The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform

Marc D. Polanka - One of the best experts on this subject based on the ideXlab platform.

  • Unsteady Aerodynamics and Interactions Between a High-Pressure Turbine Vane and Rotor
    Journal of Turbomachinery, 2004
    Co-Authors: Ryan M. Urbassik, J. Mitch Wolff, Marc D. Polanka
    Abstract:

    A set of experimental data is presented investigating the unsteady aerodynamics associated with a high Pressure turbine vane (HPV) and rotor blade (HPB). The data was acquired at the Turbine Research Facility (TRF) of the Air Force Research Laboratory. The TRF is a transient, blowdown facility generating several seconds of experimental data on full scale engine hardware at scaled turbine operating conditions simulating an actual engine environment. The Pressure ratio and freestream Reynolds number were varied for this investigation. Surface unsteady Pressure measurements on the HPV, total Pressure Traverse measurements downstream of the vane, and surface unsteady Pressure measurements for the rotor blade were obtained. The unsteady content of the HPV sur-face was generated by the rotor potential field. The first harmonic decayed more rapidly than the second harmonic with a movement upstream causing the second harmonic to be most influential at the vane throat. The blade unsteadiness appears to be caused by a combination of shock, potential field, and vane wake interactions between the vane and rotor blade. The revolution averaged data resulted in higher unsteadiness than a passing ensemble average for both vane and rotor indicating a need to understand each passage for high cycle fatigue (HCF) effects.

  • Unsteady Aerodynamics and Interactions Between a High Pressure Turbine Vane and Rotor
    Volume 5: Turbo Expo 2004 Parts A and B, 2004
    Co-Authors: Ryan M. Urbassik, J. Mitch Wolff, Marc D. Polanka
    Abstract:

    A set of experimental data is presented investigating the unsteady aerodynamics associated with a high Pressure turbine vane (HPV) and rotor blade (HPB). The data was acquired at the Turbine Research Facility (TRF) of the Air Force Research Laboratory. The TRF is a transient, blowdown facility generating several seconds of experimental data on full scale engine hardware at scaled turbine operating conditions simulating an actual engine environment. The Pressure ratio and freestream Reynolds number were varied for this investigation. Surface unsteady Pressure measurements on the HPV, total Pressure Traverse measurements downstream of the vane, and surface unsteady Pressure measurements for the rotor blade were obtained. The unsteady content of the HPV surface was generated by the rotor potential field. The first harmonic decayed more rapidly than the second harmonic with a movement upstream causing the second harmonic to be most influential at the vane throat. The blade unsteadiness appears to be caused by a combination of shock, potential field, and vane wake interactions between the vane and rotor blade. The revolution averaged data resulted in higher unsteadiness than a passing ensemble average for both vane and rotor indicating a need to understand each passage for high cycle fatigue (HCF) effects.Copyright © 2004 by ASME

Ryan M. Urbassik - One of the best experts on this subject based on the ideXlab platform.

  • Unsteady Aerodynamics and Interactions Between a High-Pressure Turbine Vane and Rotor
    Journal of Turbomachinery, 2004
    Co-Authors: Ryan M. Urbassik, J. Mitch Wolff, Marc D. Polanka
    Abstract:

    A set of experimental data is presented investigating the unsteady aerodynamics associated with a high Pressure turbine vane (HPV) and rotor blade (HPB). The data was acquired at the Turbine Research Facility (TRF) of the Air Force Research Laboratory. The TRF is a transient, blowdown facility generating several seconds of experimental data on full scale engine hardware at scaled turbine operating conditions simulating an actual engine environment. The Pressure ratio and freestream Reynolds number were varied for this investigation. Surface unsteady Pressure measurements on the HPV, total Pressure Traverse measurements downstream of the vane, and surface unsteady Pressure measurements for the rotor blade were obtained. The unsteady content of the HPV sur-face was generated by the rotor potential field. The first harmonic decayed more rapidly than the second harmonic with a movement upstream causing the second harmonic to be most influential at the vane throat. The blade unsteadiness appears to be caused by a combination of shock, potential field, and vane wake interactions between the vane and rotor blade. The revolution averaged data resulted in higher unsteadiness than a passing ensemble average for both vane and rotor indicating a need to understand each passage for high cycle fatigue (HCF) effects.

