Turbine Burners: Performance Improvement and Challenge of Flameholding

Sirignano, William A.; Dunn‐Rankin, Derek; Liu, Feng; Colcord, Ben J.; Puranam, Srivatsava

doi:10.2514/1.j051562

Cited by 21 publications

(7 citation statements)

References 52 publications

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“…We have computational results that encourage us to believe that ignition and flame-holding is achievable in the high-acceleration flow of a turbine burner: A recent review [39] shows that experimental evidence also exists. It should be possible with the use of cavities to obtain the necessary residence times.…”

Section: Discussionmentioning

confidence: 94%

Turbine-Burner Model: Cavity Flameholding in a Converging, Turning Channel Flow

Colcord¹,

Sirignano²,

Liu³

2012

48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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A review of turbine-burner research and a discussion of some relevant background issues for this emerging technology are presented. The thermal cycle analysis for augmentative combustion in the passages of the turbine on a turbojet or turbofan engine is discussed, identifying the potential for dramatic improvements in engine performance. The substantial challenges of augmentative combustion integrated with the turbine function are outlined, including the need for flame stabilization in accelerating flows at the 10 5 g levels. Research findings on reacting mixing layers in accelerating flows and flameholding in high-speed flows are reviewed. Descriptions are given of various types of compact combustors which can be used as main combustors or augmentative combustors between turbine stages. An overview is given of recent computational research at UCI on the stabilization of flames in accelerating and turning flows. Two-dimensional computations for Reynolds-averaged turbulent flow through straight and turning channels are discussed. Quasi-two-dimensional representations of reacting, converging (and converging/ turning) channel flows are examined. Two-and three-dimensional computations for time-dependent transitional flows through passages are given for cases with and without cavities. Rossiter modes, found only for the non-reacting cases, are discussed. Various configurations for injection of fuel and air into the cavity are examined. Cavity placements on the inside and outside of the turn are studied to provide different centrifugal accelerations. Some indications for optimizing the cavity design are presented. Effects of the cavity length and depth, injection orientation for fuel and air into the cavity, passage turning radius, and Reynolds number magnitude are discussed. Various hydrodynamic instabilities associated with mixing and combustion in accelerating, turning flows are evaluated, and the needs for future work are identified.

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Section: Discussionmentioning

confidence: 94%

Turbine-Burner Model: Cavity Flameholding in a Converging, Turning Channel Flow

Colcord¹,

Sirignano²,

Liu³

2012

48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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“…Swirl induced in an ultra-compact combustor allows a reduction in axial length up to 50 % compared to conventional systems [7,8]. Turbine burners also benefit from the centrifugal effect up to 10 5 g due to swirl [9] and can potentially reduce nitride oxide formation and specific fuel consumption [10]. However, as in the curved channel experiment, with swirl technologies the centrifugal field increases with relative flow velocity which leads to reduced residence time and other problems, such as combustion instabilities [11][12][13].…”

Section: Fig 1 Concept Of a Rim-rotor Rotary Ramjet Engine (R4e)mentioning

confidence: 97%

High-g Field Combustor of a Rim-Rotor Rotary Ramjet Engine

Rancourt¹,

Picard²,

Plante³

et al. 2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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High-g field combustion such as in rotary ramjet engines is a promising approach to reduce nitride oxides and combustor size by taking advantage of the flame acceleration due to the buoyancy of the products over the reactants. This paper presents a high-g field combustor design for a rim-rotor rotary ramjet engine. In this device, a premixed flow of air and fuel is ignited in the non-rotating inlet track and then swallowed and stabilized in the rotating combustion chamber. Outboard ignition frees the rotating structure from igniters, increasing the maximal tangential speed of the engine and thus its maximal efficiency. The rotating combustor design benefits from extreme centrifugal fields (10 5 to 10 7 g's) for both stabilizing the flame during ignition and maximize flame velocity. A simple buoyancy-driven combustion model allows estimating the combustor length and shows good agreement with numerical simulations, which demonstrate a combustion efficiency to be higher than 85%, even with some reactants bypassing the flameholder. Experiments demonstrate ignition at tangential speeds from 250 to 380 m/s, combustion efficiency from 60 to 75 % up to a centrifugal acceleration of 7×10 5 g, and positive indicated power.

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“…As shown by Ramakrishnan and Edwards [191] , dividing an overall process into smaller segments can improve thermodynamic efficiency by limiting temperature excursions. Sirignano, et al [193] explored similar interturbine-burner (ITB) concepts to distribute the combustion between gas-turbine stages and improve overall efficiency. Of course, there are also prices to be paid for adding complexity and increasing parasitic losses such as pressure drop.…”

Section: Segmented Reactorsmentioning

confidence: 99%

Process intensification in the catalytic conversion of natural gas to fuels and chemicals

Kee

Karakaya

Zhu

2017

Proceedings of the Combustion Institute

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This paper explores alternative technologies for the conversion of natural gas to higher-value products. Because of methane's chemical stability, all practical processes require elevated temperature (e.g., T > 700 °C) and catalysts to activate the methane. Some approaches are mature and widely practiced at the commercial scale (e.g., steam reforming and Fischer-Tropsch synthesis). Others are emerging, based on laboratory-scale experimentation (e.g., oxidative coupling of methane). In all cases, the present paper is concerned with aspects of process intensification, seeking chemical methods and reactor implementations that can improve overall performance. Performance metrics include reactor size, energy efficiency, conversion rates, and product selectivity. Process intensification approaches include integrated microchannel reactors and heat exchangers as well as a range of permselective membranes.

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Turbine Burners: Performance Improvement and Challenge of Flameholding

Cited by 21 publications

References 52 publications

Turbine-Burner Model: Cavity Flameholding in a Converging, Turning Channel Flow

Turbine-Burner Model: Cavity Flameholding in a Converging, Turning Channel Flow

High-g Field Combustor of a Rim-Rotor Rotary Ramjet Engine

Process intensification in the catalytic conversion of natural gas to fuels and chemicals

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