The paper presents the conditions for the icing of a TW2-117 turboprop engine installed on a Mi-8 helicopter. The changes in the basic operating parameters of this engine are presented. A rather chaotic change in these parameters was demonstrated following the icing of the engine inlet tunnel, as well as a very significant change in temperature in the section from the engine inlet cross-section to the inlet guide vane cross-section, which can cause icing of the compressor guide vanes and thus disrupt the inlet flow. This phenomenon is the cause of engine surge, which can ultimately lead to engine flameout. The conducted research was based on the operating parameters of the TW2-117 engine that occurred during an aviation incident in 2004 on a Mi-8 helicopter.During the autumn and winter period, the operation of aircraft and their equipment is significantly complicated by variable weather conditions.
Particularly dangerous is the occurrence of icing, which significantly impairs the flight characteristics of an aircraft, increases its weight, and reduces engine power and thrust. (…)
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Source: Logistyka Magazine
Turboprop engine operation under inlet tunnel icing conditions – PDF file for download