Performance Assessment of an Annular S-Shaped Duct

Bailey, David; Britchford, K. M.; Carrotte, J. F.; Stevens, S. J.

doi:10.1115/95-gt-242

Cited by 14 publications

(29 citation statements)

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“…As it was mentioned earlier, the value of the optimal slope increases with the parameters and so the duct becomes steeper. Optimal meridional duct length can be determined from (5), based on and corresponding OPT found from Figure 12(a). The lower value of parameter and the higher value of inlet swirl angle, the shorter duct length.…”

Section: Simulation Resultsmentioning

confidence: 99%

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A New Approach to Designing the S-Shaped Annular Duct for Industrial Centrifugal Compressor

Yurko

Bondarenko

2014

International Journal of Rotating Machinery

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The authors propose an analytical method for designing the inlet annular duct for an industrial centrifugal compressor using high-order Bezier curves. Using the design of experiments (DOE) theory, the three-level full factorial design was developed for determination of influence of the dimensionless geometric parameters on the output criteria. Numerical research was carried out for determination of pressure loss coefficients and velocity swirl angles using the software system ANSYS CFX. Optimal values of the slope for a wide range of geometric parameters, allowing minimizing losses in the duct, have been found. The study has used modern computational fluid dynamics techniques to develop a generalized technique for future development of efficient variable inlet guide vane systems. Recommendations for design of the s-shaped annular duct for industrial centrifugal compressor have been given.

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Section: Simulation Resultsmentioning

confidence: 99%

“…Bailey et al [5] investigated the aerodynamic performance of a compressor s-shaped duct with a single strut. The data have shown that, as a result of flow curvature, significant streamwise pressure gradients exist within the duct, with this curvature also affecting the generation and suppression of turbulence.…”

Section: Introductionmentioning

confidence: 99%

A New Approach to Designing the S-Shaped Annular Duct for Industrial Centrifugal Compressor

Yurko

Bondarenko

2014

International Journal of Rotating Machinery

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“…As soon as flow approaches to the outer wall of the first bend, its pressure gets higher than the inner wall and consequently across the first bend, a pressure gradient is observed. However, this occurrence is altered within the second bend [3][4][5]. The S-shaped compressor transition duct is referred to as an S-shaped duct in the subsequent sections of the manuscript.…”

Section: Introductionmentioning

confidence: 99%

Design optimization of S-shaped compressor transition duct using particle swarm optimization algorithm

Sharma

Baloni

2020

SN Appl. Sci.

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A high-bypass turbofan engine transfers air from low-to the high-pressure compressor through an S-shaped transition duct. Minimization of the total pressure loss and maximization of uniform flow are key factors to ensure the maximum performance of the S-shaped transition duct. The conventional design approach is time-consuming and does not guarantee an optimal solution. Hence, the present article is based on the application of optimization for the S-shaped compressor transition duct. The optimization is carried out on the basis of shape parameters to minimize objectives namely pressure loss coefficient and non-uniformity with the reduction of length of the S-shaped transition duct. The 2-D axisymmetric approach of computational fluid dynamics is used as a design tool for performance evaluation with optimization techniques. The simulation model is validated with the available experimental results of the literature. The correlation between the response and independent variables is established with the help of the second-order polynomial response surface methodology. Further, individual optimization is carried out for single-objective consideration using particle swarm optimization and gray wolf optimization algorithms. As the results of single-objective optimization depict the conflicts between both objectives, later optimization using multi-objective particle swarm optimization and multi-objective gray wolf optimization algorithms is carried out. The performance metrics are obtained and compared. The 'TOPSIS' method is applied to get best solution out of multiple solutions. The optimized duct reduced pressure loss coefficient and non-uniformity index by 28.14% and 43.33% with a reduction of 6.37% of length compared to baseline S-shaped duct.

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“…Recently, some studies have been reported on S-shaped ducts (Britchford et al, 1994;Bailey et al, 1995;Bailey and Carrotte, 1996). Their long-term objective is to apply CFD methods to enable the optimum design of S-shaped ducts.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Inlet Boundary Layer Thickness on the Flow Within an Annular S-Shaped Duct

Sonoda

Arima

Oana

1998

Volume 1: Turbomachinery

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Experimental and numerical investigations were carried out to gain a better understanding of the flow characteristics within an annular S-shaped duct, including the effect of the inlet boundary layer (IBL) on the flow. A duct with six struts and the same geometry as that used to connect compressor spools on our experimental small two-spool turbofan engine was investigated. A curved downstream annular passage with a similar meridional flow path geometry to that of the centrifugal compressor has been fitted at the exit of S-shaped duct. Two types of the IBL (i.e. thin and thick IBL) were used. Results showed that large differences of flow pattern were observed at the S-Shaped duct exit between two types of the IBL, though the value of “net” total pressure loss has not been remarkably changed. According to “overall” total pressure loss, which includes the IBL loss, the total pressure loss was greatly increased near the hub as compared to that for a thin one. For the thick IBL, a vortex pair related to the hub-side horseshoe vortex and the separated flow found at the strut trailing edge has been clearly captured in the form of the total pressure loss contours and secondary flow vectors, experimentally and numerically. The high-pressure loss regions on either side of the strut wake near the hub may act on a downstream compressor as a large inlet distortion, and strongly affect the downstream compressor performance. There is a much-distorted three-dimensional flow pattern at the exit of S-Shaped duct. This means that the aerodynamic sensitivity of S-Shaped duct to the IBL thickness is very high. Therefore, sufficient carefulness is needed to design not only downstream aerodynamic component (for example centrifugal impeller) but also upstream aerodynamic component (LPC OGV).

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Performance Assessment of an Annular S-Shaped Duct

Cited by 14 publications

References 0 publications

A New Approach to Designing the S-Shaped Annular Duct for Industrial Centrifugal Compressor

A New Approach to Designing the S-Shaped Annular Duct for Industrial Centrifugal Compressor

Design optimization of S-shaped compressor transition duct using particle swarm optimization algorithm

The Effect of Inlet Boundary Layer Thickness on the Flow Within an Annular S-Shaped Duct

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