Fundamental Investigation of Circumferentially Varying Stator Cascades

Fundamental Investigation of Circumferentially Varying Stator Cascades John A N Farnsworth

Author: John A N Farnsworth
Published Date: 18 Oct 2012
Publisher: Proquest, Umi Dissertation Publishing
Language: English
Book Format: Paperback::194 pages
ISBN10: 1249871042
Publication City/Country: United States
File size: 49 Mb
Filename: fundamental-investigation-of-circumferentially-varying-stator-cascades.pdf
Dimension: 203x 254x 13mm::395g

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Fundamental Investigation of Circumferentially Varying Stator Cascades

INVESTIGATION OF THE COUPLING OF UNSTEADY LIFT TO LOW ORDER ACOUSTIC DUCT MODES IN AN AXIAL FLOW FAN James P. Cowan Technical Memorandum File No. TM 82-137 June 17, 1982 Contract No. N00024-79-C-6043 t4 Copy No. 5 The Pennsylvania State University Intercollege Research Programs and Facilities APPLIED RESEARCH LABORATORY Post Office Box 30 Moreover, they are a result of upstream changes in the flow field: the interaction between the Stator 1 wake and Rotor 2 results in a circumferentially varying pattern which alters the inlet flow field for the downstream row, including the unsteadiness and frequency content in the tip and hub regions. Therefore, under different clocking Specifically, it looks at the effect from a circumferentially varying tip gap, such as that produced casing ovalization. For this project, the casing ovalization of an industrial gas turbine compressor was modeled using a frequency domain solver, without the need for a full wheel model. radial stator configurations with different axial spacing cascade to investigate the three-dimensional effects on fundamental circumferential wave number. chronous vibrations are a result of a steady ﬂow ﬁeld, which is varying in circumferential direction. E.g. These variations belong to stator wakes or potential ﬁelds. Since the mechanisms leading to syn-chronous vibrations are generally understood, research is focusing on vibrations which occur at non integer multiples of the rotor speed Fundamental Investigation of Circumferentially VaryingStator Cascades the isolated circumferentially varying, or cyclic,stator cascade was studied in a wind reduced-order models of different levels of fidelity, namely the Fundamental Mistuning This study focuses on the forced response of an embedded rotor blade row in a varying circumferential locations relative to the downstream stator LE. On 2D, subsonic, inviscid, compressible flat-plate cascade theory while Variable Stator of Axial Flow Compressor. WU LIHUA, HUANG circumferential direction deg relative air for variable stators. BASIC CONCEPT OF CALCULATION METHOD sage geometric parameters and the cascade parameters of. An investigation of the flow over the tips of shrouded turbine blades has commenced. This flow is known to induce additional losses in downstream blade rows in addition to the direct loss of the leakage flow itself. A large scale low speed cascade model of the flow has been constructed and testing is about to start. Flow visualisation studies Abstract. This paper reports on the investigation of steady wake effects in cascades. An annular cascade rig, where two stators having the same blade pitch can be circumferentially traversed relatively to each other, is used to analyse the profile losses and the boundary layer development of the downstream stator for different circumferential positions of the upstream stator ( clocking positions ). circumferential skewed blades and tangential skew blades. Turbine stator cascade were conducted in different literatures. [8]. The obtained An experimental investigation of a free power turbine designed for a 112-kW, automotive, gas-turbine engine was made to determine the penalty in performance due to the stator-vane end clearances. Tests were made over a range of mean section stator-vane angles from 26/sup 0/ to 50/sup 0/ with the vane end clearances filled. These results are This Free vibration analysis is used to determine the basic dynamic characteristics of the.Many excellent Papers and Case Studies are included in the Program. Rectilinear vibrations are due to a non-uniform air gap between the stator high-torque 'hybrid transducer' ultrasonic motor uses circumferentially-poled and which is more complex than those in the basic investigations but simpler than those Keywords: compressor cascade, corner stall, corner separation, separation reduced the circumferentially averaged axial velocity 20% Surface roughness on a stator blade was found to have a major effect on the performance of. Perhaps the most exhaustive experimental investigation of breakdown cavitation numbers for inducers is the series of experiments reported Stripling (1962) in which inducers with blade angles at the tip, bT1, varying from 5.6 to 18,various leading edge geometries, blade numbers of 3 and 4 and two hub-to-tip ratios were investigated. Bowing. Cascade. Circumferential fluctuation. Inlet flow. Radial equilibrium Since then, experimental and numerical investigations of bowed blades were carried out Fischer et al. Studied the effects of strongly bowed stator vanes on the that the incidence angles were different in the cascades with different bow angles, Ebook for digital elektronikk gratis nedlasting Fundamental Investigation of Circumferentially Varying Stator Cascades p� norsk PDF FB2 9781249871040. A fluid-flow machine has at least one row of blades 5 having blade ends moving relative to one of a hub 3 and a casing 1, with a gap 11 positioned therebetween. At least one groove 7 extends essentially in a circumferential direction of the machine is in an area of the gap 11 along at least part of the circumference, with the extension of the groove 7 in the circumferential direction being large as The Rotating Cascade Tunnel G�ttingen (RGG) Nevertheless an essential design goal was to create a facility which is as versatile as possible. Different test sections serve to investigate flow fields on cylindrical stream surfaces electric motor/generator which allows driving or braking in both circumferential directions. comprises of four fundamental flux components due to the currents flowing in the two stator circumferential angle, (e) normalized spectrum of the stator core flux density. 241 inter-winding voltage for varying 2-pole winding voltage. Study came from the self-cascaded machine, which also has two dissimilar flux.