Experimental and numerical study on auto-ignition characteristics of the PODE-diesel blends (PDF)
Release Time:2025-04-30
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- Date:
- 2025-04-30
- Title of Paper:
- Experimental and numerical study on auto-ignition characteristics of the PODE-diesel blends (PDF)
- Journal:
- Energy Fuels
- Summary:
- A modified cooperative fuel research (CFR) octane rating engine and a constant-volume combustion chamber (CID510) were adopted to investigate the effect of the addition of Polyoxymethylene dimethyl ether (PODE) on the ignition characteristics of diesel fuels. PODE was blended in diesel fuel with volume fraction from 0% to 30%. The ignition delay times of PODE/diesel blends were obtained on constant-volume combustion chamber at a temperature of 833 K~893 K and a reduction of environmental oxygen (O2) content range from 21% to 12.8%. With PODE addition, the ignition delay time decreases, while the onset of low-temperature heat release (LTHR) moves forward and the peak of LTHR increases. The blends with higher PODE fraction can weaken the negative effect on ignition delay caused by the reduction of oxygen content in air. Critical compression ratio (CCR) and apparent heat release rate of binary blends were measured on the CFR engine at an equivalence ratio of 0.5 under HCCI combustion mode. The CCR becomes lower with higher PODE content in the blend. All blends exhibited two-stage ignition. The blends with higher PODE fraction give a higher percentage of LTHR. Numerical simulation reveals that decomposition of PODE produces more CH2O, which accelerates the low-temperature reaction. The reactions related to O and O2 are enhanced by oxygen available in PODE, which along with the molecular structure of PODE, results in higher reactivity for the PODE/diesel binary blends.
- Co-author:
- Meng X, Hu EJ, Yoo KH, Boehman AL, Huang ZH
- Volume:
- 2019, 33(3): 2538-2546
- Page Number:
- 2538-2546
- Translation or Not:
- No
- Date of Publication:
- 2019-03-21