Guide Vane Vibrations Caused by Wakes and Blower Noise—Part 2: Transferability From the Model to the Prototype

Y. N. Chen; G. Baylac; R. Walther

doi:10.1115/1.3439058

Acoustic Vibration in a Stack Induced by Pipe Bends

Journal of Pressure Vessel Technology ◽

10.1115/1.1565080 ◽

2003 ◽

Vol 125 (2) ◽

pp. 228-232 ◽

Cited By ~ 5

Author(s):

F. L. Eisinger ◽

R. E. Sullivan ◽

P. Feenstra ◽

D. S. Weaver

Keyword(s):

Acoustic Wave ◽

Turbulent Flow ◽

Pure Tone ◽

Guide Vane ◽

Acoustic Vibration ◽

Model Tests ◽

Laboratory Scale ◽

Scale Model ◽

Residential Areas ◽

Guide Vanes

Acoustic vibration in two stack liners located inside a stack downstream of two induced draft fans occurred at high loads. Measurements confirmed that an acoustic wave developed in the fundamental diametral mode of the cylindrical stack liners. It manifested itself as a pure tone traveling through the stack to surrounding residential areas. It was suspected that turbulent flow in the pipe bends upstream of the stack and downstream of the fans was the source of the excitation. Laboratory scale model tests confirmed that the bends indeed acted as the source. Two guide vane configurations placed inside the bends were tested experimentally. The tests showed that properly placed guide vanes would reduce the acoustic levels in the stack. The paper gives a description and evaluation of the problem.

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Self-Excited Blade Vibration Experimentally Investigated in Transonic Compressors: Acoustic Resonance

Volume 7B: Structures and Dynamics ◽

10.1115/gt2015-43618 ◽

2015 ◽

Cited By ~ 3

Author(s):

F. Holzinger ◽

F. Wartzek ◽

M. Nestle ◽

H.-P. Schiffer ◽

S. Leichtfuß

Keyword(s):

Rotor Blade ◽

Guide Vane ◽

Separated Flow ◽

Acoustic Resonance ◽

Rotating Stall ◽

Rotor Blades ◽

Inlet Guide Vane ◽

Blade Vibration ◽

Excited Vibration ◽

Experimental Findings

This paper investigates the acoustically induced rotor blade vibration that occurred in a state-of-the-art 1.5-stage transonic research compressor. The compressor was designed with the unconventional goal to encounter self-excited blade vibration within its regular operating domain. Despite the design target to have the rotor blades reach negative aerodamping in the near stall region for high speeds and open inlet guide vane, no vibration occurred in that area prior to the onset of rotating stall. Self-excited vibrations were finally initiated when the compressor was operated at part speed with fully open inlet guide vane along nominal and low operating line. The mechanism of the fluid-structure-interaction behind the self-excited vibration is identified by means of unsteady compressor instrumentation data. Experimental findings point towards an acoustic resonance originating from separated flow in the variable inlet guide vanes. A detailed investigation based on highly resolved wall pressure data confirms this conclusion. The paper documents the spread in aerodynamic damping calculated by various partners with their respective aeroelastic tools for a single geometry and speed line. This significant spread proves the need for calibration of aeroelastic tools to reliably predict blade vibration. The paper contains a concise categorization of flow induced blade vibration and defines criteria to quickly distinguish the different types of blade vibration. It further gives a detailed description of a novel test compressor and thoroughly investigates the encountered rotor blade vibration.

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Self-Excited Blade Vibration Experimentally Investigated in Transonic Compressors: Acoustic Resonance

Journal of Turbomachinery ◽

10.1115/1.4032042 ◽

2015 ◽

Vol 138 (4) ◽

Cited By ~ 10

Author(s):

F. Holzinger ◽

F. Wartzek ◽

H.-P. Schiffer ◽

S. Leichtfuss ◽

M. Nestle

Keyword(s):

