Experiments on heat content inside a Rijke tube with suppression of thermo-acoustics instability

Deshmukh, Nilaj N.; Sharma, S. D.

doi:10.1177/1756827716655007

Cited by 18 publications

(7 citation statements)

References 35 publications

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“…Ying-li Shao et al (4) proposed a new concept of exhaust silencer using active cancellation phenomena. Deshmukh and Sharma studied the effect of radial air injection inside the combustor for suppression of thermo-acoustic instabilities (5)(6)(7). Brenda and Mark (8) used fluidic injection nozzles to inject air at the nozzle trailing edge in jets to reducing broadband shock noise.…”

Section: Introductionmentioning

confidence: 99%

Control of noise and temperature using radial air injection inside engine silencer

DESHMUKH¹,

WAGHMODE²

2023

Journal of Thermal Engineering

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Silencer is a device mainly used for attenuation of the engine exhaust noise. Several modifications were attempted to improve the performance of a silencer. In this paper experimental and simulation study was carried out to determine the effect of radial air injection on the temperature and sound pressure level. The radial air injection is introduced in the form of jets inside the silencer. The design of available silencer was studied, and the 3D model was prepared using CATIA software. Simulation study was carried out using ANSYS Fluent, to determine the temperature distribution inside the silencer with and without modification. The radial jets at different pressure were introduced inside the silencer at three different locations. To acquire sound pressure level and temperatures at different locations, Lab View software and FFT analyser were used. The performance of silencer is analysed by comparing temperature of exhaust gases and sound pressure level at constant speed of 3000 rpm. With radial air jets of 2 bar reservoir pressure at three different location Overall Sound Pressure Level reduces by 6 dB and 42 K reduction in temperature of exhaust gases.

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Section: Introductionmentioning

confidence: 99%

Control of noise and temperature using radial air injection inside engine silencer

DESHMUKH¹,

WAGHMODE²

2023

Journal of Thermal Engineering

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“…Thermoacoustic instability is a phenomenon involving the combined effect of acoustic-pressure and heat-release rate fluctuations [1] , [2] , [3] which further results in unsteady heat release [4] , [5] , [6] , [7] . This unsteadiness again creates sound and this cycle keeps on repeating, which can lead to catastrophic structural failure [6] .…”

Section: Introductionmentioning

confidence: 99%

Development of closed-loop active control method for suppression of thermoacoustic instability using radial air micro-jets

Deshmukh¹,

Ansari²,

Kumar³

et al. 2023

MethodsX

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“…Extensive use of sensors and actuators is involved in active methods. Experiments have been carried out by Deshmukh and Sharma [3] using active methods in which micro-jets of air at different positions along the Rijke tube have been used to suppress the instability. Further, investigations have been carried out by Deshmukh and Sharma [4] to study the effects of pointed injection and diffused injection over a premixed flame on the sound pressure level.…”

Section: Introductionmentioning

confidence: 99%

Effect of helmholtz resonator shape on suppression of thermo-acoustic instability

Deshmukh¹,

Ansari²,

Phalak³

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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In combustion chambers thermo-acoustic instabilities arise due to the coupling between the unsteady heat release and pressure fluctuations. The instabilities created cause serious structural vibration, flame blow out, increase in heat transfer and damage, thereby reducing the life span and performance of jet engines, gas turbines and industrial burners. Therefore, there is need to develop a simple technique for effective control of these instabilities. The present work involves experimental study of thermo-acoustic instabilities occurring in a Rijke tube and their suppression by using Helmholtz resonators of different shape (a passive method of suppression). The combustor model is replaced by Rijke tube which is an experimental setup extensively employed for research purpose. Rijke tube is provided with a co-axial pre-mixed gas burner as the source of heat which could be placed at any desired position. When a heat source with proper air to fuel ratio is placed at about one fourth of the tube length, 3rd mode of instability is obtained and a loud noise of frequency 681 Hz is produced. A comparative study of thermo-acoustic instability suppression using cylindrical, spherical and conical Helmholtz resonators has been performed. Spherical resonator has been found to be the most effective one imparting a maximum damping effect of 20 dB and an average damping effect of 10.5 dB.

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Experiments on heat content inside a Rijke tube with suppression of thermo-acoustics instability

Cited by 18 publications

References 35 publications

Control of noise and temperature using radial air injection inside engine silencer

Control of noise and temperature using radial air injection inside engine silencer

Development of closed-loop active control method for suppression of thermoacoustic instability using radial air micro-jets

Effect of helmholtz resonator shape on suppression of thermo-acoustic instability

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