NDLI: Variable Speed Power Turbine Preliminary Design Optimization for Rotorcraft Applications

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Variable Speed Power Turbine Preliminary Design Optimization for Rotorcraft Applications

Content Provider	Semantic Scholar
Author	Misté, Gianluigi Alberto Pellegrini, Alvise Benini, Ernesto
Copyright Year	2014
Abstract	Variable speed rotor studies represent a promising research field for rotorcraft performance improvement and fuel consumption reduction. The turboshaft engines employed to drive helicopter rotors usually operate at a constant design speed, within a narrow RPM range. One of the reasons for choosing a constant speed is linked to free power turbine (FPT) performance deterioration in off design conditions. However, in order to minimize helicopter absorbed power, main rotor speed should be adjusted depending on advancing speed, weight and altitude. In fact, each different flight condition is characterized by a specific optimal rotor speed; unfortunately, optimal main rotor speed and optimal engine speed, when employing a fixed ratio transmission, represent two mutually exclusive goals. The benefits related to optimal main rotor operation may be eventually cancelled by strong deviations from FPT design speed, leading to higher turbine losses and thus higher fuel consumption. A possible way to overcome this problem is given by an appropriate redesign of the FPT stages, in order to decrease the stage efficiency sensitivity to RPM variation. The present study analyzes the abovementioned issue focusing on the design methodology required to obtain improvements in turbine efficiency at off design RPM values. The work is carried out upon the GE T700 turboshaft engine, mounted on the UH60 Black Hawk helicopter; performance data related to main rotor power and baseline engine fuel consumption are obtained by means of validated numerical simulators. The redesign phase of the T700 two-stages axial power turbine is reported; the final objective is to prevent engine performance deterioration when operating at optimal main rotor speed for different flight conditions.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://congress.cimne.com/iacm-eccomas2014/admin/files/filePaper/p747.pdf
Alternate Webpage(s)	http://congress.cimne.com/iacm-eccomas2014/admin/files/fileabstract/a747.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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