Propulsion system intake design and unsteady aerodynamics

许多主要经济体承诺到2050年实现温室气体净零排放。要实现这些目标，需要立即采取行动。预计将通过混合不同的技术实现净零，包括可持续航空燃料(SAF)、氢动力和混合动力飞机或全电动飞机。英国Jet Zero咨询公司预测，即使采用了SAF，并在氢气和电动飞机方面取得了突破，系统效率的提高也需要提供总体减排的36%。这些效率的提高可以通过推进和机身设计的进步来实现。紧凑型进气口的设计被认为是发展下一代导管推进系统的关键技术。紧凑型进气口预计将通过巡航阻力好处在减少燃料消耗方面提供好处，以及减少整个推进系统的质量。在安全关键的非设计条件下的进气性能，如高冲角爬升，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，新的推进系统可能无法实现。学生将测试这样一个假设，即为了设计紧凑型推进系统进气并实现固有的好处，需要考虑非定常扭曲的进气流场，以及风扇和进气之间的非定常相互作用。为了达到这一目的，需要从进气气动设计、风扇的可操作性和气动机械稳健性的角度对非定常扭曲流场进行评估。

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.