Integration of a Gas Model Into CFD Analysis for the Simulation of Turbine Exhaust Flows with High Steam Loads

IF 1.4 4区 工程技术 Q3 ENGINEERING, MECHANICAL
Mahmoud El-Soueidan, Marc Schmelcher, Alexander Görtz, Jannik Häßy, Marius Bröcker
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Abstract

Abstract The Water-Enhanced Turbofan (WET) is a promising future propulsion concept to reduce aero engine emissions. In the WETengine, a heat exchanger uses turbine exhaust heat in order to generate superheated steam out of liquid water. For evaporator design, CFD simulations are necessary since correlation-based predictions have a high uncertainty during preliminary design. A common way of modeling steam loaded flows is the integration of gas models into CFD analysis. However, to the author's knowledge, there is no gas model published that accounts for the exact gas composition of turbine exhaust flows with high steam loads and is commonly used by low- and high-fidelity methods. Therefore, a gas model predicting the thermodynamic behavior of the turbine exhaust flow considering high steam loads is presented and integrated into an existing CFD solver. The approach is able to incorporate the implemented gas model into the CFD simulation by two methods: runtime and offline. The offline method has a computational advantage in iteration time compared to the runtime integration. As demonstration case, a single two dimensional cylinder is considered. A variation of the steam loading of the flow shows a significant effect on local properties and therefore on local and average heat transfer. Increasing the steam loading up to 40 % results in an increase of the average Nusselt number of 17 %.
将气体模型集成到CFD分析中用于高蒸汽负荷涡轮排气流模拟
水增强型涡轮风扇(WET)是一种很有前途的未来推进概念,可以减少航空发动机的排放。在weengine中,热交换器利用涡轮排出的热量从液态水中产生过热蒸汽。对于蒸发器设计,CFD模拟是必要的,因为基于相关性的预测在初步设计时具有很高的不确定性。模拟含汽流的一种常用方法是将气体模型集成到CFD分析中。然而,据笔者所知,目前还没有发表的气体模型能够准确地解释高蒸汽负荷涡轮排气流的气体成分,并且通常被低保真度和高保真度方法所使用。因此,本文提出了一种预测高蒸汽负荷下涡轮排气流热力学行为的气体模型,并将其集成到现有的CFD求解器中。该方法能够通过运行时和离线两种方法将所实现的气体模型整合到CFD模拟中。与运行时集成相比,离线方法在迭代时间上具有计算优势。以单个二维圆柱体为例进行了分析。流动蒸汽负荷的变化对局部特性有显著影响,因此对局部和平均传热也有显著影响。将蒸汽负荷增加到40%,平均努塞尔数增加17%。
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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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