چكيده به لاتين
Considering the advantages of gas turbine compared to other power generation machinery, we are seeing an increasing use of them for power generation in industrial, air and power applications. One of the disadvantages of gas turbine is its low thermal efficiency. By increasing the input temperature to the turbine in the gas turbines, we can increase the thermal efficiency, which is why we always seek to increase the input temperature to the turbine. The most important limitation in increasing the input temperature to the turbine is the material used in the manufacture of turbine blades that can withstand certain temperatures. To increase the temperature of the turbine inlet as well as the non-exceeding of the tolerable temperature for the blade surface, we need to use cooling turbine blades. In general, cooling methods are divided into two general types of internal and external cooling. One of the methods of internal cooling is the Convection cooling. a number of test Setup have been developed to examine the cooling of the gas turbine blade at various universities in the world, using which the cooling Correlation are extracted for various Turbolator. Due to the uncertainty in the published Correlation for the cooling Turbolator and the existence of errors in these Correlation, which in some cases were reported by gas turbine manufacturers up to 100 percent, a test Setup is being developed in this Research to verify the validity of these Correlation. The main test channel consists of a square-channel channel, which Turbolator elements on its lateral walls. The heat flux is applied by using a number of heaters on the side walls, and on the other hand by Streaming the flow of the cooling fluid in this channel, these walls are cooled. This Setup can test in the Reynolds range from 5,000 to 120,000 and in the Rotation Number range of 0 to 0.5. Using this device, it is possible to check the correctness of the published Correlation in the sources for the cooling of the various Turbolator elements.
In this research, conceptual design and finally the construction of a turbine blade convection cooling rotary test setup have been investigated. After conducting the cooling tests, the results were consistent with the results presented in the sources. Investigating the effects of the rotation on cooling indicates that the rotation increases the heat transfer in the Trailing edge wall and decreases it in the leading edge.
Keywords: cooling, gas turbine, heat transfer, setup
