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J. K. Gruver - One of the best experts on this subject based on the ideXlab platform.
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Laser Velocimeter Measurements in the Pump of an Automotive Torque Converter: Part II—Unsteady Measurements
Journal of Turbomachinery, 1996Co-Authors: K. Brun, R. D. Flack, J. K. GruverAbstract:The unsteady velocity field found in the Pump of an automotive torque converter was measured using laser velocimetry. Velocities in the Inlet, mid-, and exit planes of the Pump were investigated at two significantly different operating conditions: turbine/Pump rotational speed ratios of 0.065 and 0.800. A data organization method was developed to visualize the three-dimensional, periodic unsteady velocity field in the rotating frame. For this method, the acquired data are assumed to be periodic at synchronous and blade interaction frequencies. Two shaft encoders were employed to obtain the instantaneous angular position of the torque converter Pump and turbine at the instant of laser velocimeter data acquisition. By proper “registration” of the data, visualizing the transient interaction effects between the stator and the Pump, and between the Pump and the turbine, was possible. Results showed strong cyclic velocity fluctuations in the Pump Inlet plane as a function of the relative stator-Pump position. Typical percent periodic fluctuations in the through flow velocity were 70 percent of the average throughflow velocity. The upstream propagation influence of the turbine on the Pump exit plane flow field was seen to be smaller. Percent periodic fluctuations of the throughflow velocity were typically 30 percent. The effect of the stator and turbine on the midplane flow field was seen to be negligible. The incidence angle at the Pump Inlet fluctuated by 27 and 14 deg for the 0.065 and 0.800 speed ratios, respectively. Typical slip factors at the exit were 0.965 and fluctuated by less than 1 percent.
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Laser Velocimeter Measurements in the Pump of an Automotive Torque Converter: Part II — Unsteady Measurements
Volume 1: Turbomachinery, 1994Co-Authors: K. Brun, R. D. Flack, J. K. GruverAbstract:The unsteady velocity field found in the Pump of an automotive torque converter was measured using laser velocimetry. Velocities in the Inlet, mid-, and exit planes of the Pump were investigated at two significantly different operating conditions: turbine/Pump rotational speed ratios of 0.065, and 0.800. A data organization method was developed to visualize the three dimensional, periodic unsteady velocity field in the rotating frame. For this method, the acquired data is assumed to be periodic at synchronous and blade interaction frequencies. Two shaft encoders were employed to obtain the instantaneous angular position of the torque converter Pump and turbine at the instant of laser velocimeter data acquisition. By proper “registration” of the data visualizing the transient interaction effects between the stator and the Pump, and the Pump and the turbine was possible. Results showed strong cyclic velocity fluctuations in the Pump Inlet plane as a function of the relative stator-Pump position. Typical percent periodic fluctuations in the through flow velocity were 70% of the average through flow velocity. The upstream propagation influence of the turbine on the Pump exit plane flow field was seen to he smaller. Percent periodic fluctuations of the through flow velocity were typically 30%. The effect of the stator and turbine on the mid-plane flow field was seen to be negligible. The incidence angle at the Pump Inlet fluctuated by 27° and 14° for the 0.065 and 0.800 speed ratios, respectively. Typical slip factors at the exit were 0.965 and fluctuated by less than 1%.
K. Brun - One of the best experts on this subject based on the ideXlab platform.
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Laser Velocimeter Measurements in the Pump of an Automotive Torque Converter: Part II—Unsteady Measurements
Journal of Turbomachinery, 1996Co-Authors: K. Brun, R. D. Flack, J. K. GruverAbstract:The unsteady velocity field found in the Pump of an automotive torque converter was measured using laser velocimetry. Velocities in the Inlet, mid-, and exit planes of the Pump were investigated at two significantly different operating conditions: turbine/Pump rotational speed ratios of 0.065 and 0.800. A data organization method was developed to visualize the three-dimensional, periodic unsteady velocity field in the rotating frame. For this method, the acquired data are assumed to be periodic at synchronous and blade interaction frequencies. Two shaft encoders were employed to obtain the instantaneous angular position of the torque converter Pump and turbine at the instant of laser velocimeter data acquisition. By proper “registration” of the data, visualizing the transient interaction effects between the stator and the Pump, and between the Pump and the turbine, was possible. Results showed strong cyclic velocity fluctuations in the Pump Inlet plane as a function of the relative stator-Pump position. Typical percent periodic fluctuations in the through flow velocity were 70 percent of the average throughflow velocity. The upstream propagation influence of the turbine on the Pump exit plane flow field was seen to be smaller. Percent periodic fluctuations of the throughflow velocity were typically 30 percent. The effect of the stator and turbine on the midplane flow field was seen to be negligible. The incidence angle at the Pump Inlet fluctuated by 27 and 14 deg for the 0.065 and 0.800 speed ratios, respectively. Typical slip factors at the exit were 0.965 and fluctuated by less than 1 percent.
