tailieunhanh - UNSTEADY AERODYNAMICS, AEROACOUSTICS AND AEROELASTICITY OF TURBOMACHINES Episode 11

Tham khảo tài liệu 'unsteady aerodynamics, aeroacoustics and aeroelasticity of turbomachines episode 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | DPIV Measurements of Flow between a Transonic Rotor and Upstream Stator 517 wake generator. An observation made from the instantaneous fbw visualization images not presented here suggest a phase locking of the wake shedding to the bow wave perturbation but random motion of the vortices as they con-vect downstream. At far spacing two or three shed vortices are present at any given time in the gap between the wake generator and rotor. At close spacing there is only one vortex present. As a result the averaged instantaneous images at far spacing do not show as clear a view of the wake region as close spacing. Nevertheless plots of median velocity still illustrate important details of the far spacing ft wfield. Analysis of Fig. 5 shows bands of low and high velocity in the ft w field that are a result of the rotor bow shock and expansion zone. At far spacing the rotor bow shock is not as well defined because it is weaker than at close spacing. This is evident from the peak velocity magnitude observed in the DPIV images. The peak velocity at far spacing is approximately 220 m s while at close spacing it is 245 m s. Due to the increased axial gap between the rotor leading edge and wake generator the rotor bow shock has dissipated into more of a bow wave at the location it interacts with the wake generator trailing edge. The wake generator wake has mixed out more resulting in a wider and shallower wake. The interaction of a weaker wake with a weaker bow shock does not split the rotor bow shock into two clearly defined regions such as was observed at close spacing. 5. Summary A DPIV system for use in transonic turbomachinery has been described. Results from an experiment conducted in the SMI rig are presented that show the complex ft w field associated with the interaction of a downstream transonic rotor with an upstream stator. The effect of changing the axial gap between blade-rows is studied and the DPIV plots are presented as an experimental data set for time accurate

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