Showing 4 results for Turbocharger
Hamidreza Tabatabaei, Masoud Boroomand, ,
Volume 11, Issue 4 (9-2011)
Abstract
Abstract- Possibilities and limitations of 1D and 3D flow simulations in the vaneless turbocharger turbine of a 1.7 liter SI engine are presented experimentally and numerically. A test setup of the turbocharged engine on dynamometer is prepared to validate the results of numerical modeling. Various performance parameters are measured at 12 different engine speeds and the results of measurement in 3 different engine speeds are presented in this report. The complete form of the volute and rotor vanes is modeled. An extensive study on the number of meshes has been undertaken to ensure the independency to meshes. The modeling of rotating wheel is considered by Multiple Rotating Frames (MRF) technique. Finally, the variations of turbine performance parameters are studied under different pulse frequencies of the engine. The results show that at high engine speeds a 3D unsteady flow simulation is required to get reasonably accurate results. The results presented in current report will be used in simulating three dimensional steady and unsteady compressible flow within the turbine of the turbocharger.
Seyed Shahabeddin Alaviyoun, Masoud Ziabasharhagh,
Volume 17, Issue 12 (2-2018)
Abstract
In the past years many research efforts on turbocharger heat transfer have been performed, however, there are not enough investigations on unsteady condition of turbocharger. One of the unsteady condition is heat soak test. In this test, engine runs at maximum power until all temperatures are stabilized, then the engine stops suddenly. After the engine has been shut down, heat stored in the turbine housing soaks back into the bearing housing of the turbocharger. This heat can potentially destroy the bearing system and the oil-sealing piston rings. The aim of the paper is to investigate the effect of turbocharger temperature distribution in heat soak test and considering effect of electrical water pump on temperature distribution. Experimental investigation has been performed on gasoline engine turbocharger, which several thermocouples have been used on accessible surfaces of the turbocharger. Turbine, compressor and bearing housings temperature have been measured inside engine test cell. Moreover, temperature, pressure and flow rates of oil, water and air have been measured. Results of engine heat soak test with original cooling circuit, show that bearing housing temperature increases 60°C after engine shutdown and maximum temperature reaches 220°C. However, using electrical water pump after engine shutdown causes only 10°C incensement of bearing housing temperature.
Mohsen Agha Seyed Mirzabozorg, Saeid Kheradmand, Ali Roueini,
Volume 18, Issue 1 (3-2018)
Abstract
In this paper, a C-programming code is produced to introduce the best propulsion system including an internal combustion engine combined with turbochargers. Because the power of internal combustion engine will reduce as the altitude increasing, it is required to use one or more turbochargers in order to compensate the loss of power which is caused by reduced ambient air pressure. For this purpose, a code is written that will be able to introduce the best turbochargers combination including intercoolers, according to the target power and the desired altitude of the UAV flight. In other words, input required parameters of the code is the target power of the engine and desired altitude of flight and output of the code is number and characteristics of the turbochargers with their exact manufacturing company names and also the number of intercoolers required for best performance of propulsion system. It should be noted that, if the turbochargers that is chosen by the program are not available, user can select of the similar turbochargers with similar characteristics without any significant difference in performance of the propulsion system.
M.h. Shojaeifard, A. Sajedin, A. Khalkhali,
Volume 19, Issue 11 (11-2019)
Abstract
Turbocharger turbine blade thickness is restricted by blockage and trailing edge losses and it is exposed to damage due to aerodynamic loads. Proper designing of the blade needs to full recognition of loads on the blade. Therefore, the force from the fluid to the blade should be calculated. Although, thickening the blade results to the more resistance to fracture and cracks, but it affects the aero-structural performance of each section of the blade differently. So, turbocharger turbine blades are exposed to pulsating flow which should be considered in thickness distribution selection. This article reports a comprehensive fluid-solid interaction study of the turbine blades with different thickness distribution which could beneficially investigates the effect of each part thickness on the aerostatic efficiency. Leading edge and trailing edge thickness, maximum thickness and its location, trailing edge shape, hub, and tip blade thickness were the variables which their effects were investigated. Using dual turbocharger turbines leads to lower dissipation of kinetic energy of pulsating charge from the engine. In such turbines, each sector of rotor accepts a different charge from upper and lower entries. The flow distribution of every passage is the difference from the others. Therefore, to the evaluation of the flow, modeling of the entire turbine is needed. 3D CFD model in ANSYS CFX for fluid side and an FEA model in ANSYS Static Structural module for the blade structural responses were used then the results were coupled. Validation was performed by reference to experimental data carried out in imperial college London on a dual turbocharger turbine.
