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ASSESSMENT OF SCAVENGE EFFICIENCY FOR A HELICOPTER PARTICLE SEPARATION SYSTEM

机译：直升机颗粒分离系统的清除效率评估

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摘要

The effectiveness of a typical helicopter particle separation system has been numerically assessed at practical operating conditions and sand environments for various scenarios. The particle separation mechanism and its limitation are revealed by the flow characteristics and particle trajectories in the flow-field. The separation-by-inertia concept is effective for removing large particles, but problematic for small particles of diameter (d) ≤ 36μm. The particle size, shape factor, and rebound characteristics exert substantial effects on particle scavenge efficiency. On the other hand, the effects of gravity, particle inlet velocity, inlet mass distribution, and engine operating conditions on scavenge efficiency are minor or limited'for the configurations and operating conditions considered in the present study. In addition, a few suggestions for further investigation on engine particle separation systems are included.
机译：在各种情况下，在实际操作条件和沙土环境下，已经通过数值评估了典型直升机颗粒分离系统的有效性。通过流场中的流动特性和颗粒轨迹揭示了颗粒分离机理及其局限性。惯性分离概念可有效去除大颗粒，但对于直径（d）≤36μm的小颗粒则存在问题。颗粒大小，形状因子和回弹特性对清除颗粒的效率产生实质性影响。另一方面，对于本研究中考虑的构造和运行条件，重力，颗粒入口速度，入口质量分布和发动机运行条件对扫气效率的影响很小或有限。此外，还包括一些进一步研究发动机颗粒分离系统的建议。

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