Increasing the Effective AKI of Fuels Using Port Water Injection (Part II) Michigan Technological University

Format:

Book

Conference/Event

Author/Creator:

Gopujkar, Siddharth, author.

Contributor:

Barros, Sam

Bonfochi Vinhaes, Vinicius

Hansley, William

Worm, Jeremy

Conference Name:

WCX SAE World Congress Experience (2022-04-05 : Detroit & Online, Michigan, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2022

Summary:

This is the second part of a study on using port water injection to quantifiably enhance the knock performance of fuels. In the United States, the metric used to quantify the anti-knock performance of fuels is Anti Knock Index (AKI), which is the average of Research Octane Number (RON) and Motor Octane Number (MON). Fuels with higher AKI are expected to have better knock mitigating properties, enabling the engine to run closer to Maximum Brake Torque (MBT) spark timing in the knock limited region. The work done in part I of the study related increased knock tolerance due to water injection to increased fuel AKI, thus establishing an effective AKI' due to water injection. This paper builds upon the work done in part I of the study by repeating a part of the test matrix with Primary Reference Fuels (PRFs), with iso-octane (PRF100) as the reference fuel and lower PRFs used to match its performance with the help of port water injection. Additionally, the unburned gas pressure-temperature trajectories for varying loads were analyzed to better understand the underlying physics of port water injection in engines. Finally, a comparison was made between the amount of water and excess fuel required to gain a similar increase in effective AKI

Notes:

Vendor supplied data

Publisher Number:

2022-01-0434

Access Restriction:

Restricted for use by site license