玻璃管束与多孔介质双梯度吸热器能流均匀化OA

To improve the uniformity of solar flux distribution and thermal efficiency in high-temperature solar receivers,while preventing localized overheating,this study proposes a dual-gradient solar receiver.This design combines cut-angle quartz glass tube bundles with porous media,introducing gradients in both optical absorption and axial geometry.Five absorber configurations with varying axial gradients—GP0,GP25,GP50,GP75,and GP100—were developed for comparative analysis.Solar flux distribution was evaluated using a Monte Carlo ray tracing method,supported by experimental validation.Results show that the cut-angle quartz glass tube bundles can effectively reduce solar reflection losses compared to conventional designs.The radial gradient design of the cut-angle quartz glass tube bundle can slightly reduce the peak density of the solar flux.When the particle-to-tube diameter ratio(D/d)is 5,increasing the axial gradient leads to a gradual expansion of the effective heat absorption area and a notable improvement in flux uniformity.Compared with the 1.33MW/m2 peak energy flux density of GP0,the peak energy flux density of GP100 is reduced to 0.68MW/m2,which is about half of the former,and the overall distribution of solar flux is more uniform.These findings offer valuable insights for improving solar flux uniformity in porous media solar receiver.