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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扫气效率评估

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摘要

The effectiveness of a helicopter particle separation system has been numerically assessed at practical operating conditions and sand environments for various scenarios. The particle separation mechanism and its limitations are revealed by the predicted flow field characteristics and particle trajectories. The separation.by.inertia concept is effective for removing large particles, but problematic for small particles of diameter ≤36 μm for the configuration and operating conditions considered in the present study. It is also found that particle size, shape factor, and rebound characteristics exert substantial effects on particle scavenge efficiency. However, the effects of gravity, particle inlet velocity, inlet mass distribution, and engine.operating conditions on scavenge efficiency are minor or limited. Finally, a few suggestions for further investigation on engine particle separation systems are included.
机译:直升机颗粒分离系统的有效性已在各种情况下的实际操作条件和沙土环境中进行了数值评估。通过预测的流场特性和粒子轨迹揭示了粒子分离机理及其局限性。惯性分离概念对于去除大颗粒是有效的,但对于本研究中考虑的配置和操作条件,直径≤36μm的小颗粒存在问题。还发现颗粒尺寸,形状因子和回弹特性对颗粒清除效率产生实质性影响。然而,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。最后,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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