Combustion and Combustion Diagnostic Techniques

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Energy Science and Technology".

Deadline for manuscript submissions: closed (31 March 2023) | Viewed by 4483

Special Issue Editors

School of Mechanical Engneering, Shanghai Jiao Tong University, Shanghai 200240, China
Interests: laser combustion diagnostics and molecular spectroscopy; aeroengine combustion and combustion instability
State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Interests: turbulent combustion; combustion laser diagnostics; laminar/turbulent flame dynamics; alternative fuel and clean combustion

Special Issue Information

Dear Colleagues,

The vision for sustainable world and a carbon neutral future would be illusory without the current combustion technology to have a fundamental shift into a low carbon energy source. Traditional hydrocarbon combustion technology is also evolving rapidly to meet various challenge to our society.

These new combustion technologies have an increasing requirement of combustion diagnostic technology to provide temperature, species concentration, and velocity fields in the harsh combustion environment, together with combustion information, such as spray, heat release rate, scalar dissipation rate, local equivalence ratio, and reaction progress variable. The combustion diagnostic technologies, including spectroscopic measurement and imaging of the absorption, emission, and scattering interaction between combustion field and light source, are undergoing rapid development from qualitative to quantitative interpretation and from time-averaged measurement to instantaneous and time-resolved measurement, which are often based on lasers to provide the temporal and spacial requirements. Various new techniques, such as sensor development, artificial intelligence, and image analysis, are also crucial for the new development.

In this Special Issue, we invite submissions exploring cutting-edge research and recent advances in a wide field of combustion and combustion diagnostic techniques, from turbulent flame, swirl flame, spray flame, Mild combustion, catalytic combustion, e-fuel, and other advanced combustion techniques.

Both theoretical and experimental studies are welcome, as well as short communications and reviews.

Dr. Xunchen Liu
Prof. Dr. Jinhua Wang
Guest Editors

Manuscript Submission Information

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Published Papers (2 papers)

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Research

12 pages, 4319 KiB  
Article
Experimental Study on the Effects of Hydrogen Injection Strategy on the Combustion and Emissions of a Hydrogen/Gasoline Dual Fuel SI Engine under Lean Burn Condition
by Shiyi Pan, Jinhua Wang, Bin Liang, Hao Duan and Zuohua Huang
Appl. Sci. 2022, 12(20), 10549; https://0-doi-org.brum.beds.ac.uk/10.3390/app122010549 - 19 Oct 2022
Cited by 1 | Viewed by 2503
Abstract
Hydrogen addition can improve the performance and extend the lean burn limit of gasoline engines. Different hydrogen injection strategies lead to different types of hydrogen mixture distribution (HMD), which affects the engine performance. Therefore, the present study experimentally investigated the effects of hydrogen [...] Read more.
Hydrogen addition can improve the performance and extend the lean burn limit of gasoline engines. Different hydrogen injection strategies lead to different types of hydrogen mixture distribution (HMD), which affects the engine performance. Therefore, the present study experimentally investigated the effects of hydrogen injection strategy on the combustion and emissions of a hydrogen/gasoline dual-fuel port-injection engine under lean-burn conditions. Four different hydrogen injection strategies were explored: hydrogen direct injection (HDI), forming a stratified hydrogen mixture distribution (SHMD); hydrogen intake port injection, forming a premixed hydrogen mixture distribution (PHMD); split hydrogen direct injection (SHDI), forming a partially premixed hydrogen mixture distribution (PPHMD); and no hydrogen addition (NHMD). The results showed that 20% hydrogen addition could extend the lean burn limit from 1.5 to 2.8. With the increase in the excess air ratio, the optimum HMD changed from PPHMD to SHMD. The maximum brake thermal efficiency was obtained with an excess air ratio of 1.5 with PPHMD. The coefficient of variation (COV) with NHMD was higher than that with hydrogen addition, since the hydrogen enhanced the stability of ignition and combustion. The engine presented the lowest emissions with PHMD. There were almost no carbon monoxide (CO) and nitrogen oxides (NOx) emissions when the excess air ratio was, respectively, more than 1.4 and 2.0. Full article
(This article belongs to the Special Issue Combustion and Combustion Diagnostic Techniques)
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15 pages, 5796 KiB  
Article
Experimental Study on Transient Ignition Characteristics of Acoustic Excited Methane Jet Diffusion Flames
by Peng Zhu, Qian Wang, Deng Pan, Tong Zhu and Chenzhen Ji
Appl. Sci. 2022, 12(19), 9719; https://0-doi-org.brum.beds.ac.uk/10.3390/app12199719 - 27 Sep 2022
Cited by 3 | Viewed by 1255
Abstract
The ignition process of fuel plays an important role in the flame development and emission characteristics, which has attracted intensive attention in the combustion field. However, the transient ignition process for jet flames under acoustic excitation is rarely reported. In the current study, [...] Read more.
The ignition process of fuel plays an important role in the flame development and emission characteristics, which has attracted intensive attention in the combustion field. However, the transient ignition process for jet flames under acoustic excitation is rarely reported. In the current study, the effect of external acoustic excitation with different frequencies on the ignition process of methane jet diffusion flames has been studied experimentally using high-speed color and schlieren imaging systems. The fuel nozzle used in the experiment features a concentric ring structure, with fuel in the middle and air around it. The acoustic excitation was added to the air side through the loudspeaker, and the frequency of the acoustic excitation was set as 10 Hz, 30 Hz, 50 Hz and 100 Hz, respectively, while a case without external excitation was used as the control group. It is found that the periodic vortex structure propagates downstream in the flow field after acoustic excitation is added, which leads to an uneven velocity distribution in the flow field and the appearance of a local high-speed zone. The acoustic excitation of 30 Hz and 50 Hz can reduce the probability of successful ignition, which is mainly because the acoustic wave propagates in the flow field and causes drastic velocity changes near the ignition position. For the case of 100 Hz, the acoustic perturbation is confined in a small region near the nozzle exit, while the flow field velocity is slightly higher than the case without acoustic excitation. Full article
(This article belongs to the Special Issue Combustion and Combustion Diagnostic Techniques)
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