Effect of the Hydrogen Injection Position on the Combustion Process of a Direct Injection X-Type Rotary Engine with a Hydrogen Blend

Qi Geng, Xuede Wang, Yang Du, Zhenghao Yang, Rui Wang and Guangyu He ()
Additional contact information
Qi Geng: Science and Technology on Plasma Dynamics Laboratory, Air Force Engineering University, Xi’an 710038, China
Xuede Wang: Science and Technology on Plasma Dynamics Laboratory, Air Force Engineering University, Xi’an 710038, China
Yang Du: School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Zhenghao Yang: Science and Technology on Plasma Dynamics Laboratory, Air Force Engineering University, Xi’an 710038, China
Rui Wang: School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Guangyu He: Science and Technology on Plasma Dynamics Laboratory, Air Force Engineering University, Xi’an 710038, China

Energies, 2022, vol. 15, issue 19, 1-19

Abstract: As a new type of power device, the X-type rotary engine (XRE) is regarded as a major revolution of the internal combustion engine with its special structure and high-efficiency hybrid cycle (HEHC). A 3D CFD model of an XRE with hydrogen–gasoline fuel is firstly built in this paper. The gasoline is premixed with air in the intake of the XRE. The hydrogen is directly injected (DI) into the cylinder with four different injection positions. The effects of the hydrogen injection position on the combustion process, engine thermodynamic performance, and unburned carbon emissions and NOx emissions are investigated. The results show that, due to the interaction between the in-cylinder main flow field and the injected hydrogen gas flow, different hydrogen concentration zones are formed at different injection positions. Furthermore, a larger hydrogen distribution area and being closer to the ignition position led to a faster in-cylinder combustion rate and a higher in-cylinder temperature and pressure. When the injection position is from the front to the back of the combustion chamber such as in position 2, the hydrogen has the widest distribution area and is closest to the ignition position, resulting in its fastest combustion speed. Meanwhile, the peak in-cylinder pressure is 3.73 MPa and the peak temperature is a maximum of 1835.16 K. Especially, the highest indicated thermal efficiency of 26.56% is found in position 2, which is 10.08% higher than that of position 4 (from right to left of the combustion chamber), which was 24.13%. At the same time, due to the best overall combustion effect, position 2 presents the lowest final unburned carbon emission of 0.36 mg, while it produces the highest NOx emission of 9.15 μg. Thus, this study provides important theoretical guidelines for the hydrogen injection strategy of the XRE using hydrogen–gasoline fuel.

Keywords: X-type rotary engine; hydrogen–gasoline fuel; in-cylinder direct injection; injection position; combustion performance; carbon emission (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

Downloads: (external link)
https://www.mdpi.com/1996-1073/15/19/7219/pdf (application/pdf)
https://www.mdpi.com/1996-1073/15/19/7219/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:15:y:2022:i:19:p:7219-:d:931067

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().