Temat: gas turbines, - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Vibration diagnostics of marine gas turbine engines
Autorzy:: Grządziela, A.
Charchalis, A.
Powiązania:: https://bibliotekanauki.pl/articles/244616.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: dynamics
gas turbines
rotor vibration
Opis:: Vibration tests of marine gas turbine engines are performed as researches on-line and off-line types. The paper presents analyses of both methods. Results of tests were received on three types of gas turbine engines operated in the COGAG type propulsion systems. The application of periodical diagnostic procedures or on-line monitoring systems makes it possible to operate ship propulsion systems in accordance with their current technical state. In the case of ship gas turbines the hourly period of scheduled maintenance or repair surveys is presently the criterion for maintenance time determination. The Finite Element Analysis (FEA) is used for confirmation actual technical state. FEA are used successfully for a wide range of problems and it may also be used for the modelling and analysis of rotor system. Presently, the diagnostics team uses FEA and the modelling of rotordynamics in conjunction with vibration analysis for detection and identification of unbalancing. Main goal of researches was qualified of helpfulness and unequivocally results received by methods of synchronous measurement, order tracking and auto tracking. All vibration symptoms were chosen from the methodology of the diagnosing gas turbine engines operated in the Polish Navy, called BDS (Base Diagnosing System). This element of BDS is accepted and used in all ships of Polish Navy, which are powered by the COGAG power plant. Second purpose of researches was estimation of the possibility of implementation presented methods of vibration analyses of gas turbine engines fornew, modern on-line monitoring system. The proposed diagnostics method makes it possible to determine the limiting value of vibration symptoms witch, if exceeded, indicates the inadmissible axis slope value between rotated machines of gas turbine engine and, more-over, it provides an unambiguous relationship between the value of symptom of rotors unbalance and the rotors rotational speed.
Źródło:: Journal of KONES; 2011, 18, 1; 157-162
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Diagnosing of rotor systems of marine gas turbine engines in nonstationary states
Autorzy:: Grządziela, A.
Powiązania:: https://bibliotekanauki.pl/articles/246906.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: dynamics
gas turbines
rotor vibration
run-up process
Opis:: Vibration tests of marine gas turbine engines are performed as researches on-line and off-line types. Systems on-line type generally monitored one or two vibration symptoms, which asses the limited and/or the critical values of parameters and they potentially can warn and/or shutdown engines. Systems off-line types are usually used for vibration analyzing during non-steady state of work. The paper presents comparison of different methods of analyzing vibration symptoms measured under run-up and shut-down processes of marine gas turbine engines. Results of tests were received on gas turbine engine DR76 type of the COGAG type propulsion system. The engine was not fitted with vibration monitoring system. Main goal of researches was qualified of help fulness and unequivocally results received by methods of synchronous measurement, order tracking and auto tracking. All vibration symptoms were chosen from the methodology of the diagnosing gas turbine engines operated in the Polish Navy, called BDS (Base Diagnosing System). Second purpose was estimation of the possibility of implementation presented methods of vibration analyses of gas turbine engines for on-line monitoring system. Application of periodical or on-line diagnostic procedures makes it possible to operate ship propulsion systems in accordance with their current technical state. The realization of the investigations made reliable verification of the investigation results possible.
Źródło:: Journal of KONES; 2010, 17, 2; 121-127
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Deviation angle models in off-design high-pressure turbines
Autorzy:: Bugała, P.
Powiązania:: https://bibliotekanauki.pl/articles/247825.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: turbomachinery
gas turbines
high-pressure turbine
HPT
deviation angle
Opis:: In the article, a set of deviation angle models, which are used to predict the off-design performance high-pressure turbines, has been presented, basing on a literature study. The deviation angle is a deviation between the actual flow angle and the blade inclination angle. It is an essential parameter in turbine performance evaluation. This angle shall be obtained accurately in 1-D design and evaluation, so as to ensure the validity of blade profiling and calculation results. If deviation angle is ignored, the turbine will produce a lower change of tangential velocity, and consequently a lower torque, output work and enthalpy drop than intended by the designer. For this reason, the deviation angle model needs to be established. There exist a number of different deviation models, resulting in varying degrees of flow deviation when applied. In the article, correlations for gas outlet angle, dependent on the Mach number at outlet and determined by the blade loading towards the trailing edge has been presented. The main difficulty in establishing the deviation model is a continuity in defining the angle for all speed ranges (both subcritical and supercritical). Each of the models presented in the article deals with this problem in a different way. A few deviation models, briefly discussed in the article, are based on experimental data and one is based on analytical approach.
