Future civil aircrafts require simple, low-noise, and highly efficient trailing-edge flaps. In this study, a detailed numerical study for flap improvements using steady and unsteady Reynolds-averaged Navier–Stokes computations was conducted. A movable trailing edge (MTE) was applied to the main element as a passive flow control method to improve the traditional Fowler flap. A new concept of a backward seamless flap (BSLF) based on the MTE configuration is proposed, which can eliminate external fairings, simplify the mechanisms, and reduce the cruise drag. Then, a wall jet active flow control method was used to improve the BSLF. The improvement effect, flow mechanism, and parameter influences were investigated in detail. The results indicated that the MTE can increase the lift coefficient in the linear segment by 1.2–1.4 for an aerofoil and 0.79 for a wing by controlling the slot flow, energy distribution, and circulation. Moreover, the BSLF provided an improvement in performance higher than 27% over the plain flap, and the wall jet controlled BSLF configuration could reach or even exceed the MTE configuration in terms of performance. The zero-mass jet had a higher control effect and efficiency than the continuous jet. This study highlighted the significance and engineering value for technical improvement and concept exploration of new-generation high-lift devices.

未来的民用飞机需要简单、低噪音、高效的后缘襟翼。在这项研究中，使用稳态和非稳态雷诺平均 Navier-Stokes 计算对襟翼改进进行了详细的数值研究。可移动后缘 (MTE) 应用于主元件，作为一种被动流量控制方法，以改进传统的 Fowler 襟翼。提出了一种基于MTE构型的后向无缝襟翼（BSLF）新概念，可以消除外部整流罩，简化机构，减少巡航阻力。然后，采用壁射流主动流动控制方法来改善 BSLF。详细研究了改进效果、流动机理和参数影响。结果表明，MTE 可使机翼的线性段升力系数增加 1.2-1.4，增加 0. 79 通过控制狭缝流动、能量分布和循环来控制机翼。此外，与普通襟翼相比，BSLF 提供了高于 27% 的性能改进，并且壁射流控制的 BSLF 配置在性能方面可以达到甚至超过 MTE 配置。零质量射流比连续射流具有更高的控制效果和效率。本研究突出了对新一代高升力装置技术改进和概念探索的意义和工程价值。零质量射流比连续射流具有更高的控制效果和效率。本研究突出了对新一代高升力装置技术改进和概念探索的意义和工程价值。零质量射流比连续射流具有更高的控制效果和效率。本研究突出了对新一代高升力装置技术改进和概念探索的意义和工程价值。