Lubrication oil, which is supplied to rotating elements in gas turbines of combined-cycle power generation, is used to maintain the efficiency of electricity production. The gas turbines are exposed to high-temperature environment due to the thermal energy obtained from fossil fuel, which degrades the performance of the lubricating oil. A system for controlling the temperature of the oil is essential, but there are a few problems in the case of the temperature control valve in the system, such as the hunting phenomenon, with which the target mass flow rate cannot be achieved, fatigue fracture and leakage. In this study, finite element analysis was performed to overcome these issues. The hunting phenomenon was prevented by redesigning the orifice shape of the valve cage. The fatigue fracture and self-loosening of the clamp bolt were overcome by changing the bolt size and tightening torque. In addition, a proper O-ring was selected to prevent leakage. The performance of a prototype was also tested to verify the reliability of the finite element analysis.

提供给联合循环发电的燃气轮机中旋转元件的润滑油用于维持发电效率。燃气轮机由于从化石燃料获得的热能而暴露于高温环境中，这降低了润滑油的性能。一个用于控制油温的系统是必不可少的，但是在系统中使用温度控制阀的情况下，存在一些问题，例如无法实现目标质量流量的波动现象，疲劳断裂和泄漏。在这项研究中，进行了有限元分析以克服这些问题。通过重新设计阀笼的孔口形状可以防止出现振荡现象。通过改变螺栓尺寸和拧紧扭矩，可以克服紧固螺栓的疲劳断裂和自松动。此外，选择了合适的O形圈以防止泄漏。还测试了原型的性能，以验证有限元分析的可靠性。