Improvement of torque and power characteristics of V-type diesel engine applying new design of Variable geometry turbocharger (VGT)

Abstract

Based on the new design concept in VGT the commercial turbocharger with vaneless turbine volute and two gas inlet casings was converted to an adjustable one. Modification assumed the processing of turbine housing and installation of the specially designed mechanism of adjustment. Prototype of variable geometry turbocharger with two gas inlet casings can be installed on V-type engine in the way when each row of cylinders will deliver exhaust gases to one of the gas inlet casting. In the new design concept the elements of adjustment was profiled in a special way to ensure the adjustment with maximum effectiveness. Adjustable turbocharger was tested on a motorless test bench and characteristics of variable geometry turbine were analyzed in a wide range of the gas flow rates. Only small fluctuations in turbine efficiency during adjustment were detected that is evidence of high gas dynamics performance of VGT. Based on experimental data the possibility to improve engine indices that are most impacted when VGT is used was made. Improvement of torque and power characteristics of diesel engine when turbocharger adjustment with vaneless turbine volute is used also presented.