S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Mechanical Aerospace Engineering (기계항공공학부) Others_기계항공공학부
Numerical and Experimental Investigations on a Variable Sonic and Subsonic Ejector
- Namkoung, Hyuck-Joon; Hong, Chang-Oug; Moon, Chong-Hoon; Lee, Kyoung-Hoon; Park, Hyeng-Soon; Kim, Young-Soo; Kim, Chongam
- Issue Date
- 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit
8 - 11 July 2007, Cincinnati, OH
- A numerical and experimental investigation of the sonic and subsonic ejector system has been
conducted to develop a hydrogen recirculation ejector system for fuel cell vehicle. In this study, a new method
to improve the efficiency of a hydrogen fuel cell system in variable operating conditions of the vehicle was
introduced. The ejector has the variable recess length in the distance between a main nozzle exit and a mixing
chamber inlet, so that it can control the secondary mass flow rate by adjusting supply pressure. The results
showed that ejector in the condition of sonic and subsonic could control the recirculation ratio effectively by
changing the supply pressure and position of nozzle.
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