Rotor Blade ◽

Guide Vane ◽

Separated Flow ◽

Acoustic Resonance ◽

Rotating Stall ◽

Rotor Blades ◽

Inlet Guide Vane ◽

Blade Vibration ◽

Excited Vibration ◽

Experimental Findings

This paper investigates the acoustically induced rotor blade vibration that occurred in a state-of-the-art 1.5-stage transonic research compressor. The compressor was designed with the unconventional goal to encounter self-excited blade vibration within its regular operating domain. Despite the design target to have the rotor blades reach negative aerodamping in the near stall region for high speeds and open inlet guide vane, no vibration occurred in that area prior to the onset of rotating stall. Self-excited vibrations were finally initiated when the compressor was operated at part speed with fully open inlet guide vane along nominal and low operating line. The mechanism of the fluid–structure interaction behind the self-excited vibration is identified by means of unsteady compressor instrumentation data. Experimental findings point toward an acoustic resonance originating from separated flow in the variable inlet guide vanes (VIGV). A detailed investigation based on highly resolved wall-pressure data confirms this conclusion. This paper documents the spread in aerodynamic damping calculated by various partners with their respective aeroelastic tools for a single geometry and speed line. This significant spread proves the need for calibration of aeroelastic tools to reliably predict blade vibration. This paper contains a concise categorization of flow-induced blade vibration and defines criteria to quickly distinguish the different types of blade vibration. It further gives a detailed description of a novel test compressor and thoroughly investigates the encountered rotor blade vibration.

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Acoustic Vibration in a Stack Induced by Pipe Bends

5th International Symposium on Fluid Structure International, Aeroeslasticity, and Flow Induced Vibration and Noise ◽

10.1115/imece2002-33378 ◽

2002 ◽

Author(s):

F. L. Eisinger ◽

R. E. Sullivan ◽

P. Feenstra ◽

D. S. Weaver

Keyword(s):

Acoustic Wave ◽

Turbulent Flow ◽

Pure Tone ◽

Guide Vane ◽

Acoustic Vibration ◽

Model Tests ◽

Laboratory Scale ◽

Scale Model ◽

Residential Areas ◽

Guide Vanes

Acoustic vibration in two stack liners located inside a stack downstream of two induced draft fans occurred at high loads. Measurements confirmed that an acoustic wave developed in the fundamental diametral mode of the cylindrical stack liners. It manifested itself as a pure tone traveling through the stack to surrounding residential areas. It was suspected that turbulent flow in the pipe bends upstream of the stack and downstream of the fans was the source of the excitation. Laboratory scale model tests confirmed that the bends indeed acted as the source. Two guide vane configurations placed inside the bends were tested experimentally. The tests showed that properly placed guide vanes would reduce the acoustic levels in the stack. The paper gives a description and evaluation of the problem.

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[P118] Phase relationship of Tb0.3Dy0.7Fe2 – Tb0.15Ho0.85Fe2 in the Tb-Dy-Ho-Fe system

Calphad ◽

10.1016/j.calphad.2015.01.205 ◽

2015 ◽

Vol 51 ◽

pp. 410-411

Author(s):

Bowen Wang ◽

Zhizhong Zhao ◽

Yan Lv ◽

Guolu Li ◽

Ling Weng ◽

...

Keyword(s):

Phase Relationship ◽

Relationship Of

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Guidelines for CFD Simulations of Spar VIM

Volume 7: CFD and VIV ◽

10.1115/omae2013-10333 ◽

2013 ◽

Cited By ~ 8

Author(s):

Charles Lefevre ◽

Yiannis Constantinides ◽

Jang Whan Kim ◽

Mike Henneke ◽

Robert Gordon ◽

...

