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flame stabilization

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flame stabilization

2020-9-30 · Flame stabilization in a kerosene-fueled scramjet combustor was investigated experimentally through Schlieren, flame luminosity, and wall pressure measurement, aiming to obtain better insight into combustion characteristics. Experiments were conducted in a direct-connected supersonic combustion facility with inflow conditions of Mach number 2.0, stagnation pressure 0.82 MPa, and temperature ...


2016-9-6 · To investigate the flame stabilization and propagation in a dual-mode scramjet with two-staged-strut injectors, a series of fuel dynamic adjustment experiments was conducted at the inlet Mach numbers of 2.0 and 3.0, and the corresponding inflow stagnation temperatures were 1231 and …


2020-8-10 · With the RZ present, the blow-off limits are significantly extended and the stabilization mechanism is altered. The RZ vortex shields the flame base from intense pre-heating resulting from the increase in heat loss to the flame-holder while it provides support to the


Flame stabilization by bluff-bodies has been investigated to highlight the role of recirculation zone on the phenomenon. It has been observed that close correlations exist between heat exchange from recirculation zone and flame stability as controlled by recirculation strength.


Premixed Flame Stabilization: Basic Effects • Flame stabilization: – Balance combustion wave propagation with flow velocity • Burning velocity, edge speed, autoignition front? • Suggests that stable flames are rare – However, flames have self -stabilizing mechanisms • Shear layer stabilized: Upstream flame


T1 - Flame stabilization regimes for premixed flames anchored behind cylindrical flame holders. AU - Vance, Faizan H. AU - Shoshin, Yuri. AU - de Goey, Philip. AU - van Oijen, Jeroen A.


2021-7-14 · In house and industrial applications flame stability is achieved by attaching the flame to a simple device known as a burner. Flame stabilization is usually accomplished by causing some of the combustion products to recirculate and hence to continually ignite the fuel mixture.


2012-5-23 · Flame–wall interaction effects on the flame root stabilization mechanisms of a doubly-transcritical LO2/LCH4 cryogenic flame Proceedings of the Combustion Institute, Vol. 37, No. 4 Vortex Dynamic Mechanisms in Coaxial Hydrogen/LOX Jet Flames


Flame stabilization at 1 bar At first, the flame stabilization was examined at 1 bar without changing the fuel-tube depth (ξ = 0 mm). The flame stabilization limits for the four tube combinations were compared, and the trends of the Reynolds number (Re d F = V 0 d F …


2011-1-15 · Flame stabilization and the mechanisms that govern the dynamics at the flame base of lifted flames have been subject to numerous studies in recent years. A combined Large Eddy Simulation-Conditional Moment Closure (LES-CMC) approach has been successful in predicting flame ignition and stabilization by auto-ignition, but accurate modelling of the competition between turbulent quenching …


2018-1-24 · Flame stabilization is an issue of considerable importance to turbulent combustor design. Investigation of flame stabilization mechanisms was carried out using a Nd:YAG-based PIV system. The 532 nm output of the laser was formed into a 250 micron thick light sheet and passed


2011-3-8 · Flame stabilization is an issue of considerable fundamental importance to turbulent combus- tor design. This importance is highlighted by the recent emphasis on low NO x burners, where flame stability is often adversely affected by NO x reduction strategies. Flame stabilization theories generally recognize the importance of ...


2014-1-20 · Conclusion. In this paper, a strut-jet based RBCC combustor model is tested to investigate the flame stabilization characteristic with a small rocket mass flow rate. Mach number at the entrance of the combustor is 2.6 and liquid kerosene is used to fuel the strut rocket and the second combustion. Based on the experiment results, main conclusion ...


Flame Stabilization and Emissions of a Natural Gas/Air Ceramic Porous Burner. Article Preview. Abstract: Increasingly stringent regulations for limiting pollutant emissions for both aircraft and industrial gas turbines enforce further reduction of NOx emissions while maintaining flame stability. Application of premixed flames offers the ...


2011-4-25 · A frequently employed method for aerodynamic flame stabilization in modern premixed low emission combustors is the breakdown of swirling flows; with carefully optimized tailoring of the swirler, a sudden transition in the flow field in the combustor can be achieved.


2020-10-13 · Premixed flame propagation was determined to be the mechanism controlling flame stabilization when the flame resided away from the shear layer. Recirculation of hot combustion products in the jet wake was thought to be the primary mechanism supporting flame stabilization …


Premixed flame stabilization conditions were studied with equivalence ratio and mean velocity of mixture. The effect of different environments of the heat transfer was also studied. Even though the mean velocity for stable flame had great difference depending on the combustors geometries and shapes, averaged temperature of the combustor was ...


