Numerical investigation on heat transfer and flow in the cross-corrugated primary surface duct

摘要

Microturbines are wide application prospects in large quantities in the distributed power generation field.The microturbines efficiency improvemants and higher recuperator effectiveness must request to look for innovative design solutions.The cross-corrugated (CC) surface heat exchanger is one simple structure type with the higher heat transfer coefficient as well as the compactness.In the present work, numerical simulations have been carried out to investigate the characteristic of heat transfer and flow in the cross-corrugated primary surface duct.The results of various gas inlet temperatures or mass flow rates are compared respectively, the instantaneous temperature and velocity fields are obtained.The numerical result is agreed with the experimental correlation.The effects of inlet temperature and mass flow rate on outlet temperature, pressure drop, Nusselt number, total heat transfer rate and effectiveness are analyzed.The results indicated that the effectiveness is 72％-88％ and decreases with the increasing Reynolds number of gas.The outlet temperature, Nusselt number, and pressure drop increase, while the total heat transfer rate increases slightly.