A flight test with a simplified hybrid laminar flow control (HLFC) system on the vertical tail plane (VTP) of an A320 aircraft was performed in April/May 2018. This HLFC system was a prototype for a simplified system that might be attractive for drag reduction of commercial long-range aircraft. The paper presents the design principles of a simplified HLFC system, including passive suction, and shows their application to aerodynamic and suction system design for the retrofit of an A320 VTP. Furthermore, sample flight test results will be presented and discussed.

中文翻译：

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A320 Fin上的混合层流控制：改造设计和样品结果

2018年4月/ 5月，在A320飞机的垂直尾翼（VTP）上使用简化的混合层流控制（HLFC）系统进行了飞行测试。该HLFC系统是简化系统的原型，该系统可能对阻力具有吸引力减少商用远程飞机。本文介绍了简化的HLFC系统的设计原理，包括被动吸气，并展示了其在空气动力学和吸气系统设计中对A320 VTP进行改造的应用。此外，还将介绍和讨论样品飞行测试结果。