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Laser Velocimeter Measurements in the Pump of an Automotive Torque Converter: Part II — Unsteady Measurements
Volume 1: Turbomachinery, 1994Co-Authors: K. Brun, R. D. Flack, J. K. GruverAbstract:The unsteady velocity field found in the Pump of an automotive torque converter was measured using laser velocimetry. Velocities in the Inlet, mid-, and exit planes of the Pump were investigated at two significantly different operating conditions: turbine/Pump rotational speed ratios of 0.065, and 0.800. A data organization method was developed to visualize the three dimensional, periodic unsteady velocity field in the rotating frame. For this method, the acquired data is assumed to be periodic at synchronous and blade interaction frequencies. Two shaft encoders were employed to obtain the instantaneous angular position of the torque converter Pump and turbine at the instant of laser velocimeter data acquisition. By proper “registration” of the data visualizing the transient interaction effects between the stator and the Pump, and the Pump and the turbine was possible. Results showed strong cyclic velocity fluctuations in the Pump Inlet plane as a function of the relative stator-Pump position. Typical percent periodic fluctuations in the through flow velocity were 70% of the average through flow velocity. The upstream propagation influence of the turbine on the Pump exit plane flow field was seen to he smaller. Percent periodic fluctuations of the through flow velocity were typically 30%. The effect of the stator and turbine on the mid-plane flow field was seen to be negligible. The incidence angle at the Pump Inlet fluctuated by 27° and 14° for the 0.065 and 0.800 speed ratios, respectively. Typical slip factors at the exit were 0.965 and fluctuated by less than 1%.
Liviu Eugen Anton - One of the best experts on this subject based on the ideXlab platform.
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Investigation and Analysis of the Flow Field Induced by a Symmetrical Suction Elbow at the Pump Inlet
Volume 3B: Fluid Applications and Systems, 2019Co-Authors: Sebastian Muntean, Alin Ilie Bosioc, Ionel Drăghici, Liviu Eugen AntonAbstract:Abstract The Pump Inlet casing deflects the fluid flow from the Inlet pipe, mainly arranged normally to the axis, into the axial direction. The Pump Inlet casing can take a large variety of geometrical shapes from curved pipes to three-dimensional elbows. The hydrodynamic field induced by symmetrical suction elbow (SSE) at the Pump Inlet is experimentally investigated in order to quantify it effects at the Pump Inlet. The Pump test rig and the experimental setup are detailed. A SSE model is installed at the Pump Inlet. Laser Doppler Velocimetry (LDV) measurements are performed on the annular cross section located at the Pump Inlet. As a result, the map of the velocity field is determined quantifying the non-uniformities induced by SSE. Next, the full 3D turbulent numerical investigation of the flow in the SSE is performed. The numerical results on the annular cross section are qualitatively and quantitatively validated against LDV data. A good agreement between numerical results and experimental data is obtained. The hydrodynamic flow structure with several pairs of vortices is identified examining the vorticity field. However, two pairs of vortices with largest contribution to the flow non-uniformity are examined. Three parameters are considered to quantify the evolution of each vortex center: two geometrical quantities (e.g. the radial and angular coordinates) and one hydrodynamic (the magnitude of vorticity). The largest values of the vorticity magnitude are identified in the center of both vortices located behind the shaft. The 3D distribution of the vortex core filaments is visualized. As a result, the 3D geometry of the SSE and the Pump shaft are identified as the main sources of the flow non-uniformity at the Pump Inlet. This deep analysis of the 3D flow field induced by the SSE paves the way towards an improved geometry with practical applications to real Pump and Pump-turbines.
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Hydrodynamic Analysis of the Flow Field Induced by a Symmetrical Suction Elbow at the Pump Inlet
IOP Conference Series: Earth and Environmental Science, 2016Co-Authors: Sebastian Muntean, Alin Ilie Bosioc, I Drǎghici, Liviu Eugen AntonAbstract:The paper investigates the hydrodynamic field generated by the symmetrical suction elbow at the Pump impeller Inlet. The full three-dimensional turbulent numerical investigation of the flow in the symmetrical suction elbow is performed using FLUENT then the flow non-uniformity generated by it is numerically computed. The numerical results on the annular cross section are qualitatively and quantitatively validated against LDV data. A good agreement between numerical results and experimental data is obtained on this cross section located downstream to the suction elbow and upstream to the Pump impeller. The hydrodynamic flow structure with four vortices is identified plotting the vorticity field. The largest values of the vorticity magnitude are identified in the center of both vortices located behind the shaft. The vortex core location is plotted on four annular cross sections located along to the cylindrical part between the suction elbow and the Pump Inlet. Also, the three-dimensional distribution of the vortex core filaments is visualized and extracted. The shapes of vortex core filaments located behind the Pump shaft agree well with its visualization performed on the test rig. As a result, the three-dimensional complex geometry of the suction elbow and the Pump shaft are identified as the main sources of the flow non-uniformity at the Pump Inlet.
