| EFFECT OF EXCESSIVE AIR RATIO ON HYDROGEN-FUELED SPARK
IGNITION ENGINE WITH HIGH COMPRESSION RATIO USING DIRECT
INJECTION SYSTEM TOWARD HIGHER BRAKE POWER AND
THERMAL EFFICIENCY |
| Yongrae Kim 1, Cheolwoong Park 1, Junho Oh 2, Sechul Oh 1, Young Choi 1, Jeongwoo Lee 2 |
1Engine Research Department, Environmental and Energy Research Division, Korea Institute of Machinery and Materials
2Advanced Transportation Machinery Research Center & Division of Mechanical System Engineering, Jeonbuk National University |
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| ABSTRACT |
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Hydrogen is advantageous for use in internal combustion engines (ICEs) because of its high laminar flame
speed and carbon-neutral characteristics. However, because of its low minimum ignition energy, abnormal combustions such
as back-fire, pre-ignition, and knocking hinder its efficient supply as a fuel to ICEs under near stoichiometric conditions.
Hence, in this study, the effect of various excessive air ratios (λ) on the performance of a hydrogen-fueled spark ignition
engine using port fuel injection (PFI) was evaluated under wide-open throttle conditions. After determining the highest limit
for the maximum brake torque, a hydrogen direct injection (DI) system was applied under the same λ and abnormal
combustion limits to improve the brake power (BP). Results show that at 1,500 rpm, a maximum BP of 14.7 kW was
achieved under a λ value of 1.4 with PFI; however, it can be increased up to 21.1 kW using DI with the same brake thermal
efficiency under a compression ratio of 14. |
| Key Words:
Brake power, Direct injection (DI), Excessive air ratio (λ), Hydrogen, Nitrogen oxides (NOX), Port fuel
injection (PFI) |
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Corresponding Author.
Jeongwoo Lee , Email. 
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