Investigation on Secondary Flow Characteristics in a Curved Annular Duct with Struts

Bu, Huanxian; Tan, Huijun; Wei, Xiaohui; He, Xiaomin

doi:10.1007/s10494-015-9674-5

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…-Pressure loss was highly sensitive to the inner wall rather than the outer wall. Bu et al [40] Eight struts (Four thick and four thin) Twenty sex struts -The separation bubbles were found in both cases (with struts and without struts), however, strutted duct had a large size of bubbles. -Due to the larger size of bubbles, pressure loss was high in the strutted duct.…”

Section: Number Of Struts Remarkmentioning

confidence: 97%

Review on the aerodynamics of intermediate compressor duct

Sharma¹,

Baloni²

2020

JMES

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In a turbofan engine, the air is brought from the low to the high-pressure compressor through an intermediate compressor duct. Weight and design space limitations impel to its design as an S-shaped. Despite it, the intermediate duct has to guide the flow carefully to the high-pressure compressor without disturbances and flow separations hence, flow analysis within the duct has been attractive to the researchers ever since its inception. Consequently, a number of researchers and experimentalists from the aerospace industry could not keep themselves away from this research. Further demand for increasing by-pass ratio will change the shape and weight of the duct that uplift encourages them to continue research in this field. Innumerable studies related to S-shaped duct have proven that its performance depends on many factors like curvature, upstream compressor’s vortices, swirl, insertion of struts, geometrical aspects, Mach number and many more. The application of flow control devices, wall shape optimization techniques, and integrated concepts lead a better system performance and shorten the duct length. This review paper is an endeavor to encapsulate all the above aspects and finally, it can be concluded that the intermediate duct is a key component to keep the overall weight and specific fuel consumption low. The shape and curvature of the duct significantly affect the pressure distortion. The wall static pressure distribution along the inner wall significantly higher than that of the outer wall. Duct pressure loss enhances with the aggressive design of duct, incursion of struts, thick inlet boundary layer and higher swirl at the inlet. Thus, one should focus on research areas for better aerodynamic effects of the above parameters which give duct design with optimum pressure loss and non-uniformity within the duct.

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Section: Number Of Struts Remarkmentioning

confidence: 97%

Review on the aerodynamics of intermediate compressor duct

Sharma¹,

Baloni²

2020

JMES

View full text Add to dashboard Cite

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“…Kim et al (2011) showed that the fluid flow has not significantly influenced by the variation of Reynold number with the development of friction factor through the helical pipes. Bu et al (2015) elucidated the variational characteristics of streamlines in the secondary flow through the curved annular ducts. Chen et al (2020) examined the temperature distribution at different inlets in the presence of Joule-Thomson parameters through the helically coiled tubes.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Energy Distribution in Steady and Unsteady Flow Instabilities through a Bend Square Pipe

et al. 2021

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Fluid flow analysis through a bend pipe is extensively conducted in practical and cell separation operations. It is observed that flow behaviors in the bend pipe are influenced by some parameters such as curvature, aspect ratio, etc. As a result, various phenomena, steady solution branches, unsteady solutions, energy transfer are changed. In this paper, the acts of flows are performed together for fixed curvature, δ = 0.2, and Prandtl number, Pr = 7.0 (water). Here, for a wide variety of Dean numbers (100 ≤ Dn ≤ 1000) and three fixed Grashof numbers, Gr = 100, 500, and 1000; time-independent solutions with linear stabilities are investigated first where only the first steady branch exhibits linear stability out of two steady solution branches obtained. Then, different flow transitions between the required range of Dean numbers (Dn) and several Grashof numbers (Gr) are investigated using time-dependent solutions. Power spectrum density (PSD) is further revealed in order to gain a deeper understanding of periodic and multi-periodic flows. Flow velocity contours including axial flow (AF) and secondary flow (SF) and their temperature profiles (TP) are also exposed. The SFs reveal that two- to four-vortex flows are produced due to the turning of steady branch and the flow instabilities. Furthermore, the energy transfer between the cooled and heated sidewalls of the pipe is calculated. Finally, a link between centrifugal and body force with the energy transfer has been shown in this research which reveals that the fluid has merged that certainly rises the overall energy transfer.

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Flow Development Through An S-Shaped Diffusing Duct

Teng

Feng

et al. 2020

International Journal of Turbo &Amp; Jet-Engines

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This paper focuses on the internal flow development of an S-shaped diffusing duct. Based on the experimental result of total pressure recovery coefficient, the Reynolds stress model (RSM) was selected as a suitable turbulence model for the present study. The numerical results show that 6.2 times the area ratio of the exit to inlet and the aggressive deflection at the first bend of the lower wall lead to strong adverse pressure gradient and very large flow separation, and create a pair of counter-rotating vortices along streamwise direction. The duct diffuser efficiency is 72.37 %. The area-averaged total pressure recovery coefficient at the exit of the duct is 0.9814, and the synthesis distortion index DC (60) is 0.7081.

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Investigation on Secondary Flow Characteristics in a Curved Annular Duct with Struts

Cited by 3 publications

References 24 publications

Review on the aerodynamics of intermediate compressor duct

Review on the aerodynamics of intermediate compressor duct

Investigation on Energy Distribution in Steady and Unsteady Flow Instabilities through a Bend Square Pipe

Flow Development Through An S-Shaped Diffusing Duct

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