TY - JOUR
T1 - Unsteady performance of a double entry turbocharger turbine with a comparison to steady flow conditions
AU - Copeland, Colin D
AU - Martinez-Botas, Ricardo
AU - Seiler, Martin
PY - 2012/3
Y1 - 2012/3
N2 - Circumferentially divided, double entry turbocharger turbines are designed with a dividing wall parallel to the machine axis such that each entry feeds a separate 180 deg section of the nozzle circumference prior to entry into the rotor. This allows the exhaust pulses originating from the internal combustion exhaust to be preserved. Since the turbine is fed by two separate unsteady flows, the phase difference between the exhaust pulses entering the turbine rotor will produce a momentary imbalance in the flow conditions around the periphery of the turbine rotor. This research seeks to provide new insight into the impact of unsteadiness on turbine performance. The discrepancy between the pulsed flow behavior and that predicted by a typical steady flow performance map is a central issue considered in this work. In order to assess the performance deficit attributable to unequal admission, the steady flow conditions introduced in one inlet were varied with respect to the other. The results from these tests were then compared with unsteady, in-phase and out-of-phase pulsed flows most representative of the actual engine operating condition.
AB - Circumferentially divided, double entry turbocharger turbines are designed with a dividing wall parallel to the machine axis such that each entry feeds a separate 180 deg section of the nozzle circumference prior to entry into the rotor. This allows the exhaust pulses originating from the internal combustion exhaust to be preserved. Since the turbine is fed by two separate unsteady flows, the phase difference between the exhaust pulses entering the turbine rotor will produce a momentary imbalance in the flow conditions around the periphery of the turbine rotor. This research seeks to provide new insight into the impact of unsteadiness on turbine performance. The discrepancy between the pulsed flow behavior and that predicted by a typical steady flow performance map is a central issue considered in this work. In order to assess the performance deficit attributable to unequal admission, the steady flow conditions introduced in one inlet were varied with respect to the other. The results from these tests were then compared with unsteady, in-phase and out-of-phase pulsed flows most representative of the actual engine operating condition.
UR - http://www.scopus.com/inward/record.url?scp=79959803770&partnerID=8YFLogxK
UR - http://dx.doi.org/10.1115/1.4003171
U2 - 10.1115/1.4003171
DO - 10.1115/1.4003171
M3 - Article
SN - 0889-504X
VL - 134
JO - Journal of Turbomachinery: Transactions of the ASME
JF - Journal of Turbomachinery: Transactions of the ASME
IS - 2
M1 - 021022
ER -