Three-Dimensional Analysis of Potential Flow in a Centrifugal Impeller by Panel Method

1986 ◽  
pp. 771-781
Author(s):  
Y. Miyake ◽  
K. Bando ◽  
Y. Masuda ◽  
S. Nagamatsu
Keyword(s):  
Dimensional Analysis ◽  
Potential Flow ◽  
Three Dimensional ◽  
Panel Method ◽  
Centrifugal Impeller

scholarly journals Three-dimensional analysis of potential flow in a centrifugal impeller by panel method.

1986 ◽  
Vol 52 (484) ◽  
pp. 3993-4000
Author(s):  
Yutaka MIYAKE ◽  
Kiyoshi BANDOH ◽  
Yoshio MASUDA ◽  
Shigetaka NAGAMATSU
Keyword(s):  
Dimensional Analysis ◽  
Potential Flow ◽  
Three Dimensional ◽  
Panel Method ◽  
Centrifugal Impeller

scholarly journals Design and Testing of Swept and Leaned Outlet Guide Vanes to Reduce Stator-Strut-Splitter Aerodynamic Flow Interactions

1998 ◽  
Author(s):  
A. R. Wadia ◽  
P. N. Szucs ◽  
K. L. Gundy-Burlet
Keyword(s):  
Dimensional Analysis ◽  
Test Performance ◽  
Potential Flow ◽  
Flow Analysis ◽  
Three Dimensional ◽  
Angle Distribution ◽  
Two Dimensional ◽  
Guide Vanes ◽  
Flow Interactions ◽  
Design And Testing

Large circumferential varying pressure levels produced by aerodynamic flow interactions between downstream stators and struts present a potential noise and stability margin liability in a compression component. These interactions are presently controlled by tailoring the camber and/or stagger angles of vanes neighboring the fan frame struts. This paper reports on the design and testing of a unique set of swept and leaned fan outlet guide vanes (OGVs) that do not require this local tailoring even though the OGVs are closely coupled with the fan frame struts and splitter to reduce engine length. The swept and leaned OGVs not only reduce core-duct diffusion, but they also reduce the potential flow interaction between the stator and the strut relative to that produced by conventional radial OGVs. First, the design of the outlet guide vanes using a single bladerow three-dimensional viscous flow analysis is outlined. Next, a two-dimensional potential flow analysis was used for the coupled OGV-frame system to obtain a circumferentially non-uniform stator stagger angle distribution to further reduce the upstream static pressure disturbance. Recognizing the limitations of the two-dimensional potential flow analysis for this highly three-dimensional set of leaned OGVs, as a final evaluation of the OGV-strut system design, a full three-dimensional viscous analysis of a periodic circumferential sector of the OGVs, including the fan frame struts and splitter, was performed. The computer model was derived from a NASA-developed code used in simulating the flow field for external aerodynamic applications with complex geometries. The three-dimensional coupled OGV-frame analysis included the uniformly-staggered OGVs configuration and the variably-staggered OGVs configuration determined by the two-dimensional potential flow analysis. Contrary to the two-dimensional calculations, the three-dimensional analysis revealed significant flow problems with the variably-staggered OGVs configuration and showed less upstream flow non-uniformity with the uniformly-staggered OGVs configuration. The flow redistribution in both the radial and tangential directions, captured fully only in the three-dimensional analysis, was identified as the prime contributor to the lower flow non-uniformity with the uniformly-staggered OGVs configuration. The coupled three-dimensional analysis was also used to validate the design at off-design conditions. Engine test performance and stability measurements with both uniformly- and variably-staggered OGVs configurations with and without the presence of inlet distortion confirmed the conclusions from the three-dimensional analysis.

Seakeeping and Added Resistance of IACC Yachts by a Three-Dimensional Panel Method

1993 ◽  
Author(s):  
P. D. Sclavounos ◽  
D. E. Nakos
Keyword(s):  
Sensitivity Analysis ◽  
Potential Flow ◽  
Three Dimensional ◽  
Panel Method ◽  
Radius Of Gyration ◽  
Experimental Measurements ◽  
Shape Parameters ◽  
Added Resistance ◽  
Pitch Motion ◽  
America’S Cup

A three-dimensional panel method developed for the prediction of the seakeeping properties of conventional ships has been extended to predict the motions and added resistance of IACC Yachts. The method solves the three dimensional unsteady potential flow around the yacht in monochromatic oblique waves. Predicted quantities include the heave and pitch motion amplitudes and phases and added resistance over a broad range of wave frequencies yacht speeds. Computations have been carried out for a series of IACC hull shapes studied by PACT (Partnership for America's Cup Technology) and correlations with experimental measurements are found to be very satisfactory. The same method was also used to study the added-resistance properties of hull shapes supplied by the America3 Foundation. A sensitivity analysis was carried out of the added resistance on the principal yacht hull shape parameters, including the slenderness, displacement, LCB­LCF separation and pitch radius of gyration.

