The Impact of Thermodynamic Properties of Air-Water Vapor Mixtures on Design of Evaporative Gas Turbine Cycles

2001 ◽  
Author(s):  
Farnosh Dalili ◽  
Martin Andrén ◽  
Jinyue Yan ◽  
Mats Westermark
Keyword(s):  
Water Vapor ◽  
Thermodynamic Properties ◽  
Thermodynamic Property ◽  
Gas Turbine ◽  
Gas Mixture ◽  
Real Gas ◽  
The Real ◽  
Property Data ◽  
Vapor Mixtures ◽  
The Impact

Reliable thermodynamic property data for air-water vapor mixtures are lacking for the design of evaporative gas turbine cycles (EvGT). Due to high working pressures and temperatures of gas turbines, considerable error would occur when applying the ideal models instead of the real gas mixture models. This paper presents an extensive literature study regarding models for computing thermodynamic property data of gas mixtures. The Hyland and Wexler model is found to be the best available despite the limited temperature range. However, experimental data are needed to verify the extrapolation. Furthermore, this paper evaluates the impact of thermodynamic properties of air-water vapor mixtures on the design of EvGT cycles. A suggested EvGT configuration, with results based on ideal gas mixture model and steam tables, is selected as a reference. The real properties of the working fluid mixture are recalculated by the means of the Hyland and Wexler model and applied in the cycle calculation. The results based on real data are compared to those based on ideal. The results show that the real gas model predicts higher saturation humidity at a given temperature. The higher volatility of water improves the humidification performance. In the case studied here, the flue gas temperature is lowered by about 3°C and the cycle efficiency is improved only marginally. The real gas model predicts higher heat duty for superheating of moist air by about 10 percent, or 2 MW. Finally, it can be concluded that thermodynamic property data mainly affect component sizing, especially the humid air superheater and to some extent the boiler.

Hybrid Modeling of Heavy Duty Gas Turbines for On-Line Performance Monitoring

2014 ◽  
Author(s):  
Thomas Palmé ◽  
Francois Liard ◽  
Dan Cameron
Keyword(s):  
Gas Turbine ◽  
Surrogate Model ◽  
Gas Turbines ◽  
Performance Monitoring ◽  
Performance Model ◽  
Heavy Duty ◽  
Operational Parameters ◽  
Actual Performance ◽  
Real Gas ◽  
The Real

Due to their complex physics, accurate modeling of modern heavy duty gas turbines can be both challenging and time consuming. For online performance monitoring, the purpose of modeling is to predict operational parameters to assess the current performance and identify any possible deviation between the model’s expected performance parameters and the actual performance. In this paper, a method is presented to tune a physical model to a specific gas turbine by applying a data-driven approach to correct for the differences between the real gas turbine operation and the performance model prediction of the same. The first step in this process is to generate a surrogate model of the 1st principle performance model through the use of a neural network. A second “correction model” is then developed from selected operational data to correct the differences between the surrogate model and the real gas turbine. This corrects for the inaccuracies between the performance model and the real operation. The methodology is described and the results from its application to a heavy duty gas turbine are presented in this paper.

The Impact of Gas Modeling in the Numerical Analysis of a Multistage Gas Turbine

2008 ◽  
Vol 130 (2) ◽  
Author(s):  
Filippo Rubechini ◽  
Michele Marconcini ◽  
Andrea Arnone ◽  
Massimiliano Maritano ◽  
Stefano Cecchi
Keyword(s):  
Gas Turbine ◽  
Flow Direction ◽  
Three Dimensional ◽  
Navier Stokes ◽  
Ratio Distribution ◽  
Real Gas ◽  
Turbine Performance ◽  
Wall Boundary Conditions ◽  
Heavy Duty Gas Turbine ◽  
The Impact

In this work a numerical investigation of a four stage heavy-duty gas turbine is presented. Fully three-dimensional, multistage, Navier-Stokes analyses are carried out to predict the overall turbine performance. Coolant injections, cavity purge flows, and leakage flows are included in the turbine modeling by means of suitable wall boundary conditions. The main objective is the evaluation of the impact of gas modeling on the prediction of the stage and turbine performance parameters. To this end, four different gas models were used: three models are based on the perfect gas assumption with different values of constant cp, and the fourth is a real gas model which accounts for thermodynamic gas properties variations with temperature and mean fuel∕air ratio distribution in the through-flow direction. For the real gas computations, a numerical model is used which is based on the use of gas property tables, and exploits a local fitting of gas data to compute thermodynamic properties. Experimental measurements are available for comparison purposes in terms of static pressure values at the inlet∕outlet of each row and total temperature at the turbine exit.

