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Research Papers: Flows in Complex Systems

Nozzle Aspect Ratio Effect on Supersonic Elliptic Jet Mixing

[+] Author and Article Information
S. M. Aravindh Kumar

Indian Institute of Technology Kanpur,
Kanpur 208016, India
e-mail: aravinds@iitk.ac.in

E. Rathakrishnan

Professor
Indian Institute of Technology Kanpur,
Kanpur 208016, India
e-mail: erath@iitk.ac.in

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received February 22, 2016; final manuscript received May 9, 2017; published online July 21, 2017. Assoc. Editor: Feng Liu.

J. Fluids Eng 139(10), 101103 (Jul 21, 2017) (17 pages) Paper No: FE-16-1115; doi: 10.1115/1.4036823 History: Received February 22, 2016; Revised May 09, 2017

Nozzle aspect ratio effect on the mixing of Mach 2 elliptic free jet, issuing from convergent–divergent elliptic nozzles of aspect ratios 2, 3, and 4, in the presence of adverse and marginally favorable pressure gradients at the nozzle exit has been studied experimentally. The results show that AR4 jet enjoys better mixing than AR2 and AR3 jets at all nozzle pressure ratios. The AR2 and AR3 jets displayed axis switching, whereas there is no axis switching for AR4 jet. The shadowgraph shows that the waves in AR4 jet are weaker than those in AR2 and AR3 jets.

Copyright © 2017 by ASME
Topics: Pressure , Jets , Nozzles
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References

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Figures

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Fig. 1

Schematic sketch of open jet facility

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Fig. 2

Nozzle details: (a) computer-aided design (CAD) drawing, (b) AR3 and AR4 nozzle models, (c) and (d) AR3 and AR4 nozzle dimensions

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Fig. 3

Schematic diagram of the nozzle exit and the coordinates followed

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Fig. 4

Centerline pressure decay of Mach 2 jets at NPR 4 (overexpanded)

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Fig. 5

Centerline pressure decay of Mach 2 jets at NPR 5 (overexpanded)

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Fig. 6

Centerline pressure decay of Mach 2 jets at NPR 6 (overexpanded)

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Fig. 7

Centerline pressure decay of Mach 2 jets at NPR 7 (overexpanded)

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Fig. 8

Centerline pressure decay of Mach 2 jets at NPR 8 (marginallyunderexpanded)

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Fig. 9

Isopitot pressure contours of AR3 elliptic jet at NPR 6 (overexpanded)

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Fig. 10

Isopitot pressure contours of AR3 elliptic jet at NPR 7 (overexpanded)

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Fig. 11

Isopitot pressure contours of AR3 elliptic jet at NPR 8 (marginally underexpanded)

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Fig. 12

Isopitot pressure contours of AR2 elliptic jet at NPR 6 (overexpanded)

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Fig. 13

Isopitot pressure contours of AR2 elliptic jet at NPR 7 (overexpanded)

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Fig. 14

Isopitot pressure contours of AR2 elliptic jet at NPR 8 (marginally underexpanded)

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Fig. 15

Isopitot pressure contours of AR4 elliptic jet at NPR 6 (overexpanded)

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Fig. 16

Isopitot pressure contours of AR4 elliptic jet at NPR 7 (overexpanded)

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Fig. 17

Isopitot pressure contours of AR4 elliptic jet at NPR 8 (marginally underexpanded)

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Fig. 18

Variation of axis switching location with NPR: Δ, AR3 jet [4]; ◻, AR2 jet

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Fig. 19

Shadowgraph pictures of AR2 elliptic jet at NPRs 4, 6, and 8 [4]

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Fig. 20

Shadowgraph pictures of AR3 elliptic jet at NPRs 4, 6, and 8

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Fig. 21

Shadowgraph pictures of AR4 elliptic jet at NPRs 4, 6, and 8

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