Keyword(s):

Reynolds Number ◽

Test Data ◽

Model Test ◽

Model Tests ◽

Full Scale ◽

Mooring System ◽

Time Step ◽

Cfd Simulations ◽

Scaled Model ◽

Sway Motion

Vortex-Induced Motion (VIM), which occurs as a consequence of exposure to strong current such as Loop Current eddies in the Gulf of Mexico, is one of the critical factors in the design of the mooring and riser systems for deepwater offshore structures such as Spars and multi-column Deep Draft Floaters (DDFs). The VIM response can have a significant impact on the fatigue life of mooring and riser components. In particular, Steel Catenary Risers (SCRs) suspended from the floater can be sensitive to VIM-induced fatigue at their mudline touchdown points. Industry currently relies on scaled model testing to determine VIM for design. However, scaled model tests are limited in their ability to represent VIM for the full scale structure since they are generally not able to represent the full scale Reynolds number and also cannot fully represent waves effects, nonlinear mooring system behavior or sheared and unsteady currents. The use of Computational Fluid Dynamics (CFD) to simulate VIM can more realistically represent the full scale Reynolds number, waves effects, mooring system, and ocean currents than scaled physical model tests. This paper describes a set of VIM CFD simulations for a Spar hard tank with appurtenances and their comparison against a high quality scaled model test. The test data showed considerable sensitivity to heading angle relative to the incident flow as well as to reduced velocity. The simulated VIM-induced sway motion was compared against the model test data for different reduced velocities (Vm) and Spar headings. Agreement between CFD and model test VIM-induced sway motion was within 9% over the full range of Vm and headings. Use of the Improved Delayed Detached Eddy Simulation (IDDES, Shur et al 2008) turbulence model gives the best agreement with the model test measurements. Guidelines are provided for meshing and time step/solver setting selection.

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The Effect of the Thickness and Angle of the Inlet and Outlet Guide Vane on the Performance of Axial-Flow Pump

Volume 1A, Symposia: Turbomachinery Flow Simulation and Optimization; Applications in CFD; Bio-Inspired and Bio-Medical Fluid Mechanics; CFD Verification and Validation; Development and Applications of Immersed Boundary Methods; DNS, LES and Hybrid RANS/LES Methods; Fluid Machinery; Fluid-Structure Interaction and Flow-Induced Noise in Industrial Applications; Flow Applications in Aerospace; Active Fluid Dynamics and Flow Control — Theory, Experiments and Implementation ◽

10.1115/fedsm2016-7939 ◽

2016 ◽

Author(s):

Sang-Won Kim ◽

Youn-Jea Kim

Keyword(s):

Numerical Analysis ◽

Numerical Study ◽

Guide Vane ◽

Axial Flow ◽

Inlet Guide Vane ◽

Guide Vanes ◽

Pump Performance ◽

Blade Thickness ◽

Axial Flow Pump ◽

Flow Pump

An axial-flow pump has a relatively high discharge flow rate and specific speed at a relatively low head and it consists of an inlet guide vane, impeller, and outlet guide vane. The interaction of the flow through the inlet guide vane, impeller, and outlet guide vane of the axial-flow pump has a significant effect on its performance. Of those components, the guide vanes especially can improve the head and efficiency of the pump by transforming the kinetic energy of the rotating flow, which has a tangential velocity component, into pressure energy. Accordingly, the geometric configurations of the guide vanes such as blade thickness and angle are crucial design factors for determining the performance of the axial-flow pump. As the reliability of Computational Fluid Dynamics (CFD) has been elevated together with the advance in computer technology, numerical analysis using CFD has recently become an alternative to empirical experiment due to its high reliability to measure the flow field. Thus, in this study, 1,200mm axial-flow pump having an inlet guide vane and impeller with 4 blades and an outlet guide vane with 6 blades was numerically investigated. Numerical study was conducted using the commercial CFD code, ANSYS CFX ver. 16.1, in order to elucidate the effect of the thickness and angle of the guide vanes on the performance of 1,200mm axial-flow pump. The stage condition, which averages the fluxes between interfaces and is accordingly appropriate for the evaluation of pump performance, was adopted as the interface condition between the guide vanes and the impeller. The rotational periodicity condition was used in order to enable a simplified geometry to be used since the guide vanes feature multiple identical regions. The shear stress transport (SST) k-ω model, predicting the turbulence within the flow in good agreement, was also employed in the CFD calculation. With regard to the numerical simulation results, the characteristics of the pressure distribution were discussed in detail. The pump performance, which will determine how well an axial-flow pump will work in terms of its efficiency and head, was also discussed in detail, leading to the conclusion on the optimal blade thickness and angle for the improvement of the performance. In addition, the total pressure loss coefficient was considered in order to investigate the loss within the flow paths depending on the thickness and angle variations. The results presented in this study may give guidelines to the numerical analysis of the axial-flow pump and the investigation of the performance for further optimal design of the axial-flow pump.

