Applicability Analysis of Cavitation Flow Field Simulation of Hydrodynamic Torque Converter Stator Under Stall Condition

Cavitation flow field of hydrodynamic torque converter under stall condition is simulated by different numerical simulation methods based on computational fluid dynamics, the cavitation morphological characteristics of stator blade surface simulated by different turbulence models and cavitation models are compared and analyzed. The incipient area of cavitation on the stator surface is located accurately and the spatio-temporal evolution law of cavitation morphological characteristics is revealed based on the simulation post-processing results, including velocity field, pressure field, bubble volume fraction, turbulent kinetic energy changing with time. The reliability and applicability of cavitation flow field simulation methods are comprehensively evaluated through the verification of external characteristic test results. Cavitation phenomenon is first to appear on the side of stator blade head biased to suction surface, and its morphological characteristics is similar to conical shape. The prediction error of torque ratio based on Z-G-B(k-w) model is minimum, the value is 0.055%. Relatively, the prediction error of torque ratio based on S-S(k-ε) model is maximum, the value is 8.791 %. The prediction accuracy of pump torque coefficient is close to the experimental results, and the error is less than 5%. Z-G-B(k-ω) model has the best prediction effect.