Two Stage Turbocharger Test Rig Development and Performance Tests

Two-stage turbo-charger test rig has been designed and built to validate multi-stage turbocharger system design / analysis method developed in KARI. Two turbo-chargers are serially connected and there is an intercooler after the low pressure turbocharger compressor to reduce volumetric flow rate of the working fluid. Test result showed that compressor operating points successfully reached the predicted operating points located near the high efficiency islands of the compressor performance maps. It means two turbo-chargers are aerodynamically well matched. Also performance of air to water intercooler exhibited more than predicted aerodynamic performance as well as heat exchange efficiency. Also test result suggested a clue that there could be optimum aerodynamic matching between turbocharger compressor and intercooler for further improvement of the turbocharger system performance.