Research Papers

An Explanation for Flow Features of Spike-Type Stall Inception in an Axial Compressor Rotor

[+] Author and Article Information
Kazutoyo Yamada

e-mail: k.yamada@mech.kyushu-u.ac.jp

Hiroaki Kikuta, Satoshi Gunjishima

Department of Mechanical Engineering,
Kyushu University,
Fukuoka 819-0395, Japan

Ken-ichiro Iwakiri

Nagasaki Research & Development Center,
Mitsubishi Heavy Industries, Ltd.
Nagasaki 851-0392, Japan

Masato Furukawa

e-mail: furu@mech.kyushu-u.ac.jp

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the Journal of Turbomachinery. Manuscript received July 3, 2012; final manuscript received August 27, 2012; published online November 5, 2012. Editor: David Wisler.

J. Turbomach 135(2), 021023 (Nov 05, 2012) (11 pages) Paper No: TURBO-12-1124; doi: 10.1115/1.4007570 History: Received July 03, 2012; Revised August 27, 2012

The unsteady behavior and three-dimensional flow structure of spike-type stall inception in an axial compressor rotor were investigated by experimental and numerical analyses. Previous studies revealed that the test compressor falls into a mild stall after emergence of a spike, in which multiple stall cells, each consisting of a tornado-like vortex, are rotating. However, the flow mechanism from the spike onset to the mild stall remains unexplained. The purpose of this study is to describe the flow mechanism of a spike stall inception in a compressor. In order to capture the transient phenomena of spike-type stall inception experimentally, an instantaneous casing pressure field measurement technique was developed, in which 30 pressure transducers measure an instantaneous casing pressure distribution inside the passage for one blade pitch at a rate of 25 samplings per blade passing period. This technique was applied to obtain the unsteady and transient pressure fields on the casing wall during the inception process of the spike stall. In addition, the details of the three-dimensional flow structure at the spike stall inception were analyzed by a numerical approach using the detached-eddy simulation (DES). The instantaneous casing pressure field measurement results at the stall inception show that a low-pressure region starts traveling near the leading edge in the circumferential direction just after the spiky wave was detected in the casing wall pressure trace measured near the rotor leading edge. The DES results reveal the vortical flow structure behind the low-pressure region on the casing wall at the stall inception, showing that the low-pressure region is caused by a tornado-like separation vortex resulting from a leading-edge separation near the rotor tip. A leading-edge separation occurs near the tip at the onset of the spike stall and grows to form the tornado-like vortex connecting the blade suction surface and the casing wall. The casing-side leg of the tornado-like vortex generating the low-pressure region circumferentially moves around the leading-edge line. When the vortex grows large enough to interact with the leading edge of the next blade, the leading-edge separation begins to propagate, and then the compressor falls into a stall with decreasing performance.

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Fig. 1

Schematic of test compressor

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Fig. 2

Flow structure at mild stall condition (Inoue et al. [13])

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Fig. 3

Pressure holes on casing wall

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Fig. 4

Temporal interpolation scheme

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Fig. 5

Comparison of casing wall pressure distributions with different interpolation schemes

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Fig. 6

Computational grid

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Fig. 7

Comparison of velocity distributions downstream of rotor and casing wall pressure distribution (left: experiment, right: simulation)

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Fig. 8

Performance characteristics of compressor

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Fig. 9

Variation of flow-rate coefficient with rotor rotation in stalling process of mild stall

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Fig. 10

Casing wall pressure trace near rotor leading edge in stalling process of mild stall (ch.7)

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Fig. 11

Propagation of short length-scale disturbance in stalling process of mild stall

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Fig. 12

Time variation of total pressure rise coefficient (DES)

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Fig. 13

Instantaneous casing pressure field measurement results at spike stall inception (time interval of snapshots: 1/5 of blade passing period)

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Fig. 14

DES results of instantaneous casing pressure field at spike stall inception

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Fig. 15

Unsteady behavior of vortical flow structure, limiting streamlines on blade suction surface (left) and casing wall pressure distribution (right) at spike stall inception

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Fig. 16

Illustration of spike disturbance flow structure

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Fig. 17

Tornadolike separation vortices, tip clearance flows, and limiting streamlines on the blade suction surface of last phase of spike stall inception

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Fig. 18

Flow field around the tip clearance flow spillage (t* = 616)

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Fig. 19

Illustration of tip clearance flow spillage




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