Numerical investigation of inlet boundary layer skew in axial-flow compressor cascade and the corresponding non-axisymmetric end wall profiling

Li, Xiangjun; Chu, Wuli; Wu, Yuanhao

doi:10.1177/0957650914532264

Cited by 31 publications

(33 citation statements)

References 16 publications

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“…The corner separation induces a large amount of flow blockage and loss; also, it is harmful to the performance of fluid machinery. [3][4][5][6] For example, it is widely known the corner separation inside the compressor may trigger the corner stall and reduce the stable range of aero-engine. A way to avoid the corner separation is to carefully design the shape of the junction and this heavily relies on the knowledge about the flow physics inside the corner region.…”

Section: Introductionmentioning

confidence: 99%

Improved compressor corner separation prediction using the quadratic constitutive relation

Chen

Yuan

2017

Proceedings of the Institution of Mechanical Engineers, Part A:

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This work presents the implementation and study of the quadratic constitutive relation nonlinear eddy-viscosity model with representative compressor application, for which the corner separation has been poorly predicted with the widely used linear Boussinesq eddy-viscosity model. With the introduction of the Reynolds stress anisotropy, the secondary flow of the second kind and its effect on the corner flow can be well captured and this results in greatly improved prediction of pressure coefficient, total pressure loss coefficient and the corner separation size. Without the quadratic constitutive relation model, the separation size and loss are generally over-estimated. The mechanism of the improvement is studied using both the vortex dynamics and the momentum equation. It is proved that quadratic constitutive relation model consumes low CPU time and provides much improved compressor corner separation prediction without worsening the convergence property.

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Section: Introductionmentioning

confidence: 99%

Improved compressor corner separation prediction using the quadratic constitutive relation

Chen

Yuan

2017

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…It was known that the cascade performance is actually an abstract function of profiling parameters, i.e. 13 14 17…”

Section: Resultsmentioning

confidence: 99%

“…The numbers of nodes in some important sections are also indicated in Fig.2. The above mentioned details of the numerical model are the same as those reported in previous work [13] , in which the grid development was validated by experimental measurements after going through a grid convergence study. In this paper, the grid distribution is changed only on the span-wise direction.…”

Section: Compressor Cascade In Studymentioning

confidence: 99%

“…(6) in which the subscript 'in' , 'out' and 'mavg' respectively represents inlet plane, outlet plane and the mass flow averaged value. Evaluation for loss sources is by a quantitative analysis model derived in our previous work [13] . According to the model, the blade passage can be divided into four sub-regions upon the mechanism of loss generation, as shown in Fig.7.…”

Section:  mentioning

confidence: 99%

“…This can be seen in Lepot's investigation [12] , where the end wall was profiled together with the blade and obtained a combined PEW which agreed with the upslope rule in the front part of the passage while appearing contrary to it in the rest region. In Li's [13] research, the optimized PEW was found to slow down cross-passage flow in the mid-pitch region, accelerate it when approaching the SS and then slow it down again in the region of the SS corner. A recent study of Mahesh [14] conducted an optimization profiling employing 130 control points on the hub end wall surface.…”

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confidence: 99%

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Effective end wall profiling rules for a highly loaded compressor cascade

Chu

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part A:

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This paper presents a numerical study of a linear compressor cascade to investigate the effective end wall profiling rules for highly-loaded axial compressors. The first step in the research applies a correlation analysis for the different flow field parameters by a data mining over 600 profiling samples to quantify how variations of loss, secondary flow and passage vortex interact with each other under the influence of a profiled end wall. The result identifies the dominant role of corner separation for control of total pressure loss, providing a principle that only in the flow field with serious corner separation does the does the profiled end wall change total pressure loss, secondary flow and passage vortex in the same direction. Then in the second step, a multi-objective optimization of a profiled end wall is performed to reduce loss at design point and near stall point. The development of effective end wall profiling rules is based on the manner of secondary flow control rather than the geometry features of the end wall. Using the optimum end wall cases from the Pareto front, a quantitative tool for analyzing secondary flow control is employed. The driving force induced by a profiled end wall on different regions of end wall flow are subjected to a detailed analysis and identified for their positive/negative influences in relieving corner separation, from which the effective profiling rules are further confirmed. It is found that the profiling rules on a cascade show distinct differences at design point and near stall point, thus loss control of different operating points is generally independent.

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Numerical investigation of centrifugal compressor stability enhancement using vaned diffuser endwall contouring technology

Cui

Qin

Jia

et al. 2022

Energy Science & Engineering

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To improve the stable operating range of centrifugal compressor stage, endwall contouring technology is introduced on the hub-side wall of the vaned diffuser for NASA CC3 centrifugal compressor as a promising technique to redistribute the flow field near the endwall in this paper. The main contents of this paper are listed as follows. First, a specific parameterized endwall contouring guideline is developed based on sinusoidal function and Bézier curve, and three factors are considered, namely, peak height, peak radial position, and frequency coefficient. Then, centrifugal compressor stages with baseline diffuser and contoured endwall diffusers are numerically investigated to reveal the influence of endwall contouring on the stable operating range. Results show that endwall contouring is an effective method to achieve stability enhancement with no evident reduction in stage performance on the design point. CEW13-12 has the most successful combination of endwall contouring parameters, and stall margin is increased by up to 40% for CEW13-12. Finally, the influence mechanism of endwall contouring on the stable operating range is discussed. At the near stall condition, the contouring endwall forces the fluid within the semi vaneless space to deflect toward the suction side to increase the momentum of low-energy fluid in the suction surface boundary layer and reduce the adverse pressure gradient on the suction side, which delay the development of flow separation on the vane leading edge near the shroud side to suppress the onset of rotating stall. At the near choke condition, the contouring endwall has more potential to increase the throat area, resulting in a decrease of throat blockage to improve choke margin. The results show that the endwall contouring technology is a reliable method to achieve stability enhancement of centrifugal compressor stage.

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Numerical investigation of inlet boundary layer skew in axial-flow compressor cascade and the corresponding non-axisymmetric end wall profiling

Cited by 31 publications

References 16 publications

Improved compressor corner separation prediction using the quadratic constitutive relation

Improved compressor corner separation prediction using the quadratic constitutive relation

Effective end wall profiling rules for a highly loaded compressor cascade

Numerical investigation of centrifugal compressor stability enhancement using vaned diffuser endwall contouring technology

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