Fanno Design of Blow-Off Lines in Heavy Duty Gas Turbine

Cioffi, M.; Puppo, Enrico; Silingardi, Andrea

doi:10.1115/gt2013-95024

Cited by 6 publications

(6 citation statements)

References 14 publications

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“…The designer must therefore, carefully assess what methods to choose, whether it's a CFD or the theoretical equation. As mentioned in the example reference by Marco Cioffi (2013) [2], "Blow-off lines are installed to avoid dangerous flow instabilities during start-up and shut-downs." S.M.…”

Section: Discussionmentioning

confidence: 99%

“…An example highlighting the importance of Fanno flow conditions is given in a paper by Marco Cioffi (2013) [2]; blow-off lines in axial gas turbines are analyzed by adopting an adiabatic quasione-dimensional model of the gas flow through a pipe with a constant cross-sectional area and involving geometrical singularities (Fanno flow). Blow-off lines are installed to avoid dangerous flow instabilities during start-up and shut-downs.…”

Section: High Pressure Flow In Pipes -Gas Dynamicsmentioning

confidence: 99%

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Split Second Analysis Covering High Pressure Gas Flow Dynamics At Pipe Outlet – Mathematical / CFD Investigation.

Hasan¹

2015

AEIJ

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A detailed investigation covering piped gas flow characteristics in high pressure flow conditions. Such flow analysis can be resolved using established mathematical equations known as the Fanno condition, which usually cover steady state, or final flow conditions. However, in real life, such flow conditions are transient, varying with time. This paper uses CFD analysis providing a split second "snapshot" at what happens at the pipe outlet, and therefore, a closer understanding at what happens at the pipe's outlet in high pressure gas flow condition. In this example air was selected for simulation purposes. In HVAC applications, such gas flow conditions can occur in typical applications such as; air compressors releasing high pressure air through a pipe, or compressor over pressure refrigerant gas being released into the atmosphere via a discharge pipe. Investigation has shown that rather than a steady mass flow rate condition occurring at the pipe outlet, calculated by the Fanno flow condition, a spiked increase in flow rate occurs at the beginning,and then stabilizing after a few seconds, with relatively minor ripples in flow rate. Other observations were also made and commented. CFD results in mass flow rate were compared with the mathematically derived results, differences were recorded. The CFD analysis showed how the k-omega turbulence model performed well, with the processor stabilizing at an early stage.

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Section: Discussionmentioning

confidence: 99%

Section: High Pressure Flow In Pipes -Gas Dynamicsmentioning

confidence: 99%

Split Second Analysis Covering High Pressure Gas Flow Dynamics At Pipe Outlet – Mathematical / CFD Investigation.

Hasan¹

2015

AEIJ

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“…In all the presented simulations, mixing planes with non-reflecting boundary conditions (Giles [17,18]) have been adopted to couple consecutive rows. A local matching interface was used between the last stator and the OGV since they share the same blade count [6,19].…”

Section: Boundary Conditionsmentioning

confidence: 99%

Retrofittable Solutions Capability for Gas Turbine Compressors

Ricci

Mosele

Benvenuto

et al. 2022

IJTPP

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The increasing introduction of renewable energy capacity has changed the perspective on the operation of conventional power plants, introducing the necessity of reaching extreme off-design conditions. There is a strong interest in the development and optimization of technologies that can be retrofitted to an existing power plant to enhance flexibility as well as increase performance and lower emissions. Under the framework of the European project TURBO-REFLEX, a typical F-class gas turbine compressor designed and manufactured by Ansaldo Energia has been studied. Numerical analyses were performed using the TRAF code, which is a state-of-the-art 3D CFD RANS/URANS flow solver. In order to assess the feasibility of lower minimum environmental load operation, by utilizing a reduction in the compressor outlet mass-flow rate, with a safe stability margin, two different solutions have been analyzed: blow-off extractions and extra-closure of Variable Inlet Guide Vanes. The numerical steady-state results are compared and discussed in relation to an experimental campaign, which was performed by Ansaldo Energia. The purpose is to identify the feasibility of the technologies and implementation opportunity in the existing thermal power plant fleet.

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“…In all the presented simulations, mixing planes with non-reflecting boundary conditions (Giles [8,9]) have been adopted to couple consecutive rows. A local matching interface was used between the last stator and the OGV since they share the same blade count [4,3].…”

Section: Boundary Conditionsmentioning

confidence: 99%

Retrofittable Solutions Capability for a Gas Turbine Compressor

Ricci

Pacciani

Marconcini

et al. 2021

European Conference on Turbomachinery Fluid Dynamics and Thermodynamics

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The increasing introduction of renewable energy capacity has changed the perspective of operation of conventional power plants introducing the necessity of reaching extreme off-design conditions. There is a strong interest in the development and optimization of technologies, that can be retrofitted to an existing power plant to enhance flexibility, as well as increase performance and lower emissions. Under the framework of the European project TURBO-REFLEX, a typical F-class gas turbine compressor designed and manufactured by Ansaldo Energia has been studied. Numerical analyses were performed using the TRAF code, which is a state-of-the-art 3D CFD RANS/URANS flow solver. In order to assess the feasibility of lower Minimum Environmental Load operation, by utilizing a reduction in the compressor outlet mass-flow rate, with a safe stability margin, two different solutions have been analysed: blow-off extractions and extra-closure of Variable Inlet Guide Vanes. The numerical steady-state results are compared and discussed to an experimental campaign, which was performed by Ansaldo Energia. The purpose is to identify feasibility of the technologies and implementation opportunity in the existing thermal power plant fleet.

show abstract

Fanno Design of Blow-Off Lines in Heavy Duty Gas Turbine

Cited by 6 publications

References 14 publications

Split Second Analysis Covering High Pressure Gas Flow Dynamics At Pipe Outlet – Mathematical / CFD Investigation.

Split Second Analysis Covering High Pressure Gas Flow Dynamics At Pipe Outlet – Mathematical / CFD Investigation.

Retrofittable Solutions Capability for Gas Turbine Compressors

Retrofittable Solutions Capability for a Gas Turbine Compressor

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