Źródło:: Journal of KONES; 2018, 25, 2; 69-74
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Review of loss models for high pressure turbines
Autorzy:: Back da Trindade, D.
Bugała, P.
Simone, D.
Powiązania:: https://bibliotekanauki.pl/articles/244992.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: turbomachinery
gas turbines
high-pressure turbine
HPT
loss model
Opis:: This article presents a literature review about the physical analysis of the loss models, which are used in offdesign procedure for high-pressure turbines. A high-pressure turbine is designed to have maximum performance at design point. However, engines are operating in different conditions, and the comprehension of off-design conditions is very important. The loss mechanisms are very complex and predictions considering empirical methods are a good approach to have preliminary results. Based on these results, different researches have proposed theories about the loss mechanisms, and over the time, these models have been modified to describe better the phenomena involved between blades and flow. Once the physical mechanisms behind the loss models are known, it is possible to compare them and understand the reason why the results given for some methods present a higher agreement to experimental or numerical data. In this framework, 2D numerical simulations of the flow around the blades of an axial high pressure turbine with different off design conditions have been realized, by using ANSYS FLUENT® code, to show the losses described by some of these models. Using these simulations a loss model has been selected and implemented in Matlab® to compare its results with the experimental data found in literature.
Źródło:: Journal of KONES; 2018, 25, 2; 38-44
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: An application of order tracking procedure for diagnosis technical state of rotor system in shut - down process
Autorzy:: Grządziela, A.
Kluczyk, M.
Powiązania:: https://bibliotekanauki.pl/articles/242634.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: dynamics
vibration
gas turbines
rotor vibration
shut-down process
order analysis
Opis:: Vibration diagnostic tests of marine gas turbine engines are performed as a research of on-line and off-line types. On-line systems generally monitored one or two vibration symptoms, which asses the limited and/or the critical values of parameters and they, potentially, can warn and/or shutdown engines. Off-line Systems are usually used for vibration analysis during non-steady state of work. The paper presents a new method of vibration diagnostics of rotor bearing system of gas turbine systems. The study assumes implementation of characteristics of vibration signals during the shut-down process of the rotor. The shut-down process is non-stationary so the studies used the order tracking procedure. Identified orders constitute individual characteristics as a function of changes of the rotational speed and shut-down process time. These allow the observation of changes in the support rigidity of the rotor in the frequency domain and change the bearing resistance torque as a function of changing time of the shut-down process. The resulting characteristics are as reference fingerprints for each of the rotors. Changes in the characteristics of the primary evidence of the processes of wear. Changes in the stiffness of rotor supports make change the amplitude of orders and frequency of the resonance signals observed in the frequency domain - decreasing rotational speed. The bearing wear results in changes in the shut-down time between successive intervals of characteristic rotational speed and the total shut-down time.
Źródło:: Journal of KONES; 2013, 20, 1; 111-118
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Analysis possibilities of cost reduction related to boil-off fuel gas being carried on LNG gas carriers
Analiza możliwości redukcji kosztów związanych z odparowaniem przewożonego ładunku na gazowcach typu LNG
Autorzy:: Giernalczyk, M.
Powiązania:: https://bibliotekanauki.pl/articles/243187.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport morski
gaz naturalny
gazowce LNG
spalinowe silniki tłokowe
turbiny gazowe
turbiny parowe
sea transportation
boil-off fuel gas
LNG carriers
diesel engines
gas and steam turbines
Opis:: Gas carried on LNG carriers is liquefaction gas at ambient pressure and temperature minus 163oC degree is subject to boil-off and causing increase in pressure. This phenomenon makes danger of explosion. The simplest possibility to circumvent the foresaid event is to release-liquefied gas to atmosphere. However, the mentioned way causes losses of cargo and air pollution. There is an option to re-condensate gas again nevertheless to do it extra energy is required. Method that is more rational is to use boil-off fuel gas as propulsion energy in diesel engines, gas and steam turbines. This paper describes exploitation costing of main propulsion on LNG carriers trying to find out the best solution. There are presented fuel gas supply system as well various type of engine driven by fuel gas. Moreover, author presents further design development of LNG carriers. Possibilities of cost reduction related to boil-off fuel gas, the Moss RS standard setup for gas reliquefaction system, example of dual fuel diesel engines and electric propulsion, basic design concept for two compressor units 100% type 6LP250-5S1, diagram of COGES system, thermal efficiencies for the different propulsion options, technical data of some present dual-fuel engines, as well two-stroke propulsion recommendations for LNG carriers are illustrated in the paper.
Źródło:: Journal of KONES; 2007, 14, 2; 153-160
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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