Heat Transfer and Stress Analysis of a Solar High Temperature Cavity Receiver Under Typical Operating Conditions
In order to ensure the safe and efficient operation of the receiver,a coupled thermal-mechanical model was established for the solar high-temperature cavity receiver,and numerical simulations were con-ducted on the heat transfer performance and mechanical properties of the receiver under typical operating conditions.Results show that the temperature distribution on the surface of the receiver spiral coil of is uneven,with maximum temperature difference of 247.37 K,resulting in uneven distribution of thermal stress.The cloud cover causes frequent changes in the outlet temperature,with maximum difference of 185.70 K,affecting the stability of the system.The temperature and stress of the coil wall change drasti-cally before and after cloud cover,which shortens the service life of the receiver.The effect of mass flow rate on coil stress is opposite between start-up and steady state.When the start-up mass flow rate is 0.02 kg/s,the outlet temperature of the working fluid is relatively high,while the maximum stress is close to the allowable stress,and the safety margin is low.In the actual operation,it is necessary to consider the balance of benefit and safety based on specific conditions,and then determine the optimal start-up mass flow rate.
万方数据
维普
