离心通风器是航空发动机润滑系统中回收滑油的主要部件, 工作时转速和通风流量对其分离滑油效率有一定的影响。以离心通风器内空气与滑油颗粒组成的两相流为研究对象, 计算不同工况下滑油油珠的穿透率。采用DPM模型模拟颗粒相喷射源, 应用雷诺应力模型计算连续相湍流流动。计算结果表明, 提高转速可以减小穿透率, 保障滑油的回收。加大通风流量时, 离心通风器的穿透率增加。
Centrifugal breather is the major part of lubricating oil recycling system in aviation engine, whose efficiency of oil-separation can be affected by air flow and speed.The transmittance of oil droplets under different conditions is calculated with the subjects of the two-phase flow in the Centrifugal breather which is consisted of air and oil particles, The DPM model is used to simulate the jet source of particles, and the Reynolds stress model is applied to calculate continuous phase turbulent flow.The results show that icreasing the speed can reduce transmittanceand ensure oil recovery, and thatthe more the ventilation flow, the more the penetration of centrifugal breather.
[1]《航空发动机设计手册》总编委会编;林基恕分册主编.航空发动机设计手册(第12册:传动及润滑系统)[M].北京:航空工业出版社, 2002.
[2]冯健美, 畅云峰, 张勇, 等.喷油压缩机卧式油气分离器特性的数值模拟及实验研究[J].西安交通大学学报, 2008, 42(5):561-577.
[3]柳吉祥.旋风分离器旋转气流特性分析[J].山东矿业学院学报, 1988, 7(3):26-33.
[4]徐让书, 宗庆贺, 刘立博, 等.湍流弥散对轴心通风器油气分离过程的影响[J].航空发动机, 2011, 37(4):75-79.
[5]王兵, 张会强, 王希麟.颗粒在大涡结构中的弥散[J].力学学报, 2003, 37(1):105-109.
[6]周华, 夏南.油气分离器内气液两相流的数值模拟[J].计算力学学报, 2006, 23(6):766-771.
[7]孙秀君, 孙海鸥, 姜任秋.油气分离器内油滴轨迹的数值模拟[J].应用科技, 2006, 33(10):69-72.
[8]徐继润, 罗茜.强制涡与水力旋流器[J].矿冶工程, 1989, 9(2):29-33.
