不同前缘形貌对风扇转子叶片颗粒物的冲蚀磨损

Particulate Erosion Wear of Fan Rotor Blades with Different Leading Edge Morphology

涡轮风扇发动机在实际运行过程中会吸入夹杂在空气中的颗粒物,颗粒物撞击会造成前缘退化成钝头形状,影响内部流场,导致发动机气动性能的下降,基于钝头叶片进行前缘优化能够恢复其气动性能。为了探究气动优化过程对颗粒物冲蚀速率的影响,以CFM56-7B大涵道比涡轮风扇发动机风扇转子叶片为研究对象,采用定常数值模拟方法,利用单向流固耦合计算研究颗粒物冲蚀磨损速率,结果表明:冲蚀区域靠近叶片前缘,随着叶高增加,冲蚀率不断增加。大部分颗粒物会与风扇叶片发生碰撞,碰撞位置集中在风扇叶片压力面处。冲蚀率与颗粒物浓度之间成正比例关系。近喘点工况相较于设计点工况,其冲蚀区域更加靠近叶片前缘。钝头叶片前缘处颗粒物冲蚀速率相较于原始叶片会增大,基于气动性能的前缘优化叶片能够降低冲蚀速率,但此规律并非适用于所有位置。

In the actual operation process,the impact of particles will cause the leading edge to degenerate into a blunt shape,which will affect the internal flow field and lead to the decline of aerodynamic performance of the engine.Leading edge optimization based on blunt blades can restore its aerodynamic performance.In order to explore the influence of aerodynamic optimization process on the erosion rate of particle,the fan rotor blade of the CFM56-7B high bypass ratio turbofan engine was taken as the research object,and the steady numerical simulation method and unidirectional fluid-structure coupling calculation were used to study the erosion wear rate of particle.The results show that the erosion area is close to the leading edge of the blade,and the erosion rate increases with the increase of blade height.Most particles collide with fan blades at the pressure surface.The erosion rate is directly proportional to the concentration of particulate matter.Compared with the design point condition,the erosion area is closer to the leading edge of the blade at the surge point.The erosion rate of particle at the leading edge of blunt blade increases compared with that of the original blade.The optimized leading edge blade based on aerodynamic performance can reduce the erosion rate,but this law is not applicable to all positions.