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Effect of Slanted Perforation in Tabs for Subsonic and Transonic Jets

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Fluid Mechanics and Fluid Power – Contemporary Research

Part of the book series: Lecture Notes in Mechanical Engineering ((LNME))

Abstract

Jet from convergent nozzle under correctly expanded condition was controlled by two tabs kept opposite to each other with straight perforation and slanted perforation at different angles of 10°, 20° and 30°. This jet was compared with uncontrolled jet and jet with solid tab. It was found that jet with tab of slanted perforation 30° was having a lesser potential core as compared to jet with solid Tab. Further it was found that the effectiveness of the tab with slanted perforation increased with increasing slanted perforation angle. The streamwise vortices introduced by the slanted perforation in tabs were inclined towards the centreline of the jet and thereby causing the disturbance in potential core region of the primary jet and resulting in faster decay of the jet.

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Abbreviations

D:

Nozzle exit diameter

L:

Length of the tab

M:

Mach number measured at the concerned point

Mj :

Mach number at the exit of nozzle

Po :

Total pressure in settling chamber

Pt :

Total pressure measured using Pitot tube

W:

Width of the tab

X/D:

Axial position taken along the centreline of the jet

Y/D:

Radial position taken along the tab

Z/D:

Radial position taken normal to the tab

αp :

Slanted Perforation angle in the Tab

Φp :

Perforation Diameter

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Authors and Affiliations

  1. KCG College of Technology, Anna University, Chennai, India

    R. Asad Ahmed

  2. Madras Institute of Technology, Anna University, Chennai, India

    S. Thanigaiarasu, D. L. V. Vasu Kannah & S. Elangovan

  3. Bharath University, Chennai, India

    E. Rathakrishnan

  4. Indian Institute of Technology, Kanpur, 208016, India

    R. Asad Ahmed, S. Thanigaiarasu, D. L. V. Vasu Kannah, S. Elangovan & E. Rathakrishnan

Authors
  1. R. Asad Ahmed
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  2. S. Thanigaiarasu
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  3. D. L. V. Vasu Kannah
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  4. S. Elangovan
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  5. E. Rathakrishnan
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Corresponding author

Correspondence to R. Asad Ahmed .

Editor information

Editors and Affiliations

  1. Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh, India

    Arun K. Saha

  2. Department of Aerospace Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh, India

    Debopam Das

  3. Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh, India

    Rajesh Srivastava

  4. Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh, India

    P. K. Panigrahi

  5. Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh, India

    K. Muralidhar

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Ahmed, R.A., Thanigaiarasu, S., Kannah, D.L.V.V., Elangovan, S., Rathakrishnan, E. (2017). Effect of Slanted Perforation in Tabs for Subsonic and Transonic Jets. In: Saha, A., Das, D., Srivastava, R., Panigrahi, P., Muralidhar, K. (eds) Fluid Mechanics and Fluid Power – Contemporary Research. Lecture Notes in Mechanical Engineering. Springer, New Delhi. https://doi.org/10.1007/978-81-322-2743-4_75

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  • DOI: https://doi.org/10.1007/978-81-322-2743-4_75

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  • Publisher Name: Springer, New Delhi

  • Print ISBN: 978-81-322-2741-0

  • Online ISBN: 978-81-322-2743-4

  • eBook Packages: EngineeringEngineering (R0)

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