Experimental and numerical study of ground vortex interaction in an air-intake

• The airflow field around air-intake related geometries has been investigated experimentally and numerically. The configuration of the experimental set-up is used to model a jet engine running near the ground. The experiments have been carried out using both PIV and LDA techniques in order to obtain the mean and fluctuating velocity field as well as the low speed frequencies related to the system of ground vortices. The LDA data provided frequency data that cannot be obtained from conventional PIV measurements. Additionally, flow visualization, using smoke and different seeding particles have been performed to obtain qualitative information about the flow structures and the ground vortices. Large Eddy Simulation (LES) has been used to study, quantitatively and qualitatively, the flow field and the dynamics of the vortex structures. A comparison of the results in terms of the mean velocity field shows very good agreement between the experimental and the LES results. The computed solution of the flow field is used also to estimate the ingestion of particles into the air-intake. This study proves that small particles can be ingested into the jet engine. The limiting particle size depends on the flow conditions and the distance of the air-intake from the ground as well as its inclination relative to the ground.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Farkostteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Vehicle Engineering (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)

Nyckelord

Air-intake

Ground vortex interaction

Large eddy simulation (LES)

Vortex structure

Computer simulation

Flow visualization

Frequencies

Jet engines

Particle size analysis

Smoke

Aerospace engineering

Large eddy simulation (LES)

Ground vortex interaction

Air-intake

Vortex structure

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