Abstract
According to the discontinuous structural characteristics of a gas turbine, by considering the contact thermal resistance of the rough surface, a contact thermal resistance measurement experiment was conducted in this study. The main objectives of this work were to investigate the influence mechanism and change law of the contact thermal resistance characteristics on flange installation. Furthermore, this study conducted a theoretical analysis of contact thermal resistance and the calculation of a typical flange mounting edge based on actual operating conditions. The research results show that the contact thermal resistance of a typical flange mounting edge increases with an increase in flange clearance under different tightening torques, which is essentially proportional to the flange clearance. As the flange clearance increases, the unit contact thermal conductivity firstly decreases rapidly. Then, as the flange clearance reaches 0.4 mm, the decreasing rate of unit contact thermal conductivity tends to flatten. In addition, the contact thermal resistance of the typical flange mounting edge decreases with the increase in the tightening torque under different flange clearances. Furthermore, the contact area ratio is not related to the material, and the contact thermal resistance under actual working conditions can be calculated using the unit contact area.
Highlights
Aero-engine casing is an important component of an engine, which supports rotating parts, fixes the stator blades and their accessories, and needs to transmit the thrustReceived: 20 January 2022 of the engine to form a gas flow channel [1]
Material for the assembled experimental section. It can be seen from the figure that as the flange clearance increases, the contact thermal resistance under different tightening torques increases
It can be seen from the figure that the unit contact thermal conductivity first decreases rapidly as the flange clearance increases, and when the flange clearance reaches 0.4 mm, the rate of decrease in the unit contact thermal conductivity tends to flatten
Summary
Aero-engine casing is an important component of an engine, which supports rotating parts, fixes the stator blades and their accessories, and needs to transmit the thrust. Received: 20 January 2022 of the engine to form a gas flow channel [1]. The distribution of a typical engine casing. Published: 26 February 2022 shells or conical shells, and each casing is connected by flange mounting edge structures, Aerospace. 2022, 9,stays x FOR PEER REVIEW Publisher’s. Note: MDPI neutral and the connection is performed by bolt structures. Aerospace9030121 with regard to jurisdictional claims in published maps and institutional affiliations.
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