A fast sensor for non-intrusive measurement of concentration and temperature in turbine exhaust
A fast sensor for non-intrusive measurement of concentration and temperature in turbine exhaust
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DOI：
10.1016/j.snb.2023.134500
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发表时间：
2023-08
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通讯作者：
Rui Zhang;Jiangnan Xia;I. Ahmed;A. Gough;I. Armstrong;A. Upadhyay;Yale Fu;Godwin Enemali;M. Lengden;W. Johnstone;P. Wright;K. Ozanyan;M. Pourkashanian;H. McCann;Chang Liu
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文献类型：
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作者：
Rui Zhang;Jiangnan Xia;I. Ahmed;A. Gough;I. Armstrong;A. Upadhyay;Yale Fu;Godwin Enemali;M. Lengden;W. Johnstone;P. Wright;K. Ozanyan;M. Pourkashanian;H. McCann;Chang Liu
准确、快速地测量燃气涡轮机排气中的水蒸气浓度和温度对于监测其健康和操作性能至关重要。为了同时监测这两个参数，开发了一种基于可调谐二极管激光吸收光谱的非侵入式传感器，该传感器使用8束激光针对水蒸气的3个跃迁。该传感器已在商用辅助动力装置上进行了现场验证。7束5000.2 cm− 1的平行激光束在羽流边界处间隔6.3 mm，以表征热排气羽流和冷周围流之间的边缘效应。其中一束以7185.6 cm− 1和7444.4 cm− 1的双波数工作，穿过羽流中心线，通过比率测温法测量温度。然后，使用该温度信息来获得水蒸气的浓度。4毫秒的时间分辨率实现了8束测量，使高速和同时量化的边缘效应和羽流参数。结果表明，所开发的传感器测量的排气中的水蒸气浓度和温度与传统的基准高度一致，萃取取样和热电偶，分别有0.02%和3 °C的差异。通过其持续的毫秒级测量，该传感器首次揭示了传统方法无法观察到的隐藏发动机行为和燃烧动态，从而促进了下一代燃气涡轮机发动机的实时控制，以实现低排放。
Accurate and rapid measurement of water vapor concentration and temperature in the exhaust of gas turbine engines is critical for monitoring their health and operational performance. To monitor the two parameters simultaneously, a non-intrusive sensor based on tunable diode laser absorption spectroscopy is developed using 8 laser beams targeting 3 transitions of water vapor. The sensor hasin situvalidated on a commercial auxiliary power unit. Seven parallel laser beams at 5000.2 cm−1are 6.3 mm spaced at the plume boundary to characterize the edge effect between hot exhaust plume and cold surrounding flow. One beam, operating at the dual wavenumbers of 7185.6 cm−1and 7444.4 cm−1penetrates the plume through centerline to measure temperature via ratio thermometry. Then, this temperature information is used to obtain the concentration of water vapor. A temporal resolution of 4 ms is achieved for the 8-beam measurement, enabling high-speed and simultaneous quantification of the edge effects and the plume parameters. Results indicate water vapor concentration and temperature in the exhaust measured by the developed sensor are highly consistent with the traditional benchmarks, e.g., extractive sampling and thermocouples, with a difference of 0.02% and 3 °C, respectively. Enabled by its continuous millisecond-level measurements, the sensor, for the first time, reveals hidden engine behaviors and combustion dynamics that are unable to be observed by the traditional methods, thus facilitating next-generation real-time gas turbine engine control towards low emissions.