Multidisciplinary Design Methodology for Micro-Gas-Turbines - Part I: Reduced Order Component Design and Modelling

Lukas Badum, Felix Schirrecker, B. Cukurel
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Abstract

Ultra micro gas turbines (UMGT) for electric power generation up to 1 kW are a viable replacement technology for lithium batteries in drones due to their high energy density. Previous research has shown that small-scale effects disqualify conceptual design practices applied to larger gas turbines owing to highly coupled, non-linear component interactions. To fill this gap, we propose an interdisciplinary conceptual design and analysis framework based on reduced order models. To this end, the current work is divided into two parts covering component design and system integration, analysis and optimization. In Part I, automated conceptual design of all engine sub-components is elaborated facilitating interdependent reduced order models for compressor, turbine, combustor and high-speed generator, while also considering additive manufacturing constraints. In a second step, the reduced order performance models are compared to CFD RANS simulations of various turbomachinery geometries as well as experimental data of combustor and high-speed generator prototypes, showing good agreement and thus validating the component modules. In conclusion, the first part of this work elaborates an automated and efficient method to conceptual design of all components required for a functional UMGT. Since the strategy is applicable independent of component arrangement and engine layout, the proposed methods offer a universal framework for small gas turbine generators.
微型燃气轮机多学科设计方法 - 第一部分:低阶组件设计和建模
用于发电的超微型燃气轮机(UMGT)功率可达 1 千瓦,由于其能量密度高,是无人机中锂电池的可行替代技术。以往的研究表明,由于高度耦合的非线性组件相互作用,小尺度效应使应用于大型燃气轮机的概念设计实践失去了可行性。为了填补这一空白,我们提出了一个基于减阶模型的跨学科概念设计和分析框架。为此,目前的工作分为两部分,涵盖组件设计和系统集成、分析和优化。在第一部分中,我们详细阐述了所有发动机子组件的自动化概念设计,为压气机、涡轮、燃烧器和高速发电机建立了相互依存的减阶模型,同时还考虑了增材制造的限制因素。第二步,将减阶性能模型与各种涡轮机械几何形状的 CFD RANS 仿真以及燃烧器和高速发电机原型的实验数据进行比较,结果显示两者吻合良好,从而验证了组件模块的有效性。总之,这项工作的第一部分阐述了一种自动、高效的方法,用于对功能性 UMGT 所需的所有组件进行概念设计。由于该方法不受组件排列和发动机布局的影响,因此为小型燃气涡轮发电机提供了一个通用框架。
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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