Comparison of combustion instabilities found in various types of combustion chambers

Barrère, M.; Williams, Forman A.

doi:10.1016/s0082-0784(69)80401-7

Cited by 48 publications

(14 citation statements)

References 14 publications

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“…A useful distinction between the different types is made in [158] in which the instabilities have been defined as falling into three main classes:…”

Section: Combustion Associated Instability In Pumping Systemsmentioning

confidence: 99%

The Stability of Pumping Systems—The 1980 Freeman Scholar Lecture

Greitzer

1981

Journal of Fluids Engineering

285

131

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A review is presented of the types of instabilities which are encountered in pumping systems of technological interest. These include axial and centrifugal compression systems, pumping systems involving cavitation, systems with two-phase flow, systems with combustion, hydraulic systems, and systems which have two or more pumping elements in parallel. All of the above will be seen to exhibit instabilities under certain operating conditions, although the mechanism of instability, as well as the particular system element that is responsible for the instability, will be quite different in the different systems. However, several basic concepts, such as the idea of negative damping which is associated with dynamic instability, will be seen to be common to the different systems. The review is organized around the different types of systems that are discussed, and includes descriptions of the steady-state performance, the regimes in which one would expect instability, and the mechanisms of instability. An idealized pumping system is first examined to illustrate some of the basic concepts. More realistic systems are then treated in the same manner of showing steady-state performance, regimes of instability and mechanisms. In the review attention is given mainly to those areas in which there is high current engineering interest, and an attempt is made to describe those areas of research which can be most fruitfully pursued. In general, it is suggested that efforts should be directed toward obtaining an improved understanding of the transient behavior of the active (instability causing) elements within the system, since it is lack of knowledge of this aspect that currently limits the accuracy of system stability predictions.

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“…A useful distinction between the different types is made in [158] in which the instabilities have been defined as falling into three main classes:…”

Section: Combustion Associated Instability In Pumping Systemsmentioning

confidence: 99%

The Stability of Pumping Systems—The 1980 Freeman Scholar Lecture

Greitzer

1981

Journal of Fluids Engineering

285

131

View full text Add to dashboard Cite

show abstract

“…Studies of combustion instabilities and noise are numerous [24,26,[44][45][46][47][48][49][50][51][52][53] and started long ago [41] . A ame is not needed to produce such coupling: as shown by Rijke [54,55] , a heated gauze placed in a tube is enough to produce a "singing" tube caused by the coupling between the acoustic modes of the duct and the unsteady heat released by the gauze [56,57] .…”

Section: Introductionmentioning

confidence: 99%

Prediction and control of combustion instabilities in real engines

Poinsot

2017

Proceedings of the Combustion Institute

593

216

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This is an author-deposited version published in: http://oatao.univ-toulouse.fr/ Eprints ID: 17713Open Archive Toulouse Archive Ouverte (OATAO) OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. To cite this version: AbstractThis paper presents recent progress in the eld of thermoacoustic combustion instabilities in propulsion engines such as rockets or gas turbines. Combustion instabilities have been studied for more than a century in simple laminar con gurations as well as in laboratory-scale turbulent ames. These instabilities are also encountered in real engines but new mechanisms appear in these systems because of obvious differences with academic burners: larger Reynolds numbers, higher pressures and power densities, multiple inlet systems, complex fuels. Other differences are more subtle: real engines often feature speci c unstable modes such as azimuthal instabilities in gas turbines or transverse modes in rocket chambers. Hydrodynamic instability modes can also differ as well as the combustion regimes, which can require very different simulation models. The integration of chambers in real engines implies that compressor and turbine impedances control instabilities directly so that the determination of the impedances of turbomachinery elements becomes a key issue. Gathering experimental data on combustion instabilities is dif cult in real engines and large Eddy simulation (LES) has become a major tool in this eld. Recent examples, however, show that LES is not suf cient and that theory, even in these complex systems, plays a major role to understand both experimental and LES results and to identify mitigation techniques.

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“…Barreré and Williams [2] classified these instabilities as intrinsic instability, acoustic instability, shock instability, and fluid-dynamic instability. Fluid dynamic instability, which arises due to vortex shedding, usually from a bluff body flameholder, is relevant to the present study.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Combustion Instability in a V-Gutter Stabilized Combustor

Sundaram¹,

Babu

2013

Journal of Engineering for Gas Turbines and Power

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The stability of the combustion process in a V-gutter stabilized combustor is numerically investigated. To this end, 3D compressible turbulent and unsteady reacting flow calculations have been carried out using LES. The time history of the pressure at several locations is used to determine the frequency and amplitude of the oscillations along with the mode shapes. A shift in the dominant mode of the frequency spectra from the acoustic mode to the hydrodynamic mode is observed. A POD analysis of pressure time histories on the symmetry plane also corroborates this trend. The computational domain is divided into several subvolumes in the wake region of the V-gutter and the time histories of pressure, temperature, and heat release are collected in the individual volumes. It is seen that the fluctuation of pressure and heat release tend to oscillate from being in phase to out of phase over a time period. Unstable regions predicted by the Rayleigh index across a plane are shown to be different from those predicted in a volume owing to the three dimensionality of the flame. Quite interestingly, the calculated values of the indices show the combustor to be most unstable for an equivalence ratio of 0.1665 which is not the leanest one considered here. The global Rayleigh index is shown to correlate well with the amplitude of the dominant mode.

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Comparison of combustion instabilities found in various types of combustion chambers

Cited by 48 publications

References 14 publications

The Stability of Pumping Systems—The 1980 Freeman Scholar Lecture

The Stability of Pumping Systems—The 1980 Freeman Scholar Lecture

Prediction and control of combustion instabilities in real engines

Numerical Investigation of Combustion Instability in a V-Gutter Stabilized Combustor

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