Investigation of suction pressure pulsation prediction of rotary compressor with total variation diminishing scheme and one-dimensional accumulator model

摘要

The suction pressure pulsation plays a significant role in rotary compressor performance, so employing gas dynamic model for simulation is critical for compressor performance prediction and structure design. Comparing with the conventional Lax-wendroff two-step (LW2) scheme which has been usually utilized with good behaviors of speed and stability, this paper adopted the total variation diminishing scheme with higher convergence speed and less dispersion. And the common zero-dimensional model for the accumulator is updated to a one-dimensional model achieving more accurate pressure results at the suction pipe inlet. The simulation results of instantaneous pressure are also compared with experimental measured data under different conditions. The Pearson Correlation Coefficient of simulated pressure curves are all higher than 0.9 and the relative errors of predicted performance are almost all less than 5%, which indicates better agreement on pressure pulsation simulation and performance prediction.