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3차원 연소장에서의 베타 형태의 스털링엔진 고온 열교환기 설계를 위한 수치해석 연구
강석훈(S.H. Kang),김혁주(H.J. Kim),정대헌(D.H. Chung) 한국전산유체공학회 2011 한국전산유체공학회지 Vol.16 No.2
Numerical study is conducted to design the high temperature heat exchanger of Stirling engine by using the commercial CFD solver, FLUENT. The Fin-tube type of heat exchanger is designed as a reference model by considering the type of engine which is β-configuration. To .find the optimal design of heat exchanger in heat transfer capacity numerical calculation is conducted by changing the shape, the number, and material of reference model in three-dimensional combustion field. Adjusted one-way constant velocity of working fluid that is helium is considered as the representative velocity of oscillating flow. The optimal design of heat exchanger considering the heat transfer capability is suggested by using the calculation results.
탈질공정을 갖는 가스엔진 열병합발전시스템 배기가스 환원분위기 조성용 후연소버너 최적화 연구
최재준(J. J. Choi),김혁주(H. J. Kim),박화춘(H. C. Park),정대헌(D. H. Chung),박병식(B. S. Park),송대섭(D. S. Song),유성연(S. Y. Yoo) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The instable oil price makes seek the more efficient energy machine and energy system. CHP(combined heat and power) system is the most favorable alternative choice among the energy saving systems but the severe emission regulation for the CHP system is an another challenge thing. Because of the need for the Ultra Low NOx CHP system, the efforts for reducing the toxic emission including NOx and CO are continuously investigated. The cogeneration hybrid system was developed by the need for the low NOx CHP system at the previous work, but the huge amount of the total fuel considering conventional CHP system, the after-burner which is a component of the cogeneration hybrid system was optimized to minimize the fuel consumption. In this experiment, the after-burner was re-optimized by the fuel supply minimization and engine exhaust gas-fuel flow distribution optimization. All the condition was optimized and adjusted to meet the exhaust gas condition, below 1% O₂ amount and 300-2000ppm CO. The optimized cogeneration hybrid system can meet the current NOx level and exhaust gas regulation and it will achieve the clean combustion gas and efficient cogeneration system.