Article
Energy & Fuels
Hao Meng, Changwei Ji, Shuofeng Wang, Du Wang, Jinxin Yang
Summary: This study aimed to improve the idle performance of the n-butanol rotary engine by blending hydrogen and reducing idle speed. Results showed that hydrogen could enhance engine stability and economy, as well as effectively reduce CO and HC emissions. In addition, hydrogen enrichment could compensate for the negative effects of reducing idle speed on combustion and emissions.
Article
Energy & Fuels
Hao Meng, Changwei Ji, Gu Xin, Jinxin Yang, Ke Chang, Shuofeng Wang
Summary: This study provides a comprehensive analysis of the hydrogen-fueled Wankel rotary engine (HWRE), comparing it with hydrogen-fueled reciprocating piston engines (HRPE) and gasoline conditions. The results show that HWRE has a higher power per displacement, but slightly lower brake thermal efficiency and higher NO emissions. Additionally, abnormal combustion characteristics and mechanisms differ between HWRE and HRPE.
Article
Energy & Fuels
Yuanqi Bai, Ying Wang, Lei Hao
Summary: This study investigated the combustion and emission characteristics of a dual-fuel direct injection system using n-butanol and diesel. The results showed that stable and high-efficient combustion could be achieved in n-butanol/diesel DFDI mode, with an increase in indicated thermal efficiency and a decrease in nitrogen oxide and soot emissions.
Article
Chemistry, Physical
Jianbing Gao, Guohong Tian, Chaochen Ma, Yuanjian Zhang, Shikai Xing, Phil Jenner
Summary: Lean-burn was adopted as an effective method in this study to reduce NOx emissions from hydrogen combustion in ORP engines. The equivalence ratio has a significant impact on combustion and NOx emission characteristics, with effects varying with engine speeds. High NOx emissions were observed under low engine speed conditions due to hydrogen combustion near stoichiometric ratio.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Decheng Li, Haoyu Wang, Xiumin Yu, Hang Yang
Summary: The combination of ABE and hydrogen can improve the combustion efficiency and emissions of the engine. However, it should be noted that a higher blending ratio of hydrogen may not necessarily lead to further improvements.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Qixin Ma, Quanchang Zhang, Zheng Chen, Jichao Liang
Summary: This study investigated the combustion and emission performance of a Euro-VI heavy-duty diesel engine under different coolant temperature and n-butanol addition. The results indicate that coolant temperature has little effect on exhaust energy flow, while increasing n-butanol proportion can enhance coolant energy and reduce energy loss.
Article
Energy & Fuels
Wanchen Sun, Yi Sun, Liang Guo, Hao Zhang, Yuying Yan, Wenpeng Zeng, Shaodian Lin
Summary: CTL/n-butanol blends improve fuel-gas mixture distribution and increase premixed combustion ratio in the cylinder. Furthermore, through synergistic control of n-butanol addition and EGR, the tradeoff relationship between NOx and particles is mitigated.
Article
Green & Sustainable Science & Technology
Weiwei Shang, Xiumin Yu, Kehao Miao, Zezhou Guo, Huiying Liu, Xiaoxue Xing
Summary: Using n-butanol as an alternative fuel can effectively solve the problems of fossil resource depletion and environmental pollution. This study investigated the combustion and emission performance of n-butanol engines under different direct injection ratios and excess air ratios. The results showed that a direct injection ratio of 20% achieved the best combustion performance, and HC emissions were lowest at a direct injection ratio of 40-60%.
Article
Green & Sustainable Science & Technology
Mutlu Okcu, Yasin Varol, Sehmus Altun, Mujdat Firat
Summary: The study investigated the impact of using low reactivity fuel IBE in an RCCI engine and found the optimal premixed ratio for combustion characteristics and NOx emissions under different loads.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Green & Sustainable Science & Technology
Cristian Sandu, Constantin Pana, Niculae Negurescu, Gheorghe Lazaroiu, Alexandru Cernat, Rares Georgescu, Cristian Nutu
Summary: This paper analyzes the influence of butanol content in gasoline blends on engine operation, focusing on operation stability, thermal efficiency and emissions. The study finds that butanol can improve engine operation stability and energy performance, while reducing pollutant emissions.
Article
Chemistry, Physical
Jinxin Yang, Changwei Ji, Shuofeng Wang, Hao Meng
Summary: This study investigated the effect of ignition timing on a hydrogen-fueled Wankel rotary engine under low speed, part load, and lean combustion conditions, highlighting the importance of selecting the appropriate ignition timing for engine performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Energy & Fuels
Xiaoyu Cong, Changwei Ji, Shuofeng Wang
Summary: The study found that blending DME can extend flame development and propagation periods, increase power output of the neat hydrogen engine, and reduce nitrogen oxides emissions. However, blending DME may increase cyclic variation due to weakened flame kernel and propagation process, but emissions can be controlled by adjusting the DME fraction.
Article
Energy & Fuels
Luis Tipanluisa, Natalia Fonseca, Jesus Casanova, Jose-Maria Lopez
Summary: This study investigates the effects of different n-butanol/diesel fuel blends on a Euro V heavy-duty diesel engine's performance and emissions. The results show that using n-butanol can improve engine performance and reduce particulate emissions in most operating conditions, while increasing CO emissions. The study also indicates that THC emissions increase with n-butanol content, while NO2 emissions decrease.
Article
Thermodynamics
Xiaorong Deng, Jing Li, Yifei Liang, Wenming Yang
Summary: This study investigates the combustion and emissions characteristics of dual-fuel engines using n-butanol, n-octanol, and di-n-butyl ether (DNBE) as fuels. The results show that increasing the n-butanol content leads to higher peak pressure and CO emissions, as well as shorter combustion duration. Compared to n-butanol/n-octanol engines, n-butanol/DNBE engines exhibit shorter ignition delay, lower maximum pressure rise rate, longer diffusion combustion phase, higher indicated thermal efficiency, and slightly higher NOx emissions.
Article
Thermodynamics
Sheng Gao, Yanhui Zhang, Zhiqing Zhang, Dongli Tan, Junming Li, Zibin Yin, Jingyi Hu, Ziheng Zhao
Summary: This study investigated the performance and emission characteristics of diesel engines operating in highland areas. Through the use of response surface methodology and artificial neural networks, the emissions were predicted for different combustion chamber geometries. The predictions were then optimized using a non-dominated sorting genetic algorithm to obtain the optimal solutions.