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선체용 압연 강판의 습식 수중 아크 용접부의 부식특성에 관한 연구
황성훈(S. H. Hwang),김창규(C. G. Kim),김민남(M. N. Kim),곽희환(H. H. Kwak) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Underwater wet arc welds were experimentally performed on 11mm thick KR-RA steel plate by using six different types of flux coated electrodes of 4.0mm diameter, KSKR, KSKT, USBL, JPUW, UWEA, and UWEB. As results, In aspect of bead appearance, detachability of slag, spatter producing and arc stability JPUW was the best condition and UWEB obtained more superior weldability than KSKR and KSKT. In bond zone, the hardness distribution of underwater wet multi-pass butt-welding had high hardness value in the most electrodes and UWES was distributed to the hardness contribution of the most favorable and stability. Upon polarization test to measure the responsiveness of corrosion, the electrodes of UWEB was showed the most excellent degree because of the low open circuit dislocation.
김동섭(T. S. Kim),황성훈(S. H. Hwang) 한국유체기계학회 2003 유체기계 연구개발 발표회 논문집 Vol.- No.-
Micro gas turbines are designed with low turbine inlet temperature and pressure ratio. To overcome the efficiency defect of the simple cycle, adoption of the recuperator is an inevitable choice. In addition to the design performance, we should also pay attention to the off-design performance of gas turbines since they usually operate at part-load conditions for a considerable amount of the time. This study aims at analyzing off-design performance characteristics of micro gas turbines and addressing the importance of the recuperator in the part load operation. Comparative analyses have been performed to evaluate the part load performance differences among various design and operating options : simple vs recuperative cycles, single vs two shaft configurations, various operating strategies for the single shaft configuration (fuel only control, variable speed operation, variable inlet guide vane control), and current vs advanced engines. Major finding is that maintaining turbine at high level is crucial in efficient operation of micro gas turbines.