Experimental and Kinetic Study of Methane Blending on The Laminar Combustion and Emission Characteristics of Ammonia Under Various Oxygen Contents at High Temperature and Pressure Dalian University of Technology

Format:

Book

Conference/Event

Author/Creator:

YU, Yuantao, author.

Contributor:

Cui, Zechuan

Dai, Zhizhuo

Hou, Chunlei

Nishida, Keiya

Ye, Mingyuan

Yin, Shuo

Zhang, Xiaolei

Conference Name:

SETC2025: 29th Small Powertrains and Energy Systems Technology Conference (2025-11-10 : Florence, Italy)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2025

Summary:

As a carbon-free fuel, ammonia is one of the alternatives to traditional fossil fuels, but its combustion characteristics are poor, and it is usually optimized by blending methane and increasing oxygen content. However, there are few relevant studies under different conditions. In this study, the laminar burning velocities (LBV) and flame instability of NH3/CH4/O2/N2 mixture at high initial temperature (T), high initial pressure (p), various oxygen contents (Ω) and methane energy ratios (α) are analyzed using a constant volume combustion chamber (CVCC). Through numerical simulation, how various oxygen contents and methane energy ratios affect the combustion characteristics of NH3/CH4/O2/N2 mixture and NO emission is analyzed. The results show that LBV is positively correlated with T, α and Ω, and negatively correlated with pages Markstein length (Lb) does not change significantly with T, but increases with α and decreases with p and Ω. Both oxygen enrichment and methane blending significantly increase the hydrodynamic instability of the flame and decrease the buoyancy instability of the flame. Oxygen enrichment and methane blending have little effect on the thermal diffusion instability of the flame. Oxygen enrichment and methane blending are effective in increasing the generation of NHi, O, H, OH, and other radicals and the chemical reaction rate. The main factor of oxygen enrichment and methane blending to increase LBV is the thermal effect, but it also leads to the increase of NO, which is mainly thermal NO. The reaction path and sensitivity analysis of NO show that HNO + H <=> NO + H2, N + NO <=> N2 + O play an important role in the production and consumption of NO, respectively. With the change of Ω and α, the concentration of NO increases and the time of NO production decreases

Notes:

Vendor supplied data

Publisher Number:

2025-32-0060

Access Restriction:

Restricted for use by site license