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Hydraulic Characteristics of the New Type Bulb Turbine With Micro-Head

Volume 15: Safety, Reliability and Risk; Virtual Podium (Posters) ◽

10.1115/imece2013-62936 ◽

2013 ◽

Author(s):

Lingyu Li ◽

Yuan Zheng ◽

Daqing Zhou ◽

Zihao Mi

Keyword(s):

Numerical Simulation ◽

Cfd Simulation ◽

Guide Vane ◽

Three Dimensional ◽

Flow Distribution ◽

Three Dimensions ◽

Guide Vanes ◽

Runner Blade ◽

Cfd Method ◽

Bulb Turbine

The head of low-head hydropower stations is generally higher than 2.5m in the world, while micro-head hydropower resources which head is less than 2.5m are also very rich. In the paper, three-dimensional CFD method has been used to simulate flow passage of the micro-head bulb turbine. The design head and unit flow of the turbine was 1m and 3m3/s respectively. With the numerical simulation, the bulb turbine is researched by analyzing external characteristics of the bulb turbine, flow distribution before the runner, pressure distribution of the runner blade surface, and flow distribution of the outlet conduit under three different schemes. The turbine in second scheme was test by manufactured into a physical model. According to the results of numerical simulation and model test, bulb turbine with no guide vane in second scheme has simpler structure, lower cost, and better flow capacity than first scheme, which has traditional multi-guide vanes. Meanwhile, efficiency of second scheme has just little decrease. The results of three dimensions CFD simulation and test results agree well in second scheme, and higher efficiency is up to 77% which has a wider area with the head of 1m. The curved supports in third scheme are combined guide vanes to the fixed supports based on 2nd scheme. By the water circulations flowing along the curved supports which improve energy transformation ability of the runner, the efficiency of the turbine in third scheme is up to 82.6%. Third scheme, which has simpler structure and best performance, is appropriate for the development and utilization of micro-head hydropower resources in plains and oceans.

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Computational fluid dynamic analysis of roof-mounted vertical-axis wind turbine with diffuser shroud, flange, and vanes

Transactions of the Canadian Society for Mechanical Engineering ◽

10.1139/tcsme-2017-0093 ◽

2018 ◽

Vol 42 (4) ◽

pp. 404-415

Author(s):

H. Abu-Thuraia ◽

C. Aygun ◽

M. Paraschivoiu ◽

M.A. Allard

Keyword(s):

Wind Turbine ◽

Urban Areas ◽

Guide Vane ◽

Fluid Dynamic ◽

Vertical Axis ◽

Power Coefficient ◽

Small Scale ◽

Vertical Axis Wind Turbine ◽

Guide Vanes ◽

Turbine Design

Advances in wind power and tidal power have matured considerably to offer clean and sustainable energy alternatives. Nevertheless, distributed small-scale energy production from wind in urban areas has been disappointing because of very low efficiencies of the turbines. A novel wind turbine design — a seven-bladed Savonius vertical-axis wind turbine (VAWT) that is horizontally oriented inside a diffuser shroud and mounted on top of a building — has been shown to overcome the drawback of low efficiency. The objective this study was to analyze the performance of this novel wind turbine design for different wind directions and for different guide vanes placed at the entrance of the diffuser shroud. The flow field over the turbine and guide vanes was analyzed using computational fluid dynamics (CFD) on a 3D grid for multiple tip-speed ratios (TSRs). Four wind directions and three guide-vane angles were analyzed. The wind-direction analysis indicates that the power coefficient decreases to about half when the wind is oriented at 45° to the main axis of the turbine. The analysis of the guide vanes indicates a maximum power coefficient of 0.33 at a vane angle of 55°.

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