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Corresponding Author

Khater, R.

Subject Area

Mechanical Power Engineering

Article Type

Original Study

Abstract

The structure of a curved flow created by an annular jet impinging on a flat plate has been investigated in the present experimental model. As the curvature of the jet can be controlled by the gap between the jet exit and the impingement plate hence the flow can be simply analyzed in terms of the internal pressure which is generated by the rate of change of moinenturn due to the jet being turned through 90°. Measurements of the velocity profiles across the jet and tile pressure distribution along the impingement plate have been conducted for different jet curvature and inlet velocity. The velocity profiles across the jet and the turbulence parameters were measured using a Fiber Optics back scattering Laser Doppler Anemometer(LDA) system connected to a Burst Spectrum Analyzer (BSA) [or data processing. Examination of (he velocity measurements and pressure distribution along Ute impingement plate indicated a strong curvature of the jet and high turbulence circulation and swirl within various vortex regions across the flow field. It is found that the difference in the jet entrained rate and the pressure field in the outer and the inner annular regions are responsible for the difference in the displacement of both the mean velocity and the turbulence intensity profiles outward the central axis of the jet. The variation of the pressure field from slightly sub-atmospheric to a maximum at the stagnation point and into the recirculation bubble is detected. The variation of the normalized stagnation pressure is correlated with the normalized ground height by a linear equation. within the range of the present experimental data.

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