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Research Papers: Flows in Complex Systems

Influence of Impinging Wall Ramping Modification on the Flow Field of Open Cavity at M = 2.0

[+] Author and Article Information
V. S. Saranyamol

B. I. T. Mesra,
Ranchi 835215, India
e-mail: saranyavs993@gmail.com

P. Kumar

Assistant Professor
Department of Space Engineering and Rocketry,
B. I. T. Mesra,
Ranchi 835215, India
e-mail: priyankkumar@bitmesra.ac.in

S. Das

Professor
Department of Space Engineering and Rocketry,
B. I. T. Mesra,
Ranchi 835215, India
e-mail: sudipdas2410@gmail.com

1Present address: Department of Aerospace Engineering, IIT Kanpur.

2Present address: Department of Space Engineering and Rocketry, Birla Institute of Technology Mesra, Ranchi 835215, India

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received July 29, 2017; final manuscript received November 22, 2017; published online March 16, 2018. Assoc. Editor: Devesh Ranjan.

J. Fluids Eng 140(7), 071103 (Mar 16, 2018) (11 pages) Paper No: FE-17-1465; doi: 10.1115/1.4039247 History: Received July 29, 2017; Revised November 22, 2017

Studies were made to understand the flow features around an open cavity at Mach 2.0 corresponding to Re = 0.55 × 106 based on the cavity depth. Experiments were carried out using a blowdown type supersonic wind tunnel having a test section size of 50 mm × 100 mm. Oil flow and schlieren flow visualization were made to understand the steady flow features inside the cavity. Unsteady pressures were measured at several locations to obtain the fluctuating flow field details and the pressure spectrum. Impinging wall modifications of the cavity were made with an objective to reduce the Rossiter's mode frequencies and its amplitude. Partial ramping of the impinging wall with variations in height and angles were made. With adoption of a specific combination of the impinging wall height and angle, the first two modes of the multiple tonal characteristics could be reduced significantly. The present adopted method could result in 74% reduction of root-mean-square (RMS) pressure and a noise reduction of 11 dB.

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Figures

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Fig. 1

Schematic of open cavity flow at supersonic speed

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Fig. 2

Cavity geometry nomenclature

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Fig. 3

Supersonic wind tunnel facility

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Fig. 5

Fabricated cavity blocks

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Fig. 6

Different cavity configuration which are presently tested: (a) variation in impinging wall ramp height with constant angle, (b) variation in impinging wall ramp height with varying angle, and (c) variation in impinging wall ramp angle at constant height

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Fig. 7

Oil flow pattern over base model

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Fig. 8

Schlieren flow visualization around base model

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Fig. 9

Pressure time history for a typical time window measured at various locations on the base model

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Fig. 10

Pressure spectra obtained from unsteady pressure measurement at various locations on base model

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Fig. 11

(a) Comparison of tonal peaks of present experiments with literature at various Mach numbers and (b) comparison of reduction in RMS pressure for cavity having ramped impinging wall at various Mach numbers

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Fig. 12

Oil flow visualization showing the effect of impinging wall ramp height with constant angle

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Fig. 13

Pressure time history showing effect of ramp height with constant angle on impinging and front wall of cavity

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Fig. 14

Pressure spectra showing the comparison of various ramp heights with constant angle on impinging and front wall of cavity

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Fig. 15

RMS pressure distribution along the cavity center line showing the effect of impinging wall ramp height with constant angle

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Fig. 16

Overall sound pressure level along cavity length showing the effect of impinging wall ramp height with constant angle

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Fig. 17

Pressure time history showing the effect of ramp height with varying angle on impinging and front wall of cavity

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Fig. 18

Pressure spectra showing the effect of ramp height with varying angle on impinging and front wall of cavity

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Fig. 19

RMS pressure distribution showing the effect of ramp height with varying angle

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Fig. 20

Overall sound pressure level showing the effect of ramp height with varying angle

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Fig. 21

Oil flow visualization showing the effect of impinging wall ramp angle with constant height: (a) base model, (b) CIW0.5-71, (c) CIW0.5-56, and (d) CIW0.5-45

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Fig. 22

Pressure time history showing the effect of impinging wall ramp angle with constant height on impinging and front wall of cavity: (a) impinging wall and (b) front wall

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Fig. 23

Pressure spectra showing the effect of impinging wall ramp angle with constant height on impinging and front wall of cavity: (a) impinging wall and (b) front wall

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Fig. 24

RMS pressure distribution showing the effect of ramp angle with constant height

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Fig. 25

Overall sound pressure level showing the effect of ramp angle with constant height

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Fig. 26

Percentage reduction in nondimensional RMS pressure obtained with all the geometric variations adopted in the cavity

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Fig. 27

Reduction in OASPL obtained with all the geometric variations adopted in the cavity

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