Shock wave attenuation characteristics in the Tesla valve

A Tesla valve is a passive unidirectional flow conduit designed with specialized geometric. For reverse flow, the interaction between the channel and fluid results in energy dissipation and pressure reduction. As a kind of fluid characterized by high Reynolds numbers, a shock wave can also be attenuated by Tesla valves. If this attenuation can be controlled, it will offer a new approach to solving the challenge of measuring high-pressure shock wave parameters in near-field explosions. We use numerical methods to investigate the attenuation characteristics of shock waves within the Tesla valve, clarifying the influence of different Tesla valve geometric and load parameters on the attenuation effect. The results show that a Tesla valve with two basic units produces two pressure peaks at its inlet and four peaks at the outlet. We also found that reducing the inner diameter d and increasing the incident load intensity both improve the attenuation rate and the diodicity. However, increasing the diversion angle α results in a higher pressure attenuation rate but lower diodicity. In addition, increasing α also prolongs the time interval between the overpressure and the flow velocity reaching the maximum value, respectively, thus realizing the effect of decoupling the overpressure and the dynamic pressure in time. This paper identifies the relationship between the geometric parameters of the Tesla valve and the shock wave pressure attenuation rate and diodicity. These findings provide valuable references for the optimized design and performance prediction of Tesla valves in controlling the attenuation of shock waves.