Advanced Modeling of Fluid Thermodynamic Properties for Gas Turbine Performance Simulation

2008 ◽  
Author(s):  
Vishal Sethi ◽  
Fulvio Diara ◽  
Sina Atabak ◽  
Anthony Jackson ◽  
Arjun Bala ◽  
...  
Keyword(s):  
Thermodynamic Properties ◽  
Gas Turbine ◽  
Fluid Model ◽  
Simulation Software ◽  
Working Fluid ◽  
Performance Simulation ◽  
Turbine Performance ◽  
Fluid Properties ◽  
Convergence Problems ◽  
The Impact

This paper describes the structure of an advanced fluid thermodynamic model which has been developed for a novel advanced gas turbine simulation environment called PROOSIS. PROOSIS (PRopulsion Object Oriented SImulation Software) is part of the VIVACE-ECP (Value Improvement through a Virtual Aeronautical Collaborative Enterprise - European Cycle Programme) project. The main objective of the paper is to determine a way to achieve an accurate, robust and reliable fluid model. The results obtained demonstrate that accurate modeling of the working fluid is essential to avoid convergence problems of the thermodynamic functions thereby increasing the accuracy of calculated fluid properties. Additionally, the impact of accurately modeling fuel thermodynamic properties, at the point of the injection, is discussed.

scholarly journals First-principles and CALPHAD-type study of the Ir-Mo and Ir-W systems

2020 ◽  
Vol 56 (1) ◽  
pp. 109-118 ◽  
Author(s):  
Y.-Y. Huang ◽  
B. Wu ◽  
F. Li ◽  
L.-L. Chen ◽  
Z.-X. Deng ◽  
...  
Keyword(s):  
Experimental Data ◽  
Thermodynamic Properties ◽  
Thermodynamic Property ◽  
Phase Equilibria ◽  
First Principles ◽  
Critical Evaluation ◽  
Intermetallic Phases ◽  
First Principles Calculations ◽  
Property Data ◽  
Self Consistent

This study presents the thermodynamic modeling of the Ir-Mo and Ir-W systems by means of the CALPHAD (CALculation of PHAse Diagrams) approach supported with the first-principles calculations. A critical evaluation of the phase equilibria and the thermodynamic property data in literature was conducted for both systems. Due to the lack of experimental data, the first-principles calculations were applied to obtain the enthalpies of the solid and intermetallic phases. The thermodynamic parameters were assessed using the PARROT module of Thermo-Calc. A set of self-consistent parameters for the Ir-Mo and Ir-W systems was obtained after the optimization. Satisfactory agreement between the calculated results and the experimental data, including phase equilibria and thermodynamic properties was achieved.

scholarly journals Thermodynamic properties calculation of air – water vapor mixtures thermal plasmas

2018 ◽  
Vol 24 (1) ◽  
pp. 37
Author(s):  
A.K. Kagoné ◽  
N. Kohio ◽  
W.C. Yaguibou ◽  
Z. Koalaga ◽  
F. Zougmoré
Keyword(s):  
Water Vapor ◽  
Thermodynamic Properties ◽  
Thermal Plasmas ◽  
Vapor Mixtures

Thermodynamic Properties of Gas Mixtures Encountered in Gas-Turbine and Jet-Propulsion Processes

1948 ◽  
Vol 15 (4) ◽  
pp. 349-361
Author(s):  
Joseph Kaye
Keyword(s):  
Water Vapor ◽  
Thermodynamic Properties ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Large Range ◽  
Hydrocarbon Fuel ◽  
Gas Mixtures ◽  
Average Error ◽  
Tabular Data ◽  
Jet Propulsion

Abstract The presentation of data for gas mixtures on a molal basis reduces greatly the number of gas tables required for calculations of processes in a wide variety of mixtures. This simplification of the tabular data is illustrated in detail by consideration of several gas mixtures and of the processes encountered in the design of gas turbines. Three tables of products of combustion of a hydrocarbon fuel with air are sufficient to permit calculations of all processes of interest, with an average error of about 0.1 per cent over a large range of hydrogen-carbon ratios of the fuel and over the range of fuel-air ratios for lean mixtures. Furthermore, these three tables may be used with the same error for calculations involving mixtures of air and octane vapor as well as for mixtures of air and water vapor.

