Damping Decrements in the Combustion Chambers of Liquid-Propellant Rocket Engines

Biryukov, V. I.; Tsarapkin, R. A.

doi:10.3103/s1068798x19010155

Cited by 2 publications

(6 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Modern experimental methods for assessing stability in engines are based on the creation of artificial disturbances in the combustion chambers (using an explosive sample inside the chamber or an explosion product stream outside the combustion chamber, etc.) with subsequent registration and analysis of the resulting oscillatory processes [2][3]13]. The creation of artificial perturbations of pressure or flow (equal to speed) in the combustion chambers, and the subsequent response of the combustion processes recorded during the experiment, as well as the registration of natural "noise" and the subsequent analysis of the results of the statistical processing of the measured signals allow us to obtain quantitative estimates of the stability margins of the working process compared with other known approaches [3,13].…”

Section: Acoustic Combustion Instabilitymentioning

confidence: 99%

“…with subsequent registration and analysis of the resulting oscillatory processes [2][3]13]. The creation of artificial perturbations of pressure or flow (equal to speed) in the combustion chambers, and the subsequent response of the combustion processes recorded during the experiment, as well as the registration of natural "noise" and the subsequent analysis of the results of the statistical processing of the measured signals allow us to obtain quantitative estimates of the stability margins of the working process compared with other known approaches [3,13]. The first method is similar to that used in mathematics to study the stability of systems of equations: an artificial perturbation is introduced into a working combustion chamber, in the other case, natural perturbations of the working process-"noise during combustion"-are used.…”

Section: Acoustic Combustion Instabilitymentioning

confidence: 99%

“…To determine the experimental values of the decrement of pressure fluctuations, including noise, the following methods can be applied: spectral, correlation, amplitude, and the instantaneous method [13].…”

Section: Acoustic Combustion Instabilitymentioning

confidence: 99%

“…Eqs. (12) and (13) imply the equality for the real and imaginary parts of the conductivity of the system links…”

Section: An Introduction To Direct Numerical Simulations Of Turbulentmentioning

confidence: 99%

See 3 more Smart Citations

Bases of Combustion Instability

Biryukov¹

2021

Direct Numerical Simulations - An Introduction and Applications

View full text Add to dashboard Cite

Combustible systems generally consist of two types of chemically interacting components during combustion: an oxidizing agent (oxygen, fluorine, chlorine, their compounds) and fuel (hydrogen, hydrocarbons, nitrogen and hydrogen compounds, aluminum, etc.). The chemical properties of the components, their phase state, and their physical structure are essential when choosing the methods for supplying the components and organizing the processes in the combustion chambers, but they relatively weakly affect the basic laws of combustion processes. In the theory of combustion, the problems of burning homogeneous, premixed, gaseous components are studied in most detail. The concepts and methods of the theory of combustion are used in other areas of science and technology when considering exothermic processes with high heat generation. The separation of the issues of flame stability into diffusion-thermal and hydrodynamic problems, which is often encountered in theoretical works, is conditional and is caused by the desire to reduce the mathematical difficulties that arise when solving the problem in the general formulation. In fact, flame instability is determined by the influence of both transport processes in the flame (diffusion-thermal processes), depending on its structure, and hydrodynamic processes, i.e., the effects of gas flow. The determination of the concentration limits of flame propagation, ignition, and extinction, spontaneous instability of the flame front, the transition of combustion to detonation, and the excitation of oscillations during combustion are practical problems of the theory of combustion. Acoustic combustion instability can be considered as a self-oscillating process in which the feedback providing the energy necessary for maintaining undamped wave motions from a nonperiodic heat source (combustion process) is realized through the action of sound (acoustic) waves on combustion; in this case, the parameters of the wave motions, amplitude, waveform, and frequency, are determined by the internal properties of the system itself. This chapter provides a sequence of parametric estimates of acoustic instability during combustion in cylindrical chambers.

show abstract

Section: Acoustic Combustion Instabilitymentioning

confidence: 99%

Section: Acoustic Combustion Instabilitymentioning

confidence: 99%

Section: Acoustic Combustion Instabilitymentioning

confidence: 99%

“…Eqs. (12) and (13) imply the equality for the real and imaginary parts of the conductivity of the system links…”

Section: An Introduction To Direct Numerical Simulations Of Turbulentmentioning

confidence: 99%

See 2 more Smart Citations

Bases of Combustion Instability

Biryukov¹

2021

Direct Numerical Simulations - An Introduction and Applications

View full text Add to dashboard Cite

show abstract

“…Such shock disturbances on sliding supports lead to dynamic instability of the rocket sleigh and to bending vibrations of the protruding cantilever part of the test object, to limit vibration loading of the electronic equipment of the test object. In order to ensure the directional stability of the movement, the problem of the stochastic transition of the vibroacoustic mode of a potentially nonlinear system into a self-oscillating one is considered [1][2].…”

Section: Introductionmentioning

confidence: 99%

Stochastic Mechanism of Shock Disturbances of Rocket Sleigh Supports during High-Speed Track Testing of Aviation Equipment

Astakhov,

Biryukov

2023

E3S Web Conf.

View full text Add to dashboard Cite

Tests of ballistic aircraft on rail tracks in conditions close to real ones are an economically viable alternative to flight tests. Rocket rail tracks exist in the USA, Canada, France, China and a number of other countries. The article con-siders potentially self-oscillating mechanical systems that have a threshold mechanism for the transition from a noise vibrational stable state to a self-oscillatory one, depending on the mode parameters. An algorithm for estimating the damping coefficient of the harmonic components of a particular mode of a complex process is proposed. As an indicator of energy loss of the oscillatory component during resonant interaction, the value of the density of the power spectrum related to the width of the frequency range is taken. Based on the solution of the Fokker-Planck equation for a stochastic process, estimates of the “drift” and “diffusion” coefficients are obtained. A technique for estimating the state of potentially self-oscillatory systems in the form of a set of probabilistic stochastic characteristics is proposed. According to the experimental data of vibration accelerations for the structural elements of the rocket sled with the test object, according to the proposed method, it is possible to make the contribution of the self-oscillations of the elements, if they are pre-sent in a complex vibration process, and also to make estimates of their vibration strength at resonances.

show abstract

Damping Decrements in the Combustion Chambers of Liquid-Propellant Rocket Engines

Cited by 2 publications

References 4 publications

Bases of Combustion Instability

Bases of Combustion Instability

Stochastic Mechanism of Shock Disturbances of Rocket Sleigh Supports during High-Speed Track Testing of Aviation Equipment

Contact Info

Product

Resources

About