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LDV measurements of the velocity field on the Inlet section of a Pumped storage equipped with a symmetrical suction elbow for variable discharge values
IOP Conference Series: Earth and Environmental Science, 2014Co-Authors: I Drǎghici, Alin Ilie Bosioc, Sebastian Muntean, Liviu Eugen AntonAbstract:The storage Pumps are equipped with various types of Inlet casings. The flow nonuniformity is generated by the suction elbows being ingested by the impeller leading to unsteady phenomena and worse cavitational behaviour. A symmetrical suction elbow model corresponding to the double flux storage Pump was manufactured and installed on the test rig in order to assess the flow field at the Pump Inlet. The experimental investigations are performed for 9 discharge values from 0.5 to 1.3 of nominal discharge. LDV measurements are performed on the annular section of the Pump Inlet in order to quantify the flow non-uniformity generated by the symmetrical suction elbow. Both axial and circumferential velocity components are simultaneously measured on the half plane (180°) of the annular Inlet section along to 19 survey axis with 62 points on each. The flow field on the next half plane is determined tacking into account the symmetry. As a result, the flow map on the Pump Inlet annular section is reconstructed revealing a significant variation of the circumferential velocity component. The absolute flow angle is computed showing a significant variation of ±38°.
R. D. Flack - One of the best experts on this subject based on the ideXlab platform.
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Laser Velocimeter Measurements in the Pump of an Automotive Torque Converter: Part II—Unsteady Measurements
Journal of Turbomachinery, 1996Co-Authors: K. Brun, R. D. Flack, J. K. GruverAbstract:The unsteady velocity field found in the Pump of an automotive torque converter was measured using laser velocimetry. Velocities in the Inlet, mid-, and exit planes of the Pump were investigated at two significantly different operating conditions: turbine/Pump rotational speed ratios of 0.065 and 0.800. A data organization method was developed to visualize the three-dimensional, periodic unsteady velocity field in the rotating frame. For this method, the acquired data are assumed to be periodic at synchronous and blade interaction frequencies. Two shaft encoders were employed to obtain the instantaneous angular position of the torque converter Pump and turbine at the instant of laser velocimeter data acquisition. By proper “registration” of the data, visualizing the transient interaction effects between the stator and the Pump, and between the Pump and the turbine, was possible. Results showed strong cyclic velocity fluctuations in the Pump Inlet plane as a function of the relative stator-Pump position. Typical percent periodic fluctuations in the through flow velocity were 70 percent of the average throughflow velocity. The upstream propagation influence of the turbine on the Pump exit plane flow field was seen to be smaller. Percent periodic fluctuations of the throughflow velocity were typically 30 percent. The effect of the stator and turbine on the midplane flow field was seen to be negligible. The incidence angle at the Pump Inlet fluctuated by 27 and 14 deg for the 0.065 and 0.800 speed ratios, respectively. Typical slip factors at the exit were 0.965 and fluctuated by less than 1 percent.
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Laser Velocimeter Measurements in the Pump of an Automotive Torque Converter: Part II — Unsteady Measurements
Volume 1: Turbomachinery, 1994Co-Authors: K. Brun, R. D. Flack, J. K. GruverAbstract:The unsteady velocity field found in the Pump of an automotive torque converter was measured using laser velocimetry. Velocities in the Inlet, mid-, and exit planes of the Pump were investigated at two significantly different operating conditions: turbine/Pump rotational speed ratios of 0.065, and 0.800. A data organization method was developed to visualize the three dimensional, periodic unsteady velocity field in the rotating frame. For this method, the acquired data is assumed to be periodic at synchronous and blade interaction frequencies. Two shaft encoders were employed to obtain the instantaneous angular position of the torque converter Pump and turbine at the instant of laser velocimeter data acquisition. By proper “registration” of the data visualizing the transient interaction effects between the stator and the Pump, and the Pump and the turbine was possible. Results showed strong cyclic velocity fluctuations in the Pump Inlet plane as a function of the relative stator-Pump position. Typical percent periodic fluctuations in the through flow velocity were 70% of the average through flow velocity. The upstream propagation influence of the turbine on the Pump exit plane flow field was seen to he smaller. Percent periodic fluctuations of the through flow velocity were typically 30%. The effect of the stator and turbine on the mid-plane flow field was seen to be negligible. The incidence angle at the Pump Inlet fluctuated by 27° and 14° for the 0.065 and 0.800 speed ratios, respectively. Typical slip factors at the exit were 0.965 and fluctuated by less than 1%.
Heng Yaguang - One of the best experts on this subject based on the ideXlab platform.
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Experimental and Numerical Analysis on Flow Characteristics in a Double Helix Screw Pump
Energies, 2019Co-Authors: Zhang Weibin, Liu Xiaobing, Qifeng Jiang, Gérard Bois, Yuan Shuai, Heng YaguangAbstract:Experimental overall performances on a double helix screw Pump are presented and discussed, focusing on the leakage flow for two different rotational speeds. A comparison between experimental and URANS CFD approaches is performed in order to check the CFD closure models’ validity. Some specific local flow characteristics are extracted from the numerical results which give explanations about leakage backflows inside the screws and local distortion at the Pump Inlet section.