Relative Effects of Velocity- and Mixture-Coupling in a Thermoacoustically Unstable, Partially-Premixed Flame

2021 ◽  
Author(s):  
Ashwini Karmarker ◽  
Jacqueline O’Connor ◽  
Isaac Boxx
Keyword(s):  
Gas Turbine ◽  
Equivalence Ratio ◽  
Premixed Flame ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Real Gas ◽  
Planar Laser ◽  
Partially Premixed ◽  
Partially Premixed Flame ◽  
The Impact

Abstract Combustion instability, which is the result of a coupling between combustor acoustic modes and unsteady flame heat release rate, is a severely limiting factor in the operability and performance of modern gas turbine engines. This coupling can occur through different coupling pathways, such as flow field fluctuations or equivalence ratio fluctuations. In realistic combustor systems, there are complex hydrodynamic and thermo-chemical processes involved, which can lead to multiple coupling pathways. In order to understand and predict the mechanisms that govern the onset of combustion instability in real gas turbine engines, we consider the influences that each of these coupling pathways can have on the stability and dynamics of a partially-premixed, swirl-stabilized flame. In this study, we use a model gas turbine combustor with two concentric swirling nozzles of air, separated by a ring of fuel injectors, operating at an elevated pressure of 5 bar. The flow split between the two streams is systematically varied to observe the impact on the flow and flame dynamics. High-speed stereoscopic particle image velocimetry, OH planar laser-induced fluorescence, and acetone planar laser-induced fluorescence are used to obtain information about the velocity field, flame, and fuel-flow behavior, respectively. Depending on the flow conditions, a thermoacoustic oscillation mode or a hydrodynamic mode, identified as the precessing vortex core, is present. The focus of this study is to characterize the mixture coupling processes in this partially-premixed flame as well as the impact that the velocity oscillations have on mixture coupling. Our results show that, for this combustor system, changing the flow split between the two concentric nozzles can alter the dominant harmonic oscillation modes in the system, which can significantly impact the dispersion of fuel into air, thereby modulating the local equivalence ratio of the flame. This insight can be used to design instability control mechanisms in real gas turbine engines.

Thermodynamic Property Models for the Simulation of Advanced Wet Cycles

2003 ◽  
Author(s):  
J. Yan ◽  
X. Ji ◽  
M. Jonsson
Keyword(s):  
Thermodynamic Properties ◽  
Thermodynamic Property ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Performance Test ◽  
Elevated Pressure ◽  
Working Fluid ◽  
Water Mixture ◽  
Water Addition ◽  
Cycle Systems

Advanced gas turbine cycles with water or steam addition (i.e., wet cycles) have attracted much interest in recent years and some commercial systems are available. Because water is added into different points of a gas turbine depending on the methods of water addition, the working fluid of gas turbine has been changed to air-water (humid air) mixture at elevated pressure. Thus, the thermodynamic properties of working fluid are different as conventional gas turbines. Accurate calculation models for thermodynamic properties of air-water mixture are of importance for process simulation, and traceable performance test of turbomachinery and heat exchangers in the wet cycle systems. However, the impacts of thermodynamic properties on the simulation of systems and their components have been overlooked. This paper is to present our study and provide a comprehensive comparison of exiting thermodynamic models of air-water mixtures. Different models including ours have been used to calculate some components including compressor, humidification tower, heat exchanger etc. in wet cycles for investigating the impacts of thermodynamic properties on the system performance. It reveals that a careful selection of thermodynamic property model is crucial for the design of cycles. This paper will provide a useful tool for predicting the performance of the system and design of the wet cycle components and systems.

Tetrafluoromethane: Thermodynamic Properties of the Real Gas.

1966 ◽  
Vol 11 (3) ◽  
pp. 383-388 ◽  
Author(s):  
R. H. Harrison ◽  
D. R. Douslin
Keyword(s):  
Thermodynamic Properties ◽  
Real Gas ◽  
The Real
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