The model of a hyperboloid shaped object was measured by means of 2D Particle Image Velocimetry in the Wind Tunnel with simulated atmospheric boundary layer. The model was tested in a subcritical range of Reynolds number. Various planes in a wake of the model were captured. One was set in the model axis and perpendicular to the ground and the averaged velocity field of this measurement revealed a possible arch vortex behind the model. Next, several planes perpendicular to the ground were measured. The averaged velocity field showed two symmetrical formations. From these measurements, the shape of the arch vortex was estimated.
Abstract. This paper deals with flow around a bluff body of hyperboloid shape. It combines results gathered in the course of research by means of Particle Image Velocimetry (PIV). The experiments were carried out by means of low-frequency 2D PIV and the Reynolds number was 43 000.
This work deals with numerical simulation of complete cooling system of internal combustion engine (GT-SUITE), which also involves the simulation of flow in underhood using the computationally undemanding simulation. A detailed model of the internal combustion engine is extended to a cooling circuit model which is then coupled to a simplified underhood model which is created with the help of GT-COOL application as a 3-D model and afterwards transferred to a 1-D form. The approaches, one using 1-D solution of arrangement of the heat exchangers and the other 3-D approach using the underhood model, were investigated in two steady states corresponding to various vehicle speeds and engine load. These simulations have shown the inappropriateness of 1-D approach when solving the flow in the heat exchangers in the underhood and helped to explore a relatively undemanding method of flow simulation in the underhood, which enables to detect the interaction between the models of the cooling system and the internal combustion engine and the issue of arrangement of the heat exchangers in the underhood. a given assembly and 3D modelling of such assembly ([9], [10]). The combination of these methods enables, with the knowledge of basic physical relations between individual volumes and on the basis of additional discretization, to calculate the overall energy balance. The resultant energy balance is determined as a solution of system of one-dimensional tasks in each element where at each point the validity of basic equations, such as continuity equation, momentum equation and more, must be maintained. This work deals with the last-mentioned method. The aim of the work is to create a complex model of the underhood. The aim is to study, with the help of 1D and 3D simulation, not only the impact of the particular rate of discretization and simplification of the given underhood model on the cooling process, but also to focus on regimes related with the balance state of engine during on hot summer months, at low vehicle speeds.
KEYWORDS: UNDERHOOD FLOW, ENGINE COOLING, RADIATOR, AIR CONDITION, 1-D SIMULATION
INFLUENCE OF UNDERHOOD FLOW ON ENGINE COOLING USING 1-D AND 3-D APPROACH
Abstract. An estimation of a measurement accuracy at each measured point is crucial regarding the applicability of results of the measurements. The aim of this work is to determine the correlation between individual metrics and the measurement accuracy by using corrected metrics of the correlation plane. This work is based on defining a corrected metric using known metrics corrected by the displacement measured in the last iteration, the number of the particles and the velocity gradient inside the interrogation area. The resulting tests are performed using conventional synthetic tests. The discovered dependencies between individual corrected metrics are subsequently approximated in order to determine the measurement accuracy. And, finally, the most suitable variant for the determination of the accuracy of the measurement by the particle image velocimetry method is specified.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.