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Experimental study for the effect of spark ignition on methanol/PODE dual fuel combustion under medium and low loads

Author

Listed:
  • Wang, Yaodong
  • Su, Yan
  • Li, Xiaoping
  • Wang, Yongzhen
  • Yang, Tong
  • Wang, Bo
  • Sun, Yao

Abstract

Methanol/high reactivity fuel (HRF) dual fuel combustion cannot further extend methanol energy ratio (MER) at medium and low loads. Polyoxymethylene dimethyl ether (PODE) as a biofuel with high cetane number is well suited for HRF. This paper explored the effect of spark ignition (SI) on energy conversion and MER extension for methanol/PODE under medium and low loads. The results show that SI triggers the exothermic processes of SI and dual fuel spark-assisted compression ignition (D-SACI). SI raised MER from 30 %, 40 %, 46 % to 40 %, 60 %, 90 % for brake mean effective pressure (BMEP) of 0.2, 0.4, 0.6 MPa, respectively. SI and D-SACI combustion can partially or completely replace premixed compression ignition (CI). Diffusion combustion and one or more exothermic processes of SI, D-SACI and premixed CI make up two-stage or three-stage exotherm. D-SACI is easily triggered when spark timing approaches PODE injection timing, otherwise, SI exotherm is easily triggered; at BMEP of 0.6 MPa, the exothermic energy of premixed CI is gradually converted into the exothermic energy of D-SACI and SI as MER increases. By optimizing, maximum brake thermal efficiency for BMEP of 0.4 and 0.6 MPa are 37.75 % and 42.82 %, respectively, corresponding to the MER of 50 % and 80 %, respectively.

Suggested Citation

  • Wang, Yaodong & Su, Yan & Li, Xiaoping & Wang, Yongzhen & Yang, Tong & Wang, Bo & Sun, Yao, 2024. "Experimental study for the effect of spark ignition on methanol/PODE dual fuel combustion under medium and low loads," Energy, Elsevier, vol. 301(C).
  • Handle: RePEc:eee:energy:v:301:y:2024:i:c:s0360544224014786
    DOI: 10.1016/j.energy.2024.131705
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