  • Unsteady Aerodynamics and Interactions Between a High Pressure Turbine Vane and Rotor
    Volume 5: Turbo Expo 2004 Parts A and B, 2004
    Co-Authors: Ryan M. Urbassik, J. Mitch Wolff, Marc D. Polanka
    Abstract:

    A set of experimental data is presented investigating the unsteady aerodynamics associated with a high Pressure turbine vane (HPV) and rotor blade (HPB). The data was acquired at the Turbine Research Facility (TRF) of the Air Force Research Laboratory. The TRF is a transient, blowdown facility generating several seconds of experimental data on full scale engine hardware at scaled turbine operating conditions simulating an actual engine environment. The Pressure ratio and freestream Reynolds number were varied for this investigation. Surface unsteady Pressure measurements on the HPV, total Pressure Traverse measurements downstream of the vane, and surface unsteady Pressure measurements for the rotor blade were obtained. The unsteady content of the HPV surface was generated by the rotor potential field. The first harmonic decayed more rapidly than the second harmonic with a movement upstream causing the second harmonic to be most influential at the vane throat. The blade unsteadiness appears to be caused by a combination of shock, potential field, and vane wake interactions between the vane and rotor blade. The revolution averaged data resulted in higher unsteadiness than a passing ensemble average for both vane and rotor indicating a need to understand each passage for high cycle fatigue (HCF) effects.Copyright © 2004 by ASME

O Krishnaiah V Chetty - One of the best experts on this subject based on the ideXlab platform.

  • a study on recycling of abrasives in abrasive water jet machining
    Wear, 2003
    Co-Authors: Kantha M Babu, O Krishnaiah V Chetty
    Abstract:

    Abstract This paper reports the effect of recycling of local garnet abrasives (origin: southern India) while cutting aluminium using abrasive water jet machining. The influence of Pressure, Traverse rate, and abrasive flow rate on American Foundrymen’s Society grain fineness number, average particle size, depth of cut, top kerf width, bottom kerf width, kerf taper, and surface finish obtained using a specially formulated optimised abrasive test sample have been studied. The performance of the test sample has been compared with that of commercial grade abrasive of mesh size 80. Recycling studies, undertaken with used abrasives after screening out particles less than 90 μm size and also with all particles without screening are reported. It is found that the test sample performed better than mesh size 80 abrasives, in terms of achievable depth of cut and surface finish. Recycled abrasives reduces kerf taper, improving the parallelism of cut surface. These results indicate that the proper selection of abrasive particle size distribution is necessary for achieving improved results. The reusability percentage of test sample of the local abrasives that can be recycled is determined as 81%.

  • studies on recharging of abrasives in abrasive water jet machining
    The International Journal of Advanced Manufacturing Technology, 2002
    Co-Authors: Kantha M Babu, O Krishnaiah V Chetty
    Abstract:

    The objective of this work is to find the effect of the recharging of local garnet abrasives (origin: southern India) while cutting aluminium using abrasive water jet machining. The influence of the specially formulated optimised abrasive test sample, Pressure, Traverse rate, and abrasive flowrate, on the American Foundrymen's Society fineness number, depth of cut, top and bottom kerf width, kerf taper, and surface roughness are studied. The performance of the test sample has been compared with that of commercial grade abrasive with mesh size 80. Additionally, recharging studies are carried out after screening out particles of less than 90 μm. These tests help to determine the optimum recharging required.

M Ramachandra - One of the best experts on this subject based on the ideXlab platform.

  • Effect of process parameters on depth of penetration and topography of AZ91 magnesium alloy in abrasive water jet cutting
    KeAi, 2018
    Co-Authors: C A Niranjan, S Srinivas, M Ramachandra
    Abstract:

    In the present study, the influence of dynamic process parameters such as water Pressure, Traverse speed and abrasive mass flow rate on depth of penetration and surface topography in high strength AZ91 magnesium alloy were investigated using Abrasive Water Jet (AWJ) cutting technology. Process parameters were varied at 3 levels and influences of each parameter on penetration ability were identified using analysis of variance (ANOVA). Contribution of water Pressure and Traverse speed on jet penetration found higher compared to abrasive mass flow rate. Profile projector was used to measure depth of penetration. Microstructural features and topography of cut surfaces were examined using Scanning Electron Microscopy (SEM). Micro cutting and ploughing were observed on the top and bottom portion of the cut which were similar to that of modes of deformation in other ductile materials like aluminium and steel. Surface roughness of cut surfaces was measured using Taylor Hobson surface roughness tester. Surface roughness found higher at higher Traverse speeds and lower at lower Traverse speeds. This study also highlights the suitability of AWJ cutting technology for cutting magnesium and its alloys. Keywords: AZ91 magnesium alloy, Depth of penetration, Profile projector, Topograph

