A part-load performance analysis method for gas turbines based on the stage by stages model of the power turbine
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Liping Deng
und
Qi’an Xie
Abstract
In existing calculation studies of gas turbine part-load performance, the multi-stage power turbine (PT) is usually considered as an integral whole, and the variation rule of power and efficiency of the PT’s front/rear stage with load cannot be obtained. Therefore, the 6-stage PT of LM2500+ gas turbine is divided into 2 sub-turbines to be investigated by establishing the gas turbine part-load performance model based on the stage by stages method of the power turbine in this paper. The model is used to calculate the part-load performance of the LM2500+ under the fuel flow strategy (FF) and the first sub-turbine variable area nozzle (VAN) strategy. The results show that the relative errors of the mass flow rate, pressure ratio and thermal efficiency calculated by the model compared to the experiment data are all within 3.5 %.Under the FF strategy, the degree of mismatch in PT front/rear stage gradually increases as the load decreases from 100 % to 0.0 %, with the share of the first sub-turbine power increases from 22 % to 130 %, and the second sub-turbine efficiency decreases from 0.876 to −0.126. The adoption of the VAN strategy further exacerbates the degree of mismatch between the PT front/rear stages.
Acknowledgments
The first author would like to thank Lab Associates for providing many reference on the calculation method of their research achievements.
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Research ethics: Not applicable.
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Informed consent: Not applicable.
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Author contributions: All authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Use of Large Language Models, AI and Machine Learning Tools: None declared.
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Conflict of interest: The author states no conflict of interest.
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Research funding: None declared.
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Data availability: Not applicable.
Nomenclature
Abbreviations
- C
-
compressor
- I
-
inlet
- CC
-
combustion chamber
- E
-
exhaust
- G
-
generator
- HT
-
High pressure turbine
- PT
-
power turbine
- VAN
-
variable area nozzle
- FF
-
fuel flow
- SFC
-
specific fuel consumption
Subscripts
- cor
-
corrected
- cormap
-
corrected from map
- cd
-
design point
- cr
-
critical state
- g
-
gas
- max
-
maximum
- 1S
-
Power turbine first stage
- 5S
-
The rear 5 stages of the power turbine
- FG
-
Fixed geometry
Superscripts
- -
-
relative value
Notations
- π
-
pressure ratio
- W
-
mass flow, kg/s
- η
-
efficiency
- Δθ
-
variable area nozzle angle, degree
- η T
-
thermal efficiency
- Tti
-
total temperature. i = Station 0,2,3,4,5,56,6,8
- Pti
-
total pressure. i = Station 0,2,3,4,5,56,6,8
- A 5nb
-
throat area of the power turbine guide vane
- const
-
constant
- C P
-
specific heat at constant pressure
- k ′
-
specific heat ratio
- n
-
rotor speed
- a
-
sound velocity
- r
-
radius
- R
-
gas constant
- u
-
rim speed
- λ
-
speed factor
- Kg’
-
a constant in a flow formula
- Wg
-
gas mass flow
- q(λ)
-
flow function
- σ nb
-
total pressure recovery coefficient from turbine guide inlet to throat
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© 2025 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Simulation and analysis of the over-expanded flow field in asymmetric nozzles with lateral expansion
- Design optimization of a fluidic thrust vectoring system based on coanda effect using meta-models
- Research on vibration damping of integral squeeze film damper based on fan rotor tester of turbofan
- Influence of conical shaft stiffness on the dynamic characteristics of flexible rotor
- A novel design methodology for preventing dislocation in the Zig-zag shroud
- Numerical study of effect of the casing slot on the tip leakage vortex and vortex cavitation of a fuel pump
- Multi-parameter study on array-jets impingement with crossflow temperature effect
- Exploration of shock-induced flow dynamics and turbulence-driven combustion optimization in advanced cavity configurations of hydrogen fueled scramjet combustors
- A part-load performance analysis method for gas turbines based on the stage by stages model of the power turbine
- Effect of lip-thickness on rectangular nozzle co-flowing subsonic jet
- Numerical analysis of pollutant formation and exhaust emission in a short annular combustor under part load operation
- Analysis of leakage characteristics and structural optimization of two-stage floating ring seal
- Hypersonic boundary layer flow at an axisymmetric stagnation point on a blunt body
- Numerical simulations of a turbulent lifted hydrogen flame in vitiated coflow with flamelet generated manifold approach
- Optimization of labyrinth seal leakage with independently varied tooth parameters using efficient global optimization
- Investigations of modified cooling hole injection angle configurations for improved trench film cooling performance
- Influence of non-axisymmetric endwall profiling under incoming vortex on the corner separation of a diffusion cascade
- Impact of annular ribs in sudden expansion flow conditions to control base pressure
- Effect of preheated swirling multi-annular jets on mixing and flow characteristics in various expanded confinements
Artikel in diesem Heft
- Frontmatter
- Simulation and analysis of the over-expanded flow field in asymmetric nozzles with lateral expansion
- Design optimization of a fluidic thrust vectoring system based on coanda effect using meta-models
- Research on vibration damping of integral squeeze film damper based on fan rotor tester of turbofan
- Influence of conical shaft stiffness on the dynamic characteristics of flexible rotor
- A novel design methodology for preventing dislocation in the Zig-zag shroud
- Numerical study of effect of the casing slot on the tip leakage vortex and vortex cavitation of a fuel pump
- Multi-parameter study on array-jets impingement with crossflow temperature effect
- Exploration of shock-induced flow dynamics and turbulence-driven combustion optimization in advanced cavity configurations of hydrogen fueled scramjet combustors
- A part-load performance analysis method for gas turbines based on the stage by stages model of the power turbine
- Effect of lip-thickness on rectangular nozzle co-flowing subsonic jet
- Numerical analysis of pollutant formation and exhaust emission in a short annular combustor under part load operation
- Analysis of leakage characteristics and structural optimization of two-stage floating ring seal
- Hypersonic boundary layer flow at an axisymmetric stagnation point on a blunt body
- Numerical simulations of a turbulent lifted hydrogen flame in vitiated coflow with flamelet generated manifold approach
- Optimization of labyrinth seal leakage with independently varied tooth parameters using efficient global optimization
- Investigations of modified cooling hole injection angle configurations for improved trench film cooling performance
- Influence of non-axisymmetric endwall profiling under incoming vortex on the corner separation of a diffusion cascade
- Impact of annular ribs in sudden expansion flow conditions to control base pressure
- Effect of preheated swirling multi-annular jets on mixing and flow characteristics in various expanded confinements
