Zastosowanie czasowo-częstotliwościowej analizy sygnałów do badania niestatecznej pracy sprężarki promieniowej

• Autorzy: Horodko L.
• Języki publikacji: PL

Abstrakty

EN

The direct aim of this study is to elaborate and demonstrate certain research methods that yield a detailed description of flow phenomena, which cause a de crease in performance, or even darnages of compressors. The indirect aim is to provide the knowledge that applied in practical solutions enables one to prevent such phenomena. Instability of the compression system and local flow phenomena in a cen- trifugal compressor that precede instability are the subject of the investigation presented in the monograph. The time-frequency signal analysis, accomplished by means of the continuous wavelet transform, is the main tool of research used in the study. The wavelet cross-correlation function is another important method of the signal processing applied here. The sources of the signals under analysis were the experiments conducted on the test rig of the centrifugal compressor at the Institute of Turbomachinery , Technical University of Lodz, Poland. Pressure signals were simultaneously recorded from different compressor areas, while the compressor was slowly driven into surge by closing a throttling valve. A transition from compressor stable operation to surge was divided into four operation phases, based on the spectral structure of the pressure signal acquired upstream of the impeller. The last phase of operation, that is surge, was divided into six stages. Each phase of the stable operation, as well as each stage of surge, was ana- lysed thoroughly. The continuous wavelet transform was applied to show a timedependent spectral structure of signals, whereas the wavelet cross-correlation was used to identify rotating pressure waves and to estimate their velocity. Rotating pressure waves, identified for one of the surge stages, were used to build a simplified model of the circumferential distribution of static pressure in the impeller area. The method of generation of the signal that warns against surge is presented. This signal was obtained by demodulation of a pressure signal from the impeller area. The demodu- lation was accomplished with the same algorithm as used ton compute the continuous wavelet transform. The presented results of research lead to the final conclusion that the applied methods of signal analysis are useful and important tools in investigations of compressor instability.

Słowa kluczowe

PL

analiza czasowo-częstotliwościowa sygnałów; sprężarka promieniowa; niestateczność

• Wydawca: Wydawnictwo Politechniki Łódzkiej
• Czasopismo: Zeszyty Naukowe. Rozprawy Naukowe / Politechnika Łódzka
• Rocznik: 2006
• Tom: Z. 353
• Strony: 4--114
• Opis fizyczny: Bibliogr. 81 poz.

Twórcy

autor

Horodko L.

• Politechnika Łódzka. Instytut Maszyn Przepływowych. Zakład Metrologii Przepływów, ul. Wólczańskiej 219/223, 93-005 Łódź, Polend,

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