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Effect of opposing jet on aerodynamic and flight stability characteristics of a generic supersonic slender forebody

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Abstract

Active flow control techniques, such as opposing jets, hold a high potential to mitigate wave drag effects in supersonic and hypersonic regimes. In literature, most of the work is related to blunt shape bodies and their aerodynamic analysis. This article focuses on using an opposing jet in a drag reduction of a slender forebody and associated changes in flight stability characteristics. Unsteady Reynolds averaged Navier-Stokes (URANS) based solver is used for flow-field modeling. The free-stream flows at a Mach of 1.6 with the jet ejection Mach of 1 is considered. Analysis of the 3D shockwave and its displacement from the surface of the body is discussed. This analysis includes the parametric study of pressure ratios (PR = 3 to 15) with increasing angles of attack (α∞ = 0° to 4°). The ejection of the jet displaces the shockwave from the leading edge of the slender forebody, which ultimately affects the body’s stability. The longitudinal flight stability characteristic of the body is studied in detail, with and without the jet’s ejection. This study indicates an improvement in the static stability coefficients (\({C_{{m_{{\alpha _o}}}}}\)) at low angles of attack. The dynamic stability coefficients (\({C_{{m_{\dot \alpha o}}}} + {C_{{m_q}}}\)) are also analyzed. It is concluded that the opposing jet improves the stability characteristics of the slender forebody.

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Abbreviations

PR :

Pressure ratio

M ∞ :

Free Mach number

α ∞ :

Free stream angle of attack

α :

Amplitude of perturbed body

α o :

Mean angle of attack of body

\({P_{{o_\infty }}}\) :

Free stream total pressure

\({T_{{o_\infty }}}\) :

Free stream total temperature

T ∞ :

Free stream temperature

P∞:

Free stream pressure

P j :

Jet static pressure

T j :

Jet static temperature

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Acknowledgments

This work is supported by the Computational Aeronautics Lab, Research Centre for Modeling and Simulation. The authors would like to thank Prof. Laurent Dala for guidance and discussions.

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Authors and Affiliations

  1. National University of Sciences and Technology, H-12 Campus, Islamabad, Pakistan

    Shagufta Rashid, Fahad Nawaz, Adnan Maqsood, Shuaib Salamat & Rizwan Riaz

Authors
  1. Shagufta Rashid
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  2. Fahad Nawaz
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  3. Adnan Maqsood
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  4. Shuaib Salamat
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  5. Rizwan Riaz
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Corresponding author

Correspondence to Adnan Maqsood.

Additional information

Adnan Maqsood is an Associate Professor and Director Academics at the National University of Sciences and Technology (NUST), Pakistan. He received his bachelor’s degree in Aerospace Engineering from NUST, Pakistan, in 2005 and Ph.D. from Nanyang Technological University (NTU), Singapore, in 2012. He is engaged in graduate teaching and research and heading Computational Aeronautics Lab. In addition to this, he is serving as Director Academics of NUST. The current research interests of Dr. Adnan Maqsood are associated with: Flight Dynamics and Control, Applied & Computational Aerodynamics, Unmanned Air Vehicle (UAV) Systems, Nonlinear Dynamics, and Human Factors in UAVs.

Shagufta Rashid was born in Lahore, Pakistan. She received her M.Sc. and M.Phil. degree in Applied Physics from UET, Pakistan, in 2006 and 2012, respectively, and the Ph.D. degree from the National University of Sciences and Technology (NUST), Islamabad, in 2022. The current research interests of Dr. Shagufta Rashid are associated with: Computational Fluid Dynamics, Applied & Computational Aerodynamics, Plasma Physics, and Thermodynamics.

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Rashid, S., Nawaz, F., Maqsood, A. et al. Effect of opposing jet on aerodynamic and flight stability characteristics of a generic supersonic slender forebody. J Mech Sci Technol 36, 2923–2936 (2022). https://doi.org/10.1007/s12206-022-0524-9

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  • DOI: https://doi.org/10.1007/s12206-022-0524-9

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