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首页> 外文期刊>Journal of Engineering for Gas Turbines and Power >Ejector Application for Scavenging of an Aero Engine Bearing Chamber
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Ejector Application for Scavenging of an Aero Engine Bearing Chamber

机译：喷射器在航空发动机轴承室清理中的应用

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Oil system architecture in aero engines has remained almost the same for the last 35 years. At least one mechanically-driven oil feed pump is responsible for distributing pressurized oil into the bearing chambers and several scavenge pumps, also mechanically driven, are responsible for evacuating the bearing chambers from the oil and air mixture. Air is used as the sealing medium in bearing chambers and is the dominant medium in terms of volume occupation and expansion phenomena. In order to simplify the oil system architecture, improve the system's reliability with less mechanical parts, and also decrease weight, an ejector system has been designed for scavenging bearing chambers. In Flouros et al. (2013, "Ejector Scavenging of Bearing Chambers. A Numerical and Experimental Investigation," ASME J. Eng. Gas Turbines Power, 135(8), p. 081602), an ejector system was presented which used aviation oil (MIL-PRF-23699 Std.) as the primary medium. In the course of further development, the original design was modified leading to a much smaller ejector. This ejector was tested in the rig using alternatively pressurized air or pressurized oil as primary medium. Additionally, three in-house developed primary nozzle (jet) designs were introduced and tested. The design of an ejector for application with compressible or incompressible media was supported through the development of an analysis tool. A momentum-based efficiency function is proposed herein and enables comparisons among different operating cases. Finally, ANSYS cfx (ANSYS, 2014, "ANSYS® CFX, Release 14.0," ANSYS Inc., Canonsburg, PA) was used to carry out the numerical analysis. Similar to the ejector described in Flouros et al. (2013, "Ejector Scavenging of Bearing Chambers. A Numerical and Experimental Investigation," ASME J. Eng. Gas Turbines Power, 135(8), p. 081602), the new design was also manufactured out of pure quartz glass to enable optical access. Through suitable instrumentation for pressures, temperatures, and air/oil flows, the performance characteristics of the new ejector were assessed and were compared to the analytic and numerical results. This work was partly funded by the German government within the research program Lufo4 (Luftfahrtforschungsprogramm 4/Aeronautical Research Program 4).
机译：在过去的35年中，航空发动机的机油系统架构几乎保持不变。至少一个机械驱动的给油泵负责将加压的油分配到轴承腔中，几个也由机械驱动的扫气泵负责从机油和空气混合物中抽空轴承腔。空气被用作轴承腔中的密封介质，就体积占据和膨胀现象而言，它是主要介质。为了简化机油系统架构，以更少的机械零件提高系统的可靠性，并减轻重量，已经设计了用于清除轴承腔的顶出系统。在Flouros等。 （2013年，“轴承箱的喷射器清除。数值和实验研究”，ASME J. Eng。Gas Turbines Power，135（8），第081602页），提出了一种喷射器系统，该系统使用了航空机油（MIL-PRF- 23699 Std。）作为主要媒体。在进一步的开发过程中，对原始设计进行了修改，从而使弹出器变得更小。该喷射器在钻机中进行了测试，使用压缩空气或压缩油作为主要介质。此外，引入并测试了三种内部开发的主喷嘴（jet）设计。通过开发分析工具，可以支持用于可压缩或不可压缩介质的喷射器设计。本文提出了一种基于动量的效率函数，该函数可以在不同的运行情况之间进行比较。最后，使用ANSYS cfx（ANSYS，2014，“ANSYS®CFX，14.0版”，ANSYS Inc.，Canonsburg，PA）进行数值分析。与Flouros等人描述的喷射器相似。 （2013年，“轴承箱的喷射器清理。数值和实验研究”，ASME J. Eng。Gas Turbines Power，135（8），第081602页），新设计也由纯石英玻璃制成，以实现光学访问。通过适用于压力，温度和空气/油流量的仪器，评估了新喷射器的性能特征，并将其与分析和数值结果进行了比较。这项工作部分由德国政府在Lufo4研究计划（Luftfahrtforschungs计划4 /航空研究计划4）中资助。

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