| Abstract:In order to solve the problem of multiple physical fields coupling in the simulation of transient tip clearance about core
engine, a 1D fluid network method, 2D axisymmetric finite element method, and the engineering calculation of temperature and displace?
ment were integrated in this paper to enable bidirectional heat transfer between air system calculation and temperature field calculation of
disc and casing; The temperature field of disc and casing provide a reference temperature of material properties and thermal load for
displacement calculation, while displacement calculation provides the air-solid heat transfer area in reverse; At the same time, displace?
ment calculation provides the seal clearance for air system calculation, finally, a transient clearance prediction method was established
based on aero-thermo-structural two-way coupling, with a core engine as the model, the influence of the seal clearance on the tip clear?
ance was emphatically studied. The results show that the seal clearance has a slight effect on tip clearance in idle state. In take-off state,
without coupling seal clearance will cause the maximum calculation error of the corresponding tip clearance by 0.125mm, and it is up to
22.4% about the change of its tip clearance. However, when the seal clearance change is less than 44.9% of its initial value, or the target tip
clearance is not related to the flow path where the seal is located, the above influence will be slight. When the initial seal clearance value
increases by 25%, the corresponding tip clearance variation will increase by 15.7% in the take-off state. |
