Monitoring oil condition

该项目旨在为民用发动机，特别是齿轮箱，建立一个飞行中油液状态监测原型系统，这是下一代超高涵道比（UHBR）涡扇发动机的一个重要特征。客户希望监测的情况是污染，如水和油的性质恶化。目前已有技术可以在地面实验室中测量这些情况，但挑战在于在飞行过程中监测油液，生成数据，这些数据可用于提高对飞行过程中发生的情况的了解，并形成维护改进的基础。核心技术包括一个薄膜铂传感器，该传感器向齿轮箱油提供小脉冲的热量，同时，测量油吸收热量的速率。热脉冲持续几毫秒，产生的温度上升小于2摄氏度。根据测得的热吸收率，可以非常准确地推断出油的热特性，即密度、热容和导热率的乘积。这个量被称为“热积”，这项技术由牛津大学开发并获得专利

This project aims to build a prototype system for in-flight oil condition monitoring for civilian engines, specifically for gearboxes, which are an essential feature in the next generation of ultra-high bypass ratio (UHBR) turbofan engines. The conditions which customers are seeking to monitor are contamination, such as water, and deterioration in the properties of the oil. Technologies currently exist to measure these condition in ground-based labs but the challenge is to monitor oil during flight, generating data which can be used to improve the understanding of what is happening during a flight and form the basis of improvements for maintenance.The core technology consists of a thin film platinum sensor that delivers a small pulse of heat to gearbox oil and, simultaneously, measures the rate of heat absorbed by the oil. The heat pulse last a few milliseconds and the resulting temperature rise is less than 2 degrees Celsius. Based on the measured rate of heat absorption, thermal properties of the oil can be inferred with extreme accuracy, namely the product of density, heat capacity, and heat conductivity. This quantity is known as "thermal product" and the technique was developed and patented by Oxford University