Experimental study on the impulsion port of a trochoidal wheeled pump. (June 2017)

• Record Type: Journal Article
• Authors: Raush, Gustavo; Gamez-Montero, Pedro J.; Castilla, Roberto; Codina, Esteve
• Is Part Of: Flow measurement and instrumentation. Volume 55(2017)
• Page Start: 13
• Page End: 22
• Publication Date: 2017-06
• Subjects: TRPIV -- Gerotor pump -- Flow pulsation -- Cross-spectrum -- Power spectral density -- Spectrogram -- Manufacturing tolerances -- Trochoidal-gear -- Interteeth clearances; Fluid dynamic measurements -- Periodicals; Flow meters -- Periodicals; Fluides, Dynamique des -- Mesure -- Périodiques; Débitmètres -- Périodiques; 681.2805
• DOI: 10.1016/j.flowmeasinst.2016.10.014
• Languages: English
• ISSNs: 0955-5986

Abstract

Abstract: All positive displacement pumps produce a pulsating flow. The present paper reports the experimental measurement of steady flow pulsations in the outlet of the internal wheeled pump. In the measured flow, the manufacturing tolerance are responsible of part of the spectra of the whole pulsation. Time-Resolved Particle Image Velocimetry technique has been used for this purpose. The flow pulsation measurement from a direct visualization of the velocity profile was carried out. The flow rate signal is derived from ad-hoc integration algorithm of the radial velocity profile, where the area discretization is a constant parameter that is relevant to minimize PIV errors by velocity gradients regions near the wall. Spectrographic analysis on the experimental data reveled low frequency components related with manufacturing tolerances. Measurements of this non-invasive procedure are compared with detailed CFD numerical results obtained from an improved gerotor model where manufacturing tolerances have been included. To be compared, cross-power spectral density analysis has been applied. The results reported in the paper show a method to provide a fast non-invasive flow pulsation measurement not only for pumps but also could be extended to compare aging effects of other kind of fluid power devices. Highlights: A Time-Resolved PI V procedure with visualization on the outlet of gerotor propose. An iso-area segmentation of the velocity map allows the flow ripple measurement minimizing gradient errors. Spectrographic analysis shows the influence of manufacturing tolerances in the flow ripple. Cross power spectral density between numerical and experimental results confirm the observations. Spectrogram and cross-power spectral density isolate the harmonics components of flow signal.