Combined Acoustic Damping-Cooling System for Operational Flexibility of GT26/GT24 Reheat Combustors
Combined Acoustic Damping-Cooling System for Operational Flexibility of GT26/GT24 Reheat Combustors
复制标题
声学阻尼冷却组合系统可提高 GT26/GT24 再热燃烧室的运行灵活性
DOI：
10.1115/gt2015-42287
复制
发表时间：
2015
影响因子：
4.7
通讯作者：
B. Bunkute
中科院分区：
文献类型：
--
作者：
B. Schuermans;M. Bothien;M. Maurer;B. Bunkute
在燃气轮机燃烧室的发展过程中，针对热声引起的压力脉动的对策是一个主要的焦点。针对GT26/GT24型燃气轮机顺序燃烧器前面板，提出了一种由多层多功能高频减振冷却结构组成的新型系统。该装置具有多个单亥姆霍兹阻尼器和先进的对流近壁冷却系统，以提高冷却能力，减少冷却质量流量，从而减少NOx排放。阻尼器的声学特性及其位置被定义为所识别的声学振型的函数。后者是非常重要的，因为阻尼器的设计是为了抵消尖叫声，这些尖叫声的声波波长大约是一个燃烧器正面宽度的数量级。为了识别声学振型，在全尺寸发动机上进行了多次动态压力测量。近壁冷却减振前面板设计代表了一种新技术，该技术已被开发并在发动机层面上成功地用于燃气和燃油的运行。完全消除了脉动对稳定工作范围的限制，从而增加了工作灵活性和使用寿命。除了对阻尼器的声学性能进行彻底的处理外，本文还给出了关于改进的近壁冷却方案的信息。
In the development process of gas turbine combustion chambers, finding countermeasures for thermoacoustically induced pressure pulsations is a major focus. This paper presents a novel system consisting of a multi-layered and multi-functional high frequency damping and cooling structure that is implemented on the sequential burner front panel of the GT26/GT24 gas turbines. The device features multiple single Helmholtz dampers and an advanced convective near wall cooling system to improve the cooling capability and to reduce the cooling mass flow and thereby reducing NOx emissions. The acoustic properties of the dampers and their placement have been defined as function of the identified acoustic mode shapes. The latter is very important since the dampers are designed to counteract screech tones that have acoustic wave lengths of the order of one burner front face width. In order to identify the acoustic mode shapes, multiple dynamics pressure measurements are applied in the full scale engine. The near-wall cooled damping front panel design represents a new technology which has been developed and successfully validated at engine level in fuel gas and oil operation. The restrictions of the stable operating range due to pulsations are completely eliminated resulting in an increase of operational flexibility and lifetime. In addition to a thorough treatment of the damper’s acoustic performance, information on the improved near wall cooling scheme is given in the paper, too.© 2015 ASME