Insights into Combustion and Performance of HCCI Engine Fed with PODE1 and H2-rich PODE1-Reformate
- Delivery
- Available on this site
- Format
- Price
- Non-members (tax incl.)：￥1,100 Members (tax incl.)：￥880
- Publication code
- 20239241
- Paper/Info type
- Other International Conferences
- Pages
- 1-8(Total 8 p)
- Date of publication
- Aug 2023
- Publisher
- JSAE & SAE
- Language
- English
- Event
- 2023 P, E&L
Detailed Information
| Category(E) | OS1 Application of Alternative Fuels Reducing CO2 |
|---|---|
| Author(E) | 1) Denis Buntin, 2) Leonid Tartakovsky |
| Affiliation(E) | 1) Faculty of Mechanical Engineering, Technion – Israel Institute of Technology, 2) Faculty of Mechanical Engineering, Technion – Israel Institute of Technology |
| Abstract(E) | A transition to sustainable energy origins, synthetic carbon-neutral energy carriers and efficient combustion concepts is strongly discussed as a key component of a greener and secure energy future. In particular, an enhancement of internal combustion engine (ICE) performance utilizing potential carbon-neutral fuels, waste heat recovery (WHR) and efficient combustion modes is of interest. This study numerically investigates the combustion and performance of ICE operated under homogenous charge compression ignition (HCCI) mode controlled by mixing of polyoxymethylene dimethyl ether 1 (PODE1) and its hydrogen-rich reforming products (PODE1-reformate), obtained through thermo-chemical recuperation of the engine exhaust gas. PODE1 (CH3O(CH2O)CH3), a promising low-emission/carbon-neutral alternative, is liquid at ambient conditions (BP=42°C), has high oxygen content (42.1 wt.%), and no C-C bonds (reduced soot tendency). The simulations were held in Chemkin-Pro and GT-Power utilizing a predictive single-zone/cylinder HCCI-engine model and low-temperature-chemistry-containing mechanisms (from simple to detailed) of PODE1 oxidation and pyrolysis. The in-cylinder heat transfer was modeled using Woschni correlation, without swirl. The PODE1-reformate was assumed to consist of H2/CO2 only, i.e., complete reforming. The analysis spanned H2/PODE1 ratios from 0.5 to 20, engine speeds from 1000 to 4000 rpm and BMEP from 2 to 6 bar at compression ratio of 16. The results showed that HCCI combustion-control is feasible by varying the H2/PODE1 ratio. The higher H2/PODE1 ratio causes a longer ignition delay time (IDT) (due to the presence of low-reactive fuel (i.e., H2)), suitable for low engine-speeds and high-loads; the lower H2/PODE1 ratio shortens the IDT (high-reactive fuel (i.e., PODE1) presence), suitable for high engine-speeds and low-loads. The overall HCCI-engine control map, based on H2/PODE1 and PODE1/air ratios, was obtained. Notably, high HCCI engine efficiencies of 40.6-48.4% were achieved, at relatively low compression ratio of 16, in addition to low amount of NOx and CO emissions. |
