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Characterization of knocking combustion in HCCI DME engine using wavelet packet transform

Author

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  • Hou, Junxing
  • Qiao, Xinqi
  • Wang, Zhen
  • Liu, Wei
  • Huang, Zhen

Abstract

A diesel engine is modified for homogeneous charge compression ignition (HCCI) combustion with dimethyl ether. With and without knock, in-cylinder pressure is acquired, and in-cylinder temperature, rate of heat release (ROHR), pressure rise rate and pressure rise acceleration obtained. Wavelet packet transform is performed to decompose pressure signal into three layers with subsignals obtained. Three wavelet packet quantifiers for seven subsignals, including mean absolute value of coefficients, wavelet packet energy and entropy, are compared. The three quantifiers are correlated with maximum pressure rise rate and pressure rise acceleration, respectively. The analysis shows that the in-cylinder pressure, temperature and ROHR change smoothly in normal combustion. When combustion gets into knock, they have a steep rise and a strong fluctuation; the ROHR peaks increase for both cool flame and hot flame, and heat release advances, especially for hot flame. The pressure rise rate and pressure rise acceleration fluctuate more violently, and their maximums increase remarkably and advance somewhat. Without knock, mean absolute value of coefficients, wavelet packet energy and entropy for the subsignal 1 are much greater than others. As knock occurs, three wavelet packet quantifiers for seven subsignals increase greatly, and for the subsignal 6 becomes the largest. Wavelet packet quantifiers for seven subsignals should be monitored for knock detection. The correlation coefficient similarly increases first, decreases afterwards and increases again through seven subsignals. Among three wavelet packet quantifiers, mean absolute value of coefficients has the maximum correlation coefficient except for the subsignal 6. Its maximum correlation coefficient appears at subsignal 7, whose frequency band is 8.75-10Â kHz.

Suggested Citation

  • Hou, Junxing & Qiao, Xinqi & Wang, Zhen & Liu, Wei & Huang, Zhen, 2010. "Characterization of knocking combustion in HCCI DME engine using wavelet packet transform," Applied Energy, Elsevier, vol. 87(4), pages 1239-1246, April.
    • Handle: RePEc:eee:appene:v:87:y:2010:i:4:p:1239-1246
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    References listed on IDEAS

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    2. Maurya, Rakesh Kumar & Agarwal, Avinash Kumar, 2011. "Experimental investigation on the effect of intake air temperature and air-fuel ratio on cycle-to-cycle variations of HCCI combustion and performance parameters," Applied Energy, Elsevier, vol. 88(4), pages 1153-1163, April.
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    4. Gan, Suyin & Ng, Hoon Kiat & Pang, Kar Mun, 2011. "Homogeneous Charge Compression Ignition (HCCI) combustion: Implementation and effects on pollutants in direct injection diesel engines," Applied Energy, Elsevier, vol. 88(3), pages 559-567, March.
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    6. Hairuddin, A. Aziz & Yusaf, Talal & Wandel, Andrew P., 2014. "A review of hydrogen and natural gas addition in diesel HCCI engines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 32(C), pages 739-761.
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    8. Sen, Asok K. & Zheng, Jianjun & Huang, Zuohua, 2011. "Dynamics of cycle-to-cycle variations in a natural gas direct-injection spark-ignition engine," Applied Energy, Elsevier, vol. 88(7), pages 2324-2334, July.
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    10. Najjar, Yousef S.H., 2011. "Comparison of performance of a Greener direct-injection stratified-charge (DISC) engine with a spark-ignition engine using a simplified model," Energy, Elsevier, vol. 36(7), pages 4136-4143.
    11. Maurya, Rakesh Kumar & Agarwal, Avinash Kumar, 2011. "Experimental study of combustion and emission characteristics of ethanol fuelled port injected homogeneous charge compression ignition (HCCI) combustion engine," Applied Energy, Elsevier, vol. 88(4), pages 1169-1180, April.
    12. Sun, Chunhua & Liu, Yu & Qiao, Xinqi & Ju, Dehao & Tang, Qing & Fang, Xiaoyuan & Zhou, Feng, 2020. "Experimental study of effects of exhaust gas recirculation on combustion, performance, and emissions of DME-biodiesel fueled engine," Energy, Elsevier, vol. 197(C).
    13. Xu Zheng & Nan Zhou & Quan Zhou & Yi Qiu & Ruijun Liu & Zhiyong Hao, 2020. "Experimental Investigation on the High-frequency Pressure Oscillation Characteristics of a Combustion Process in a DI Diesel Engine," Energies, MDPI, vol. 13(4), pages 1-25, February.
    14. Gharehghani, Ayat & Abbasi, Hamid Reza & Alizadeh, Pouria, 2021. "Application of machine learning tools for constrained multi-objective optimization of an HCCI engine," Energy, Elsevier, vol. 233(C).
    15. Kang, Yinhu & Wang, Quanhai & Lu, Xiaofeng & Wan, Hu & Ji, Xuanyu & Wang, Hu & Guo, Qiang & Yan, Jin & Zhou, Jinliang, 2015. "Experimental and numerical study on NOx and CO emission characteristics of dimethyl ether/air jet diffusion flame," Applied Energy, Elsevier, vol. 149(C), pages 204-224.
    16. Pachiannan, Tamilselvan & Zhong, Wenjun & Rajkumar, Sundararajan & He, Zhixia & Leng, Xianying & Wang, Qian, 2019. "A literature review of fuel effects on performance and emission characteristics of low-temperature combustion strategies," Applied Energy, Elsevier, vol. 251(C), pages 1-1.
    17. Komninos, N.P. & Kosmadakis, G.M., 2011. "Heat transfer in HCCI multi-zone modeling: Validation of a new wall heat flux correlation under motoring conditions," Applied Energy, Elsevier, vol. 88(5), pages 1635-1648, May.

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