RACHEL (Robustly Achievable Combustion of Hydrogen Engine Layout

RACHEL项目在实践和合作伙伴关系方面建立在以前的技术开发基础上，带来了大型OEM（Spirit Europe和ITP UK），SME（Causeway和Reaction），研究和学术界（NCC和各种大学）以及英国供应商的子层，所有这些都带来了新奇和敏捷的工作。目的是开发技术和架构，提供有效和实用的氢燃气涡轮机动力装置，能够在整个操作范围内安全，实用和可靠地使用液态H2燃料，并提供商业上可行的产品。英国政府的绿色工业革命10点计划和Jet Zero推动了可持续航空旅行的目标。同样，航空航天技术研究所呼吁英国航空业优先考虑可持续性，并在环境方面采取行动。向替代当今煤油的能源过渡被视为技术优先事项之一，而氢是未来10-15年内可能为飞机提供动力的燃料之一。特别是，氢燃料燃气涡轮机燃烧系统的开发已被确定为零碳排放飞行的关键推动因素，因为燃气涡轮机动力飞机目前占当今航空碳排放的96%。尽管氢气是一种非常清洁的燃料，产生几乎纯净的水作为废气产物，但不幸的是，与煤油相比，氢气的能量密度非常低，这意味着燃料必须以低温液体的形式使飞机能够飞行任何可观的距离。液氢的极低温度（-253 °C）对于发动机部件来说是一个令人难以置信的恶劣环境，必须克服许多技术挑战才能生产出与当今发动机具有相同质量、性能、可靠性和安全性要求的氢动力燃气涡轮机。氢气燃烧带来了许多挑战，在氢燃料（低温和气态）的运输方面以及在热管理和二次和三次油系统方面。由于该系统利用电力，电气系统的合并和集成到发电厂是该项目的关键。此外，创新的储罐解决方案不仅能够开发气体燃料存储解决方案，还将解决清洗介质存储的问题。这个令人兴奋的项目由项目合作伙伴和英国政府机构BEIS、Innovate UK和ATI共同资助。

The RACHEL project builds on previous technology development in terms of both practices and the partnership, bringing a mix of large OEM's (Spirit Europe and ITP UK), SME's (Causeway and Reaction), research and Academia (NCC and various universities) plus subtiers of UK suppliers, all bringing novelty and agile working. The aim is to develop technologies and architectures that deliver an effective and practical hydrogen combustion gas turbine powerplant able to operate safely, practically and reliably with Liquid H2 fuel across the full operating range, and to deliver a commercially viable product. The UK government 10 Point Plan for a Green Industrial Revolution, and Jet Zero pushes forward the goal of sustainable air travel. Similarly, the Aerospace Technology Institute has called on the UK aviation industry to prioritise sustainability and lead action on environmental imperatives. Transition to alternative energy sources to today's kerosene is regarded as one of the technology priorities, and hydrogen is one fuel that could power aircraft in the coming 10-15 years. Particularly, development of a hydrogen-fuelled gas turbine combustion system has been identified as a key enabler for zero carbon emission flight, as gas turbine powered aircraft currently account for 96% of today's aviation carbon emissions.This is far from easy. Despite the advantage of being a very clean fuel, producing almost pure water as an exhaust product, hydrogen unfortunately has a very low energy density compared to kerosene, meaning that the fuel will have to be in the form of a cryogenic liquid to enable aircraft to fly any appreciable distance. The extremely low temperature of liquid hydrogen, -253 °C, is an incredibly harsh environment for the engine components, and many technological challenges will have to be overcome to produce a hydrogen-powered gas turbine that has the same exacting requirements of quality, performance, reliability and safety as today's engines.Combustion of hydrogen brings many challenges, both in terms of the transportation of the hydrogen fuel (cryogenic and gaseous) and also the heat management and secondary and tertiary oil systems. As the system leverages electrical power, the incorporation of electrical systems and the integration into the powerplant is key in this project. Additionally, innovative tank solutions will not only develop solutions capable of gaseous fuel storage but will also solve the issue of purging media storage.The exciting project is jointly funded through contribution from the project partners and UK government agencies, BEIS, Innovate UK and ATI.