| The Effect of Self-Generated HHO on Diesel Engine Fuel Efficiency |
| S. D. Rasika Perera |
| Department of Mechanical Engineering, The Open University of Sri Lanka, OUSL, Nawala, Nugegoda, Colombo, 10250, Sri Lanka |
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Received: December 18, 2024; Revised: February 11, 2025 Accepted: February 24, 2025. Published online: March 25, 2025. |
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| ABSTRACT |
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The addition of HHO on the brake thermal efficiency and the specific fuel consumption was analyzed. The laminar flame speed for hydrogen is almost five times higher than that for most hydrocarbon fuels. Better homogeneity of the combustible mixture would provide better conditions for the complete combustion process. In addition, faster combustion becomes closer to constant volume causing an increase in the indicated efficiency. The analysis revealed that adding self-generated HHO affects the engine performance. The effect can be positive or negative depending on the operating condition of the engine. The reason for the high BTE is attributed to increase in heat release rate and improvement of the overall thermodynamic efficiency of the engine when mixed with hydrogen. A specific operating region of the engine where HHO could affect was identified. |
| Key Words:
Hydrogen energy · Brake thermal efficiency · Specific fuel consumption · Compression ignition |
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Corresponding Author.
S. D. Rasika Perera , Email. 
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