Zbornik radova Koridor 10 - Kirilo SaviÄ

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3rd International Scientific and Professional Conference CORRIDOR 10 - a sustainable way of integrations Figure 8: Comparison of train paths before and after track possession (timetable chart) The bold line in the figure depicts train path (time) before the application of track possession while the thin one the train path after the track has been closed. The figure shows train 3112 arriving delayed to the Ljubljana station. 5. CONCLUSIONS Analysis of impacts traffic disruptions caused by track possessions or downtime is very important for efficient train operation concept in order to limit unnecessary propagation of negative effects to train schedule. The train operation concept must be developed in the “Elaborate on railway traffic operations during constructions works”. Correct and precise planning of railway traffic operations during track possessions or planned slow run can be performed aided by engineering software tools that are capable of calculation transport production parameters, as delay, line capacity, run-time etc., underlying calculation of costs resulting from traffic disruptions. Delays, required alternative transportations, additional operation staff that ensue from software tool analyses make trustworthy and reliable basis to produce a sound planning and evaluation of railway infrastructure investments. 6. REFERENCES [1] RailSys: User Manual, May 2012, pp. 366-378 [2] Tehnologija odvijanja prometa na postaji Ljubljana v času izvajanja del v okviru projekta Emonika, Prometni institut Ljubljana d.o.o, Ljubljana, 2012 Belgrade, 2012 219
3rd International Scientific and Professional Conference CORRIDOR 10 - a sustainable way of integrations RESEARCH SOME AERODYNAMICS PHENOMENON OF HIGH- SPEED TRAINS IN LOW-SPEED WIND TUNNEL Mirjana Puharić, Ph.D, Institute Kirilo Savić, , Belgrade, Serbia Vojkan Lučanin, M.Sc., Faculty of mechanical engineering, Belgrade University, Serbia Suzana Linić, B.Sc, Institute GOŠA, Belgrade, Serbia Dušan Matić, B.Sc, Institute GOŠA, Belgrade, Serbia ABSTRACT This paper describes the use of low-speed aerodynamic tunnel testing of phenomena that occur during movement of trains. The first part of the study include experimental research of model trains, carried out in low speed wind tunnel. Model train, which was made in scale 1:20, was tested. The aerodynamic pressure on the train model, which is generated by the movement of the train, was measured. Velocity of the train has been 180 km/h. Research contains measurement of the pressure distribution on the train model using holes for measuring pressure and pressure sensors. Pressure sensors are connected with multiplexer pressure type Scanivalve using plastic pneumatic tubes. The second part of this study includes numerical calculation using methods CFD - Computational Fluid Dynamics - Fluent. The numerical calculation is based on the finite volume technique. Fluent was used to predict the parameters of the flow field of high-speed train. The results of the experiment and pressures predicted by CFD for the same conditions were compared. Keywords: high-speed train, aerodynamic, wind tunnel, Fluent, pressure scanning system, differential pressure gauge, sensors for measuring pressure ISTRAŽIVANJE NEKIH AERODINAMIČKIH FENOMENA VOZOVA VELIKIH BRZINA U AERODINAMIČKOM TUNELU MALIH BRZINA U ovom radu opisana je primena aerodinamičkih tunela malih brzina u ispitivanjima fenomena koji se javljaju pri kretanju vozova. Prvi deo studije obuhvata eksperimentalna istraživanja modela voza, koja su izvršena u aerodinamičkom tunelu malih brzina. Ispitivan je model voza, izrađen u razmeri 1:20. Na modelu voza je meren aerodinamički pritisak nastao prolaskom voza. Brzina voza je 180 km/h. Istraživanja obuhvataju merenje raspodela pritisaka na modelu voza, pomoću rupica za merenje pritisaka i davača pritiska. Davači pritiska su pneumatskim cevčicama povezani sa multiplekserom pritisaka tipa Scanivalve. Drugi deo ovog ispitivanja obuhvata numerički proračun pomoću CFD metode, kompjuterska dinamika fluida – Fluent. Numerički proračun je zasnovan na tehnici konačnih zapremina. Fluent je korišćen za određivanje parametara strujnog polja kod voza velikih brzina. Rezultati eksperimenta su poređeni sa pritiscima dobijenim CFD metodom za iste uslove. Ključne reči: vozovi velikih brzina, aerodinamika, aerotunel, Fluent, sistem za merenje pritisaka, diferencijalni davač pritiska, senzori za merenje pritisaka Belgrade, 2012 220
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Zbornik radova Koridor 10 - Kirilo SaviÄ