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HRSG 배관 실링장치 성능향상을 위한 스프링댐퍼 개발
정윤성(Yoon-seong Jeong),피용희(Yong-Hui Pi),박준수(Jun Su Park) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
HRSG has a lot of pipes to generate steam by the wast heat of gas turbine. The pipe vibration in HRSG induces the pipe damage and a combustion gas leak. For this reason, the vibration damper should be needed to prevent a gas leak and improve the efficiency of HRSG. Leaf spring is a good device to decrease a vibration of pipe in HRSG. A performance of leaf springs is expressed by the spring constant which is decided by the number of spring, layer, board and thickness of leaf springs. We calculated a spring constant on the base of the amount of deformation for leaf springs using ANSYS. According to the results, the spring constant of leaf spring increases, when the number of sequence & layer increase. Therefore, To decrease a vibration of pipe in HRSG, the leaf spring should be composed with multi spring and layer.
블레이드 전방 베인 설치에 따른 블레이드 바닥면에서의 이차와류 및 열전달 특성 연구
정국진(Kuk Jin Jung),박성호(Seong Ho Park),피용희(Yong hui Pi),박준수(Jun Su Park) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
To reduce NOx emissions in gas turbines, there is a change in combustion method and combustor design. This change not only adds to the heat load in the endwall but also creates a step in assembling the blades and vanes. Depending on the shape and size of the steps, various heat transfer characteristics are exhibited in the endwall. Therefore, this paper investigated the characteristics of secondary vortex and heat transfer on the endwall according to the step size through experimental study. Experiments were performed using a seven-blade linear cascade with a rod simulating step. Experimental results show that the horseshoe vortex and passage vortex were most noticeable. The influence of the horseshoe vortex on the leading edge depends on the diameter of the rod. Also the passage vortex had different ranges of influence on the suction side and the pressure side. Therefore, the cooling method for each area of the endwall should be studied to meet the step size.