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

等离子体合成射流执行器（PSJA）是一种主动流量控制装置。它能够以高重复率产生强大的射流。在高速流动控制中，特别是在减轻激波边界层相互作用的不利影响方面具有很好的应用前景。尽管到目前为止取得了重大改进，但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，在英国皇家学会和中国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型电压继电器电路（VRC）。新的VRC概念允许多个PSJA通过一个高压电源单元驱动，这是导致PSJA实际应用的技术突破。因此，提出了vrc驱动的PSJA阵列作为控制跨声速激波边界层相互作用（TSWBLI）的流动控制方法，为进一步提高飞机及其推进系统的性能奠定了基础。在英国，航空航天技术研究所（ATI）明确将“推动冲击冲击边界”作为未来十年英国航空航天工业发展计划的战略重要目标。因此，研究成果将有助于ATI的目标，并有助于巩固英国航空航天工业的领先地位。PI和他的合作者进行的初步实验表明，vrc驱动的PSJA阵列在激波调制中是有效的。此外，在国家风洞设施的支持下，伦敦城市大学的跨声速风洞正在得到加强，以实验跨声速状态下的空气动力学问题。因此，我们申请资金来实现vrc驱动的PSJA阵列对TSWBLI的控制。研究成果将对英国航空航天业产生直接影响。虽然vrc驱动的PSJA在本项目中用于跨声速流动，但它也很容易用于激波边界层相互作用占主导地位的超音速应用。

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.