Prediction of static characteristics of cryogenic hybrid journal bearing for reusable pump-fed liquid rocket engine by computational fluid dynamics simulation

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(3)

Published: March 1, 2025

The utilization of reusable rockets presents a promising design solution for the reduction space transportation costs. maintenance turbomachinery is costly process. Of these, bearings turbopump are among most critical components. Hybrid bearings, which combine hydrostatic and hydrodynamic bearing technologies, regarded as particularly rocket propulsion systems. objective this research was to conduct numerical analysis that would contribute development cryogenic hybrid can enable stable wide-ranging operations. Three-dimensional computational fluid dynamics simulations were conducted tested journal based on Reynolds-averaged Navier–Stokes with sub-models accounting effects turbulence cavitation. static characteristics high-speed investigated geometry liquid methane in University Pisa. A series investigate inlet outlet pressure ratios flow rates, important parameters representing bearings. These performed varying shaft eccentricity conditions. Moreover, simulation results revealed internal within narrow clearance key factor occurrence cavitation its subsequent impact performance. Furthermore, distribution force evaluated by comparing without consideration occurrence. We clarified model had significant influence performance prediction.

Language: Английский

Mixed lubrication characteristics of multi-layer composite structure water-lubricated stern bearing considering fluid–structure interaction and journal misalignment effects

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(5)

Published: May 1, 2025

In order to solve the problem of uneven pressure distribution in traditional water-lubricated bearings, a multi-layer composite structure bearing is proposed this paper. Considering fluid–structure interaction and journal misalignment effects, mixed lubrication model established. Based on aforementioned model, first, experimental tests are conducted verify accuracy model. Second, characteristics single layer compared. Finally, effects external load, rotational speed, aspect ratio pressure, film thickness, friction coefficient investigated. The research results show that can improve uniformity, enhance minimum reduce friction. By studying under different parameter conditions, it provides theoretical support for structural optimization stern bearings.

Language: Английский