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Will the Mars Helicopter Induce Local Martian Atmospheric Breakdown?
The Planetary Science Journal ( IF 3.8 ) Pub Date : 2021-03-10 , DOI: 10.3847/psj/abe1c3
W. M. Farrell 1 , J. L. McLain 1 , J. R. Marshall 2 , A. Wang 3
Affiliation  

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 Mars 2020 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 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.



中文翻译:

火星直升机会导致当地火星大气分解吗?

火星上的任何旋翼机都将在低压和多尘的环境中飞行。众所周知,地球上的直升机在沙质条件下飞行时会变得高度带电,部分原因是摩擦电效应。我们考虑了作为火星 2020 毅力任务的一部分在火星飞行的火星直升机侦察机 (MHS)(称为 Ingenuity)的可能性,也将由于谷物转子摩擦电相互作用而带电。考虑到火星大气压力约为 5 托,叶片上的摩擦电荷可能变得足够强烈,以刺激旋翼飞机表面附近的气体分解。我们将晶粒-叶片相互作用建模为一条电流线,在晶粒-叶片接触最大的区域沿叶片边缘形成。该电流随后在旋翼机的连接的准导电区域中传播。电荷在飞行器上积聚,去除电荷的耗散路径又回到大气中。我们发现,对于在环境大气灰尘负载中形成的叶片摩擦充电电流,系统电流平衡和电荷耗散可以通过标称大气传导电流来实现。然而,在起飞和着陆时,旋翼机可能处于旋翼产生的颗粒云中,导致旋翼机附近的局部大气电击穿。我们特别注意到击穿时的大气电流不足以对 Ingenuity 本身造成任何危害,但 Ingenuity 操作可以被视为一项独特的实验,它提供了对火星近地表大气电特性的测试。我们发现,对于在环境大气灰尘负载中形成的叶片摩擦充电电流,系统电流平衡和电荷耗散可以通过标称大气传导电流来实现。然而,在起飞和着陆时,旋翼机可能处于旋翼产生的颗粒云中,导致旋翼机附近的局部大气电击穿。我们特别注意到击穿时的大气电流不足以对 Ingenuity 本身造成任何危害,但 Ingenuity 操作可以被视为一项独特的实验,它提供了对火星近地表大气电特性的测试。我们发现,对于在环境大气灰尘负载中形成的叶片摩擦充电电流,系统电流平衡和电荷耗散可以通过标称大气传导电流来实现。然而,在起飞和着陆时,旋翼机可能处于旋翼产生的颗粒云中,导致旋翼机附近的局部大气电击穿。我们特别注意到击穿时的大气电流不足以对 Ingenuity 本身造成任何危害,但 Ingenuity 操作可以被视为一项独特的实验,它提供了对火星近地表大气电特性的测试。然而,在起飞和着陆时,旋翼机可能处于旋翼产生的颗粒云中,导致旋翼机附近的局部大气电击穿。我们特别注意到击穿时的大气电流不足以对 Ingenuity 本身造成任何危害,但 Ingenuity 操作可以被视为一项独特的实验,它提供了对火星近地表大气电特性的测试。然而,在起飞和着陆时,旋翼机可能处于旋翼产生的颗粒云中,导致旋翼机附近的局部大气电击穿。我们特别注意到击穿时的大气电流不足以对 Ingenuity 本身造成任何危害,但 Ingenuity 操作可以被视为一项独特的实验,它提供了对火星近地表大气电特性的测试。

更新日期:2021-03-10
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