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DESIGN OF FACILITIES FOR ALTITUDE TESTING OF AVIATION DIESEL ENGINES

机译：航空柴油机高空测试设备的设计

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摘要

Our research group is involved in the development of aviation diesel engines for highrnaltitude applications, and this paper describes the activity concerning the design of newrnexperimental facilities for altitude testing. Two different solutions are evaluated: arnhypobaric chamber reproducing altitude effects on the ground and an experimentalrnairplane for testing in flight. The ground test facility should consist of a chamber, withinrnwhich the engine, the turbo charging and the refrigerating systems are mounted, and inrnwhich the atmosphere is maintained at altitude conditions (low pressure andrntemperature). Different architectures and system designs are discussed and evaluated.rnThe second solution concerns the installation of the test engine as aft engine of a Cessnarn337, ‘push-pull’ twin engine aircraft, that provides the possibility to mount twornpropellers on the aircraft’s centreline. The rear test engine installation has been analyzedrnto provide all necessary modifications for cowling, cooling systems installation, enginerncontrols, gearbox, fuel system, data acquisition system and test engineer console. Arnfinal discussion evaluates advantages and disadvantages of both solutions.
机译：我们的研究小组参与了用于高海拔应用的航空柴油发动机的开发，本文描述了有关用于海拔测试的新型实验设施设计的活动。评估了两种不同的解决方案：低压降压舱室在地面上再现高度影响，以及用于飞行测试的实验飞机。地面测试设施应包括一个安装有发动机，涡轮增压和制冷系统的腔室，以及一个将大气保持在海拔高度条件（低压和低温）的腔室。讨论并评估了不同的体系结构和系统设计。第二种解决方案涉及将测试发动机安装为Cessnarn337的“推拉式”双引擎飞机的尾部发动机，从而可以在飞机的中心线上安装两个螺旋桨。对后部测试发动机的安装进行了分析，以提供整流罩，冷却系统安装，发动机控制，变速箱，燃油系统，数据采集系统和测试工程师控制台的所有必要修改。 Arnfinal讨论评估了这两种解决方案的优缺点。

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