The results obtained from this study are used to construct a regime diagram, which offers a broader view of the whole flame stabilization process and its mechanisms.", keywords = "Blow-off, Flame stabilization, Flashback, Heat loss, Recirculation zone",


2008-8-15 · Chapter 4 details the investigation of the flame stabilization mechanisms in the premixed SPRF combustor. Chapter 5 covers fuel-air mixing in the non-premixed operation of the combustor. In addition, it also includes the effect of scaling various combustor dimensions on the mixing characteristics.


Previous studies have demonstrated that multiple flame stabilization modes can be observed and a variety of combustion modes can be identified in the cavity-based scramjet under different conditions. It can be expected that the local combustion mode transition drives the overall change of the flame location because the flame moves to regions with different mixing conditions and flow velocity.


2012-5-23 · Characterization of flame stabilization modes in an ethylene-fueled supersonic combustor using time-resolved CH* chemiluminescence Proceedings of the Combustion Institute, Vol. 36, No. 2 Investigation of transient ignition processes in a model scramjet pilot cavity using simultaneous 100 kHz formaldehyde planar laser-induced fluorescence and CH ...


2008-8-15 · FLAME STABILIZATION AND MIXING CHARACTERISTICS IN A STAGNATION POINT REVERSE FLOW COMBUSTOR A Dissertation Presented to The Academic Faculty by Mohan K. Bobba In Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy in Aerospace Engineering Georgia Institute of Technology December 2007


2014-9-22 · Triple flame siructure and diffvsion flame stabilization 57 slightly downstream until a critica! valué of the velocit A¡y0i gradient ia reached, . At that point, flame stabilization is no longer possible near the splitter píate and the flame is lifted off. The critical valué at …


Flame stabilization techniques vary by engine type but typically have a bluff body to impart a recirculation zone of hot combustion gases around the fuel injectors and compressed air inlet to prevent flameout. The fuel is not premixed with the combustion air, so similar tradeoffs of NO x versus soot emissions occur as in CI. Flame conditions are quite different in a continuous flow jet engine, so engineering strategies to …


flame-stabilization patterns. Based on the previous studies on the multistaged injection, a scramjet combustor installed with the two-staged-strut injectors and a cavity flame holder were designed and


title = "Flame Stabilization and Blow-Off of Ultra-Lean H2-Air Premixed Flames", abstract = "The manner in which an ultra-lean hydrogen flame stabilizes and blows off is crucial for the understanding and design of safe and efficient combustion devices.


The flame stabilization and flammability limit map within measurement parameters are discussed. 271 Analysis of Lift off Height and Blow-Off Mechanism of Turbulent Flame by V-Gutter Bluff Body. Authors: S. Boopathi, P. Maran, V. Caleb Eugene, S. Prabhu Abstract: The experimental investigation has been carried out to study the stabilization and ...


2021-4-19 · This is of particular engineering interest in the context of low-swirl combustion, as the general theory of low-swirl flame stabilization is depicted on the basis of the balance between S T and the local flow velocity, which presumably enables the freely propagating flame to self-adjust its stabilization position in the flow field in response to different operating conditions, a feature that is critical for fuel …


2018-6-14 · A simplified analysis has been attempted on flame stabilization by bluff-body based on a physical model. The proposed theoretical model predicts with fair accuracy the experimental results of Zukoski and Marble (1956), Fetting el at. (1959) and also of the present investigation. Implications of theoretical and experimental results have been discussed.


2016-8-5 · Flame stabilization is affected by both fluid mechanical and chemical kinetic processes. For this reason, an extensive space of geometric and operational parameters, shown in Table 1, was explored and the sensitivity of flame stabilization to these parameters was observed. Flame …


2013-9-17 · flame stabilization, improved mixing, shorter, more compact flames, and reduced nitric oxides. However, even if the flame appears to be stable and is far from the blowout limit, it may undergo high-speed periodic flame motions that require high speed diagnostics to …


2010-10-1 · The basic principle was that a flame was stabilized when local flow and turbulent flame propagation velocities were equal. Furthermore, turbulent flame speed was proportional to turbulent intensity, and therefore, turbulent intensity was closely related to flame stability at the flame base.


2017-5-1 · Cavity Flame-Holders for Ignition and Flame Stabilization in Scramjets: An Overview Adela Ben-Yakarand Ronald K. Hanson† Stanford University, California 94305 This paper describes ongoing research efforts in the scramjet community on cavity ‘ ame holders, a concept for ‘ ame holding and stabilization in supersonic combustors.


ignition, flame stabilization (Liao et al., 2018), and oscillation in scramjet combustors, are still not fully comprehended despite nearly seven decades of re-search. It is the inability of measuring crucial flow properties experimentally that leads to this situation.


Flame stabilization and lift-off represent phenomena of great practical and fundamental interest. Lifted laminar flames have often been used to gain a fundamental understanding on the stabilization of turbulent lifted flames. Recent studies indicate that the leading edge of a laminar lifted flame has a tribrachial (or triple) structure, and the ...


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