Emissions analysis for a hydrogen-fueled low-pressure-ratio split-cycle engine

2024-01-4312

To be published on 11/05/2024

Event
Energy & Propulsion Conference & Exhibition
Authors Abstract
Content
Recuperated low-pressure-ratio split-cycle engines represent a promising engine configuration for applications like transportation and stand-alone power generation by offering a potential efficiency as high as 60%. However, it can be challenging to achieve the stringent NOx emission standard, such as Euro 6 limit of 0.4 gNOx/kWh, due to the exhaust cylinder high intake temperature. This paper presents experimental investigation of hydrogen-air combustion NOx emissions for such engines for the first time. Experiments are carried out using a simplified constant-volume combustion chamber with glow-plug ignition. Two fuel injection techniques are performed: direct injection and injection via a novel convergent-divergent injector. For the direct injection scenario, NOx levels are unsatisfactory with respect to the Euro 6 standards over a range of operating temperatures from 200 °C to 550 °C. Recorded NOx levels can reach twice the permissible limit which necessitates the implementation of after-treatment techniques. Interestingly, NOx emissions are found to be less by around 50% in the case of the novel injector. The enhanced fuel-air mixing mechanism using the convergent-divergent injector increases the ignition delay and shifts the combustion flame towards the premixed conditions and results in lower NOx levels.
Meta TagsDetails
Citation
Eldakamawy, M., and Picard, M., "Emissions analysis for a hydrogen-fueled low-pressure-ratio split-cycle engine," SAE Technical Paper 2024-01-4312, 2024, .
Additional Details
Publisher
Published
To be published on Nov 5, 2024
Product Code
2024-01-4312
Content Type
Technical Paper
Language
English