Design and Testing of Swept and Leaned Outlet Guide Vanes to Reduce Stator–Strut–Splitter Aerodynamic Flow Interactions

1999 ◽  
Vol 121 (3) ◽  
pp. 416-427 ◽  
Author(s):  
A. R. Wadia ◽  
P. N. Szucs ◽  
K. L. Gundy-Burlet
Keyword(s):  
Dimensional Analysis ◽  
Potential Flow ◽  
Flow Analysis ◽  
Three Dimensional ◽  
Angle Distribution ◽  
Two Dimensional ◽  
Guide Vanes ◽  
Flow Interactions ◽  
Design And Testing ◽  
Flow Nonuniformity

Large circumferentially varying pressure levels produced by aerodynamic flow interactions between downstream stators and struts present a potential noise and stability margin liability in a compression component. These interactions are presently controlled by tailoring the camber and/or stagger angles of vanes neighboring the fan frame struts. This paper reports on the design and testing of a unique set of swept and leaned fan outlet guide vanes (OGVs) that do not require this local tailoring even though the OGVs are closely coupled with the fan frame struts and splitter to reduce engine length. The swept and leaned OGVs not only reduce core-duct diffusion, but they also reduce the potential flow interaction between the stator and the strut relative to that produced by conventional radial OGVs. First, the design of the outlet guide vanes using a single blade row three-dimensional viscous flow analysis is outlined. Next, a two-dimensional potential flow analysis was used for the coupled OGV–frame system to obtain a circumferentially nonuniform stator stagger angle distribution to reduce the upstream static pressure disturbance further. Recognizing the limitations of the two-dimensional potential flow analysis for this highly three-dimensional set of leaned OGVs, as a final evaluation of the OGV–strut system design, a full three-dimensional viscous analysis of a periodic circumferential sector of the OGVs, including the fan frame struts and splitter, was performed. The computer model was derived from a NASA-developed code used in simulating the flow field for external aerodynamic applications with complex geometries. The three-dimensional coupled OGV–frame analysis included the uniformly staggered OGV configuration and the variably staggered OGV configuration determined by the two-dimensional potential flow analysis. Contrary to the two-dimensional calculations, the three-dimensional analysis revealed significant flow problems with the variably staggered OGV configuration and showed less upstream flow nonuniformity with the uniformly staggered OGV configuration. The flow redistribution in both the radial and tangential directions, captured fully only in the three-dimensional analysis, was identified as the prime contributor to the lower flow nonuniformity with the uniformly staggered OGV configuration. The coupled three-dimensional analysis was also used to validate the design at off-design conditions. Engine test performance and stability measurements with both uniformly and variably staggered OGV configurations with and without the presence of inlet distortion confirmed the conclusions from the three-dimensional analysis.

Three Dimensional Inviscid Computation of an Impeller Flow

1983 ◽  
Author(s):  
T. C. Prince ◽  
A. C. Bryans
Keyword(s):  
Finite Element ◽  
Potential Flow ◽  
Three Dimensional ◽  
Method Comparison ◽  
Centrifugal Impeller ◽  
Published Data ◽  
Flow Method ◽  
Streamline Curvature ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

The flow in a centrifugal impeller is analyzed by a quasi-three-dimensional streamline curvature method, by a three-dimensional Euler code, and by a three-dimensional finite element potential flow method. Comparison with Eckardt’s published data for a backswept impeller shows that full three-dimensional methods better predict the loading at the hub and shroud.

Effect of rotor aspect ratio and solidity on a straight-bladed vertical axis wind turbine in three-dimensional analysis by the panel method

Energy ◽  
2017 ◽  
Vol 121 ◽  
pp. 1-9 ◽  
Author(s):  
Qing'an Li ◽  
Takao Maeda ◽  
Yasunari Kamada ◽  
Kento Shimizu ◽  
Tatsuhiko Ogasawara ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Wind Turbine ◽  
Dimensional Analysis ◽  
Three Dimensional ◽  
Vertical Axis ◽  
Panel Method ◽  
Vertical Axis Wind Turbine

Three-Dimensional Inviscid Computation of an Impeller Flow

1984 ◽  
Vol 106 (2) ◽  
pp. 523-528 ◽  
Author(s):  
T. C. Prince ◽  
A. C. Bryans
Keyword(s):  
Finite Element ◽  
Potential Flow ◽  
Three Dimensional ◽  
Method Comparison ◽  
Centrifugal Impeller ◽  
Published Data ◽  
Flow Method ◽  
Streamline Curvature ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

The flow in a centrifugal impeller is analyzed by a quasi-three-dimensional streamline curvature method, by a three-dimensional Euler code, and by a three-dimensional finite element potential flow method. Comparison with Eckardt’s published data for a backswept impeller shows that full three-dimensional methods better predict the loading at the hub and shroud.

Experimental Study on Flow in a Supersonic Centrifugal Impeller

1979 ◽  
Vol 101 (1) ◽  
pp. 32-39 ◽  
Author(s):  
Y. Senoo ◽  
H. Hayami ◽  
Y. Kinoshita ◽  
H. Yamasaki
Keyword(s):  
Experimental Data ◽  
Shock Wave ◽  
Dimensional Analysis ◽  
Relative Velocity ◽  
Flow Behavior ◽  
Three Dimensional ◽  
Critical Conditions ◽  
Centrifugal Impeller ◽  
One Dimensional ◽  
Detached Shock Wave

An impeller of a supersonic centrifugal compressor was tested in a casing without a diffuser so that the flow range was not limited by the diffuser. Regarding the impeller, emphasis was placed on critical conditions such as inducer stall and surge. Experimental data were examined based on a one-dimensional analysis and a quasi-three-dimensional analysis. Furthermore, the variation of shroud pressure with respect to time at many locations was utilized to guess the details of flow behavior between impeller blades near the shroud, and the contour of isobars was compared with that predicted by a quasi-three-dimensional analysis. When the inlet relative velocity was supersonic, a detached shock wave and a shock wave in a blade channel were recognized, but the compressor operated efficiently, although such condition existed only in a narrow flow range limited by surge and choke.

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