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• W2225878123 abstract "Abstract An optimized rotorcraft propulsion system incorporating a foil air bearing supported Oil-Free engine coupled to a high power density gearbox using high viscosity gear oil is explored. Foil air bearings have adequate load capacity and temperature capability for the high-speed gas generator shaft of a rotorcraft engine. Managing the axial loads of the power turbine shaft (low speed spool) will likely require thrust load support from the gearbox through a suitable coupling or other design. Employing specially formulated, high viscosity gear oil for the transmission can yield significant improvements (~2X) in allowable gear loading. Though a completely new propulsion system design is needed to implement such a system, improved performance is possible. Introduction Rotorcraft propulsion systems are comprised of two primary components, the engine and the transmission or drive system. These components are lubricated with highly developed oils delivered by complex lubrication systems. To reduce overall system weight and logistical inventory expenses, many rotorcraft employ a common lubricant, typically an ester based fluid (e.g., Mil-L-7808). Using such a “single fluid” approach necessitates that the oil be capable of lubricating both relatively hot engine components like bearings (~200 °C) and cooler (~100 °C), yet more heavily loaded, components such as transmission gears (ref. 1). As a result, the oil properties are a compromise suitable for engine use yet adequate for lubrication of transmissions (ref. 2). The U.S. NAVY has highlighted the downside of using single multi-purpose lubricant rather than oils specially formulated for a particular application (ref. 3). For flight vehicles operating in maritime theaters, corrosion of gears and transmission components is a serious problem (ref. 2). In fact, corrosion is the leading damage mechanism for rotorcraft transmission systems in U.S. NAVY applications. To address this problem, the U.S. NAVY has developed a two fluid propulsion system in which specially formulated oil, optimized for corrosion protection, is used in the transmission and a high-grade engine oil (Mil-L-23699) is used in the engine. An extensive body of research has shown that using transmission oil with specialized corrosion inhibiting agents led to vastly improved gear and bearing life in rotorcraft operating at sea. The deployment of dual lubricant propulsion systems has become commonplace in those applications (ref. 3). Unfortunately, this two fluid approach leads to a weight penalty for the separate lubrication system. Other rotorcraft applications, both commercial and military, have retained the use of common fluid and lived with the compromised performance it provides (ref. 4). Nonetheless, there are clear examples that rotorcraft transmissions can be improved through the use of a gearbox specialized oil. While the U.S. Navy’s emphasis has been on the use of transmission oil tailored for corrosion protection, it may also be possible to develop such an oil to be tailored to allow higher loading in the transmission possibly providing significant weight savings in the main gearbox. In this paper, an additional approach to avoid the need for dual fluid lubrication is proposed; the use of an Oil-Free turbine engine coupled with a high power density transmission lubricated with high viscosity gear oil." @default.
• W2225878123 created "2016-06-24" @default.
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• W2225878123 date "2007-06-01" @default.
• W2225878123 modified "2023-09-26" @default.
• W2225878123 title "Oil-Free Rotor Support Technologies for an Optimized Helicopter Propulsion System" @default.
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