scholarly journals Design of Power Turbine Flow Path of Small Aeroengine

2017 ◽  
Vol 0 (8) ◽  
Author(s):  
Sergey Alexandrovich Khomylev ◽  
Sergiy Riznyk ◽  
Artyom Karpenko
Keyword(s):  
Flow Path ◽  
Power Turbine ◽  
Turbine Flow Path

LM9000 Passive Clearance Control (PCC)

2020 ◽  
Author(s):  
Simone Marchetti ◽  
Duccio Nappini ◽  
Roberto De Prosperis ◽  
Paolo Di Sisto
Keyword(s):  
Control System ◽  
Low Pressure ◽  
Industrial Applications ◽  
Flow Path ◽  
Operating Conditions ◽  
Low Pressure Turbine ◽  
Power Turbine ◽  
Extensive Test ◽  
First Time ◽  
Clearance Control

Abstract This paper describes the design of the Free Power Turbine (FPT) of the LM9000, in particularly the design of its Passive Clearance Control (PCC) system. The LM9000 is the aero-derivative version of the GE90-115B jet engine. Its core engine has many common parts with the GE90; what differs is the booster (low pressure compressor) and the lower pressure turbine (LPT). The booster of the LM9000 is without fan because the engine is not used to provide thrust but torque only, subsequently it has a new flow path [5]. The LPT has instead been replaced by an intermediate pressure turbine (IPT) and by the FPT. The IPT drives the booster, while the FPT is a free low-pressure turbine designed for both power generation and mechanical drive industrial applications, including LNG production plants. Due to its different application, the LM9000 FPT flow path differs sensibly from the GE90 LPT, however as the GE90 it is provided of a clearance control system that cools the casing in order to reduce its radial deflection. It is not the first time that a clearance control system has been used in industrial applications; in GE aero-derivative power turbines is already present in the LM6000 and LMS100. Design constraints, system complexity, high environment variability because the PCC is located outside the GT, harsh environments and long periods of usage still make the design of this component challenging. The design of the PCC has been supported by extensive heat transfer and mechanical simulations. Each PCC component has been addressed with a dedicated life calculation and all the blade and seal clearances have been estimated for all the operating conditions of the engine. Simulations have been validated by an extensive test campaign performed on the first engine.

scholarly journals Direct Coal-Fueled Combustion Turbines

1987 ◽  
Author(s):  
Richard A. Wenglarz
Keyword(s):  
Residence Time ◽  
Flow Path ◽  
Past Experience ◽  
Short Residence Time ◽  
Combustion Emissions ◽  
Turbine Flow Path

Technology requirements for direct coal-fueled turbine systems are discussed. Combustion, emissions, and turbine life considerations are emphasized. Compact, short residence time combustors must provide acceptable combustion efficiencies and emissions using the coal fuels. The turbine flow path exposed to the products of combustion (POC) from those combustors must achieve acceptable deposition, erosion, and corrosion (DEC) lifetimes. Initial combustion and POC requirements are reviewed based on past experience and the results of a recent program to evaluate combustion, emissions, and DEC from a subscale turbine combustor.

scholarly journals Design concept of high-power supercritical CO2 Allam cycle gas turbine flow path

Vestnik IGEU ◽  
2018 ◽  
pp. 5-14
Author(s):  
A.N. Rogalev ◽  
◽  
E.Yu. Grigoryev ◽  
V.O. Kindra ◽  
S.K. Osipov ◽  
...  
Keyword(s):  
Gas Turbine ◽  
High Power ◽  
Supercritical Co2 ◽  
Flow Path ◽  
Design Concept ◽  
Turbine Flow Path

CFD Analyses and Design of a Turbocompound System

2013 ◽  
Author(s):  
Thomas Vogel ◽  
Philipp Epple ◽  
Andreas Hermann ◽  
Bettina Willinger ◽  
Antonio Delgado
Keyword(s):  
Mass Flow ◽  
High Speed ◽  
Internal Combustion Engines ◽  
High Efficiency ◽  
Guide Vane ◽  
Flow Path ◽  
Performance Criteria ◽  
Exhaust Gas ◽  
System A ◽  
Power Turbine

In a turbocompound (TC) system a turbocharged engine is coupled with an additional power turbine, which recovers exergy of the exhaust gas after the turbocharger. The gained power is added to the engine power by a gearbox and a hydrodynamic coupling. The benefit of turbocompound is that the efficiency of internal combustion engines is improved substantially.The challenge with turbocompounding is that a high speed turbine is coupled with a slow speed engine. Through the transient requirements in mobile applications the operating points of the engine are variable while the turbo machine is designed for a continuous and steady flow. Matching the components is an additional challenge in designing the flow path of a TC System. A systematic approach in which the flow path is divided into three regions is applied: the interstage duct, the power turbine consisting of the rotor and its guide vane as well as the exhaust gas collector. After defining performance criteria for the individual regions, they are analysed by computational fluid dynamics (CFD). For this purpose, the model for the CFD-simulation is validated with measurements. For the interstage duct the influence of the mass flow and the outlet swirl of the turbocharger are analysed. For the exhaust gas collector the influence of the outlet swirl and mass flow from the power turbine is evaluated by a sensitivity study. Based on verified CFD simulations as well as analytical considerations it was possible to show that an improvement of the turbine performance is still possible. Parameters to be optimized were identified. As a result of the study an improved method for high efficiency aerodynamic design of turbocompound systems was developed. Based on this method the parts of the TC system were aerodynamically optimized. The performance of the new design was verified by CFD. Improvements in the power output up to 10% were achieved in stationary engine points.

Axial Turbine Stage Design: 1D/2D/3D Simulation, Experiment, Optimization — Design of Single Stage Test Air Turbine Models and Validation of 1D/2D/3D Aerodynamic Computation Results Against Test Data

2005 ◽  
Author(s):  
Leonid Moroz ◽  
Yuri Govoruschenko ◽  
Petr Pagur
Keyword(s):  
Optimization Design ◽  
Recent Decade ◽  
Flow Path ◽  
Single Stage ◽  
3D Simulation ◽  
Test Model ◽  
Stage Design ◽  
Air Turbine ◽  
Industry Practice ◽  
Turbine Flow Path

In recent decade, industry had started to use intensively 3D simulation in turbine flow path and its components design. At the same time, this remains a very labor- and time-consumable process that sufficiently hampers its usage, whereas unidimensional and axisymmetric analyses are still widely used in the industry practice. A comparison of the data obtained from experiments conducted on a single stage air turbine test model with the results of 1D and 2D modeling and 3D simulation using a CFD solver was performed. The results were analyzed to validate a judgement of the authors that along with 3D CFD methods the low-fidelity models can be successfully used for turbine flow path optimization with the help of DoE methods. The forthcomings and advantages of different models are also discussed.

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