Process and apparatus for expanding multi-stage axial flow gas compressor stable operation zone

An axial flow compressor, stable operation technology, applied in mechanical equipment, engine components, machines/engines, etc., can solve catastrophic accidents, reduce unit operating efficiency, affect system stable operation and other problems

Inactive Publication Date: 2003-12-31
江苏中国科学院能源动力研究中心 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, on the one hand, this method reduces the operating efficiency of the unit, and on the other hand, it also affects the stable operation of the system. In severe cases, it will cause the system to surge and cause catastrophic accidents.
From the perspective of the application prospect of the active control technology of rotating stall at present, due to the limitations of the robustness of the control mechanism, the high response of the actuator, and the time-varying nature of the feedback control model, the practical application of this technology on the compressor is hindered.

Method used

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  • Process and apparatus for expanding multi-stage axial flow gas compressor stable operation zone
  • Process and apparatus for expanding multi-stage axial flow gas compressor stable operation zone
  • Process and apparatus for expanding multi-stage axial flow gas compressor stable operation zone

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Embodiment Construction

[0035] In order to describe the present invention more clearly, this embodiment takes a four-stage axial flow compressor as an example.

[0036] like figure 1 , 2 As shown, powered by the motor 20, the four-stage axial flow compressor 5 inhales gas, the gas flowing through the moving blade 6 and the stationary blade 6a is compressed, and the flow and pressure of the gas is controlled by the air outlet regulating valve 7 .

[0037] Four high-frequency response dynamic pressure sensors 8, 9, 10, 11 are used to collect dynamic pressure signals during compressor operation. Installed on the casing at the trailing edge of the stator vane of the last stage; then the signals are respectively sent to a pre-signal amplifier 12 to simulate and amplify the collected dynamic signals, and the gain of the amplifier is selected to be the highest pressure when the compressor is running stably The value is the upper limit, and the upper limit value is selected on the order of 4.5 volts; then ...

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Abstract

The present invention is the method of expanding the stable operation region of multi-stage axial-flow air compressor based on the feedback control principle. During the running of the multi-stage axial-flow air compressor, the dynamic pressure signal is collected, amplified, low-pass filtered and A/D converted and treated in a DSP for the synchronous analysis of varying characteristic of the first order harmonic wave in premonitory flow instability signal. According to the set threshold, premonitory flow instability signal inside the system is collected and control signal is output and transmitted via D/A converter to several mini electromagnetic control valves and one HF pneumatic conveyance controlling valve to control the mini nozzles to jet high pressure airflow altering the non-stationary characteristic of the airflow inside the movable blade channel. The said process can postpone stalling and expand stable operation region.

Description

technical field [0001] The invention relates to a method for widening the stable operation area of ​​a compressor, in particular to a method for widening the stable operation area of ​​a multistage axial flow compressor. The invention also relates to a device for realizing the method of widening the stable operating region of a multi-stage, axial-flow compressor. Background technique [0002] Axial flow compressors are widely used in aero-engines and industrial production. When the multi-stage and axial-flow compressor is close to the stall boundary, the nonlinear coupling mechanism of the flow separation phenomenon of the suction surface boundary layer inside the blade channel and the stability matching of each stage changes. Under the induction of system or local flow instability factors, The phenomenon of rotating stall of the compressor is caused, that is, a stall group appears inside the blade channel, and this type of rotating stall group rotates in reverse on the ord...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D17/08
Inventor 聂超群徐纲陈静宜黄伟光
Owner 江苏中国科学院能源动力研究中心
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