Characterization of the Performance of a Turbocharger Centrifugal Compressor by Component Loss Contributions (original) (raw)
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Journal of Engineering Science and Military Technologies, 2017
In this study an effort was made to develop a flow simulation modeling and performance prediction for a centrifugal compressor stage of a heavy-duty D. I. diesel engine. The model is implemented in simulation software in MATLAB language. Additionally, a contribution of this paper to demonstrate that off-design performance of a centrifugal compressor stage in a turbocharger system can be accurately simulated using commercial CFD software, with design software, FLOEFD to generate high quality meshes and model solving. The vector plots, contour plots and stream line plots are generated for better understanding of fluid flow through centrifugal compressor stage. Correlation coefficients have been introduced in the calculation program, in order to be closer to the CFD simulation results. The results obtained from mathematical computation model were validated with the CFD analysis and experimental results performed using a test bench for the variation of the performance parameters such as isentropic efficiency, power input, and total pressure ratio with mass flow rate, the results are also presented in graphical form. The results reveal that reasonable agreement between mathematical models, the numerical results obtained from the CFD simulations and the real measurements; the maximum difference never exceeds 5%. The results indicate that the developed mathematical computation model can yield better predictions of performance for a centrifugal compressor stage in a turbocharger system.
Centrifugal Compressor Analysis by CFD
2014
In order to obtain more power from the engine, a new and larger turbocharger is being used. This paper is the culmination of the complete fundamental study of air flow physics. The purpose of this project is to analyze a centrifugal compressor in a turbocharger system of a diesel engine. Turbochargers are extensively used throughout the automobile industries as they can enhance the output of an internal combustion (IC) engine without the need to increase its cylinder capacity. This paper deals with the computational fluids dynamics analysis of flow in high speed turbocharger.
A test rig has been built for determining a centrifugal compressor impeller flow field characteristic parameters. The compressor is working with a gas turbine engine of type 4M-1 (APU), which has a maximum speed of rotation of 27600 rpm. The engine shaft was being driven by a variable speed electric motor as a cold running test of the engine. The total and static pressures, and temperatures were measured at the impeller inlet, outlet, and in the collector, as well as the speed of rotation and mass flow rates. Whereas, the impeller efficiency, slip factor and aerodynamic blockage were calculated at every measured point. The mass flow rate has been varied by using a throttling gate, from its maximum to nearly surge point at each speed, where the surge symptoms start to appear. The mass flow rates and the speeds of rotation are corrected according to the standard ambient pressure and temperature. A loss model was developed using the basic fluid equations aided by some empirical relatio...
Design, Plant Test and CFD Calculation of a Turbocharger for a Low-Speed Engine
Applied Sciences, 2020
Various approaches and techniques are used to design centrifugal compressors. These are engineering one-dimensional and quasi-three-dimensional programs, as well as CFD Computational Fluid Dynamics (CFD) programs. The final judgment about the effectiveness of the design is given by testing the compressor or its model. A centrifugal compressor for an internal combustion engine turbocharger was designed jointly by the Research Laboratory “Gas Dynamics of Turbomachines” of Peter the Great St. Petersburg Polytechnic University (SPbPU) and RPA (Research and Production Association) “Turbotekhnika”. To check its dimensionless characteristics, the compressor was tested with two geometrically similar impellers with a diameter of 175 (TKR 175E) and 140 mm (TKR 140E). The mathematical model of the Universal Modeling Method calculates the efficiency in the design mode for all tests of both compressors with an error of 0.89%, and the efficiency for the entire characteristic with an error of 1.55...
THERMODYNAMIC DESIGN OF CENTRIFUGAL COMPRESSOR FOR TURBOCHARGER
The purpose of a turbocharger is to increase the power output of an engine by supplying compressed air to the engine intake manifold so that fuel can be burnt efficiently. In this work, thermodynamic design of a high pressure ratio centrifugal compressor, for 75 kW class engines, was carried out. A pressure ratio of 2.8 was considered with a compressor rotational speed of 60,000 RPM. The compressor was designed for vane less diffuser. The impeller designs were obtained using circular method, with six divisions. The CAD models were built using CATIA. The geometry was then tested using Computational Fluid Dynamics (CFD) simulations to verify the thermodynamic based design.
