Numerical Study Of The Flow And Cooling Of The Hydrogen-oxygen Combined Cycle Power Plant Turbine Vanes

Energy exploitation and environmental protection are two important issues for sustainable development in modern society. Looking for clean and highly efficient form of energy is a necessary requirement for future development of society. As a clean energy fuel, hydrogen will have a more broad application prospects in the future. Development of efficient hydrogen conversion methods is a hot research topic.Hydrogen-oxygen combined cycle power plant is a kind of power form that uses pure hydrogen as fuel, pure oxygen as the oxidant; these two kinds of gas generate high temperature and pressure of water vapor (1700℃) through direct combustion, and then the water vapor is injected into the power turbine directly to generate power. Complete combustion of hydrogen and oxygen, resultant is only water. There are no other emissions in addition to the excess water discharged to the outside of the device. Similar to fuel cells efficiency, the thermal efficiency of the device can also reach more than 70%. Hydrogen-oxygen combined cycle power plant can transplant a lot of conventional steam turbine and gas turbine technologies. The device has high operating parameters, can achieve a great power value. Compared with fuel cells this is one of the major advantages of this device.Hydrogen-oxygen combined cycle power plant can reach such high thermal efficiency, the main reason is that the device has a high inlet temperature, and thus the cooling issue of the turbine blades is the main technical challenge faced by hydrogen-oxygen combined cycle power plant. The cooling performance research of the turbine blades is very necessary. In this dissertation, the main content is numerical study of the flow and cooling performance of the first stage of the hydrogen-oxygen combined cycle power plant turbine vanes. In this study, I use a three-dimensional model of the first stage turbine vane of a certain type conventional gas turbine, numerical simulation of the turbine vanes which use steam and gas as the working fluid by heat transfer and flow coupled method respectively ANSYS CFX 11.0. Under corresponding conditions, comparative study of the flow and heat transfer of steam and gas working fluid, identify the flow and heat transfer characteristics of the hydrogen-oxygen combined cycle power plant turbine vanes when the working fluid is high temperature and pressure steam. By numerical calculation, gain the flow and heat transfer characteristics of internal and external of the turbine vanes, including the flow field characteristics of external and internal cooling structure of the turbine vanes; turbine vanes cooling efficiency; turbine vanes temperature and inside and outside surface heat transfer coefficient distribution. Analysis the different entrance parameters of the cooling gas impact on the cooling performance of the turbine vanes, provide technical support for turbine blade cooling designing.