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Technical Briefs

Effect of Co-Flow on Near Field Shock Structure

[+] Author and Article Information
T. Srinivasarao

Department of Mechanical Engineering,  Lakireddy Balireddy College of Engineering, Mylavaram, Indiatsr_1053@yahoo.co.in

P. Lovaraju

Department of Mechanical Engineering,  Lakireddy Balireddy College of Engineering, Mylavaram, Indialovaraju_p@lbrce.ac.in

E. Rathakrishnan

Department of Aerospace Engineering,  IIT Kanpur, Kanpur, Indiaerath@iitk.ac.in

J. Fluids Eng 134(7), 074501 (Jun 21, 2012) (5 pages) doi:10.1115/1.4006911 History: Received November 29, 2011; Revised May 18, 2012; Published June 21, 2012; Online June 21, 2012

This paper presents the experimental results of underexpanded jets delivered from a central nozzle surrounded by a co-flow. The co-flow is found to be effective in elongating the supersonic core length of the central jet, at all levels of underexpansion. However, the expansion level of the central jet dictates the elongation caused by the co-flow.

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Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic diagram of co-flow model

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Figure 2

Centerline pressure distribution without co-flow

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Figure 3

Centerline pressure distribution with co-flow

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Figure 4

(a) Shadowgraph picture at NPR 3 without co-flow (b) shadowgraph picture at NPR 3 with co-flow

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Figure 5

(a) Shadowgraph picture at NPR 4 without co-flow (b) shadowgraph picture at NPR 4 with co-flow

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Figure 6

(a) Shadowgraph picture at NPR 5 without co-flow (b) shadowgraph picture at NPR 5 with co-flow

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Figure 7

Axial extent of pixel intensity from the shadowgraph images

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Figure 8

(a) Pitot pressure profiles at NPR 5 without co-flow (b) Pitot pressure profiles at NPR 5 with co-flow

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Figure 9

Pitot pressure profiles at X/D = 2.0

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