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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Parametric Effects on Internal Aerodynamics of Lobed Mixer-Ejector With Curved Mixing Duct

[+] Author and Article Information
Pan Cheng-xiong

Jiangsu Province Key
Laboratory of Aerospace Power System,
College of Energy
and Power Engineering,
Nanjing University of Aeronautics and Astronautics,
Nanjing 210016, China
e-mail: chengxiong_pan@yahoo.com.cn

Shan Yong

Jiangsu Province Key
Laboratory of Aerospace Power System,
College of Energy and Power Engineering,
Nanjing University of Aeronautics and Astronautics,
Nanjing 210016, China
e-mail: nuaasy@nuaa.edu.cn

Zhang Jing-zhou

Jiangsu Province Key
Laboratory of Aerospace Power System,
College of Energy and Power Engineering,
Nanjing University of Aeronautics and Astronautics,
Nanjing 210016, China
e-mail: zhangjz@nuaa.edu.cn

1Corresponding author.

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received November 15, 2013; final manuscript received December 10, 2013; published online February 4, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(6), 061504 (Feb 04, 2014) (9 pages) Paper No: GTP-13-1413; doi: 10.1115/1.4026426 History: Received November 15, 2013; Revised December 10, 2013

The internal flow characteristics inside lobed mixer-ejector with curved mixing duct and the parametric effects on the lobed mixer-ejector performance are investigated numerically and validated by experimental test. The curved mixing duct affects the development of the streamwise vortices induced by the lobed mixer. When the mixing process undergoes the transition from the straight section to the bent section, the flow inside the curved mixing duct is dominated by the impinging and centrifugal effects. In general, the pumping ratio is decreased approximately 20%–30% once the bent section is mounted on the straight duct. The mixer-ejector performance could by improved by increasing the straight section length, due to more fully momentum utilization of primary jet and weaker influence of bent section on the back pressure near nozzle exit. The mixer-ejector pumping capacity is also augmented with the increase of mixing duct area ratio until the area ratio is reached to 3.5. And the fully-utilization of primary jet momentum inside mixing duct with big area ratio needs long mixing distance. The pumping ratio is decreased as the increase of bent angle of curved mixing duct in approximately linear relationship. When the bent angle exceeds 45 deg, the thermal mixing efficiency is decreased rapidly as the increase of bent angle.

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Figures

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Fig. 1

Schematic of lobed mixer-ejector IRS [3]

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Fig. 2

Schematic of primary jet spread [29]. (a) Under-utilized; (b) fully-utilized; and (c) over-utilized.

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Fig. 3

Schematic diagram of lobed mixer-ejector with curved mixing duct. (a) Lobed mixer-ejector; (b) curved mixing duct; and (c) lobed nozzle.

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Fig. 4

Schematic of test facility

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Fig. 5

Calculated internal flow fields inside curved mixing duct. (a) Static pressure (Pa) and (b) velocity vector.

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Fig. 6

Total pressure distributions at symmetric plane (x/lm = 0.5)

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Fig. 7

Calculated velocity vectors inside curved mixing duct. (a) Location of defined sections; (b) S1; (c) S2; (d) S3; and (e) W1.

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Fig. 8

Calculated normalized streamwise vorticity contours. (a) S1; (b) S2; and (c) S3.

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Fig. 9

Calculated temperature contours (a) W1, (b) W2, and (c) W3

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Fig. 10

Calculated streamline contours (a) W1, (b) W2, and (c) W3

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Fig. 11

Temperature distributions at curved mixing duct exit. (a) Major axis and (b) minor axis.

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Fig. 12

Effects of mixing duct straight section length and area ratio on mixer-ejector. (a) Pumping ratio and (b) thermal mixing efficiency.

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Fig. 13

Parametric effects on mixer-ejector with straight mixing duct. (a) Pumping ratio and (b) thermal mixing efficiency.

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Fig. 14

Effects of mixing duct bent angle on mixer-ejector. (a) Pumping ratio and (b) thermal mixing efficiency.

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