A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Experimental Investigation on the independent effects of Inlet Flow Angle and Inlet Flow Area for Variable Geometry Turbocharger Turbine
A turbocharger is an exhaust driven machine which increases intake air density for internal combustion engine, consequently enabling power enhancement, downsizing and overall efficiency improvements. A turbocharger turbine is characterized by its geometry, either fixed or variable. In a Variable Geometry Turbocharger (VGT), the turbine geometry can be changed by using two parameters that rule its flow conditions – inlet flow angle and inlet flow area. However, almost all the commercially available VGTs only have the ability to control either one of these parameters, thus their independent effects on a turbocharger performance could not be investigated. Precisely for this reason a new VGT has been designed with mechanism that enables independent control of both the inlet flow angle (through pivoting) and inlet flow area (through sliding ring positioning). This paper presents an experimental investigation with a turbocharger turbine with different inlet flow angles and inlet flow areas, with the aim to enhance exhaust energy extraction. The results will be compared to the ones obtained using a Pivoting Vane VGT for the same turbine, which is considered as the baseline. The investigation focuses on how the two main turbine inlet parameters, independent to each other, affect the efficiency and swallowing capacity. This will provide information to design a better variable geometry turbocharger that could maintain high performance throughout its entire operational regime. The newly designed variable geometry turbine was tested under steady flow conditions for 3 rotor speeds – 18000 rpm, 36000 rpm and 54000 rpm – covering a wide range of loadings. More than 30 different set - points were tested covering a wide range combination of Vane Angles and Sliding Ring Positions. Experimental results show that very similar efficiencies can be achieved for different configurations with the same swallowing capacity. These configurations showed the importance of misalignment angle (defined as the difference between the volut e exit angle and the vane angle) and the incidence angle for turbine efficiency. On every set of testing where the configuration produces the same swallowing capacity, the peak efficiency is achieved where the misalignment angle is closer to zero, practically independently of the vane angle (ranging from 40° up to 75°). This effectively indicates that turbine operational governing based on area changes, by ignoring the inlet flow angle, as in the practice of conventional pivoting vane turbine, is penalizing the performance of a turbocharger
Experimental Investigation on the independent effects of Inlet Flow Angle and Inlet Flow Area for Variable Geometry Turbocharger Turbine
A turbocharger is an exhaust driven machine which increases intake air density for internal combustion engine, consequently enabling power enhancement, downsizing and overall efficiency improvements. A turbocharger turbine is characterized by its geometry, either fixed or variable. In a Variable Geometry Turbocharger (VGT), the turbine geometry can be changed by using two parameters that rule its flow conditions – inlet flow angle and inlet flow area. However, almost all the commercially available VGTs only have the ability to control either one of these parameters, thus their independent effects on a turbocharger performance could not be investigated. Precisely for this reason a new VGT has been designed with mechanism that enables independent control of both the inlet flow angle (through pivoting) and inlet flow area (through sliding ring positioning). This paper presents an experimental investigation with a turbocharger turbine with different inlet flow angles and inlet flow areas, with the aim to enhance exhaust energy extraction. The results will be compared to the ones obtained using a Pivoting Vane VGT for the same turbine, which is considered as the baseline. The investigation focuses on how the two main turbine inlet parameters, independent to each other, affect the efficiency and swallowing capacity. This will provide information to design a better variable geometry turbocharger that could maintain high performance throughout its entire operational regime. The newly designed variable geometry turbine was tested under steady flow conditions for 3 rotor speeds – 18000 rpm, 36000 rpm and 54000 rpm – covering a wide range of loadings. More than 30 different set - points were tested covering a wide range combination of Vane Angles and Sliding Ring Positions. Experimental results show that very similar efficiencies can be achieved for different configurations with the same swallowing capacity. These configurations showed the importance of misalignment angle (defined as the difference between the volut e exit angle and the vane angle) and the incidence angle for turbine efficiency. On every set of testing where the configuration produces the same swallowing capacity, the peak efficiency is achieved where the misalignment angle is closer to zero, practically independently of the vane angle (ranging from 40° up to 75°). This effectively indicates that turbine operational governing based on area changes, by ignoring the inlet flow angle, as in the practice of conventional pivoting vane turbine, is penalizing the performance of a turbocharger
Experimental Investigation on the independent effects of Inlet Flow Angle and Inlet Flow Area for Variable Geometry Turbocharger Turbine
Fores, Jose F. Cortell (author) / Martinez-Botas, Ricardo (author) / Rajoo, Srithar (author)
2018-05-07
Conference paper
Electronic Resource
English
DDC:
690
| British Library Online Contents | 1998