Experimental wind tunnel tests, conducted to reproduce the base flow past a space launcher during early ascent fight conditions, were numerically simulated by solving the steady Reynolds-averaged Navier-Stokes equations using two different versions of the Spalart-Allmaras model. The launcher model consisted of a cylinder with a circular cross section, an ogival nose, and a centered nozzle that issued a supersonic cold jet embedded in the external subsonic stream.Acomparative analysis of the data obtained from the steady-state simulations and from the experimental tests indicated that the launcher base pressure was closely related to the turbulent shear stresses within the jet mixing layer; therefore, accurate modeling of the compressibility effects in the turbulent mixing layer plays an important role in improving the base drag estimates provided by the numerical simulations.

Turbulence modeling of base drag on launcher in subsonic flight / Paciorri, Renato; Sabetta, Filippo; A., Bonfiglioli. - In: JOURNAL OF SPACECRAFT AND ROCKETS. - ISSN 0022-4650. - STAMPA. - 51(2014), pp. 1673-1680. [10.2514/1.A32757]

Turbulence modeling of base drag on launcher in subsonic flight

PACIORRI, Renato;SABETTA, Filippo;
2014

Abstract

Experimental wind tunnel tests, conducted to reproduce the base flow past a space launcher during early ascent fight conditions, were numerically simulated by solving the steady Reynolds-averaged Navier-Stokes equations using two different versions of the Spalart-Allmaras model. The launcher model consisted of a cylinder with a circular cross section, an ogival nose, and a centered nozzle that issued a supersonic cold jet embedded in the external subsonic stream.Acomparative analysis of the data obtained from the steady-state simulations and from the experimental tests indicated that the launcher base pressure was closely related to the turbulent shear stresses within the jet mixing layer; therefore, accurate modeling of the compressibility effects in the turbulent mixing layer plays an important role in improving the base drag estimates provided by the numerical simulations.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11573/618704
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