基于物理信息的基于深度学习的新型超临界CO2涡轮弹性流体动力密封建模

IF 2.6 3区 工程技术 Q3 ENERGY & FUELS
K. R. Lyathakula, S. Cesmeci, Matthew DeMond, M. Hassan, Hanping Xu, Jing Tang
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引用次数: 3

摘要

超临界二氧化碳(sCO2)动力循环在化石燃料发电厂、核能发电、太阳能发电和地热发电等广泛的发电应用中显示出提高电厂效率和功率密度的潜力。通过涡轮机械的sCO2泄漏一直是此类应用中主要关注的问题之一。为了提供一个潜在的解决方案,我们提出了一种弹性流体动力(EHD)密封,它可以在高压和高温下工作,泄漏少,磨损最小。EHD密封具有非常简单的套筒状结构,包裹在转子上,初始间隙最小,为μ m级别。在这项工作中,提出了EHD密封的概念验证研究,分别使用简化的雷诺方程和Lame公式来计算流体在间隙中的流动和密封变形。采用传统的预测校正(PC)方法和现代物理信息神经网络(PINN)方法对非线性方程组进行求解。结果表明,基于物理的深度学习方法在求解间隙陡峭压力梯度方面具有良好的计算效率和精度。结果表明:泄漏率随工作压力的增大呈二次曲线增长,在15 ~ 20 MPa高压条件下达到稳定状态,即当初始密封间隙为255µm时,20 MPa时Q = 300 g/s;这表明EHD密封可以量身定制,成为减少发电厂sCO2排放的潜在解决方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Physics-Informed Deep Learning-Based Modeling of a Novel Elastohydrodynamic Seal for Supercritical CO2 Turbomachinery
Supercritical carbon dioxide (sCO2) power cycles show promising potential of higher plant efficiencies and power densities for a wide range of power generation applications such as fossil fuel power plants, nuclear power production, solar power, and geothermal power generation. sCO2 leakage through the turbomachinery has been one of the main concerns in such applications. To offer a potential solution, we propose an Elasto-Hydrodynamic (EHD) seal that can work at elevated pressures and temperatures with low leakage and minimal wear. The EHD seal has a very simple, sleeve-like structure, wrapping on the rotor with minimal initial clearance at µm levels. In this work, a proof-of-concept study for the proposed EHD seal was presented by using the simplified Reynolds equation and Lame's formula for the fluid flow in the clearance and for seal deformation, respectively. The set of nonlinear equations was solved by using both the conventional Prediction-Correction (PC) method and modern Physics-Informed Neural Network (PINN). It was shown that the physics-informed deep learning method provided good computational efficiency in resolving the steep pressure gradient in the clearance with good accuracy. The results showed that the leakage rates increased quadratically with working pressures and reached a steady state at high-pressure values of 15 ~ 20 MPa, where Q = 300 g/s at 20 MPa for an initial seal clearance of 255 µm. This indicates that the EHD seal could be tailored to become a potential solution to minimize the sCO2 discharge in power plants.
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来源期刊
CiteScore
6.40
自引率
30.00%
发文量
213
审稿时长
4.5 months
期刊介绍: Specific areas of importance including, but not limited to: Fundamentals of thermodynamics such as energy, entropy and exergy, laws of thermodynamics; Thermoeconomics; Alternative and renewable energy sources; Internal combustion engines; (Geo) thermal energy storage and conversion systems; Fundamental combustion of fuels; Energy resource recovery from biomass and solid wastes; Carbon capture; Land and offshore wells drilling; Production and reservoir engineering;, Economics of energy resource exploitation
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