A Numerical Study on Turbocharging System for Hydrogen Combustion Engine Universiti Teknologi Malaysia

Format:

Book

Conference/Event

Author/Creator:

Kim, Jeyoung, author.

Contributor:

Rajoo, Srithar

Conference Name:

15th International Conference on Engines & Vehicles (2021-09-12 : Capri, Italy)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2021

Summary:

Hydrogen has been considered as one of the promising alternative fuels as it could eliminate carbon-based emissions completely. There has been extensive research carried out regarding hydrogen combustion in SI-engines. Some of these researches highlighted that hydrogen combustion operated on port fuel injection (PFI) type SI-engines suffer from low power density (kW/L). Typically, its peak power is 35-50% lower than the equivalent gasoline counterpart. The primary reason is that the hydrogen will take up large portion of the combustion chamber due to low density. This results in smaller room for air in the cylinder which leads to reduced power. Thus, in order to increase the power density, turbocharging system will play an important role for hydrogen combustion, in fact even more than the gasoline counterpart. Nevertheless, the turbocharged hydrogen SI engine in many works has shown poor power density which is attributed by improper matching between the turbocharger and engine. Therefore, the present study numerically investigated the turbocharging system with an aim of achieving the same full load performance as a 1.6L turbocharged PFI SI-engine using AVL-BOOST. The baseline gasoline engine has been tested with an AC Dyno and the results were used to validate the AVL-BOOST model. The engine size was maintained, and only the turbocharging system was modified. From the turbocharger and engine matching process, it was identified that the relatively higher boost pressure ratio close to 3 is required to achieve the same level of performance since the hydrogen engine demands 50% higher air mass flow compared to gasoline engine under the same power output. In addition, low turbine inlet temperature (low enthalpy) was observed compared to the gasoline engine. From the simulation results, 2-stage turbocharging system with variable geometry turbine (VGT) was suggested to deliver the required high level of boost pressure. As a result, 1.6L turbocharged hydrogen PFI SI-engine demonstrated comparable performance as gasoline counterpart at full load, while achieving higher thermal efficiency and lower fuel consumption

Notes:

Vendor supplied data

Publisher Number:

2021-24-0094

Access Restriction:

Restricted for use by site license