TY - JOUR
T1 - Focused Laser Differential Interferometric Investigation of Turbulent Jet Spectra
AU - Hameed, Ahsan
AU - Parziale, Nick J.
N1 - Publisher Copyright:
© 2022 by Nick Parziale.
PY - 2022/9/1
Y1 - 2022/9/1
N2 - In this work, a model of focused laser differential interferometry (FLDI) is derived by incorporating the local intensity of each beam in an FLDI beam pair. We rederive some known transfer functions to reduce FLDI data. Additional transfer functions are also derived, intended to model increasingly complex disturbance fields, namely, isotropic turbulence. The new transfer functions account for disturbances not only in the streamwise direction but also in the two spanwise directions. Additionally, it is shown that strategically selecting the integration limits for the idealized FLDI in the denominator of the transfer functions (dϕ∕dx) can simplify the FLDI data-reduction procedure. This is done for disturbance fields in a finite boundary (e.g., a wind tunnel of scale L), by removing the need to characterize the FLDI probe-volume length scale. Finally, results are presented from experiments performed with a turbulent jet probed by an FLDI that indicate that increasing the complexity of the transfer function has merit with some qualifications.
AB - In this work, a model of focused laser differential interferometry (FLDI) is derived by incorporating the local intensity of each beam in an FLDI beam pair. We rederive some known transfer functions to reduce FLDI data. Additional transfer functions are also derived, intended to model increasingly complex disturbance fields, namely, isotropic turbulence. The new transfer functions account for disturbances not only in the streamwise direction but also in the two spanwise directions. Additionally, it is shown that strategically selecting the integration limits for the idealized FLDI in the denominator of the transfer functions (dϕ∕dx) can simplify the FLDI data-reduction procedure. This is done for disturbance fields in a finite boundary (e.g., a wind tunnel of scale L), by removing the need to characterize the FLDI probe-volume length scale. Finally, results are presented from experiments performed with a turbulent jet probed by an FLDI that indicate that increasing the complexity of the transfer function has merit with some qualifications.
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U2 - 10.2514/1.A35292
DO - 10.2514/1.A35292
M3 - Article
AN - SCOPUS:85139478358
SN - 0022-4650
VL - 59
SP - 1565
EP - 1573
JO - Journal of Spacecraft and Rockets
JF - Journal of Spacecraft and Rockets
IS - 5
ER -