CN112664326A

CN112664326A - High-low pressure bleed air system

Info

Publication number: CN112664326A
Application number: CN202011444857.4A
Authority: CN
Inventors: 贺鹏程; 黄彦; 潘金涛; 陶伟海; 孟繁鑫
Original assignee: Jincheng Nanjing Electromechanical Hydraulic Pressure Engineering Research Center Aviation Industry Corp of China
Current assignee: Jincheng Nanjing Electromechanical Hydraulic Pressure Engineering Research Center Aviation Industry Corp of China
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2021-04-16
Anticipated expiration: 2040-12-11
Also published as: CN112664326B

Abstract

The invention is suitable for the field of energy transmission, and particularly relates to a high-low pressure air entraining system with strong stability and low noise. The mixing of the fluids due to the high and low pressures causes severe fluctuations in temperature and pressure, which also increases the volume of the bleed air system. The system comprises a high-pressure pipeline consisting of a high-pressure stage and a high-pressure stage valve which are led out from a high-pressure area of an engine, and a low-pressure pipeline consisting of a low-pressure stage and a low-pressure stage valve which are led out from a low-pressure area of the engine, wherein the high-pressure pipeline and the low-pressure pipeline discharge mixed gas after passing through a mixing valve. The pressure drop conflict after the high-pressure and low-pressure mixing is reduced, the control is simpler, other fluid mixing stability schemes can be applied, and the uniform mixing of the fluid is facilitated.

Description

High-low pressure bleed air system

Technical Field

The invention is suitable for the field of energy transmission, and particularly relates to a high-low pressure air entraining system with strong stability and low noise.

Background

High and low pressure bleed air is an important air source introduction means for the environmental control system, as shown in fig. 1, and causes severe fluctuations in temperature and pressure due to fluid mixing caused by high and low pressures, while also increasing the volume of the bleed air system, as shown in fig. 2, which is applied by Hamilton Sundstrand Corporation for a Stepped high-pressure controlled system us2018/0073431a1, which is pressure regulated by way of multi-stage depressurization through a plurality of valves.

Disclosure of Invention

The invention designs a high-low pressure bleed air system innovatively, and automatically adjusts the bleed air pressure of mixed output on the basis of not increasing the complexity of the system obviously.

The invention relates to a high-low pressure air-entraining system, which comprises a high-pressure pipeline consisting of a high-pressure stage and a high-pressure stage valve which are led out from a high-pressure area of an engine, and a low-pressure pipeline consisting of a low-pressure stage and a low-pressure stage valve which are led out from a low-pressure area of the engine, wherein the high-pressure pipeline and the low-pressure pipeline discharge mixed gas after passing through a mixing valve.

Advantageously, the system further comprises a secondary ejector on the high-pressure pipeline, the secondary nozzle of the secondary ejector is communicated with the high-pressure stage valve, the secondary ejector port is communicated with the diffuser outlet of the primary ejector, and the secondary diffuser outlet is communicated with the inlet of the primary nozzle.

Advantageously, the mixed gas is introduced into the gas using end.

Advantageously, the air end comprises a cockpit, an electronic device or a wing.

Advantageously, the high pressure stage and the low pressure stage are respectively joints leading from a high pressure stage compressor and a low pressure stage compressor of the engine.

Advantageously, the high-pressure stage and high-pressure stage valves are made of high-temperature and high-pressure resistant materials.

Advantageously, the high pressure stage valve is throttled down when the pressure at the outlet of the primary diffuser is higher than the pressure of the mixed gas.

Advantageously, the mixing valve or low pressure stage valve is adjusted larger when the pressure at the outlet of the primary diffuser is higher than the pressure of the mixed gas.

Advantageously, the high pressure stage valve is throttled down when the pressure at the junction of the primary diffuser and the bypass line is higher than the pressure of the mixed gas.

Advantageously, the mixing valve or the low pressure stage valve is adjusted to be larger when the pressure at the connection of the primary diffuser to the by-pass branch is higher than the pressure of the mixed gas.

Has the advantages that: the high-low pressure air-entraining system utilizes the mixed gas to carry out high-pressure-level temperature reduction and pressure reduction by back compensation, reduces the pressure reduction conflict after high-low pressure mixing, is simpler to control than Hamilton Sundstrand Corporation, can apply other fluid mixing stability schemes, and is beneficial to uniform mixing of fluids.

Drawings

FIG. 1 is a conventional high and low pressure bleed air schematic;

FIG. 2 is a schematic diagram of high and low pressure bleed air from Hamilton Sundstrand Corporation;

FIG. 3 is a schematic diagram of a high and low pressure bleed air system according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a high-low pressure bleed air system according to another embodiment of the invention.

Detailed Description

Referring to fig. 3, the high-low pressure bleed air system adopted in an embodiment of the present invention includes a high-pressure stage 1, a low-pressure stage 2, a high-pressure stage valve 7, a low-pressure stage valve 3, a mixing valve 4, a branch 6, and a primary ejector composed of a primary nozzle 9 and a primary diffuser 10.

Wherein, a primary ejector is also arranged on the high-pressure pipeline, a primary nozzle 9 of the primary ejector is communicated with a high-pressure stage valve 7, a primary ejector port of the primary ejector is communicated with a mixed gas pipeline through a branch 6, and an outlet of a primary diffuser 10 of the primary ejector is communicated with a low-pressure pipeline consisting of a low-pressure stage 2 and a low-pressure stage valve 3.

