High-repetition-rate laser diagnostics experiments for prediction and control of thermo-acoustic instabilities in low-emission gas turbine engines

本研究的重点是预测和控制低排放，燃料灵活的燃气涡轮机发动机的热声不稳定性的方法。燃气涡轮机用于绝大多数商用飞机，并越来越多地用于地面发电。为了减少航空旅行和能源生产对环境的影响，因此有必要开发未来的发动机，以最大限度地减少污染物排放，并安全地使用各种可持续的替代燃料。不幸的是，产生低排放的火焰非常不稳定。在燃气涡轮机燃烧室中，这通常导致高振幅燃烧和压力振荡的自激，或热声不稳定性，这会降低效率，增加排放，关闭发动机，甚至导致灾难性故障。这些不稳定性的激发是由目前无法预测或鲁棒控制的复杂的流-燃烧-声耦合引起的。

This research focuses on methods to predict and control thermo-acoustic instabilities in low-emission, fuel-flexible gas turbine engines. Gas turbines are used on the vast majority of commercial aircraft and are increasingly being employed for terrestrial power generation. In order to reduce the environmental impact of air travel and energy production, it therefore is necessary to develop future engines that minimize pollutant emissions and safely operate with a variety of sustainable alternative fuels. Unfortunately, flames that produce low emissions are very unstable. In gas turbine combustors, this often leads to the self-excitation of high-amplitude combustion and pressure oscillations, or thermo-acoustic instabilities, which can reduce efficiency, increase emissions, shutdown the engine, and even cause catastrophic failure. Excitation of these instabilities is caused by a complex flow-combustion-acoustic coupling that currently cannot be predicted or robustly controlled.