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Research Papers: Fuel Combustion

Study on Knock Characteristics of Dimethyl Ether Fueled Homogenous Charge Compression Ignition-Direct Injection Combustion Engines

[+] Author and Article Information
Junxing Hou

School of Mechatronics Engineering,
Zhengzhou Institute of Aeronautical
Industry Management,
Zhengzhou 450015, China
e-mail: houjunxing@126.com

Zhenhua Wen

School of Mechatronics Engineering,
Zhengzhou Institute of Aeronautical
Industry Management,
Zhengzhou 450015, China
e-mail: levinzhwen@126.com

Jianwei Liu

School of Mechatronics Engineering,
Zhengzhou Institute of Aeronautical
Industry Management,
Zhengzhou 450015, China
e-mail: cnhnlyljw@163.com

Zhiqiang Jiang

School of Mechatronics Engineering,
Zhengzhou Institute of Aeronautical
Industry Management,
Zhengzhou 450015, China
e-mail: newroom@126.com

1Corresponding author.

Contributed by the Internal Combustion Engine Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received November 28, 2014; final manuscript received May 18, 2015; published online June 16, 2015. Assoc. Editor: Stephen A. Ciatti.

J. Energy Resour. Technol 137(6), 062202 (Nov 01, 2015) (8 pages) Paper No: JERT-14-1389; doi: 10.1115/1.4030726 History: Received November 28, 2014; Revised May 18, 2015; Online June 16, 2015

A two-cylinder diesel engine was modified for a dimethyl ether (DME) homogeneous charge compression ignition (HCCI)-direct injection (DI) engine. Knock characteristics are investigated based on in-cylinder pressure signals. The in-cylinder pressure is decomposed into four levels using discrete wavelet transform (DWT). The maximum pressure amplitudes and wavelet energy at four levels are approximately equal in normal combustion. With knock, both the maximum pressure amplitude and wavelet energy at the third level are the greatest. The correlation analysis shows that the correlation coefficients for maximum pressure amplitude and wavelet energy are quite valid for the second and third levels. It indicates that the correlation is stronger at frequencies which belong to resonant frequencies. The wavelet energy has slightly better performance than maximum pressure amplitude for identification of knock.

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References

Figures

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Fig. 1

Experimental apparatus

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Fig. 2

Wavelet decomposition

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Fig. 3

(a) In-cylinder pressure and heat release rate, (b) pressure rise rate, and (c) in-cylinder temperature with no knock and knock 0.32 MPa BMEP

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Fig. 4

Wavelet reconstruction of in-cylinder pressure with no knock at 0.32 MPa BMEP

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Fig. 5

Wavelet reconstruction of in-cylinder pressure with knock at 0.32 MPa BMEP

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Fig. 6

The wavelet detail energy EDj with no knock and knock at 0.32 MPa BMEP

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Fig. 7

Correlation of MAPO versus (a) PD1, (b) PD2, (c) PD3, and (d) PD4 with knock

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Fig. 8

Correlation of MAPO versus (a) E1, (b) E2, (c) E3, and (d) E4 with knock

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Fig. 9

Correlation of MPRR versus (a) PD1, (b) PD2, (c) PD3, and (d) PD4 with knock

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Fig. 10

Correlation of MPRR versus (a) E1, (b) E2, (c) E3, and (d) E4 with knock

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