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 14 publications

(4 citation statements)

References 35 publications

(57 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

DESHMUKH,

WAGHMODE

2023

Journal of Thermal Engineering

View full text Add to dashboard Buy / Rent full text

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.

show abstract

Section: Introductionmentioning

confidence: 99%

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

DESHMUKH,

WAGHMODE

2023

Journal of Thermal Engineering

View full text Add to dashboard Buy / Rent full text

show abstract

“…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

Ansari¹,

Phalak²,

Mathew³

2022

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

View full text Add to dashboard Buy / Rent full text

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.

show abstract

“…The flame excites the fundamental mode or one of the harmonics of the tube or combustion chamber. This can create instabilities in the system and the phenomenon is called thermo-acoustic instability (Deshmukh and Sharma, 2017a; Moeck et al, 2013; Paschereit et al, 1998; Zhao and Li, 2015). These instabilities can cause significant structural damage, which can be commonly observed in jet engines, gas turbines, industrial burners, combustion engines, etc.…”

Section: Introductionmentioning

confidence: 99%

“…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

Deshmukh

Ansari

Kumar

et al. 2021

Journal of Vibration and Control

Self Cite

View full text Add to dashboard Buy / Rent full text

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.

show abstract

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

Cited by 14 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

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

Contact Info

Product

Resources

About