Analysis and optimization of heat dissipation of gas mainframe case based on field synergy principle

In order to ensure the safe and stable operation of gas turbine units, and grasp the heat transfer mechanism of the ventilation system of the mainframe housing, a study on the ventilation and heat dissipation of the main engine box of gas turbine units was carried out. Based on the principle of field synergy, the internal flow field, temperature field and heat dissipation performance of key equipments in the mainframe cabinet were analysed, and an optimized scheme for adding a flow-guiding device was proposed. The results show that the volume of the high-temperature area inside the mainframe housing is 7.6%, mainly concentrated near the gas turbine shaft component, which is the main heat source inside the mainframe housing, with an average external surface temperature of 86.94 <inline-formula><alternatives><math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mo>℃</mo></math><graphic specific-use="big" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="alternativeImage/A3C3F330-1450-42b4-9B12-7F5928EB8023-M001.jpg"><?fx-imagestate width="2.79399991" height="2.45533323"?></graphic><graphic specific-use="small" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="alternativeImage/A3C3F330-1450-42b4-9B12-7F5928EB8023-M001c.jpg"><?fx-imagestate width="2.79399991" height="2.45533323"?></graphic></alternatives></inline-formula>. After the installation of a 50° flow-guiding device, the volume of the high-temperature area inside the mainframe housing is reduced to 5.1%, and the average external surface temperature of the gas turbine shaft is reduced to 81.98 <inline-formula><alternatives><math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M2"><mo>℃</mo></math><graphic specific-use="big" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="alternativeImage/A3C3F330-1450-42b4-9B12-7F5928EB8023-M001.jpg"><?fx-imagestate width="2.79399991" height="2.45533323"?></graphic><graphic specific-use="small" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="alternativeImage/A3C3F330-1450-42b4-9B12-7F5928EB8023-M001c.jpg"><?fx-imagestate width="2.79399991" height="2.45533323"?></graphic></alternatives></inline-formula>. The heat dissipation effect is significantly improved.