Start and Idle Combustion Characteristics of Hydrogen Engine for the HALE UAV

고고도 무인기용 수소 엔진의 시동성 및 공회전 연소 특성

Kim, Yong-Rae;Choi, Young;Lee, Janghee

  • Received : 2015.12.04
  • Accepted : 2015.12.24
  • Published : 2015.12.31


Hydrogen features highest energy density per mass and is expected to be desirable as a fuel of HALE(High altitude long endurance) UAV(Unmanned aerial vehicle). A reciprocating internal combustion engine is known to be a reliable and economic power source for this kind of UAV. Therefore, the combination of hydrogen and engine is worth of doing research. Test bench with 2.4L Spark-Ignited engine was prepared for the experiment in which start and combustion characteristics at idle condition were examined in this study. Stable hydrogen supply system and a universal ECU(Engine control unit) were also utilized for the test engine. Equivalence ratio and spark timings at idle operation were investigated and compared to the data of gasoline engine. The results will be a starting point for full-scale research of hydrogen engine for HALE UAV.


hydrogen;spark ignition engine;idle;start;combustion


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  1. Development of Test Stand for Altitude Test of Reciprocating Engine vol.22, pp.3, 2018,


Supported by : 한국항공우주연구원, 한국기계연구원