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http://dx.doi.org/10.7842/kigas.2018.22.2.59

Characteristics of Combustion by Varying Different Coolant-temperature in a Hydrogen Engine for HALE UAV  

Yi, Ui-Hyung (Dept. of Engine Research, Korea Institute of Machinery and Materials)
Jang, Hyeong-Jun (Dept. of Engine Research, Korea Institute of Machinery and Materials)
Park, Cheol-Woong (Dept. of Engine Research, Korea Institute of Machinery and Materials)
Kim, Yong-Rae (Dept. of Engine Research, Korea Institute of Machinery and Materials)
Choi, Young (Dept. of Engine Research, Korea Institute of Machinery and Materials)
Publication Information
Journal of the Korean Institute of Gas / v.22, no.2, 2018 , pp. 59-66 More about this Journal
Abstract
Using hydrogen fuel is expected to be suitable as a reciprocating internal combustion engine with heightened interest in HALE(High Altitude Long Endurance) UAV(Unmanned Aerial Vehicle). Hydrogen is hightest energy density per mass so it can continue to charge for long periods of time and have positive part of the environmental effects. However, it is estimated that there is less research on hydrogen fuel engine currently applied, and many studies need to be done. Depending on the operation, there are factors that result in supercooling due to reduced radiation or reduce cooling performance due to low air density. Therefore, the experiment was to change the temperature of the cooling water and investigate the effect on engine combustions. The limitation of the stable operation range due to backfire is dominated by the excess air ratio rather than the effect of the cooling water temperature change. When the cooling water temperature increases, the volumetric efficiency decreases and the torque decreases. As the cooling water temperature decreases, the heat loss was increased and consequently the thermal efficiency was decreased.
Keywords
UAV; Hydrogen; Spark ignition engine; Backfire; Air excess ratio; Coolant temperature;
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