... pressure in the stator are performed along with high-speed flow visualizations in the vaneless gap with the help of air bubbles injection. When starting from the best efficiency point (BEP) and increasing the impeller speed, a significant increase of the pressure fluctuations is observed mainly...

...Stephen A. Huyer; Amanda Dropkin This paper presents a computational study to better understand the underlying fluid dynamics associated with various duct shapes and the resultant impact on both total vehicle drag and propulsor efficiency. A post-swirl propulsor configuration (downstream stator...

... openings. A certain number of channels is blocked (rotating stall cell) while the other channels comprise sound flow. Due to a momentum exchange between rotor and stator at the front and the rear cell boundary, the cell is rotating with subsynchronous frequency of about 60 percent of the rotational speed...

...M. Pau; G. Paniagua Ensuring an adequate life of high pressure turbines requires efficient cooling methods such as rim seal flow ejection from the stator-rotor wheel space cavity interface, which prevents hot gas ingress into the rotor disk. The present paper addresses the potential to improve...

...Mihael Sekavčnik; Tine Gantar; Mitja Mori In this paper, we present an experimental and numerical investigation of a single-stage centripetal pump (SSCP). This SSCP is designed to operate in the pump regime, while forcing the working media through impeller-stator flow channels in the radial inward...

...Stephen A. Huyer; Amanda Dropkin; James Dick; David Beal A computational study was performed to investigate a method to generate vehicle maneuvering forces from a propulsor alone. A ducted, preswirl propulsor was configured with an upstream stator row and downstream rotor. During normal operation...

...Jesús Manuel Fernández Oro; Katia María Argüelles Díaz; Carlos Santolaria Morros; Eduardo Blanco Marigorta This paper is conceived as an extension in the analysis of the periodic stator-rotor interaction in a low-speed axial fan with inlet guide vanes. Here, the present work focuses...

...C. G. Rodriguez; E. Egusquiza; I. F. Santos The highest vibration levels in large pump turbines are, in general, originated in the rotor stator interaction (RSI). This vibration has specific characteristics that can be clearly observed in the frequency domain: harmonics of the moving blade passing...

...Sven König; Bernd Stoffel A comprehensive investigation was carried out using two different experimental setups: A 1.5-stage axial turbine and a simplified model, a “spoked-wheel” setup with a rotating wake generator consisting of cylindrical bars. The second stator of the turbine was designed...

... description of the flow across the turbomachine. Using hot-wire anemometry, measurements of axial and tangential velocities were carried out in two transversal sectors: one between the rows and the other downstream of the rotor, covering the whole span of the stage for a complete stator pitch. Ensemble...

...David Megias-Alguacil; Erich J. Windhab The objective of this work is to experimentally study the deformation behavior and breakup process suffered by a droplet submitted to the complex flow developed in a model multitoothed rotor-stator. The studied systems consist of an aqueous solution...

...; experimental uncertainty in f = ± 2.3 % , in S x x = ± 4.1 % A theoretical and experimental investigation was performed for unsteady hydrodynamic force on the impeller due to the rotor-stator interaction in a diffuser pump when the numbers of vanes on the rotor and stator...

...Sébastien Poncet; Roland Schiestel; Marie-Pierre Chauve The present work considers the turbulent flow inside an annular rotor-stator cavity with and without centrifugal throughflow. Extensive measurements performed using a two-component laser-Doppler anemometer technique, and pressure transducers...

... at the rotor–stator interface. This zone is the seat of strong interactions between the moving part and the fixed part. This phenomenon has as consequences: Strongly unsteady flow, fluctuating forces on the stator blades, and an efficiency decrease. This work is part of a project which main objective...

... stators velocity measurement performance evaluation The design of pumps is mainly based on steady flow assumptions in runner, vaneless, and vaned diffusers. This kind of approach is suitable for design operating conditions of classical turbomachinery geometries. However, to understand and take...

...Jerzy Swirydczuk The behavior of turbine stator wakes moving with the flow through a rotor cascade is studied. The stator wake is modeled as a series of active vortices forming part of a von Karman vortex street, the motion of which is determined with the aid of the vortex dynamics theory...

... incorporates important rotor-stator interactions that are neglected in models based on a swept-wake approximation. The model is tested successfully by computing the deterministic stresses in the stator vane passage of a centrifugal pump, and comparing them with direct measurements using PIV data. Remaining...

... to improve the unsteady pressure evaluation by a boundary integration method in the rotor-stator interaction problem. Moreover, for a more realistic prediction of the pressure fluctuations, the inlet flow was supposed to change with time so that pumping system may balance. The calculated time-varying flow...

... ) of a mobile cascade and a stator, which are made with NACA 65 profiles. It is designed for the following operating point (machine N 63 RS): qv = 1060   m 3 / h , Δ p = 150   Pa , N = 2000   rmp 2 Fan N 63 RS This relates to a fan strongly charged, which...

...F. Bakir; S. Kouidri; T. Belamri; R. Rey An algorithm using the singularity method was developed. It allows taking into account the interaction between fixed and mobile cascades. Its principle is based on the summation of discrete vortices distributed periodically on the rotor and stator profiles...