Research Papers

Self-Adaptive Stability-Enhancing Technology With Tip Air Injection in an Axial Flow Compressor

[+] Author and Article Information
Jichao Li

Institute of Engineering Thermophysics,
Chinese Academy of Sciences,
Beijing 100190, China
e-mail: lijichao@iet.cn

Manuscript received January 14, 2016; final manuscript received August 22, 2016; published online September 20, 2016. Assoc. Editor: Nicole L. Key.

J. Turbomach 139(1), 011008 (Sep 20, 2016) (9 pages) Paper No: TURBO-16-1012; doi: 10.1115/1.4034553 History: Received January 14, 2016; Revised August 22, 2016

Self-adaptive stability control with discrete tip air injection and online detection of prestall inception is experimentally studied in a low-speed axial flow compressor. The control strategy is to sense the cross-correlation coefficient of the wall static pressure patterns and to feed back the signal to an annular array of eight separately proportional injecting valves. The real-time detecting algorithm based on cross-correlation theory is proposed and experimentally conducted using the axisymmetric arrangement of time-resolved sensors. Subsequently, the sensitivity of the cross-correlation coefficient to the discrete tip air injection is investigated. Thus, the control law is formed on the basis of the cross-correlation as a function of the injected momentum ratios. The steady injection and the on–off pulsating injection are simultaneously selected for comparison. Results show that the proposed self-adaptive stability control using digital signal processing (DSP) controller can save energy when the compressor is stable. This control also provides protection when needed. With nearly the same stall margin improvement (SMI) as the steady injection (maximum SMI is 44.2%), the energy of the injected air is roughly a quarter of the steady injection. Unlike the on–off pulsating jet, the new actuating scheme can reduce the unsteady force impinging onto the compressor blades caused by the pulsating jets in addition to achieve the much larger stability range extension.

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Fig. 1

Arrangement of the sensor and measurements

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Fig. 2

Sketch map of the injected system and the structure of the injector

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Fig. 3

RMSP contours with different flow coefficients without tip air injection (a) Φ=0.55, (b) Φ=0.50, (c) Φ=0.47, (d) characteristic line

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Fig. 4

Comparison of the oscillating pressure

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Fig. 5

Cross-correlation coefficient distribution

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Fig. 6

Statistical probability distribution

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Fig. 7

Probability distribution function of the cross-correlation coefficient at the near stall point without injection with different injected momentum ratios

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Fig. 8

RMSP with tip air injection at the near stall point with no injection

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Fig. 9

SMI as a function of injected momentum ratio

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Fig. 11

Block diagram of the control system

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Fig. 12

Change of the cross-correlation coefficient

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Fig. 14

Consumption of the injected mass flow ratio

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Fig. 13

Characteristic line with different types of tip air injection



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