EPSRC ICASE/Rolls Royce - Hydrogen Fuel Flow Control for Zero Carbon propulsion systems

EPSRC ICASE/劳斯莱斯 - 零碳推进系统的氢燃料流量控制

• 批准号: 2902887
• 金额: --
• 依托单位: University of Oxford
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2902887
• 关键词: EPSRC; ICASE; Rolls; Royce; Hydrogen

Project DescriptionThis project falls within the EPSRC Engineering research area.The studentship is jointly offered by the University of Oxford and Rolls-Royce under the EPSRC iCase award scheme.Hydrogen as a fuel in aircraft propulsion is one potential avenue in achieving carbon reduction. One of the big challenges for hydrogen fuelled aerospace propulsion is the use of liquid hydrogen to enable higher payload/range aircraft. Liquid Hydrogen requires compression and heating before being metered ahead of introduction in the combustion chamber. Aerospace requirements for accurate steady and transient fuel flow metering in challenging operating temperature and vibration environments drives the need for bespoke innovative reliable low weight solutions. There is also a potential need for modulated metering of individual combustor burner flows where there are few technological solutions present due to high temperature environment.The main objective of this project is to investigate novel fluidic valve concept with the application to hydrogen fuel flow metering. Fluidic devices utilize fluid mechanic phenomena to control the behaviour of a subject fluid (such as hydrogen fuel) while removing the need for any moving parts. Previous work has looked at fluidic diverters and switched vortex valves. This work will research the working principle of a novel opposed jet amplifier deviceThe Opposed Jet Amplifier theoretically works by pointing two jets of the same fluid at each other, using one small but powerful jet to cut off a less powerful jet coming from a larger inlet. While it is known that a smaller jet can in fact cut off the flow of a larger one (as long as the jet velocities are different), the exact relationship between the size of the jets and what jet velocities are required is not yet known and will likely determine the viability of such class of devices. The first aim of this research is to characterise performance of a canonical version of the device under series of conditions. As the device utilises opposing jets that are inherently unstable and so detailed computational and experimental studies will be carried out to understand optimum performance. Finally a more engine scale geometry will be developed and tested.Throughout this research a multitude of engineering methodologies are being used to determine and improve the performance of the device. 3D printing is being used to prototype the device and evaluate initial performance. This is being used in conjunction with computational fluid dynamics to simulate performance at conditions that can't be tested with a prototype device (such as at very high pressures). Analytical predictions are also being carried out to compare with experiments and computational studies. The research project will therefore include:Research into fluid dynamics of opposed jetsInvestigation into analytical modelling of the device operation Computational modelling of the canonical device behaviour and experimental validation on low pressure facilities.Preliminary design of a suitable engine scale device and testingThis project falls within the EPSRC Fluid dynamics, aerodynamics and control research areas.

项目描述该项目属于 EPSRC 工程研究领域。该奖学金由牛津大学和罗尔斯·罗伊斯公司根据 EPSRC iCase 奖励计划联合提供。氢作为飞机推进燃料是实现碳减排的一种潜在途径。氢燃料航空航天推进的一大挑战是使用液氢来实现更高有效载荷/航程的飞机。液态氢在引入燃烧室之前进行计量之前需要压缩和加热。航空航天在具有挑战性的工作温度和振动环境中对精确稳定和瞬态燃油流量计量的要求推动了对定制创新可靠的低重量解决方案的需求。由于高温环境，还存在对单个燃烧室燃烧器流量进行调制计量的潜在需求，而由于高温环境，目前几乎没有技术解决方案。该项目的主要目标是研究新颖的流体阀概念及其在氢燃料流量计量中的应用。流体装置利用流体力学现象来控制目标流体（例如氢燃料）的行为，同时无需任何移动部件。之前的工作着眼于流体分流器和开关涡流阀。这项工作将研究一种新颖的对置射流放大器装置的工作原理。对置射流放大器理论上的工作原理是将同一流体的两股射流相互指向，使用一个小但强大的射流来切断来自较大入口的功率较小的射流。虽然众所周知，较小的射流实际上可以切断较大射流的流动（只要射流速度不同），但射流尺寸与所需射流速度之间的确切关系尚不清楚，并且可能会决定此类设备的可行性。这项研究的首要目标是表征该设备的规范版本在一系列条件下的性能。由于该设备使用本质上不稳定的相对射流，因此将进行详细的计算和实验研究以了解最佳性能。最后，将开发和测试更大发动机尺寸的几何形状。在这项研究中，将使用多种工程方法来确定和提高设备的性能。 3D 打印被用来制作设备原型并评估初始性能。它与计算流体动力学结合使用，以模拟无法使用原型设备测试的条件（例如在非常高的压力下）的性能。还进行了分析预测，以与实验和计算研究进行比较。因此，该研究项目将包括：研究对置射流的流体动力学研究设备操作的分析模型典型设备行为的计算模型和低压设施的实验验证。合适的发动机规模设备的初步设计和测试该项目属于EPSRC 流体动力学、空气动力学和控制研究领域。