Gas turbine power generation is relatively minor in terms of pollutant emissions, such as nitrogen oxides or sulfur oxides, as compared to thermal power generation using coal or petroleum. This is because of the use of liquefied natural gas, known as an eco-friendly power generation solution. Large gas turbines used for power generation are suitable for the power load demanded by modern society, which fluctuates very much with respect to power consumption because it takes only about 10–20 min to reach the entire output from the start-up. A large gas turbine used for power generation is a rotating machine that features a high degree of difficulty in mechanical design due to its fast start-up characteristics, structural complexity, and high operating temperature, while also emphasizing stability. Customers are demanding operational reliability as a prerequisite before evaluating the performance of a gas turbine. It is very important to design and verify the rotor dynamics sufficiently and accurately from the design stage prior to fabrication in light of that it is very difficult to change the rotor dynamics characteristics once the design is completed and finished. Many researchers are trying to improve the design completeness, but the researches that actually design and verify the power generation gas turbine are limited only to a few manufacturers with the original technology, so there is little verification of actual gas turbine. In this paper, rotor dynamics analysis and verification of a 270 MW class DGT-300H gas turbine rotor newly developed by DHI. To verify the center tie-rod type rotor design of a large gas turbine for power generation, which was conceptually designed using in-house design tools, a 1/5 scaled model was designed by applying the dynamic scaling law. In order to verify the suitability of the applied tie-rod design, the characteristics of the variation of the natural frequency with the variation of the pre-tightening force were tested in order to confirm the dynamic proper pre-tightening force. The design of the scaled model rotor was created, the model was designed and fabricated, and the natural frequencies were analyzed and tested to confirm the validity of the design method and the suitability of the analysis results. After the design of the large gas turbine rotor for 270 MW class power generation, the natural frequencies of the rotor before the blade installation were analyzed and the suitability of the design was verified by implementing a vibration test of the rotor before blade installation.

与使用煤或石油的热力发电相比，燃气轮机发电在污染物排放方面相对较小，例如氮氧化物或硫氧化物。这是因为使用了液化天然气，这是一种环保的发电解决方案。用于发电的大型燃气轮机适用于现代社会所要求的电力负载，由于其从启动到达到全部输出所需的时间仅约10–20分钟，因此其电力消耗波动很大。用于发电的大型燃气轮机是旋转机械，由于其快速的启动特性，结构复杂性和较高的工作温度，同时还强调稳定性，因此在机械设计上具有很高的难度。客户要求在评估燃气轮机性能之前将运行可靠性作为前提条件。鉴于在设计完成和完成之后很难改变转子动力学特性，因此在制造之前从设计阶段就充分，准确地设计和验证转子动力学非常重要。许多研究人员正在试图提高设计的完整性，但是实际设计和验证发电燃气轮机的研究仅限于使用原始技术的少数制造商，因此对实际燃气轮机的验证很少。本文对DHI新开发的270 MW级DGT-300H燃气轮机转子进行了转子动力学分析和验证。为了验证大型燃气轮机用于发电的中心连杆式转子设计，该设计是使用内部设计工具进行概念性设计的，通过应用动态缩放定律设计了1/5缩放模型。为了验证所应用的拉杆设计的适用性，测试了固有频率随预紧力的变化而变化的特性，以确认动态适当的预紧力。建立了比例模型转子的设计，对模型进行了设计和制作，并对固有频率进行了分析和测试，以验证设计方法的有效性和分析结果的适用性。在设计了用于270 MW级发电的大型燃气轮机转子之后，