Effect of pointed and diffused air injection on premixed flame confined in a Rijke tube

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

doi:10.1080/23311916.2016.1156280

Cited by 6 publications

(3 citation statements)

References 24 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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“…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. Deshmukh et al [5] have studied the effect of volume and length of the neck of a Helmholtz resonator on the suppression of thermo-acoustic instabilities and have concluded that for a longer neck length the standing wave developed inside the Rijke tube has to travel a longer distance resulting in less reduction in sound pressure level, hence shorter neck length was found to be more effective than longer neck length.…”

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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“…It could be of two types, namely, open loop and closed loop. Different controllers in active control methods include external acoustic dampers (loudspeakers) (Heckl, 1988), fuel modulation to the combustor (phase-shifting controller) (Heckl, 1988), secondary fuel injection (Annaswamy and Ghoniem, 2002; Hathout et al, 2000; Neumeier, 1996), and releasing air radially inside the combustor (radial air injection system) (Barooah et al, 2003; Deshmukh and Sharma, 2016, 2017a, 2017b, 2020; Marosky et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Effect of position of radial air injection plane on control of thermo-acoustic instability using active closed-loop method

Deshmukh¹,

Ansari²,

Kumar³

et al. 2021

Journal of Vibration and Control

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Thermo-acoustic instability occurs when self-excited oscillations are generated due to the coupling between unsteady heat release and acoustics. This phenomenon can result in an increased rate of vibration, structural damage, and produces unwanted emissions. Thermo-acoustic instability occurs in rocket engines, gas turbines, combustors, and furnaces. When thermo-acoustic instability occurs, many modes are developed naturally at a specific point. Some waves are unstable and some are stable. So, to study this phenomenon the most unstable waves are considered and a technique is developed to suppress these unstable waves. A radial air injector as a closed-loop active control method is used for breaking the coupling between the heat waves and acoustics inside the 1D combustion chamber. The distance between the burner and the air injector is varied for the fixed position of the burner with respect to the Rijke tube, that is, x/L = 0.01125, 0.0075, and 0.00375. This closed-loop method works based on the feedback acquired from a microphone. The control method is built using DAQ and Arduino with the LabVIEW as interface for Arduino (LIFA). An air flow rate controller setup is developed to control and measure air required for suppressing the thermo-acoustic instability. Thermo-acoustic instability is effectively suppressed with the help of radial injection in the form of micro-jets at the downstream of the burner as the closed-loop controlling method. It is concluded that when the radial micro-jet air injection plane is closer to the burner head, the thermo-acoustic instability gets suppressed in a short time and with a lesser quantity of air.

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Effect of pointed and diffused air injection on premixed flame confined in a Rijke tube

Cited by 6 publications

References 24 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

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

Effect of position of radial air injection plane on control of thermo-acoustic instability using active closed-loop method

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