  • Effect of process parameters on depth of penetration and topography of AZ91 magnesium alloy in abrasive water jet cutting
    Journal of Magnesium and Alloys, 2018
    Co-Authors: C A Niranjan, S Srinivas, M Ramachandra
    Abstract:

    Abstract In the present study, the influence of dynamic process parameters such as water Pressure, Traverse speed and abrasive mass flow rate on depth of penetration and surface topography in high strength AZ91 magnesium alloy were investigated using Abrasive Water Jet (AWJ) cutting technology. Process parameters were varied at 3 levels and influences of each parameter on penetration ability were identified using analysis of variance (ANOVA). Contribution of water Pressure and Traverse speed on jet penetration found higher compared to abrasive mass flow rate. Profile projector was used to measure depth of penetration. Microstructural features and topography of cut surfaces were examined using Scanning Electron Microscopy (SEM). Micro cutting and ploughing were observed on the top and bottom portion of the cut which were similar to that of modes of deformation in other ductile materials like aluminium and steel. Surface roughness of cut surfaces was measured using Taylor Hobson surface roughness tester. Surface roughness found higher at higher Traverse speeds and lower at lower Traverse speeds. This study also highlights the suitability of AWJ cutting technology for cutting magnesium and its alloys.

J. Mitch Wolff - One of the best experts on this subject based on the ideXlab platform.

  • Unsteady Aerodynamics and Interactions Between a High-Pressure Turbine Vane and Rotor
    Journal of Turbomachinery, 2004
    Co-Authors: Ryan M. Urbassik, J. Mitch Wolff, Marc D. Polanka
    Abstract:

    A set of experimental data is presented investigating the unsteady aerodynamics associated with a high Pressure turbine vane (HPV) and rotor blade (HPB). The data was acquired at the Turbine Research Facility (TRF) of the Air Force Research Laboratory. The TRF is a transient, blowdown facility generating several seconds of experimental data on full scale engine hardware at scaled turbine operating conditions simulating an actual engine environment. The Pressure ratio and freestream Reynolds number were varied for this investigation. Surface unsteady Pressure measurements on the HPV, total Pressure Traverse measurements downstream of the vane, and surface unsteady Pressure measurements for the rotor blade were obtained. The unsteady content of the HPV sur-face was generated by the rotor potential field. The first harmonic decayed more rapidly than the second harmonic with a movement upstream causing the second harmonic to be most influential at the vane throat. The blade unsteadiness appears to be caused by a combination of shock, potential field, and vane wake interactions between the vane and rotor blade. The revolution averaged data resulted in higher unsteadiness than a passing ensemble average for both vane and rotor indicating a need to understand each passage for high cycle fatigue (HCF) effects.

  • Unsteady Aerodynamics and Interactions Between a High Pressure Turbine Vane and Rotor
    Volume 5: Turbo Expo 2004 Parts A and B, 2004
    Co-Authors: Ryan M. Urbassik, J. Mitch Wolff, Marc D. Polanka
    Abstract:

    A set of experimental data is presented investigating the unsteady aerodynamics associated with a high Pressure turbine vane (HPV) and rotor blade (HPB). The data was acquired at the Turbine Research Facility (TRF) of the Air Force Research Laboratory. The TRF is a transient, blowdown facility generating several seconds of experimental data on full scale engine hardware at scaled turbine operating conditions simulating an actual engine environment. The Pressure ratio and freestream Reynolds number were varied for this investigation. Surface unsteady Pressure measurements on the HPV, total Pressure Traverse measurements downstream of the vane, and surface unsteady Pressure measurements for the rotor blade were obtained. The unsteady content of the HPV surface was generated by the rotor potential field. The first harmonic decayed more rapidly than the second harmonic with a movement upstream causing the second harmonic to be most influential at the vane throat. The blade unsteadiness appears to be caused by a combination of shock, potential field, and vane wake interactions between the vane and rotor blade. The revolution averaged data resulted in higher unsteadiness than a passing ensemble average for both vane and rotor indicating a need to understand each passage for high cycle fatigue (HCF) effects.Copyright © 2004 by ASME