Data Availability Statement-ShuyuMao

Ionic wind has shown promising applications in many fields, but it still encounters the challenges of low wind velocity and high discharge voltage. Here we propose a method of enhancing the velocity of ionic wind at given discharge voltages by Joule-heating the discharge electrode in a wire-grid corona discharge scheme. Ionic wind velocity is found to increase with the temperature of the discharge electrode with an enhancement by a magnitude of more than one order at low discharge voltages. Despite of additional energy consumption for Joule-heating, the overall energy efficiency of ionic wind production can be simultaneously enhanced. Numerical simulations indicate that the enhancement of ionic wind velocity is attributed to the increase of the mean free path of electron-molecule collisions and thus ion density near the hot electrode. Furthermore, we get a further ionic wind velocity enhancement by several times via covering the hot discharge electrode with Y2O3 film to increase electron density near the hot electrode by thermionic electron emission.

电离风在众多领域展现出广阔的应用前景，然而，其仍面临风速较低及放电电压较高的挑战。本研究提出了一种通过在导线网格电晕放电方案中对放电电极进行焦耳加热，以在特定放电电压下提升电离风速度的方法。研究发现，电离风速度随放电电极温度的升高而增加，在低放电电压下，其速度提升幅度超过一个数量级。尽管焦耳加热带来了额外的能耗，但电离风生产的整体能效得以同步提升。数值模拟表明，电离风速度的提升归因于电子-分子碰撞平均自由程的增加以及热电极附近的离子密度增加。此外，通过在热放电电极上覆盖Y2O3薄膜，利用热电子发射增加热电极附近的电子密度，我们进一步实现了电离风速度的数倍提升。