Design and Performance Analysis of a New Non-contact Selfimpact Seal

Introducing blocking fluid to implement sealing function is a basic form of non-contact sealing. Low throttling efficiency is the key problem that restricts the performance improvement and system simplification of this kind of technology. By virtue of its unique shape structure,Tesla valve has high throttling efficiency and ingenious section by section impact blocking characteristic formed when reverse flow occurs. Based on this structure,a new type of non-contact self-impact sealing structure is proposed, which has the characteristics of zero wear, high stability, simple structure and high throttling efficiency. CFD technology is used to simulate the performance of the new seal under different structures and working parameters. Results show that: Compared with the horizontal and stepped self-impact sealing structures, the cascade structure has higher efficiency of series arrangement, and the best leakage suppression effect is achieved when the AbBa type combination and the staggered ratio k=2. The leakage of