It is necessary to characterize fuel economy of hybrid electric vehicles (HEVs) at balanced energy content of the electric storage devices (ES) to enable credible comparison of different vehicle configurations. The paper solves this issue by outlining and validating an innovative analytically based method to calculate corrected fuel consumption of parallel and series HEVs at balanced energy content of the ES out of a single run.
COBISS.SI-ID: 11450907
This paper presents the impact of guard grill on aerodynamic integral characteristic, the spectrum of sound pressure level and total sound power level at four characteristic operating points. The measurement results of the local velocity of the axial fan without guard grill at optimal operating point were used to model the optimized guard grill contour. The guard grill of axial fan has a significant impact on aerodynamic integral characteristic. The influence of guard grill is also characteristically reflected in the spectrum of sound pressure level via vortex shedding frequency.
COBISS.SI-ID: 11386907
In this paper, we present an experimental and numerical investigation of a single-stage centripetal pump (SSCP). The measured performance curves are characterized by a hysteresis, since the throttle-closing performance curves do not correspond to the throttle-opening performance curves throughout the whole operating range The flow conditions obtained with the CFD simulations confirm that the hydraulic behavior of the SSCP is influenced by the partial circumferential stall that occurs in the impeller-stator flow channels.
COBISS.SI-ID: 11296027
Fuel economy of heavy-duty hybrid electric vehicles (HEVs) is significantly influenced by HEV topologies, power ratios and characteristics of the components, applied control strategies, vehicle weights and payloads as well as by the drive cycle characteristics. Based on the innovative combined analytical and simulation approach the paper reveals and analyzes mechanisms that lead to the optimized fuel economy of hybrid-electric heavy-duty vehicles considering the before mentioned degrees of freedom. Furthermore, cross-influences between different mechanisms are analyzed and explained.
COBISS.SI-ID: 11617307
The paper presents an experimental study of suspension flow patterns and velocity field inside a circular settling tank. The flow field and local suspension concentration was determined by computer-aided visualization. Sedimentation efficiency was assessed relatively by comparison of the amount of settled particles (sludge height measurements) between different types of flow in a certain time period of the settling tank operation. Results showed that there were two types of flow in the settling tank that were initiated by a horizontal or vertical inflow from the distribution ring.
COBISS.SI-ID: 11402267