Modeling of natural acoustic frequencies of a gas-turbine plant combustion chamber

Zubrilin, Ivan A.; Gurakov, N. I.; Zubrilin, Roman A.; Матвеев, С. Г.

doi:10.1134/s0040601517050093

Cited by 7 publications

(3 citation statements)

References 5 publications

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“…Obviously, the rate of these transformations is not determined by the rate of mutual diffusion. Diffusion exists in the absence of combustion at the pre-flame preparation stage, when the energy of colliding molecules leads not to combustion, but to the formation of oxygen-containing compounds [44][45][46][47][48].…”

Section: Resultsmentioning

confidence: 99%

Physical and chemical processes of fuel change during ignition in diesel engine

Alatyrev

Kazakov

Vasiliev

et al. 2022

J. Phys.: Conf. Ser.

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The combustion of hydrocarbon fuels in the combustion chambers of diesel engines is preceded by processes of both physical and chemical transformations. The nature of the chemical transformations and their effect on the workflow are usually not taken into account. Meanwhile, their role in ensuring the efficiency of the workflow is very large. Chemical transformations in hydrocarbon fuels in combustion chambers cause the appearance of products capable of self-ignition under the influence of temperatures and pressures arising at the end of the compression stroke. The chain of these transformations ends with the formation of soot particles, the burning of which with abundant heat release in the form of radiant energy has a significant effect on the value of the indicator efficiency. The content and ways of influencing chemical transformations in fuel are considered, as well as the use of these transformations in increasing the combustion efficiency of fuels and increasing the indicator efficiency.

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Section: Resultsmentioning

confidence: 99%

Physical and chemical processes of fuel change during ignition in diesel engine

Alatyrev

Kazakov

Vasiliev

et al. 2022

J. Phys.: Conf. Ser.

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“…In sources, two oppositely directed processes develop in the working volume: first of all, carbonaceous objects grow due to external adhesion deposition of compounds C and H, and interaction reactions with O2 causes their fragmentation, ultimately minimizing the surface area of the carbonaceous object [18][19][20]. Therefore, experts distinguish between the so-called "young" carbonaceous object and "old" carbonaceous object, thus, as the carbonaceous object develops grows to a certain size, and then its size decreases somewhat due to gasification, and when the carbon-like object leaves the space where chemical transformations take place, its size reaches characteristic values [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Morphological properties and atomic crystal lattice of solid carbonaceous objects

Rossokhin¹,

Лопатин²,

Pushkarenko³

et al. 2022

J. Phys.: Conf. Ser.

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Diesel particulate matter (DPM) is an area of concern from an environmental point of view due to its functionality to settle in the respiratory channels when inhaled, cause inflammation in the respiratory tract, accumulate carcinogenic compounds, and adversely reflected the cardiovascular functions, thus causing excess mortality. DPM consists of an agglomeration of a numerous unions of preimages germ structures, spherical in the form of turbostratic carbon. Part of the DPM contains partially oxidized polyaromatic compounds C and H with a ring structure (PAH).

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“…The signatures of a blowout condition can be recognized in localized extinction and reignition events and irregular rates of fuel consumption. In more detail, unstable combustion is related to self-sustained combustion oscillations at or near the acoustic frequency of the combustion chamber, which are the result of the closed loop coupling between unsteady heat release and pressure fluctuations [ 3 , 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Ion Current Sensor for Gas Turbine Condition Dynamical Monitoring: Modeling and Characterization

Addabbo

Fort

Landi

et al. 2021

Sensors

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This paper aims to thoroughly investigate the potential of ion current measurements in the context of combustion process monitoring in gas turbines. The study is targeted at characterizing the dynamic behavior of a typical ion-current measurement system based on a spark-plug. Starting from the preliminary study published in a previous work, the authors propose a refined model of the electrode (spark plug), based on the Langmuir probe theory, that incorporates the physical surface effects and proposes an optimized design of the conditioning electronics, which exploits a low frequency AC square wave biasing of the electrodes and allows for compensating some relevant parasitic effects. The authors present experimental results obtained in the laboratory, which allow for the evaluation of the validity of the model and the interpreting of the characteristics of the measurement signal. Finally, measurements carried out in the field on an industrial combustor are presented. The results confirm that the charged chemical species density sensed by the proposed measurement system and related to the mean value of the output signal is an indicator of the ‘average’ combustion process conditions in terms e.g., of air/fuel ratio, whereas the high frequency spectral component of the measured signal can give information related to the turbulent regime and to the presence of pressure pulsations. Results obtained with a prototype system demonstrated an achievable resolution of about 5 Pa on the estimated amplitude, even under small biasing voltage (22.5 V) and an estimated bandwidth of 10 kHz.

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Modeling of natural acoustic frequencies of a gas-turbine plant combustion chamber

Cited by 7 publications

References 5 publications

Physical and chemical processes of fuel change during ignition in diesel engine

Physical and chemical processes of fuel change during ignition in diesel engine

Morphological properties and atomic crystal lattice of solid carbonaceous objects

Ion Current Sensor for Gas Turbine Condition Dynamical Monitoring: Modeling and Characterization

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