[PDF] Top 20 Unsteady flow phenomena in an axial flow compressor

... a consideration of measurements and potential flow model calculations has indicated that "potential flow" absolute velocity'defects downstream of the rotor are only about 20% of the defe[r] ... See full document

... separated flow regions as well as laminar-turbulent transitional flow ...a compressor stator blade at the Uni- versity of ...transitional flow regimes, but it required manual adjustment of the ... See full document

... the compressor to operate at the same operating points used in previous studies to allow comparisons between measurements made both with and without the ...the compressor hub and casing ...the ... See full document

... When a laminar boundary layer separates from the surface, as is possible for regions of flow subjected to strong adverse pressure gradients typical on turbomachinery blading, transition [r] ... See full document

... system flow range—from choke to stall inception—and also to accurately calculate fundamental aerothermodynamic performance ...unstable, unsteady, chaotic stall inception process; as part of these efforts, ... See full document

... the flow field in unstable condition, especially in Gas-Turbine engines, has mainly been based on experimental observations and studies during last decay ...The axial compressors with their adverse pressure ... See full document

... study unsteady flow interactions between adjacent blade rows in compressors and ...The flow solver uses a hybrid approach that solves the thin layer Navier– Stokes (N–S) equations on an O-mesh around ... See full document

... at compressor inlet is used to generate turbulence char- acteristics similar to those occurring in an embedded stage in a multi-stage axial com- ...inlet flow is studied using hot-wire anemometry and ... See full document

... In this work, the in-house numerical code for solving compressible, turbulent and inviscid, steady and un- steady, two-dimensional and three-dimensional flow in the stator-rotor system was developed. Temporal behaviour of ... See full document

... clearance flow in axial compressors can significantly affect their performance and stable ...leakage flow in a low speed isolated axial compressor rotor blades ...leakage flow ... See full document

... and flow angle were performed using a new ...and flow angle were averaged to remove effects associated with the potential field of the stator blade ...pitchwise flow field; however, it has the ... See full document

... In the first stage, a laminar boundary layer has grown in thickness to the point where small disturbances in the flow may be amplified. These initial disturbances can originate from a range of possible sources, ... See full document

... the flow around flat plate aerofoils with circular arc leading edge profiles have shown that a separation bubble will often form near the leading edge blend point [5, 44, 45, ...of unsteady flow on ... See full document

... secondary flow behaviour, particularly at high compressor loading where the adverse pressure gradient causes the hub boundary layer to ...to flow deflections for each blade ... See full document

... Standard compressor testing procedures allow for Mach number similarity between the test and reference conditions through a correction process for rotational speed, but there is no prescribed method to also ... See full document

... the axial direction by the blade camber and the effective flow area is increased from inlet to outlet, thus causing diffusion to ...the axial direction and further pressure rise ... See full document

... circumferential position of stator leading edge relative to IGV trailing edge axial distance from stator leading edge to probe axial distance from rotor leading edge to probe axial dista[r] ... See full document

... ions take the place of the counter ions as we progress away from the charged surface. Debye length is therefore a critical design parameter in controlling the electrical potential distri- bution. Fig. 2(b) depicts that ... See full document

... leakage flow is one of the mainstream characteristics in aero engine compressor, and stator root leakage plays a significant role in this ...of compressor stator blades, and both of them have ... See full document

... 1 A numerical study of the unsteady flow phenomena in human swimming 2 Steffen Pacholak1, Stefan Hochstein2, Alexander Rudert1, Christoph Brücker1 3 1 Institute of Mechanics and Fluid Dy[r] ... See full document