinematic assessments of the flow fields predicted by CFD. In particular, it has been shown in the previous work that the swirl rotational direction of adjacent burners determines the overall flow pattern in such a staggered design of the combustor dome. However, for the optimal configuration the exit mean flow angle was lower than the half of its initial value at the combustor inlet. The reason for this unwanted decay of the initial high angular momentum flux was not clear. In the present work a comprehensive global flow analysis of such a short helical combustor is performed. The underlying physics of large changes of the flow pattern and exit flow angle are elucidated by the analysis of the different terms (momentum, pressure and friction) in the integral balance equation of angular momentum. The term "dynamic flow analysis" is used in contrast to the "kinematic flow analysis" in our previous work and does not refer to transient flow phenomena. It is shown that the flow in the vicinity of the burners is governed by inertial forces associated to an asymmetric pressure distribution on the sidewall and the combustor dome. Downstream the sidewalls, the swirl rotational direction of circum- ferentially adjacent burners determines the structure of vortex-breakdown and the flow pattern in the primary combustion zone. It is shown that the turbulent mixing phenomena have minor effects on the flow structure at the combustor exit. To compare mean flow quantities of different combustor designs, a consistent averaging method is introduced which is based on the work of the Pinako and Wazelt. This analysis can also be applied to conventional combus-tors to assess different swirl configurations regarding the resulting flow pattern, mixing performance and total pressure loss.
机译：一种新型燃气涡轮机燃烧器，其特征在涡轮轴周围的燃烧器的螺旋布置已经进行了详细的流动分析。在提交人之前的工作中，对燃烧器概念进行了基本调查。基于CFD预测的流场的运动学评估鉴定了这种燃烧器的主要设计参数。特别地，已经示出了相邻燃烧器的涡流旋转方向在燃烧器圆顶的这种交错设计中的整体流动模式中示出。然而，对于最佳配置，出口平均流量角度低于燃烧器入口处的其初始值的一半。这种不需要的衰减初始高角动量磁通量的原因尚不清楚。在本工作中，进行了这种短螺旋燃烧器的全面全局流动分析。通过分析角动量的积分平衡方程中的不同术语（动量，压力和摩擦）来阐明流动模式和出口流动角度的大变化的底层物理。术语“动态流分析”与我们之前的工作中的“运动流分析”相反，不参考瞬态流动现象。结果表明，燃烧器附近的流动由与侧壁和燃烧器圆顶上的不对称压力分布相关的惯性力来控制。下游侧壁，周围相邻燃烧器的旋转旋转方向决定了涡流击穿的结构和初级燃烧区中的流动模式。结果表明，湍流混合现象对燃烧器出口处的流动结构具有轻微影响。为了比较不同燃烧器设计的平均流量，介绍了一种基于Pinako和Wazelt的工作的一致平均方法。该分析也可以应用于传统的拟合型，以评估关于所得到的流动模式，混合性能和总压力损失的不同涡流配置。

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