Detached Eddy Simulation of Transition in Turbomachinery: Linear Compressor Cascade

The adaptive, ℓ²–ω delayed detached eddy simulation model was selected to simulate the flow in the V103 linear compressor cascade. The Reynolds number based on axial chord length is 138, 500. Various inflow turbulent intensities from 0% to 10% were tested to evaluate the performance of the adaptive model. The adaptive model is capable of capturing the laminar boundary layer and the large-scale perturbations inside it. The instability of large-scale disturbances signals the switch to a hybrid simulation of the turbulent boundary layer—thus, the transition front is predicted. In the case of separation-induced transition, the adaptive model, which uses eddy simulation in separated flow, can predict the separation bubble size accurately. Generally, the adaptive ℓ²–ω model can simulate the transitional separated flow in a linear compressor cascade, with a correct response to varying turbulent intensities.