摘要
直升机发动机吸入沙粒会严重影响寿命和可靠性,加装粒子分离器以净化进气必要性不言而喻。根据以往研究,碰撞是影响粒子在分离器中运动轨迹的主要因素。采用数值模拟方法,得到大量不同初始条件下反弹参数,分析相对位移、碰撞时间、反弹速度、反弹角度等参数与入射条件的关系特性。并将所得到的仿真结果与实验统计结果进行对比,能够较好吻合。最后将处理后的数据导入关系型数据库,建立沙粒与壁面碰撞反弹模型数据库基础表。文中的结果全面考虑多种初始条件的共同作用,使计算准确性大大提高,对指导分离器型面设计有一定贡献。
Inhalation sand will reduce the performance and life of the helicopter engine, and installation of particle separator to purify the intake air is necessary. Particle trajectory in IPS is mainly determined by collision-rebound based on previous research. Numerical simulation method is used in this paper to get bounce parameters under a lot of different initial conditions. The simulation results are good agreement with experimental results obtained by Grant, Malak and Tabakoff. Then the basic table of collision-rebound parameter is established, as well as the tables of impact factor which the influence by wall moving. Due to the utilization of database technology, this method can not only get result fast but also take various initial conditions into consideration, so the accuracy of the numerical simulation is greatly improved. The work in this paper has contributed to guide IPS surface design.
出处
《振动工程学报》
EI
CSCD
北大核心
2014年第4期589-597,共9页
Journal of Vibration Engineering
关键词
航空发动机
粒子
碰撞
轨迹
数值模拟
aero-engine
particle
collision
trajectory
numerical simulation
