arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2102.04181astro-ph.EPastro-ph.IMphysics.space-ph
收藏

火星直升机会引发火星局部大气层破坏吗?

Will the Mars Helicopter Induce Local Martian Atmospheric Breakdown?

W. M. Farrell, J. L. McLain, J. R. Marshall, A. Wang

摘要:

火星上的任何旋翼飞行器都将在低压和尘土飞扬的环境中飞行。众所周知,地球上的直升机变得高度带电,部分原因是在沙质条件下飞行时的摩擦电效应。我们认为,作为火星2020毅力任务的一部分,在火星上飞行的火星直升机侦察机(MHS),也将由于颗粒转子摩擦电相互作用而带电。考虑到火星大气的低气压约为5托,叶片上的摩擦电荷可能会变得足够强烈,以刺激旋翼飞行器表面附近的气体击穿。我们将颗粒-刀片相互作用建模为沿着刀片边缘在颗粒-刀片接触最大的区域中形成的电流线。然后,该电流在旋翼飞行器的整个连接的准导电区域中传播。电荷在飞行器上积累,而消除电荷的耗散途径又回到了大气中。我们发现,对于叶片摩擦充电电流,形成在环境大气灰尘负载,系统电流平衡和电荷耗散可以通过标称大气导电电流来完成。然而,在起飞和着陆时,旋翼机可能处于旋翼产生的微粒云中,导致旋翼机附近的局部大气电击穿。我们特别注意到,击穿中的大气电流并不足以对Incidity本身造成任何危害,但Incidity操作可以被认为是一个独特的实验,它提供了对火星近地表大气电特性的测试。

英文摘要:

Any rotorcraft on Mars will fly in a low pressure and dusty environment. It is well known that helicopters on Earth become highly-charged due, in part, to triboelectric effects when flying in sandy conditions. We consider the possibility that the Mars Helicopter Scout (MHS), called Ingenuity, flying at Mars as part of the Mars2020 Perseverance mission, will also become charged due to grain-rotor triboelectric interactions. Given the low Martian atmospheric pressure of ~ 5 Torr, the tribocharge on the blade could become intense enough to stimulate gas breakdown near the surface of the rotorcraft. We modeled the grain-blade interaction as a line of current that forms along the blade edge in the region where grain-blade contacts are the greatest. This current then spreads throughout the entire connected quasi-conductive regions of the rotorcraft. Charge builds up on the craft and the dissipative pathway to remove charge is back into the atmosphere. We find that for blade tribocharging currents that form in an ambient atmospheric dust load, system current balance and charge dissipation can be accomplished via the nominal atmospheric conductive currents. However, at takeoff and landing, the rotorcraft could be in a rotor-created particulate cloud, leading to local atmospheric electrical breakdown near the rotorcraft. We especially note that the atmospheric currents in the breakdown are not large enough to create any hazard to Ingenuity itself, but Ingenuity operations can be considered a unique experiment that provides a test of the electrical properties of the Martian near-surface atmosphere.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