Analysis of an aircraft engine start-up process on the example of the PZL-130 TC-II „Orlik” training aircraft

• Autorzy: Kowalski M.

Identyfikatory

DOI

10.5604/12314005.1133202

• Języki publikacji: EN

Abstrakty

EN

The paper discloses the analysis of processes that take place during the start-up operation of the driving unit for the training aircraft of the TZL-130 TC-II Turbo-Orlik type. The aircraft is designed for selective and initial trainings at the Air Force School of “Little Eagles” in Dęblin. The driving unit comprises the PT6A-25C turbo-propeller engine from Pratt & Whitney combined with the four-bladed airscrew from Hatzell. It is specifically mentioned that data for the analysis were sourced from the S2-3a on-board recorder of flight parameters manufactured by the Air Force Institute of Technology (AFIT). The analysis was carried out both during ground and flight tests. The paper briefly outlines general structures and operation principles of typical start-up systems with the focus to their key components. Attention is paid to how important it is to select an appropriate start-up system to match the specific aircraft type and the guideline parameters for selection that should be adhered to are specified. Also there are disclosed the key mathematical relationships that are indispensable to design start-up systems and to find out their basic characteristics. It is emphasized that the start-up operation must be considered as a non-stationary process that lasts from the standstill state of the engine until the moment when the minimum required rpm is reached, sufficient to generate necessary power of the engine. In addition, the attention is paid to the fact that the value of the engine acceleration is crucial to the achievable start-up time that is deemed as one of key parameters for all start-up systems. It is demonstrated that to achieve the required level of acceleration, it is necessary to secure the so called overhead of the engine power which needs constant flow offuel and air into the combustion chamber of the engine. The last part of the paper comprises selected characteristic curves that were obtained from the analysis of the engine start-up processes both on ground and in flight. The final conclusions emphasize that the start-up system for the presented driving unit is really efficient and guarantees correct operation of the engine under any conditions.

Słowa kluczowe

EN

diagnostics of aircraft engines; qualification tests of aircraft driving units

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2014
• Tom: Vol. 21, No. 3
• Strony: 177--189
• Opis fizyczny: Bibliogr. 7 poz., rys.

Twórcy

autor

Kowalski M.

• Air Force Institute of Technology, Ksiecia Boleslawa Street 6, 01-494 Warsaw, Poland tel.: [phone], fax: [phone]

Bibliografia

• [1] Boliński, B, Stelmaszczyk, Z., Operation of turbine engines, WKiŁ Publishing House, Warsaw 1981.
• [2] Kowalski, M., Phase mapping In diagnosing of the two - rotor turbojet engine, Journal of Theoretical and Applied Mechanics, Vol. 50, No. 4, 2012.
• [3] Kowalski, M., An analysis of failure symptoms of the airscrew drive in PZL-130 TCI Orlik Aircraft, VETOMAC VIII International Conference on Vibration Engineering and Technology of Machinery, pp. 127-140, Gdansk, Poland 2012.
• [4] Kowalski, M., Use of data from on-board date recorders for acceptance tests of avionic driving units, Journal of KONES Powertrain and Transport, Vol. 20, No. 2, Warsaw 2013.
• [5] Kowalski, M., Issues of diagnostics for turbine avionic engines with use of data acquired by on-board recorders of flight parameters, Scientific Journals of ITWL, No. 31, Warsaw 2013.
• [6] Kowalski, M., Kozakiewicz, A., Unstable operation of the turbine aircraft engine, Journal of Theoretical and Applied Mechanics, Vol. 51, No. 3, pp. 719-727, 2013.
• [7] http://www.pt6nation.com/en/articles/article/best-of-the-pt6-nation-the-legend-tells-its-story/.