sCO2干气密封试验台分离共轭传热程序的开发与验证

IF 1.4 4区 工程技术 Q3 ENGINEERING, MECHANICAL Journal of Engineering for Gas Turbines and Power-transactions of The Asme Pub Date : 2023-10-11 DOI:10.1115/1.4063716
Isacco Rafanelli, Giulio Generini, Antonio Andreini, Tommaso Diurno, Gabriele Girezzi, Andrea Paggini
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引用次数: 0

摘要

超临界状态下的二氧化碳具有良好的闭环Brayton循环和Rankine循环热力学性质。高密度,接近液体,和低粘度,接近气体,驱动实现更高的能量转换效率与较小尺寸的涡轮机和组件。dgs是气体润滑的非接触式端面密封,由配合环(旋转)和主环(固定)组成。由于高转速、小尺寸密封间隙、高流体压力和密度,通过密封摩擦产生的热量对温度分布有很大影响,因此需要热设计保持在密封允许温度以下。目前,数值共轭传热(CHT)分析是一种很好的工业实践,可以量化涡轮机械部件的热分布。另一方面,由于二次流空腔尺寸和DGS密封间隙的数量级不同,使用三维计算流体动力学(CFD)计算模拟整个流体域可能会导致高昂的计算成本。本文提出了一种基于商用一维流网络建模器(Altair flow Simulator)和商用有限元求解器(Ansys Mechanical)的快速数值迭代方法。该方法在Flowserve公司的DGS试验台上得到了应用和验证。以sCO2为工质,在不同的角速度和壳体温度条件下,在试验台运行DGS,生成验证数据集。结果表明,在极低的计算时间内,各工况下的计算结果与实验数据吻合较好。
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Development and Validation of a Segregated Conjugate Heat Transfer Procedure On a sCO2 Dry Gas Seal Test Bench
Abstract Carbon Dioxide at supercritical state shows favorable thermodynamic properties for closed loop Brayton and Rankine cycles. High density, close to a liquid, and low viscosity, close to a gas, drive to achieve higher energy conversion efficiency with smaller size turbines and components. DGSs are gas-lubricated, noncontacting, endface seals, consisting of a mating (rotating) ring and a primary (stationary) ring. Due to high rotational speeds, small size sealing gaps, high fluid pressure and density, the heat generated by friction through the seal has a large impact on the temperature distribution, therefore a thermal design is needed to stay below the seal allowable temperature. Nowadays, numerical Conjugate Heat Transfer (CHT) analysis is a good industrial practice to quantify the thermal distribution in turbomachinery components. On the other hand, due to different order of magnitude of secondary flows cavity sizes and DGS seal gaps, simulating the whole fluid domain with 3D Computational Fluid Dynamic (CFD) calculation could drive to prohibitive computational costs. This paper presents a fast numerical iterative procedure based on a commercial 1D flow network modeler (Altair Flow Simulator) coupled with a commercial finite element solver (Ansys Mechanical). The proposed procedure is applied and validated in a DGS test bench operated by Flowserve. Validation data set has been generated operating the DGS in the test bench at different conditions in terms of angular velocity and housing temperature with sCO2 as working fluid. Results have shown a good agreement with experimental data at each operating condition with extremely low computational times.
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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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