航空发动机增压式离心通风器流动与分离特性

doi:10.7527/S1000-6893.2023.28675

Abstract

Abstract:

The refined design of aero-engine oil systems relies on the mastery of the working performance of key components， including separators affecting the bearing chamber pressure and oil consumption. To study the flow and separation characteristics of a pressurized centrifugal separator， we obtain the effects of design parameters on pressure difference， separation efficiency， and the minimum separation diameter by numerical simulation， and quantitatively evaluate the sensitivity of design parameters. The results show that increasing the rotating speed can improve the separation and reduce the minimum separation diameter while increasing the airflow pressure. With rotating speed of 25 000 r/min， the air mass flow rate of 10 g/s， and the inlet pressure of 2 700 Pa lower than the outlet pressure， the separation efficiency can reach 99.5%. Increasing the air mass flow rate weakens the aerodynamic pressurization effect of the separator， and is not conducive to the effective separation of oil droplets. Adjusting the number of blades can achieve the best effect of aerodynamic pressurization， and the maximum variation of pressure difference can exceed by 30%. However， the number of blades has little effect on separation efficiency and the minimum separation diameter. The rotating speed has a significant influence on the pressure difference and separation efficiency， while the minimum separation diameter is most significantly affected by the air mass flow rate. In addition， the working characteristics of the separator are also affected by the interaction between the design parameters， and the reasonable matching of the design parameters according to the sensitivity coefficient can further improve the working performance.

Key words: pressurized centrifugal separator, pressure difference, separation efficiency, minimum separation diameter, sensitivity analysis

CLC Number:

V233.4

Le JIANG, Yibiao CHEN, Yanjun LI, Guilin LI, Tao LIU. Flow and separation characteristics of pressurized centrifugal separator for aero⁃engine[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(2): 128675-128675.

Figures/Tables 24

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边界名称	边界类型	边界参数	数值
气流进口	质量流量边界	气流进口质量流量/（g·s^-1）	6，10，15，20
滑油进口	质量流量边界	滑油进口质量流量/（g·s^-1）	1
出口	压力出口边界	出口压力/Pa	0
旋转叶轮转轴	无滑移壁面（旋转）	转速/（r·min^-1）	1 000，5 000，9 000，13 000，18 000，22 000，25 000
试验腔静子叶片	无滑移壁面（静止）

网格	网格数量	压差/Pa	分离效率/%
G1	1 357 826	-652	98.32
G2	2 047 932	-698	98.45
G3	3 105 982	-720	98.59
G4	4 558 674	-731	98.72
G5	6 823 258	-736	98.75

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Flow and separation characteristics of pressurized centrifugal separator for aero⁃engine

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