Three-component flow velocity measurements with stereoscopic picosecond laser electronic excitation tagging

Colter Russell; Naibo Jiang; Paul Danehy; Zhili Zhang; Sukesh Roy

doi:10.1364/AO.420067

Applied Optics
Vol. 60,
Issue 15,
pp. C121-C130
(2021)
•https://doi.org/10.1364/AO.420067

Three-component flow velocity measurements with stereoscopic picosecond laser electronic excitation tagging

Colter Russell, Naibo Jiang, Paul Danehy, Zhili Zhang, and Sukesh Roy

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Colter Russell, Naibo Jiang, Paul Danehy, Zhili Zhang, and Sukesh Roy, "Three-component flow velocity measurements with stereoscopic picosecond laser electronic excitation tagging," Appl. Opt. 60, C121-C130 (2021)

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Abstract

Nonintrusive three-component (3C) velocity measurements of free jet flows were conducted by stereoscopic picosecond laser electronic excitation tagging (S-PLEET) at 100 kHz. The fundamental frequency of the burst-mode laser at 1064 nm was focused to generate the PLEET signal in a free jet flow. A stereoscopic imaging system was used to capture the PLEET signals. The 3C centroids of the PLEET signal were determined by utilizing simultaneous images from two cameras placed at an angle. The temporal evolutions of the centroids were obtained and used to determine the instantaneous, time-resolved 3C velocities of the flows. The free jets with various inlet pressures of 10–40 bars exhausting into atmospheric pressure air (i.e., underexpanded free jet with large pressure ratios; Reynolds numbers from the jet ranged from 39,000 to 145,000) were measured by S-PLEET. Key 3C turbulent properties of the free jets, including instantaneous and mean velocities, were obtained with an instantaneous measurement uncertainty of about ${\rm{\pm 10}}\;{\rm{m/s}}$, which is about 2% of the highest velocities measured. Computation of higher-order statistics including covariances related to turbulent kinetic energy and the Reynolds stress component was demonstrated. The 3C nonintrusive and unseeded velocimetry technique could provide a new tool for flow property measurements in ground test facilities; the measured high-frequency turbulence properties of free jet flows could be useful for turbulence modeling and validations.

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Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Inlet Pressures	Laser Energies	Y/D	$\bar{V_{x}}$	$\bar{V_{y}}$	$\bar{V_{z}}$	$σ_{vx}$	$σ_{vy}$	$σ_{vz}$	Re
(bar)	(mJ)	Y/D	(m/s)	(m/s)	(m/s)	(m/s)	(m/s)	(m/s)	Re
10	6	0.72	1.08	118	−2.28	5.2	7.8	14.8	39200
20	6	0.82	3.21	228	4.60	7.6	14.6	30.1	76000
20	20	0.82	3.12	217	17.0	6.3	8.9	25.7	72100
30	6	0.92	4.12	318	8.00	10.3	18.2	34.8	105000
40	6	1.01	6.31	436	−7.49	14.0	26.5	51.4	144000

Inlet Pressures	Laser Energies	$\bar{V_{x}^{'} \cdot V_{x}^{'}}$	$\bar{V_{y}^{'} \cdot V_{y}^{'}}$	$\bar{V_{x}^{'} \cdot V_{y}^{'}}$
(bar)	(mJ)	( $m^{2} / s^{2}$ )	( $m^{2} / s^{2}$ )	( $m^{2} / s^{2}$ )
10	6	27.4	56.8	3.92
20	6	59.6	209	18.9
20	20	39.6	93.7	11.0
30	6	104	332	24.5
40	6	198	698	32.5

Inlet Pressures	Laser Energies	Y/D	$\bar{V_{x}}$	$\bar{V_{y}}$	$\bar{V_{z}}$	$σ_{vx}$	$σ_{vy}$	$σ_{vz}$	Re
(bar)	(mJ)	Y/D	(m/s)	(m/s)	(m/s)	(m/s)	(m/s)	(m/s)	Re
10	6	0.72	1.08	118	−2.28	5.2	7.8	14.8	39200
20	6	0.82	3.21	228	4.60	7.6	14.6	30.1	76000
20	20	0.82	3.12	217	17.0	6.3	8.9	25.7	72100
30	6	0.92	4.12	318	8.00	10.3	18.2	34.8	105000
40	6	1.01	6.31	436	−7.49	14.0	26.5	51.4	144000

Inlet Pressures	Laser Energies	$\bar{V_{x}^{'} \cdot V_{x}^{'}}$	$\bar{V_{y}^{'} \cdot V_{y}^{'}}$	$\bar{V_{x}^{'} \cdot V_{y}^{'}}$
(bar)	(mJ)	( $m^{2} / s^{2}$ )	( $m^{2} / s^{2}$ )	( $m^{2} / s^{2}$ )
10	6	27.4	56.8	3.92
20	6	59.6	209	18.9
20	20	39.6	93.7	11.0
30	6	104	332	24.5
40	6	198	698	32.5

Abstract

Data Availability

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Tables (2)

Equations (4)

Applied Optics