Combustion Vibration Research Articles

Study of Operation of Power-Generating Devices of Gaseous Fuels Combustion

The paper identifies the relevance of research on the effectiveness of fire-technical processes in energy devices (boilers, furnaces and internal combustion engines, etc.) in order to optimize them and improve their reliability. The survey revealed the closeness of calculation methods for such devices. The development of engineering methodology of design and verification calculations is necessary for the further development of vibration combustion machines production industry. The author identifies the main problems of formation of calculating methodology for energy devices operating on the basis of vibration combustion. To determine the frequency of the impulse response of these devices the author proposes a mathematical model and the description of the process of the thermodynamic fluctuations in the combustion chamber, allowing to determine the reliability and efficiency of these devices for different purposes based on the principle of self-oscillating combustion of fuel at the design stage.

Vibration combustion as a prospect for utilizing firewood contaminated with radiocesium

We present results of experimental investigation relevant to vibration combustion of solid fuel specimens in a Rijke tube and the interpretation of the combustion mechanism on the basis of “energy” approach. The decrease in the flame temperature is noted, which can be used to reduce the yield of low-boiling mineral components of ash, e.g., radioactive 137Cs isotope, in the volatile phase. The distribution of 137Cs in thermal conversions of firewood has been studied with the aid of computational-experimental methods, and the use of vibration combustion for utilizing the firewood contaminated with radiocesium has been suggested to decrease the emission of 137Cs into the surrounding medium.

Concerning the problem of dynamic damping of the vibration combustion self-oscillations in a liquid-propellant rocket engine

The reason for the decrease in the amplitude of longitudinal vibration combustion self-oscillations in the combustion chamber of a liquid-propellant rocket engine by means of antipulse partitions has been justified. A mathematical model of the development of combustion instability in such a chamber on attachment of a Helmholtz resonator to it has been obtained. The character of the damping of vibration combustion self-oscillations excited by the action of the Crocco mechanisms and negative thermal resistance, when varying the acoustic parameters of the resonator and of the pressure head characteristics of combustion chamber is established.

Conditions for exciting the maximal gas vibration amplitude in a combustion chamber of the Helmholtz resonator type

In this paper, we present the results of calculating conditions for gas vibration excitement, sound pressure frequency and level as a function of mixture composition, geometric burner parameters and the resonator throat with constant capacity. We estimate in quantity the parameters influencing a vibration combustion process in the Helmholtz resonator with the inlet multichannel burner which result in the maximum possible gas vibration amplitude value.

Control of the self-oscillation of amplitude of vibration combustion in a liquid-propellant rocket engine by solving the system of equations that describe this regime of combustion

Periodic solutions of the degenerate system of equations of nonstationary motion of a medium in a liquid-propellant rocket engine were obtained, with the aid of which the possibility of lowering the amplitude of the longitudinal self-oscillations of vibration combustion or their complete removal has been substantiated.

Methods of combating the phenomenon of vibration combustion in low emission combustion chambers of gas turbine installations

The comparative analysis of domestic and foreign experience of vibration burning suppression in low emission combustion chambers of the gas-turbine units is executed, which enabled de bene esse to select two basic groups of methods of vibration burning suppression: passive and active. Basic advantages and failings are shown to each of the selected groups of methods, perspective and high efficiency of the active vibration burning suppression.

A mathematical model of vibration combustion in a tube with sudden cross-section change

The theoretical study of vibration combustion using a model of the pulsejet engine was carried out. The frequencies and amplitudes of gas vibrations that were calculated by the energy method are well agreed with experimental data.

Optical Study of Vibrational Combustion of Hydrogen in Tubes

Results of an experimental study of vibrational combustion of hydrogen in an ejected air flow in quartz tubes are described. The study is performed with the use of an optical system that allows registering intensity of luminescence of OH radicals in the hydrogen plume. Local heat-release zones are found on the basis of measurement results.

Control of thrust characteristics of a scramjet combustor with vibrational combustion using acoustic resonators

The effect of a resonator on the thrust characteristics of a scramjet combustor with vibrational combustion of hydrogen is studied experimentally. A cylindrical tube with a confuser entrance was used as a combustion chamber. The centerline of the resonator is perpendicular to the combustor axis. It is shown that the thrust characteristics of the combustor depend on the resonator position relative to the combustor and on the linear dimensions of the resonator.

Revision of the conceptual model of combustion mechanism in a liquid-propellant rocket on the basis of the results of highly informative experiments. I. A review of experimental studies

In seeking sources of irregular, stochastic excitation of vibrational combustion in liquid-propellant rocket of various types with the use of a number of independent highly informative experimental methods, a group of phenomena (called parametric instability) that are inconsistent with the traditional conceptual model of the combustion mechanism in given objects was found. Revision of this model is required.

Hydrodynamic sources of oscillations in combustion chambers

It is shown that low-frequency sources of oscillations in the combustion chambers of solid-propellant reaction engines are attributable to hydrodynamic instability of large-scale contact discontinuities in the main gas flow and are not associated with vibratory combustion. This conclusion is corroborated by experimental and numerical investigations.

Integral formulation of the theory of vibratory combustion

Integral formulation of the theory of vibratory combustion

Condition of the beginning of vibrational gas combustion in an unsealed vessel of rectangular shape

Condition of the beginning of vibrational gas combustion in an unsealed vessel of rectangular shape

Experimental investigation of the excitation of the vibrational combustion of a homogeneous mixture in a model chamber

Experimental investigation of the excitation of the vibrational combustion of a homogeneous mixture in a model chamber

Investigation of relaxation vibration combustion in exhaust and injection pipes

Investigation of relaxation vibration combustion in exhaust and injection pipes

Effect of the input impedance of a resonator, installed in the end of a tube, on the parameters of vibrational combustion

Effect of the input impedance of a resonator, installed in the end of a tube, on the parameters of vibrational combustion

Effect of an electric field on the vibratory combustion of propane

Effect of an electric field on the vibratory combustion of propane

Note on the appearance of vortices in vibratory combustion

Note on the appearance of vortices in vibratory combustion

Vibrational combustion in furnaces with panel burners

Vibrational combustion in furnaces with panel burners

Calculation of flame wavelength in vibratory combustion in tubes

A calculation is made of the wavelength at the surface of a flame in vibratory combustion in a tube, allowing for preheating of the fuel mixture through heat conduction ahead of the ignition front.