Effect of Throttling on Dual-Bell Sneak-Transition Side Loads

2021 ◽  
pp. 1-11
Author(s):  
Shashi B. Verma ◽  
Oskar J. Haidn
Keyword(s):  
Dual Bell

Active Control of Dual-Bell Nozzle Operation Mode Transition by Film Cooling and Mixture Ratio Variation

2020 ◽  
Vol 36 (1) ◽  
pp. 47-58 ◽  
Author(s):  
Dirk Schneider ◽  
Ralf Stark ◽  
Chloé Génin ◽  
Michael Oschwald ◽  
Konstantin Kostyrkin
Keyword(s):  
Active Control ◽  
Film Cooling ◽  
Operation Mode ◽  
Mode Transition ◽  
Mixture Ratio ◽  
Ratio Variation ◽  
Dual Bell

scholarly journals Numerical Analysis of Side-loads Reduction in a Sub-scale Dual-bell Rocket Nozzle

2021 ◽  
Author(s):  
M. Cimini ◽  
E. Martelli ◽  
M. Bernardini
Keyword(s):  
Inflection Point ◽  
Pressure Ratio ◽  
Mean Value ◽  
Detached Eddy Simulation ◽  
Turbulent Structures ◽  
Eddy Simulation ◽  
Separation Shock ◽  
Delayed Detached Eddy Simulation ◽  
Controlled Flow ◽  
Dual Bell

AbstractA calibrated delayed detached eddy simulation of a sub-scale cold-gas dual-bell nozzle flow at high Reynolds number and in sea-level mode is carried out at nozzle pressure ratio NPR = 45.7. In this regime the over-expanded flow exhibits a symmetric and controlled flow separation at the inflection point, that is the junction between the two bells, leading to the generation of a low content of aerodynamic side loads with respect to conventional bell nozzles. The nozzle wall-pressure signature is analyzed in the frequency domain and compared with the experimental data available in the literature for the same geometry and flow conditions. The Fourier spectra in time and space (azimuthal wavenumber) show the presence of a persistent tone associated to the symmetric shock movement. Asymmetric modes are only slightly excited by the shock and the turbulent structures. The low mean value of the side-loads magnitude is in good agreement with the experiments and confirms that the inflection point dampens the aero-acoustic interaction between the separation-shock and the detached shear layer.

Parametric study of supersonic film cooling in dual bell nozzle for an experimental air–kerosene engine

2018 ◽  
Vol 78 ◽  
pp. 364-376 ◽  
Author(s):  
Siba Prasad Choudhury ◽  
Abhilash Suryan ◽  
J.C. Pisharady ◽  
A. Jayashree ◽  
Khalid Rashid
Keyword(s):  
Parametric Study ◽  
Film Cooling ◽  
Dual Bell

Dual-bell nozzle for space launchers with fluidic control of transition

2021 ◽  
Author(s):  
Andrea Ferrero ◽  
Antonietta Conte ◽  
Emanuele Martelli ◽  
Francesco Nasuti ◽  
Dario Pastrone
Keyword(s):  
Fluidic Control ◽  
Dual Bell

Numerical Investigation of Jet-Wake Interaction for a Dual-Bell Nozzle

2019 ◽  
Vol 104 (2-3) ◽  
pp. 553-578 ◽  
Author(s):  
Simon Loosen ◽  
Matthias Meinke ◽  
Wolfgang Schröder
Keyword(s):  
Numerical Investigation ◽  
Wake Interaction ◽  
Dual Bell

LOX/CH4 Hot-Flow Testing of Dual-Bell Nozzles with Rapid-Expansion Extension

2018 ◽  
Vol 34 (5) ◽  
pp. 1214-1224 ◽  
Author(s):  
Hidemi Takahashi ◽  
Takeo Tomita ◽  
Chloé Génin ◽  
Dirk Schneider
Keyword(s):  
Rapid Expansion ◽  
Dual Bell
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