The 18th edition of Computing+ Seminar was held on 4 Nov, 2023. Professor Ping Wang from Jiangsu University gave a lecture on “Experimental Study and Large Eddy Simulation(LES) on Combustion of Turbulent Rotating Ammonia Flame”. The seminar was chaired by Professor Kun Luo, Deputy Director of Shanghai Institute for Advanced Study, Zhejiang University, and Deputy Director of College of Energy Engineering, and researchers from Zhejiang University, Jiangsu University etc participated in the seminar both on site and online.
As a zero-carbon fuel, NH3 is not only a carrier for hydrogen energy, but also a promising source for green energy. However, in combustion, ammonia features low reactivity and high NOX emission. Professor Ping Wang introduced in detail the series of combustion experiments and LES carried out by his team in recent years on turbulent NH3 flame. He firstly presented the results on turbulent rotary premixed combustion of NH3-CH4 in a single-stage combustor, keeping the volume of ammonia in the gas at 60%, and varying the equivalence ratios ϕ (0.7, 0.85, 1.0, 1.15, and 1.3) in order to investigate how ϕ effect characteristics of the flow field and NO emission. It was shown that the temperature and NO emission in combustion field first increased and then decreased with the increase of ϕ, and the highest temperature occurred at ϕ = 1.0, while the highest NO emission occurred when ϕ=0.85. The NO emission was lower under rich condition, but there was unburned H2 at the outlet; at ϕ = 1.3, unburned NH3 was found and experimental NO emission results was consistent with LES. Professor Wang further introduced self-designed staged burner, illustrating the primary and secondary flames were stable when air was staged. The primary flame was rich premixed flame, while the secondary one displayed hydrogen-air diffusion pattern, which was different from the expected Rich-Quench-Lean(RQL) combustion, and therefore optimization of the design was needed.
The audiences echoed with Professor Wang’s work, and interacted with him during Q&A session. Professor Wang patiently answered all questions including direct moment closure (DMC) and Dynamic Thickened Flame(DTF) modeling and engaged in an intense discussion with audiences onsite and online. The seminar was a success and continues the tradition of the Computing+ series.
About “Computing+” Seminar
The revolution characterized by intelligent computing has continued to drive the pervasive application of algorithms and computing power to information, life, and physical sciences, accelerating the construction of a joint world of human, physical world, intelligent machine and digital information science.
In this light, Shanghai Institute for Advanced Study, Zhejiang University launched 'Computing+' seminar series, inviting academics to share latest developments and exchange ideas and thoughts to further explore the intersections of computing with life sciences, engineering and social sciences.