Dynamic characteristics of a resonant gas-dynamic system for ignition of a fuel mixture

Aref’ev, K. Yu.; Voronetskiĭ, A. V.; Ilchenko, M. A.

doi:10.1134/s0010508213060038

Cited by 13 publications

(4 citation statements)

References 2 publications

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“…This signal spectrum can correspond to two different oscillation processes caused by the combustion process. In the first case, sustained self-oscillations may occur [58], when the generation of vibrational energy due to the heat release process is compensated by its dissipation in the volume of a constant cross-section channel, as well as by the removal of acoustic energy through the boundary surfaces that limit its volume. The realization in time of such oscillatory process in a constant cross-section channel at a frequency f ≈ 43 Hz should have the form of a harmonic signal with a practically constant amplitude.…”

Section: Experimental Results and Their Analysismentioning

confidence: 99%

Experimental Study of Methane Combustion Efficiency in a High-Enthalpy Oxygen-Containing Flow

2022

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The article presents the experimental study analysis results of the methane combustion efficiency in a high-enthalpy oxygen-containing flow (HOF) inside of constant cross-section channel, finite along the length. The range of initial HOF enthalpies was considered from 350 to 700 kJ/kg. The regularities of the HOF initial enthalpy influence on the methane combustion efficiency were obtained. The values of the fuel excess coefficient under which the maximum coefficients of methane combustion completeness in the HOF are realized were determined. The data obtained indicate the realization of transitional diffusion-kinetic modes of methane combustion and make it possible to assess the factors limiting the combustion process.

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Section: Experimental Results and Their Analysismentioning

confidence: 99%

Experimental Study of Methane Combustion Efficiency in a High-Enthalpy Oxygen-Containing Flow

2022

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“…Due to the possibility of reaching high temperatures (up to 1600 K [40]) and the rate of temperature growth (up to 160 K/ms [41]), the resonance effect is widespread in warhead detonation systems [42] and rocket engine fuel ignition systems [43][44][45]. In addition, it is used to generate electricity based on the utilization of temperature differences created by thermoelectric elements [46]; thermal desorption [47]; and magnetohydrodynamic energy conversion [48].…”

Section: Existing Developmentsmentioning

confidence: 99%

Hartmann–Sprenger Energy Separation Effect for the Quasi-Isothermal Pressure Reduction of Natural Gas: Feasibility Analysis and Numerical Simulation

Belousov,

Lushpeev,

Sokolov

et al. 2024

Energies

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The present paper provides a brief overview of the existing methods for energy separation and an analysis of the possibility of the practical application of the Hartmann–Sprenger effect to provide quasi-isothermal pressure reduction of natural gas at the facilities within a gas transmission system. The recommendations of external authors are analyzed. A variant of a quasi-isothermal pressure regulator is proposed, which assumes the mixing of flows after energy separation. Using a numerical simulation of gas dynamics, it is demonstrated that the position of the resonators can be determined on the basis of calculations of the structure of the underexpanded jet without taking into account the resonator and, accordingly, without the need for time-consuming calculations of the dynamics of the processes. Based on the results of simulating the gas dynamics of two nozzle–resonator pairs installed in a single flow housing, it is shown that, in order to optimize the regulator length, the width of the passage between the two nearest resonators should be greater than or equal to the sum of diameters of the critical sections of the nozzles. Numerical vibroacoustic analysis demonstrated that the most dangerous part of the resonator is the frequency of its natural oscillations.

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“…The evergrowing research of the Hartmann effect in the last half-century, as described in Raman and Srinivasan, 15 can be attributable to, at least, two factors. Firstly, the phenomenon is widely used in different engineering applications, of which we will mention the production of ultrasound, the use of the Hartmann tubes (powered resonance tubes) in active flow control technologies, 16 , 17 and, last but not least, as ignition devices in rocket engines (see, for example, literature 18–20 ). Secondly, the physical problem of the Hartmann resonator represents a problem in multidimensional (say, ten-dimensional) space of the control parameters (the jet flow parameters and the design geometry).…”

Section: Introductionmentioning

confidence: 99%

Self-oscillatory flow in the Hartmann resonator – Numerical simulation

Lebedev

Bocharova

2020

International Journal of Aeroacoustics

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Self-oscillatory flow in the Hartmann resonator is numerically calculated within the framework of ideal (inviscid and non-heat-conducting) gasdynamics. The calculations are performed for the case of a sonic jet impinging on a tube varying from that with a sealed inlet (rod) to a fairly deep cavity. The spacing between the tube and the nozzle and the nozzle pressure ratio are also varied in the calculations. On the basis of the calculated results the oscillation process is described in detail and its mechanism is revealed for both shallow and deep tubes. For shallow tubes and a rod it is due to an imbalance in the flow rate and momentum between two regions in the jet that impinges on the obstacle. For deep tubes the oscillations are due to the tube filling and evacuation somewhat reminiscent of the process occurring in a one-quarter-wave resonator. In any case no signature of a feedback loop in the external acoustic field of the jet was detected. The results of the calculations are in good agreement with experimental data. The effects of mounting a lip on the tube (transition from a low- to high-frequency operation mode) and heating in the Hartmann tube are also discussed.

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Dynamic characteristics of a resonant gas-dynamic system for ignition of a fuel mixture

Cited by 13 publications

References 2 publications

Experimental Study of Methane Combustion Efficiency in a High-Enthalpy Oxygen-Containing Flow

Experimental Study of Methane Combustion Efficiency in a High-Enthalpy Oxygen-Containing Flow

Hartmann–Sprenger Energy Separation Effect for the Quasi-Isothermal Pressure Reduction of Natural Gas: Feasibility Analysis and Numerical Simulation

Self-oscillatory flow in the Hartmann resonator – Numerical simulation

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