Study On Aerodynamic And Strength Analysis Of Retaining Ring Of F-grade Gas Turbine

Since the reform and opening-up policy, the development of our national economy israpid and the demand for electricity is increasing, which leads to the number and scale of thepower stations built recently increase in a high speed. At the same time, the economicbenefits of building a large-capacity generator unite are more significant. To buildhigh-performance large-capacity generator unite, the first problem confronted is increasingthe gas temperature of the gas turbine, which starts from the combustion chamber. However,the demand of high temperature and material thermal fatigue strength is a contradiction.Therefore, the gas turbine internal cooling is particularly important. Turbine retaining ring isthe key component to isolate the generator body from the high-temperature gas turbine, andhas an important role in the protection of the generator body. Aim at a Model F-turbineturbine retaining ring, this paper systematic researches the aerothermodynamics environmentof turbine retaining ring, through the disciplines of thermal field, flow field，thermal stress,fatigue and so on. And a conclusion was got, which is of important significances toengineering practice.In this paper, firstly we learn computational fluid dynamics knowledge, do multi-fieldcoupling analysis of turbine retaining ring through the ANSYS/CFX, and analyze calculationresults. Secondly we get heat transfer performance of the cold air and hot air surround theretaining ring and the retaining ring structure, temperature distribution characteristics. At lastwe calculate the pros and cons to determine the cooling effect of turbine retaining ring by thecold air gas film thickness.People pay increasing attention to the thermal stress analysis in the contemporary. Gasturbine as a large-scale power generation structure is a large heat production structure.Therefore we must consider the key components affected the influence of thermal stress inthe gas turbine. With the structural performance requirements becoming detailed, the fatiguelife of the structures is increasingly important. Since the retaining ring is in a hightemperature environment for a long time, it’s essential to study the nature of the thermal fatigue. In this paper, we do the thermal stress analysis and fatigue life analysis. we calculatethe temperature distribution state of the retaining ring in a run cycle, and thermal stressfatigue life of the retaining ring, which is caused by the temperature change in the gas turbinestartup and shutdown processIn order to obtain ideal model, we increase the thickness of the cool air gas film outsidethe retaining ring, Based on the above calculation process, this article do further structuraloptimization for the retaining ring. In this paper, optimization direction is to improve thetemperature distributed of the area at risk, and apply orthogonal test methods, design multiplevariables, get the optimization results after several tests, make thermal stress analysis of theoptimized structure and verify the result to meet the engineering needs.