A Surge/Stall-Capable Dynamic Performance Simulation Methodology for a Turbojet Engine

IF 1.4 4区 工程技术 Q3 ENGINEERING, MECHANICAL
Emrah Güllü, Gökhan Aran
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引用次数: 0

Abstract

Abstract A lumped-parameter dynamic performance model for a single-spool turbojet engine is presented in this paper. This model can handle pre and poststall transients under forward and reverse-flow conditions. The inter-component volume technique is employed instead of the standard matching technique to be able to handle high-frequency transients and reverse-flow conditions. Inspired by Greitzer's lumped-parameter surge model, momentum (duct) and volume elements are placed within the flow path to handle surge dynamics. Compressor and turbine maps are extended to low-flow and reverse-flow regions using a combination of the guidelines presented by Kurzke, the cubic axisymmetric characteristics of Moore and Greitzer, and a quadratic function guess for in-stall characteristics. Combustor efficiency, stability limits, and delay are taken from the literature. Poststall behavior of the model is validated using the data available in the literature for a Rolls-Royce Viper engine. A good match is observed with a correct prediction of poststall behaviors, which transition from surge after locked stall to multiple surge cycles around 80% speed and multiple surge cycles to surge after flameout around 95% speed. The effects of different modeling choices and modeling parameters on the obtained results are discussed. The produced model can be calibrated for a specific engine with surge tests, and it can be used for hard-to-test scenarios like surge after shaft breakage. Different surge/stall-causing events, such as fuel spiking, in-bleeding, and shaft breakage, are simulated to see the capabilities of the model.
涡喷发动机的喘振/失速动态性能仿真方法
摘要本文建立了单轴涡喷发动机的集总参数动态性能模型。该模型可以处理正流和逆流条件下的失速前后瞬变。采用分量间体积技术代替标准匹配技术,能够处理高频瞬态和逆流条件。受Greitzer的集总参数喘振模型的启发,动量(管道)和体积元素被放置在流道中来处理喘振动力学。利用Kurzke提出的准则、Moore和Greitzer的三次轴对称特性以及安装特性的二次函数猜测,压缩机和涡轮映射扩展到低流量和逆流区域。燃烧效率,稳定性限制,和延迟是从文献中采取的。利用罗尔斯·罗伊斯蝰蛇发动机的文献数据验证了该模型的后失速行为。通过正确预测失速后的行为,可以观察到良好的匹配,从锁定失速后的浪涌过渡到80%速度左右的多个浪涌周期,以及在95%速度左右熄火后的多个浪涌周期。讨论了不同的建模选择和建模参数对所得结果的影响。生成的模型可以针对特定的发动机进行喘振测试,也可以用于难以测试的场景,如轴断裂后的喘振。不同的喘振/失速导致的事件,如燃油峰值、漏气和轴断裂,进行了模拟,以了解模型的能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
3.80
自引率
20.00%
发文量
292
审稿时长
2.0 months
期刊介绍: The ASME Journal of Engineering for Gas Turbines and Power publishes archival-quality papers in the areas of gas and steam turbine technology, nuclear engineering, internal combustion engines, and fossil power generation. It covers a broad spectrum of practical topics of interest to industry. Subject areas covered include: thermodynamics; fluid mechanics; heat transfer; and modeling; propulsion and power generation components and systems; combustion, fuels, and emissions; nuclear reactor systems and components; thermal hydraulics; heat exchangers; nuclear fuel technology and waste management; I. C. engines for marine, rail, and power generation; steam and hydro power generation; advanced cycles for fossil energy generation; pollution control and environmental effects.
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