Fluid Flow And Heat Transfer Of A Ribbed Channel Of Aero-angine Turbine Blades Based On The Hierarchical Design

In order to further improve the thermal efficiency and output power of the aeroengine,the gas inlet temperature in front of the turbine increases with the increase of the thrustweight ratio.As a typical hot end component of aeroengine,the thermal load of turbine blade is also greatly increased.In the traditional rib design work,the ribs are usually of single size,regular arrangement and periodic arrangement.This design method is often at the cost of greatly increasing the flow resistance to obtain heat transfer enhancement.In this context,this paper proposes a hierarchical design concept for the first time,aiming at solving the pain point of traditional rib design,that is,reducing resistance as much as possible while ensuring heat exchange capacity.For this reason,this article first proposes three new rib configurations based on the new design concept of square straight ribs in the height direction,and fully uses three-dimensional numerical simulation to verify the feasibility of the new rib configurations in different Reynolds number range.The calculation results show that the arrangement methods of linearly decreasing the rib height can significantly reduce the pressure loss while slightly reducing the heat transfer performance,so their comprehensive heat transfer performance is greatly improved.In addition,this article further validates the effectiveness of the current hierarchical design scheme by influencing the parameters related to rib spacing(P/e),channel aspect ratio(W/H),sidewall effect,and inlet effect.In this paper,the universality of hierarchical design is also studied.First,the flow and heat transfer characteristics of the ribbed channel under four rib configurations(transverse ribs,inclined ribs,V-shaped ribs,and inverse V-shaped ribs)and two designs(uniform design and hierarchical design)are studied by numerical simulation to clarify the effectiveness and applicability of the hierarchical design concept.The slight reduction of the heat transfer performance and the marked resistance reduction comes from the combination of the constrained secondary flows and the lowering effect of the mainstream.In addition,this paper also conducted a study on two parameters,namely,the initial rib height and the height difference between adjacent ribs,for two rib configurations,namely,straight ribs and V-shaped ribs,to further demonstrate the effectiveness and applicability of the hierarchical design concept.In summary,hierarchical design has effectively solved the problem of significant increase in resistance in current rib design and demonstrated good universality.It is hoped that it can provide certain reference significance for relevant researchers.