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A fluidic thrust vector control using the bypass flow in a dual throat nozzle

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Abstract

The present study is to explore an active mass flow control technology for an emerging bypass dual throat nozzle. A new arc-shaped bypass system has been applied to replace the previous V-shaped bypass for the bypass dual throat nozzle, which can decrease the total pressure loss significantly. The bypass passage has a contraction part with a variable area ratio. The vector control effectiveness is discussed with different contraction area ratios of the bypass passage. The obtained results reveal that friction choking and geometry choking play crucial roles to affect the bypass mass flow, respectively. When the bypass passage is fully open, the choking location of the bypass flow occurs at the bypass exit, owing to the viscous boundary layer along the constant area passage. A contraction area ratio less than 0.5 does not change the choking position of the bypass flow, because the viscous boundary layer is larger than the geometry contraction height. While the contraction area ratio reaches or exceeds 0.5, the geometry choking takes place in the contraction section. The vectoring angle and bypass mass flow ratio decrease with an increase in the contraction area ratio, whereas thrust coefficient, thrust efficiency, and total pressure loss increase.

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Abbreviations

A e :

Exit area

AR :

Area ratio

C f :

Thrust coefficient

F h :

Horizontal force

F b :

Ideal bypass flow thrust

F i, p :

Ideal mainstream thrust

F r :

Real force

F v :

Vertical force

H 1 :

Nozzle inlet height

H b :

Bypass height

H bt :

Bypass throat height

H e :

Nozzle exit height

H t :

Nozzle throat height

L d-c :

Cavity length

\(\dot m\) :

Total mass flow rate

\({\dot m_b}\) :

Mass flow rate through the bypass passage

\({\dot m_p}\) :

Mass flow rate through the nozzle

M :

Mach number

NPR :

Nozzle pressure ratio (P0/Pb)

P 0 :

Stagnation pressure

P b :

Back-pressure

P e :

Area-weighted average pressure

P w :

Static pressure on the bottom cavity wall

R g :

Gas constant

T 0 :

Stagnation temperature

U ex :

Horizontal velocity

U ey :

Vertical velocity

X :

Axial distance

η :

Thrust efficiency

ρ :

Density

γ :

Specific heat ratio

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Acknowledgments

The work is supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. NRF-2016R1A2B3016436).

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Authors and Affiliations

  1. Faculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou, China

    Kexin Wu

  2. Department of Mechanical Engineering, Andong National University, Andong, Korea

    Kexin Wu & HeuyDong Kim

Authors
  1. Kexin Wu
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  2. HeuyDong Kim
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Corresponding author

Correspondence to HeuyDong Kim.

Additional information

Kexin Wu received his Double M.S. degrees in Mechanical Engineering from Zhejiang Sci-Tech University, China & Andong National University, Republic of Korea, in March 2018. He obtained his Ph.D. degree in Mechanical Engineering from Andong National University, Korea, in February 2021. Currently, Dr. Wu is working as an Associate Professor at Zhejiang Sci-Tech University, China. His research interests involve thrust vector control, shock wave detachment criterion, pseudo-steady shock wave reflection, heat transfer, and fluid machinery.

Heuy-Dong Kim received his Ph.D. from Kyushu University, Japan, in 1991. Dr. Kim is currently a Full Professor at the Department of Mechanical Engineering in Andong National University, Korea. Professor Kim is interested in research areas related to compressible flows including shock wave turbulent boundary layer interactions, thrust vector control, unsteady internal flows, shock tube & supersonic wind tunnel technologies, fluid machinery of high-speed flows, the medical applications of the shock wave, and the supercritical fluid dyeing process of textiles.

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Wu, K., Kim, H. A fluidic thrust vector control using the bypass flow in a dual throat nozzle. J Mech Sci Technol 35, 3435–3443 (2021). https://doi.org/10.1007/s12206-021-0716-8

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  • DOI: https://doi.org/10.1007/s12206-021-0716-8

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