A Review on Centrifugal Compressor Design Methods
The use of turbochargers has increased in response to strengthened automotive exhaust emission and fuel consumption regulations for global environmental protection. Most centrifugal compressors are required to operate over a broad range of flow rates and to provide a high pressure ratio with high efficiency. The internal flow of a centrifugal compressor is very problematic with 3-dimensional and unsteady flow phenomena, and the analysis of flow phenomena and expansion of the operational range are difficult problems. Review is done for gathering the efficient method for designing and analyzing the centrifugal compressor. In order to meet these demands the application of variable geometry techniques is often considered and applied.
EXPERIMENTAL ANALYSIS AND CFD SIMULATIONS OF A TURBOCHARGER COMPRESSOR
In this study, the performance of a turbocharger compressor was investigated via experimental testing and 3-D CFD simulations. The SFR1015 Turbocharger manufactured at Saffer Turbocharger in Turkey was tested experimentally under steady flow conditions. The performance map of the compressor was produced by using the test data for rotational speeds of the turbocharger between 60000 rpm and 150000 rpm. As a critical region for stable operation of the turbocharger, the surge line on the map was carefully determined. CFD simulations were carried out using Star-CCM+ software for four different operating points at the speed of 120000 rpm. The experimental analysis and CFD results under steady flow conditions show good agreement at lower flow rate with more uncertainty at higher flow speeds. Furthermore, CFD analyses showed that different geometry designs can be considered to improve the compressor performance.
Volume 1: Compressors, Fans and Pumps; Turbines; Heat Transfer; Combustion, Fuels and Emissions, 2017
Modern Internal combustion engines require high pressure ratios to perform efficiently as well as to reduce emissions. For such applications, a centrifugal compressor with high pressure ratio and broader operating range may be employed. The impeller design of such compressors plays a vital role in producing the efficient operation and hence today’s research focus rigorously over its design. The objective of the current investigation is to study the performance of centrifugal compressors based on variation in exit width, eye tip radius and shroud extension. Shroud extension have previously found to generate higher pressure rise at the same time have the least amount of losses. The pressure ratio, power and torque requirement, isentropic efficiency and thermal aspects were the main considerations for the study.
International Journal of Performability Engineering, 2018
Turbocharger is used to increase the efficiency of an engine. In the turbocharger, a centrifugal compressor is used. Centrifugal compressor failure has been a main issue in recent years. The failure of the centrifugal compressor is because of surge and stall. Surge occurs because pressure at the receiver is greater than the pressure at the compressor. So, gas flow will reverse and surge occurs. This work-study is based on reducing surge and stall. We can prevent the tendency of surge and stall by changing the factors affecting the change in pressure. We can change the pressure by changing the density of gas, number of impellers, impeller diameter, inlet and volute geometry and flow regulation. Hence, in this paper, we perform the CFD analysis of the centrifugal compressor by changing the geometry.
유체기계 연구개발 발표회 논문집, 2015
The prediction and design of the aerodynamic performance of a compressor are crucial requirements to properly evaluate the aerodynamic performance and characteristics during preliminary design of a centrifugal compressor because it is not clear to figure out the internal flow property of a compressor including complicated three dimensional turbulent flow. In this study the industrial centrifugal compressor was calculated for variations of mass flow and blade Mach number with 2 cases of different number of diffuser vanes. One of the major cause of the impeller loss is the pressure drop when the operating mass flow rate closes to choking flow coefficient. Momentum transfer and loss characteristics of the impeller are important to understand impeller characteristics. The method was suggested to estimate the impeller performance characteristics.