Propulsion system intake design and unsteady aerodynamics

许多主要经济体已承诺到2050年实现温室气体净零排放。为了实现这些目标，必须立即采取行动。预计净零将通过不同技术的组合来实现，包括可持续航空燃料（SAF），氢动力和混合动力或全电动飞机。英国Jet Zero咨询公司预测，即使采用SAF并在氢和电动飞机方面取得突破，系统效率的提高也需要提供36%的整体减排量。这些效率的提高可以通过推进系统和机体设计的改进来实现，紧凑进气道的设计被认为是下一代管道推进系统发展的关键技术。紧凑的进气道有望通过巡航阻力的好处以及减少整个推进系统的质量来减少燃料燃烧。在安全关键的非设计状态下的进气道性能，如大迎角爬升，是飞机认证过程的一部分。如果没有足够的空气动力学知识和设计方法，新型推进系统可能不可行。学生将检验这样的假设：为了设计紧凑的推进系统进气道并实现其固有的优点，需要考虑非定常畸变进气道流场以及风扇和进气道之间的非定常相互作用。为了实现这一点，非定常畸变流场需要从进气道气动设计、风扇可操作性和气动机械鲁棒性的角度进行评估。

Many major economies have committed to net zero greenhouse gas emissions by 2050. To realise these targets immediate action is required. It is expected that net zero will be achieved through a mix of different technologies, including sustainable aviation fuels (SAF), hydrogen powered and hybrid or all electric aircraft. The UK Jet Zero consultation forecasts that even with an uptake of SAF and breakthroughs in hydrogen and electric aircraft, system efficiency improvements will need to provide 36% of the overall emissions abatement. These efficiency improvements can be achieved through advances in propulsion and airframe design.The design of compact intakes is considered a vital technology in the development of next generation ducted propulsion systems. Compact intakes are expected to provide benefits in terms of fuel burn reduction through cruise drag benefits as well as a reduction in the mass of the overall propulsion system. Intake performance at safety critical off-design conditions such as high incidence climb-out is part of the aircraft certification process. Without adequate aerodynamic understanding and design methods, novel propulsion systems may not be viable.The student will test the hypothesis that to design a compact propulsion system intake and to realise the inherent benefits, the unsteady distorted intake flow-field, as well as the unsteady interaction between fan and intake, need to be accounted. To achieve this, the unsteady distorted flow-field needs to be assessed from the point of view of the intake aerodynamic design, fan operability and aero-mechanical robustness.