Flight testing and analysis of gas turbine engine performance: A multivariable approach

Ilan Arush, Marilena Pavel

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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Helicopter performance flight-testing is an expensive activity that requires efficient testing techniques and appropriate data analysis for good performance prediction. Regarding the flight testing techniques used to evaluate the available power of a Turboshaft engine, current methodologies involve a simplistic singlevariable polynomials analysis of the flight test data. This simplistic approach often results in unrealistic predictions. This paper proposes a novel method for analyzing flight-test data of a helicopter gas turbine engine. The so-called ‘Multivariable Polynomial Optimization under Constraints’ (MPOC) method is proven capable of providing an improved estimation of the engine maximum available power. The MPOC method relies on maximization of a multivariable polynomial subjected to both equalities and inequalities constraints. The Karush-Khun-Tucker (KKT) optimization technique is used with the engine operating limitations serving as inequalities constraints. The proposed MPOC method is implemented to a set of flight-test data of a Rolls Royce/Allison MTU250-C20 gas turbine, installed on a MBB BO-105M helicopter. It is shown that the MPOC method can realistically predict the engine output power under a wider range of atmospheric conditions and that the standard deviation of the output power estimation error is reduced from 13hp in the single-variable method to only 4.3hp using the MPOC method (over 300% improvement).
Original languageEnglish
Title of host publicationProceedings of the 44th European Rotorcraft Forum
Subtitle of host publicationDelft, The Netherlands, 2018
EditorsChristophe Hermans
Number of pages11
Publication statusPublished - 2018
Event44th European Rotorcraft Forum - Delft, Netherlands
Duration: 18 Sep 201821 Sep 2018
Conference number: 44


Conference44th European Rotorcraft Forum
Abbreviated titleERF 2018


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