23-191 Pdoc - Free Separation with Harmonic

il y a 4 semaines

Marseille, France CNES - Centre National d'Etudes Spatiales Temps plein

Post-doctorat, 24 mois
- Temps plein
- Moins de 2 ans d’expérience
- Doctorat, Bac+8
- Propulsion

**Mission**:
**==**

The IUSTI's supersonic group has recently developed, in collaboration with CNES through the ATAC research pole, a new academic shock wave induced separation experimental configuration, so called the "Free Separation", referring to the “Free Shock Separation” occurring in overexpanded nozzles. This 2D configuration is using a secondary subsonic flow with a static pressure large enough to promote the separation of the supersonic turbulent boundary layer, generating a detached shear layer which doesn't reattach downstream. From this pioneering configuration, it has been shown that the system has some physical similarities with the classical shock induced separation (shock reflections, compression corner, etc.). Nevertheless, significant differences have been observed when the unsteady properties are considered. In this case, it seems that the system acts as an amplifier of the downstream perturbations, typically from the subsonic secondary flow. An important finding was that the system reacts to the whole range of frequencies for the upstream perturbations originating from the incoming supersonic turbulent boundary layer, but it seems that the interaction is not sensitive to downstream perturbations with frequencies larger than about 1kHz. This project aims to confirm and to complement these first results. The most challenging improvement of the set up will be to develop a new secondary flow, with similar mean properties (velocity, density), but with acoustic modulation controlled in frequency and amplitude. From previous experiments, the amplitude and frequency ranges of this acoustic modulation are known.

Two possibilities will be tested: The first configuration will used classical Hartman-Springer tubes, known to be able to generate in low-speed flows (less than 60ms-1) strong acoustic fields with a frequency defined by their geometry. This system will be implemented in the recompression ramp installed downstream of the secondary flow injection. The second configuration will use corrugated pipes in the secondary flow injection system: such pipes are known to generate intense acoustic fields, again defined from their geometry. This will control the amplitude and frequency imposed to the system in the downstream subsonic region. The analysis of the response of the interaction to these controlled excitations will be the main objective of this project.

The IUSTI's supersonic wind tunnel is well adapted for these experiments. It is a continuous blowing installation (up to 5hours) with constant stagnation conditions (temperature and pressure). This allows to generate free separated configurations with well controlled aerodynamic parameters. The specific metrology developed during previous collaborations with the CNES will be used in this study. The specific dual-PIV system, associated with unsteady wall pressure transducers will allow to derive spectral map in the whole fields for a wide range of frequencies (100Hz

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