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Self-air-entraining jet mechanism for axial fan/compressor

An axial flow fan and compressor technology, applied in the direction of machine/engine, jet propulsion device, etc., to achieve the effect of reducing power consumption, reducing flow loss, and reducing floor space

Active Publication Date: 2013-01-02
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This shows that the steady discrete jet can still achieve a good stability expansion effect by using the same level of jet volume as the active jet, but Suder’s understanding of this effect is still limited to the effect of the jet on the steady-state flow field

Method used

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  • Self-air-entraining jet mechanism for axial fan/compressor
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  • Self-air-entraining jet mechanism for axial fan/compressor

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Embodiment Construction

[0031] Under the premise of not considering the pipeline loss, from Figure 1a The shaft work of the compressor can be obtained from the external bleed air in:

[0032] Wc=m 1 c p (T 02 -T 01 )+m 3 c p (T 02 -T 03 ) (1)

[0033] The power consumption of external bleed air is:

[0034] Wp=m 3 c p (T 03 -T 01 ) (2)

[0035] The total power consumption is thus:

[0036] W=m 1 c p (T 02 -T 01 )+m 3 c p (T 02 -T 01 ) (3)

[0037] See Figure 1b , for self-entrained gas:

[0038]

[0039] therefore

[0040] Where Wc is the shaft work of the compressor, m 1 is the mass flow rate at the inlet of the compressor, m 2 is the mass flow rate at the inlet of the compressor, m 3 is the mass flow rate of bleed air, c p is specific heat capacity at constant pressure, T 01 is the mainstream inlet temperature of the compressor, T 02 is the main flow outlet temperature of the compressor, T 03 is the tempera...

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Abstract

The invention discloses a self-air-entraining jet mechanism for an axial fan / compressor, and relates to the technology of combustion turbines. According to the self-air-entraining jet mechanism for the axial fan / compressor, diffusion deceleration is achieved by adopting an increasing pipe as an outlet at the rear stage of the axial fan / compressor, and the flow loss is reduced; and the air inlet nozzle end adopts a Laval nozzle to achieve the purposes of acceleration and decompression, so that the momentum of the outlet of the air inlet nozzle is maximized and the purpose of improving the stability margin is achieved to the largest extent. When the self-air-entraining jet mechanism for the axial fan / compressor is in operation, gas at the rear stage is guided into the top area of a movable vane at the front stage to be jetted, so that the purposes of improving the stall speed and increasing the stability margin are achieved, and therefore the axial fan / compressor can run under the working conditions of higher pressure ratio and wide stall margin.

Description

technical field [0001] The invention relates to the technical field of gas turbines, and is a novel axial flow fan / compressor self-induced air injection mechanism. Background technique [0002] Stability is an important characteristic for any fan / compressor. High-performance engines require the axial fan / compressor to work under high-pressure ratio, high-efficiency conditions and wide stall margin, so for the compression system itself, there is a certain match between high-pressure ratio, high efficiency and wide stall margin question. Therefore, in the past few decades, domestic and foreign scholars have developed active control and passive control technologies to suppress the instability and delay the occurrence of stall through the detection of fan / compressor instability. [0003] Jet technology has also been extensively researched as an effective method of stability expansion. In 1993, Day of Cambridge University used active jet technology to conduct experimental rese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02K1/30
Inventor 李继超童志庭林峰聂超群
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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