Abstract
Small jet and turboprop engines usually use centrifugal compressors. Compressor stable operation is very important for jet engine work and its use. This paper deals with centrifugal compressor stability margin assessment. The appropriate parameter is selected to inform us about working regime in which jet engine (compressor) works in terms of its stable operation.
Highlights
Along operation and testing of jet engines, the operating point does not move only across the operating line shown in the compressor characteristics, and outside of it
The goal of this study is to find an appropriate parameter that could both analyze and depict this dangerous behaviour
This means that the same change in the standard deviation of pressure P3 can be caused by a change of RPM without the working point approaching the surge line
Summary
Along operation and testing of jet engines, the operating point does not move only across the operating line shown in the compressor characteristics, and outside of it. Especially during acceleration, the operating point is reaching close to the surge line. To increase the stability margin, several anti-surge devices can be used that are able to move surge line to smaller mass flows in certain regimes of the engine. This means that the compressor could operate stably in a wider range of operation. The preceding unstable operation is oscillatory but still quite safe compared to the deep surge. The goal of this research was to describe typical changes in engine parameters and to define a stipulated limit of engine safe operation
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