Plasma Synthetic Jet Actuators for the Control of Transonic Shock Wave Boundary Layer Interaction

等离子体合成射流激励器（PSJA）是一种主动流动控制装置。它能够在高重复频率下产生强大的射流。PSJA在高速流动应用中具有很好的控制能力，特别是在减轻激波边界层干扰的不利影响方面。尽管到目前为止已经取得了显着的改进，PSJA仍然存在问题，例如如果使用PSJA阵列，则需要多个高压电源单元。最近，在皇家学会和国家自然科学基金的联合资助下，通过首席研究员（PI）的合作项目提出了新颖的电压继电器电路（VRC）。新的VRC概念允许通过单个高压功率单元驱动多个PSJA，这是PSJA实际应用的技术突破。因此，VRC驱动的PSJA阵列的流动控制方法来操纵跨音速激波边界层干扰（TSWBLI），这是进一步提高飞机及其推进系统的性能的基础。在英国，航空航天技术研究所（ATI）明确将“推动冲击抖振边界”作为未来十年英国航空航天工业发展计划的重要战略目标。该研究成果将有助于ATI目标的实现，并有助于巩固英国航空航天工业的领先地位。PI及其合作者进行的初步实验表明，VRC驱动的PSJA阵列在冲击调制中是有效的。此外，伦敦大学城市学院的跨音速风洞正在得到加强，以便在国家风洞设施的支持下进行跨音速区域的空气动力学问题实验。因此，资金被用于将VRC驱动的PSJA阵列实施到TSWBLI的控制中。研究成果将对英国航空航天部门产生直接影响。尽管VRC驱动的PSJA在本项目中用于跨音速流，但它在激波边界层干扰占主导地位的超音速应用中也很有用。

The plasma synthetic jet actuator (PSJA) is a type of active flow control device. It is able to generate powerful jet at high repetition rate. The PSJA has promising control capability in high-speed flow applications, especially in alleviating the adverse effects of shock wave boundary layer interaction. Despite the significant improvements made so far, the PSJA still suffers problem such as the requirement of multiple high-voltage power units if a PSJA array is under use. Very recently, the novel voltage relay circuit (VRC) is proposed through the principal investigator (PI)'s collaborative project under the joint funding from the Royal Society and Natural Science Foundation of China. The new VRC concept allows multiple PSJAs to be driven through one single high-voltage power unit, which is a technological breakthrough leading to the practical application of PSJA. The VRC-driven PSJA array is thus proposed as the flow control method to manipulate the transonic shock boundary layer interaction (TSWBLI), which underpins further improvement of the performances of aircraft and its propulsion system. In the UK, the Aerospace Technology Institute (ATI) explicitly includes 'pushing the shock buffeting boundary' as a strategically important target in the development plan for UK aerospace industries for the coming decade. The research outcome will thus contribute to the ATI target and help consolidate the leading position of UK aerospace industry.The preliminary experiment carried by the PI and his collaborator reveals that the VRC-driven PSJA array is effective in shock modulation. Moreover, the transonic wind tunnel at City, University of London is being strengthened to experiment aerodynamic problems in the transonic regime through the support of National Wind Tunnel Facility. Therefore, funding is applied to implement the VRC-driven PSJA array into the control of TSWBLI. The research outcome is going to exert direct impact to the UK aerospace sector. Although the VRC-driven PSJA is used in the transonic flow in the present project, it is also readily useful in supersonic applications where shock wave boundary layer interaction dominates.