http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Modelling the flow conditions in the tunnel and its reduced model
Mária Čarnogurská,Miroslav Příhoda,Daniela Popčáková 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.12
The article discusses the problems of flow condition modelling on real object as well as its reduced model while using similarity theory. Similarity criteria and model flow laws are derived by means of dimensional analysis. Presented is the computation of flow through the tunnel and its reduced model as well as the applied numerical methods.
Mária Čarnogurská,Miroslav Příhoda,Jiří Molínek 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.11
An original method for estimating fouled deposit thickness on the inside surfaces of natural gas cooler tubes is presented. This method does not require opening and inspecting a cooler as it is based on the measurement of gas cooling degree, i.e. the gas temperature difference between the cooler inlet and discharge. The deposit layer on the internal heat transfer surfaces is of semi-liquid consistency and its thermal conductivity coefficient has not been investigated until now. This paper describes the experimental determination of the deposit thermal conductivity coefficient. This parameter enables determination of a cooler’s performance as a function of current deposit thickness. Practical application of the method is illustrated in the case of CH_R cooler working in the KS01 compressor station in Veľké Kapušany,Slovakia. For this type of cooler, a diagram for deposit thickness as a function of the gas cooling degree is presented.
Verification of pollutant creation model at dendromass combustion
Mária Čarnogurská,Miroslav Příhoda,Marcel Koško,René Pyszko 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.12
Results of verification of two mathematical models presenting the creation of three pollutants at wood combustion in a low power pellet boiler are published in this article. The type of boiler used in the experiment was EKO-KARBON ÚSPOR-AUTOMAT with nominal power of 18 kW. Nitrogen oxides, carbon oxide, and total organic carbon were tested. The models elaborated on the basic theory of dimensional analysis. In the first model, the emissions produced in the wood combustion process were described under the condition that the combustion product temperature in boiler outlet is one relevant parameter in the mathematical model. Combustion air volume flow,combustion air temperature, combustion product temperature, boiler power, and wood calorific power are other parameters in the model. The second model describes the mutual coherence of the same pollutants, provided that flame temperature, instead of combustion product temperature, is incorporated into the model. The outputs obtained from both models are subjected to the same combustion conditions.
Mária Čarnogurská,Miroslav Příhoda,Tomáš Brestovič,Jiří Molínek,René Pyszko 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.1
The article describes a methodology for determination of permeability and inertial resistance coefficient of filter inserts used for the separation of solid and liquid impurities in natural gas. The parameters of the filter inserts are described by analytical relations and their real values are obtained experimentally. The realized experiment was focused on the measurement of the pressure drop in the insert, with which both permeability and inertial resistance coefficient were possible to be expressed. The experiment was performed on the reduced physical model of the filter separator, which was constructed at a scale of 1:127. During the experimental measuring the working medium was pressure air. In a real filter separator there is compressed natural gas used as the working medium. The reduced model, therefore, had to meet the basic requirement of similarity of flowing in the model and the real object, which was based on equality of the Reynolds criteria for the work and the model.