Start-up performance and optimization of the stirring wind-heating system

The stirring wind-heating system uses natural wind as the power to drive the wind turbine so that the wind turbine directly drives the heater to stir the liquid to generate heat. Therefore, the mechanical energy is directly converted into heat energy. The start-up process is a crucial step for the regular operation of the stirring wind-heating system. To optimize the start-up performance of the stirring wind-heating system, its structure is improved in this work. In the system, the flexible connection is realized by using the torque-limited hydraulic coupling instead of the mechanical shaft connection. The torque characteristic is the characterization of the start-up performance of the system. Therefore, the stirring wind-heating test-bed was designed. Taking the torque in the starting process as the primary research object, the start-up performance of different schemes of the system was tested respectively under different working conditions, such as stirring speed, angular acceleration, and liquid-filled content of the heater. After improving the connection structure of the system, the starting torque is reduced from 2.2, 4, and 7.2 N·m to 0.68, 0.9, and 1.46 m, respectively, which optimizes its starting performance.