High-pressure stage 1 high-temperature high-pressure air led out from a high-pressure area of the engine enters a primary nozzle 9 for cooling, pressure reduction and acceleration through regulation and control of a high-pressure stage valve 7, mixed gas enters a primary diffuser 10 for mixing, temperature and pressure regulation after the mixed gas is led out from a branch 6 and injected from a mixing valve 4, then is mixed with low-pressure low-temperature air regulated and controlled by a low-pressure stage 2 regulated and controlled by a low-pressure stage valve 3, and then is led into an air using end 5 through the mixing.

Referring to fig. 4, the high-pressure and low-pressure bleed air system according to another embodiment of the present invention includes a secondary ejector composed of a secondary nozzle 11 and a secondary diffuser 12, a branch 8, a high-pressure stage 1, a low-pressure stage 2, a high-pressure stage valve 7, a low-pressure stage valve 3, a mixing valve 4, a branch 6, and a primary ejector composed of a primary nozzle 9 and a primary diffuser 10.

The high-pressure pipeline is composed of a secondary ejector composed of a secondary nozzle 11 and a secondary diffuser 12, a primary ejector composed of a primary nozzle 9 and a primary diffuser 10, a high-pressure stage 1 and a high-pressure stage valve 7, an inlet of the secondary ejector composed of the secondary nozzle 11 and the secondary diffuser 12 is communicated with the high-pressure stage valve 7, and an outlet of the secondary diffuser 12 is communicated with an inlet of the primary nozzle 9. The secondary diffuser 12 is simultaneously connected to the branch 8. Low-pressure pipeline composed of low-pressure stage 2 and low-pressure stage valve 3.

The high-pressure level 1 high-temperature high-pressure air led out from the high-pressure area of the engine is cooled, depressurized and accelerated through a regulation secondary nozzle 11 of a high-pressure level valve 7, mixed temperature and pressure regulation is carried out after a primary diffuser 10 is led from a branch 8, the mixed air enters a primary nozzle 9 for cooling, depressurization and acceleration, mixed air enters the primary diffuser 10 for mixed temperature and pressure regulation after a mixing valve 4 is led from a branch 6, then the mixed air is mixed with low-pressure low-temperature air regulated and controlled by a low-pressure level 2 regulated and controlled by a low-pressure level valve 3, and then the mixed air is led into.

Claims

1. A high-low pressure bleed air system comprises a high-pressure pipeline consisting of a high-pressure stage (1) and a high-pressure stage valve (7) led out from a high-pressure region of an engine, and a low-pressure pipeline consisting of a low-pressure stage (2) and a low-pressure stage valve (3) led out from a low-pressure region of the engine, wherein mixed gas is discharged from the high-pressure pipeline and the low-pressure pipeline after passing through a mixing valve (4), and the high-low pressure bleed air system is characterized in that: the system is also provided with a primary ejector on the high-pressure pipeline, a primary nozzle (9) of the primary ejector is communicated with a high-pressure valve (7), a primary ejector port of the primary ejector is communicated with a mixed gas pipeline through a branch (6), and an outlet of a primary diffuser (10) of the primary ejector is communicated with the low-pressure pipeline.

2. The high and low pressure bleed air system of claim 1 wherein: the system is characterized in that the high-pressure pipeline further comprises a secondary ejector, a secondary nozzle (11) of the secondary ejector is communicated with the high-pressure level valve (7), a secondary ejection port is communicated with an outlet of a diffuser (10) of the primary ejector, and an outlet of a secondary diffuser (12) is communicated with an inlet of a primary nozzle (9).

3. High and low pressure bleed air system according to claim 1 or 2, characterized in that: the mixed gas is introduced into the gas using end (5).

4. The high and low pressure bleed air system of claim 3 wherein: the gas end (5) comprises a cockpit, an electronic device or a wing.

5. The high and low pressure bleed air system of claim 3 wherein: the high-pressure stage (1) and the low-pressure stage (2) are respectively joints led out from a high-pressure stage compressor and a low-pressure stage compressor of the engine.

6. The high and low pressure bleed air system of claim 1 wherein: the high-pressure stage (1) and the high-pressure stage valve (7) are made of high-temperature and high-pressure resistant materials.

7. The high and low pressure bleed air system of claim 1 wherein: when the pressure of the connection of the primary diffuser (10) and the through branch (6) is higher than the pressure of the mixed gas, the high-pressure stage valve (7) is reduced.

8. The high and low pressure bleed air system of claim 1 wherein: when the pressure of the connection of the primary diffuser (10) and the through branch (6) is higher than the pressure of the mixed gas, the mixing valve (4) or the low-pressure stage valve (3) is enlarged.

9. The high and low pressure bleed air system of claim 2 wherein: when the pressure of the connection of the primary diffuser (10) and the through branch (6) is higher than the pressure of the mixed gas, the high-pressure stage valve (7) is reduced.

10. The high and low pressure bleed air system of claim 2 wherein: when the pressure of the connection of the primary diffuser (10) and the through branch (6) is higher than the pressure of the mixed gas, the mixing valve (4) or the low-pressure stage valve (3) is enlarged.