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High proportion of biofuel replacement for conventional diesel using safflower biodiesel and diethyl ether blends in a CNG-powered RCCI operation of a diesel engine

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  • Ülgen, Ali İhsan
  • Çelebi, Yahya
  • Aydın, Hüseyin

Abstract

Reactivity-controlled compression ignition operation was used for this experimental work. In the study, biodiesel derived from safflower was blended with diethyl ether at concentrations of 5 %, 10 %, and 15 % and utilized as the primary fuel while compressed natural gas was used as the low-reactivity fuel, injected inside the intake manifold with a substitution rate of 50 %. The study focused on the influence of high-percentage biofuel on compressed natural gas-powered reactivity-controlled compression ignition operation. The engine was held under the same engine speed of 1500 rpm and the engine load of 7.2 kW. The test results obtained from the experiments showed an increase in brake thermal efficiency, brake specific fuel consumption, and brake specific energy consumption, while exhaust gas temperature was decreased. There was an average reduction of 61.36 % and 20.7 % in nitrogen oxides and carbon dioxide, respectively. On contrary, a remarkable increase was observed in carbon oxide by 22.9 % and hydrocarbons emissions by 33.1 % on average compared to petrodiesel with exception for the blend of biodiesel with high content of diethyl ether which showed a significant reduction of 83.3 % on hydrocarbons. The combustion parameters for alternate fuel modes quite similar to diesel fuel combustion.

Suggested Citation

  • Ülgen, Ali İhsan & Çelebi, Yahya & Aydın, Hüseyin, 2025. "High proportion of biofuel replacement for conventional diesel using safflower biodiesel and diethyl ether blends in a CNG-powered RCCI operation of a diesel engine," Renewable Energy, Elsevier, vol. 246(C).
    • Handle: RePEc:eee:renene:v:246:y:2025:i:c:s0960148125005816
    DOI: 10.1016/j.renene.2025.122919
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    References listed on IDEAS

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