Technical Briefs

Identification of the Cold Flow Perturbation Sources in a Dump Combustor With a Tapered Exit

[+] Author and Article Information
N. P. Yadav

Department of Mechanical Engineering,
Bundelkhand Institute of Engineering and Technology,
Jhansi, Utter Pradesh, 284128, India
e-mail: npy_biet@rediffmail.com

Abhijit Kushari

Department of Aerospace Engineering,
Indian Institute of Technology, Kanpur,
Utter Pradesh, 208016, India
e-mail: akushari@iitk.ac.in

Manuscript received April 27, 2012; final manuscript received December 18, 2012; published online January 18, 2013. Assoc. Editor: John Abraham.

J. Fluids Eng 135(1), 014502 (Jan 18, 2013) (5 pages) Paper No: FE-12-1218; doi: 10.1115/1.4023199 History: Received April 27, 2012; Revised December 18, 2012

This paper reports on the experimental investigation of the flow inside a low aspect ratio (length less than the reattachment length of separated flow) dump combustor with a tapered exit. The flow field in the combustor is evaluated using wall pressure and velocity measurements at varying flow Reynolds numbers. The mean velocity and turbulence variation closer to the wall of the combustor was found to be different from that at other radial locations due to the presence of recirculation and possible thickening of the shear layer caused by a decrease in the strength of the potential core. The power spectral study of the wall pressure and velocity fluctuations suggested the dominant presence of acoustic perturbations with amplitude modulation of such perturbations due to viscous dissipation in the shear layer.

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Grahic Jump Location
Fig. 1

Schematic of experimental setup

Grahic Jump Location
Fig. 2

Velocity and turbulence variations inside the combustor: (a) mean velocity with x/h for different r/R for Re = 5733, (b) rms velocity with x/h at different r/R for Re = 5733, and (c) radial variation of turbulence intensity at x/h = 3.75 for different Re

Grahic Jump Location
Fig. 3

Power spectra of wall pressure fluctuations: (a) at different measurement locations for Re = 5733 and (b) at x/h = 3.75 for different Re

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Fig. 4

Power spectrum of velocity fluctuations at different measurement locations for Re = 5733: (a) r/R = 0.0, (b) r/R = 0.33, and (c) r/R = 0.66

Grahic Jump Location
Fig. 5

Power spectrum of velocity fluctuation at x/h = 3.75 and r/R = 0.33 for different Re

Grahic Jump Location
Fig. 6

Schematic diagram of a combustor for theoretical calculation of acoustic frequencies (dimensions are in mm)



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