| Popis: |
The oxygen pressurisation system for the main stage Ariane 6 is currently under development at Airbus Safran Launchers. The oxygen pressurisation plate, termed the PPO, will be responsible for controlling pressurisation gas mass flow to the main stage oxygen tanks and is a critical component of the oxygen pressurisation system. The flow control in this plate is made by a force-piloted electrovalve, termed PPx. The control of oxygen mass flow in high temperature, up to 440 K, and high pressure, up to 180 bar, provides a significant technical challenge from both the functional and oxygen compatibility points of view. This paper outlines the development of the PPx valve in the context of the PPO. The PPx is presented along with an overview of the development program. During the early design process three-dimensional computational fluid dynamic simulations were found to be an effective tool and lead to designs with optimised mass flow rates. Two-dimensional computational fluid dynamic simulations combined with functional modelling lead to identification of design aspects with high impact on pressure-piloted valve functionality. Additionally functional modelling allowed identification of critical operational points within the wide operational range specified by requirements and for which the PPx and PPO must displace robust functionality. |
