... spot” features on blade tip surfaces are attributed to enhanced turbulence thermal diffusion in local regions. Other surface heat-transfer variations are attributed to flow variations induced by shock waves. Flow structure and surface heat-transfer variations are also investigated numerically when...

... reaching 1.8. Unlike other low-speed data in the open literature, the turbine blade tip heat transfer is greatly influenced by the shock wave structure inside the tip gap. Oblique shock waves are initiated near the pressure-side edge of the tip, prior to being reflected multiple times between the casing...

... as an indicator for the onset of the self-induced unsteadiness in tip leakage flow. It is discussed that the interaction between shock wave and tip leakage vortex does not initiate the self-induced unsteadiness, but might be the cause of other types of unsteadiness, such as broad-banded turbulence unsteadiness...

... compressors computational fluid dynamics fast Fourier transforms flow instability numerical analysis rotors shock waves transonic flow vortices Advances in gas turbine engine technology have made possible the production of highly efficient engines. However, the useful operating range of a gas...

... transducers shock waves transonic flow turbines wakes To meet the objective of reduced costs and more compactness of turbomachinery, it is advantageous to reduce the number of stages resulting in high-pressure (HP) ratios and transonic conditions for these stages. To keep the efficiency at a high...

... for the other two conditions. The rotor flow field is dominated by the strong interaction between blade rows. Of particular interest is the actual effect of shock waves on the convective heat transfer rates. The rotor crown is submitted periodically to the trailing edge shocks that cause major...

... Dampers on Rotating Blade Row Performance Near Design Point ,” NASA Paper No. TM X-2696. Benser , W. A. , Bailey , E. E. , and Gelder , T. F. , 1975 , “ Holographic Studies of Shock Waves Within Transonic Fan Rotors ,” ASME J. Eng. Power 0022-0825 , 97 , pp. 75 – 84 . Reid...

... by a vaned diffuser. The inlet flow to the open shrouded impeller is transonic, thus giving rise to interactions between shock waves and boundary layers and between shock waves and tip leakage vortices. These interactions generate complex flow structures which are convected and distorted through the impeller...

.... , 2005 , “ Unsteady Aerodynamics and Aeroacoustics of a High-Bypass Ratio Fan Stage ,” ASME J. Turbomach. 0889-504X 10.1115/1.1811103 , 127 , pp. 64 – 75 . Morfey , C. L. , and Fisher , M. J. , 1970 , “ Shock-Wave Radiation from a Supersonic Ducted Rotor ,” Aeronaut. J. 0001...

... rotor-locked shock wave field. The spatial evolution of this shock system is studied numerically for flows through two basic hard-walled configurations: a slender nacelle with large throat area and a thick nacelle with reduced throat area. With the flight Mach number set to 0.25, the spatial evolution...

... and found to correlate with the vortex blockage. 01 10 2004 01 02 2005 shock tubes shock waves compressors stators flow instability blades Mach number transonic flow supersonic flow rotors wind tunnels vortices The trend toward higher stage loadings in axial compressors...

... downstream of the shock. Similar results can be found for the 3D transitional computation with the model of CH. 01 10 2004 01 02 2005 aerospace engines Navier-Stokes equations flow simulation design blades compressors fans transonic flow shock waves flow separation flow...

... efficiency. Wake-shock interaction has been the subject of only a few experimental and numerical investigations. Ottavy et al. ( 11 12 ) made laser two-focus anemometer measurements between an IGV and a transonic rotor. Upstream of the shock wave the IGV wake depth was reduced and the wake...

..., the flow distortion due to the shock wave and the shock boundary layer interaction must have a large effect on the flow in the inducer. In order to ensure the reliability of aerodynamic design technology, the actual supersonic flow phenomena with a shock wave must be ascertained using measurement...

... revision March 1, 2004. IGTI Review Chair: A. J. Strazisar. 13 June 2004 01 October 2003 01 March 2004 29 12 2004 thermoacoustics shock waves flow instability impedance matrix eigenvalues and eigenfunctions boundary-value problems The unsteady flows...

... June 2003 01 Dec 2002 01 Mar 2003 03 09 2004 wakes computational fluid dynamics turbines aerodynamics clocks viscosity measurement shock waves The real flow in multistage turbomachines is inherently unsteady because of the relative blade row motion. This causes...

.... 03 June 2002 22 October 2001 27 08 2003 transonic flow compressibility computational fluid dynamics shock waves Transonic Compressor Streamline Curvature Loss Deviation Accurate and robust turbomachinery off-design performance prediction remains elusive...

... a moving shock wave that produces an entropy rise and loss is experienced. The effect of this outcome of blade-row interaction is to lower the efficiency, pressure ratio, and mass flow rate observed as blade-row axial spacing is reduced from far to close. The magnitude of loss production is affected...

... growth on the blades and end walls. Both of these can have a beneficial impact on the efficiency. boundary layers compressors flow measurement transonic flow shock waves rotors stators 01 12 2001 01 03 2003 2005 American Society of Mechanical Engineers ...

... 2002 31 January 2002 23 01 2003 gas turbines rotational flow flow instability wakes shock waves Mach number rotors The motion of the rotor, relative to the upstream vane and downstream vane causes the surface of the rotor to be subjected to an unsteady pressure field...