Study on Flow and Heat Transfer Characteristics of Tenon Joint Gap Between Gas Turbine Blade and Disk

In order to design the secondary air system of gas turbine accurately, the flow and heat transfer in the tenon joint gap of gas turbine rotor blade and disk are studied. The flow resistance and heat transfer characteristics of the S shaped tenon joint gap between blade and disk in gas turbine arc investigated experimentally, and detailed flow field is studied numerically. Firstly, the flow resistance and Nusselt number of the gap are measured by pressure scanning valve and thermochromic liquid crystal, respectively. Then the turbulence model used in numerical calculation is validated by the experimental results, and the grid independence is verified. At last, the effects of flow and structure parameters on tenon joint gap flow and heat transfer are analyzed, in which, five different Reynolds numbers, five different relative heights of the gap and five different widths of the gap arc conducted. The results show that the average Nusselt number on the left wall is consistently around 10% higher than that on the right side. As the Reynolds number increases, the flow resistance coefficient and heat transfer intensity of the assembly gap increase gradually. When the Reynolds number increases from 15 000 to 35 000, the average flow resistance coefficient and the average Nusselt number on both sides increases by 300% and 110% respectively. With the increase of the relative height of the assembly gap, the flow resistance coefficient and the wall average Nusselt number decrease gradually. Increasing the gap width leads to a 30. 7% average flow resistance coefficient increase within the test range, with the average Nusselt number on both sides increasing by 95. 5% and 94. 9% respectively. © 2024 Xi'an Jiaotong University. All rights reserved.