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Analyzing characteristics of knock in a hydrogen-fueled Wankel rotary engine

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  • Meng, Hao
  • Ji, Changwei
  • Su, Teng
  • Yang, Jinxin
  • Chang, Ke
  • Xin, Gu
  • Wang, Shuofeng

Abstract

Hydrogen-fueled Wankel rotary engine (HWRE) as a promising power device overcomes some of the drawbacks of the hydrogen-fueled reciprocating engine. However, its elongated combustion chamber makes it prone to knock, and little research has been done in this area. Hence, to understand the knock characteristics of HWRE, the present work focus on parameters of HWRE knock at 2000r/min, an excess air ratio of 1.2 and an ignition timing of −7°CA ATDC. The main results are as follows: As with knock intensity, knock duration and maximum pressure rising rate also can characterize the knock of HWRE because of the logarithmic or linear relationship among three parameters. For the knock intensity, two parameters are needed to precisely characterize the HWRE knock, while only one parameter is needed for the knock duration and the maximum pressure rising rate. Considering the computing cost, the maximum pressure rising rate is better than others. The knock intensity has a significant influence on the timed sequence of peak knock pressure and peak in-cylinder pressure. Besides, the mechanism of backfire caused by the knock of HWRE is different from that of the hydrogen-fueled reciprocating piston engine, which results from the inter-cylinder flame leakage.

Suggested Citation

  • Meng, Hao & Ji, Changwei & Su, Teng & Yang, Jinxin & Chang, Ke & Xin, Gu & Wang, Shuofeng, 2022. "Analyzing characteristics of knock in a hydrogen-fueled Wankel rotary engine," Energy, Elsevier, vol. 250(C).
    • Handle: RePEc:eee:energy:v:250:y:2022:i:c:s0360544222007319
    DOI: 10.1016/j.energy.2022.123828
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    1. Jiao, Huichao & Ye, Xianlei & Zou, Run & Wang, Nana & Liu, Jinxiang, 2022. "Comparative study on ignition and combustion between conventional spark-ignition method and near-wall surface ignition method for small-scale Wankel rotary engine," Energy, Elsevier, vol. 255(C).
    2. Tehseen Johar & Chiu-Fan Hsieh, 2023. "Design Challenges in Hydrogen-Fueled Rotary Engine—A Review," Energies, MDPI, vol. 16(2), pages 1-22, January.
    3. Meng, Hao & Ji, Changwei & Shen, Jianpu & Yang, Jinxin & Xin, Gu & Chang, Ke & Wang, Shuofeng, 2023. "Analysis of combustion characteristics under cooled EGR in the hydrogen-fueled Wankel rotary engine," Energy, Elsevier, vol. 263(PB).
    4. Huang, Junfeng & Gao, Jianbing & Wang, Yufeng & Yang, Ce & Ma, Chaochen & Tian, Guohong, 2023. "Effect of asymmetric fuel injection on combustion characteristics and NOx emissions of a hydrogen opposed rotary piston engine," Energy, Elsevier, vol. 262(PB).
    5. Zeng, Yonghao & Fan, Baowei & Pan, Jianfeng & He, Ren & Fang, Jia & Salami, Hammed Adeniyi & Wu, Xin, 2022. "Research on the ignition strategy of a methanol/gasoline blends rotary engine using turbulent jet ignition mode," Energy, Elsevier, vol. 261(PA).
    6. Meng, Hao & Ji, Changwei & Yang, Jinxin & Chang, Ke & Xin, Gu & Wang, Shuofeng, 2022. "Experimental understanding of the relationship between combustion/flow/flame velocity and knock in a hydrogen-fueled Wankel rotary engine," Energy, Elsevier, vol. 258(C).
    7. Zhai, Yifan & Wang, Shuofeng & Wang, Zhe & Zhang, Tianyue & Ji, Changwei, 2023. "Experimental and numerical study on laminar combustion characteristics of by-product hydrogen coke oven gas," Energy, Elsevier, vol. 278(C).

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