Numerical simulation of transient cavitation characteristics of valve-controlled liquid-filled hydrodynamic coupling

In high-power impeller industries, valve-controlled liquid-filled hydrodynamic couplings are widely used in the soft startup of heavy-duty scraper conveyors for mining. However, water circulation speed internal flow fields is higher at lower ratios, making prone to severe cavitation, which further results performance degradation, noise, vibration, or even erosion failure. Meanwhile, because a coupling piece closed-loop multicomponent turbomachinery, transient cavitation behavior cannot be easily controlled. To reasonably predict characteristics and its influence on working coupling, high-quality structured mesh model field an was established. Considering periodic structural impeller, scale-resolving simulation turbulence combined with Rayleigh–Plesset establish single-cycle calculation model. The distribution torque transmission under different conditions were obtained, effect analyzed. demonstrated that mainly occurred low ratios. degree decreased as ratio increased. worst-case scenario when zero. Most bubbles generated tip blades, resulting unstable variation deterioration coupling. analysis reveals process highly periodic, development near blades occurs four stages: birth, growth, separation, disintegration. steam accumulates inner ring impeller. Therefore, method accurately predicting based high-precision technology proposed, theoretical basis design suppression provided.