Browsing by Subject "gas flow"

Now showing 1 - 3 of 3

Access status: Open Access ,
Developing a new approach in diagnostic methods of technical state of propeller of gas pumping unit
(2013) Zamìhovs'kij, Leonìd Mihajlovič; Ìvanûk, Natalìâ Ìvanìvna
To estimate the influence of changes in aerodynamic and shape characteristics of propellers of the gas pumping unit on process variables of gas pumping unit using the mathematical modeling methods. The method theoretically based Fredholm equation of the second kind for the tangential velocity component, its computational solution, and estimation of aerodynamical characteristics of airfoil of blades in special chosen frame of reference depending on the airfoil and attack angle. For the estimation of influence of shape configuration changes, which are determined by the configuration of blades of propeller on vibration characteristics of blades, cross-sectional area of blades and its second moment the numerical methods are used. Different methods of reproducing of shape configuration of airfoil of blades using experimental data of coordinates of relevant set points of airfoil are considered. Theoretical results could be used in the research and estimation of influences of configuration blade change and quantity of strained blades on the productivity of pumping units. The conducted research and its results can be the basis of creating of new non-destructive testing methods for gas pumping units and creating a new system of control. Shown results allow increasing operational reliability of facilities that were under research and systems, which can be helpful for Ukrainian gas and oil industry facilities.
Access status: Open Access ,
Komputerowa symulacja stanu naprężenia w sąsiedztwie wyrobiska górniczego z uwzględnieniem przepływu gazu
(Wydawnictwa AGH, 2010) Walaszczyk, Jan; Florkowska, Lucyna
One of the natural dangers in coal mining in Poland is methane migration between rock layers. The following paper discusses that issue. The main aim of the paper was to obtain stress distribution around mining excavation area, considering the influence of methane pressure and the process of methane migration through gaps into layers previously without it. In particular, the paper presents a simulation of processes occurring in rock mass during coal exploitation when the migration of methane from lower layers is possible. The issue was solved by numerical modelling, using the Finite Element Method. MES-Abaqus code was used for calculations.
Access status: Open Access ,
Pomiary natężenia przepływu
(2007) Rybicki, Czesław; Łuczyński, Stanisław
The quantitative measurement of gas in the master pipelines or distribution pipelines is usually made on gas stations. Three types of gas meters were characterized in the paper along with their principle, range of application and accuracy of measurement. The following types of gas meters were discussed: - Contraction gas meters, - Turbine gas meters, - Rotary gas meters, - Bellows gas meters, - Ultrasound gas meters, - Gas meters based on Coriolis force, - Thermal gas meters, - Optic gas meters. The authors stressed that the gas meter should be selected on the basis of the range of measurement and also certain specific parameters, which can be either advantageous or disadvantageous. The positive and negative features of the most frequently applied flow meters were presented on the basis of literature data.