The effect of unequal admission on the performance and loss generation in a double-entry turbocharger turbine

Colin Copeland, Peter Newton, Ricardo Martinez-Botas, Martin Seiler

Research output: Chapter in Book/Report/Conference proceedingConference contribution

14 Citations (Scopus)

Abstract

The current work investigates a circumferentially-divided turbine volute designed such that each gas inlet feeds a separate section of the turbine wheel. Although there is a small connecting interspace formed between the nozzle and the mixed flow rotor inlet, this design does well to preserve the exhaust gas energy in a pulsed-charged application by largely isolating the two streams entering the turbine. However, this type of volute design produces some interesting flow features as a result of unequal flows driving the turbine wheel. To investigate the influence of unequal flows, experimental data from the turbocharger facility at Imperial College has been gathered over a wide range of steady-state, unequal admission conditions. These test results show a significant drop in turbine performance with increasing pressure difference between inlets. In addition, the swallowing capacities of each gas inlet are interdependent, thus indicating some flow interaction between entries. To understand the flow physics driving the observed performance, a full 3-D CFD model of the turbine was created. Results show a highly disturbed flow field as a consequence of the non uniform admission. From these results, it is possible to identify the regions of aerodynamic loss responsible for the measured performance decrease. Given the unequal flows present in a double-entry design, each rotor passage sees an abrupt change in flow conditions as it rotates spanning the two feeding sectors. This operation introduces a high degree of unsteady flow into the rotor passage even when it operates in steady conditions. The amplitude and frequency of this unsteadiness will depend both on the level of unequal admission and the speed of rotor rotation. The reduced frequency associated with this disturbance supports the evidence that the flow in the rotor passage is unsteady. Furthermore, the CFD model indicates that the blade passage flow is unable to fully develop in the time available to travel between the two different sectors (entries).
LanguageEnglish
Title of host publicationASME Turbo Expo 2010
Subtitle of host publicationPower for Land, Sea, and Air (GT2010)
Place of PublicationNew York, U. S. A.
PublisherASME
Pages1733-1745
ISBN (Print)9780791844021
DOIs
StatusPublished - 2010
EventASME Turbo Expo 2010: Power for Land, Sea, and Air, GT 2010, June 14, 2010 - June 18, 2010 - Glasgow, UK United Kingdom
Duration: 1 Jan 2010 → …

Conference

ConferenceASME Turbo Expo 2010: Power for Land, Sea, and Air, GT 2010, June 14, 2010 - June 18, 2010
CountryUK United Kingdom
CityGlasgow
Period1/01/10 → …

Fingerprint

Turbines
Rotors
Wheels
Computational fluid dynamics
Flow interactions
Intake systems
Unsteady flow
Exhaust gases
Gases
Nozzles
Flow fields
Aerodynamics
Physics

Cite this

Copeland, C., Newton, P., Martinez-Botas, R., & Seiler, M. (2010). The effect of unequal admission on the performance and loss generation in a double-entry turbocharger turbine. In ASME Turbo Expo 2010: Power for Land, Sea, and Air (GT2010) (pp. 1733-1745). New York, U. S. A.: ASME. https://doi.org/10.1115/GT2010-22212

The effect of unequal admission on the performance and loss generation in a double-entry turbocharger turbine. / Copeland, Colin; Newton, Peter; Martinez-Botas, Ricardo; Seiler, Martin.

ASME Turbo Expo 2010: Power for Land, Sea, and Air (GT2010) . New York, U. S. A. : ASME, 2010. p. 1733-1745.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Copeland, C, Newton, P, Martinez-Botas, R & Seiler, M 2010, The effect of unequal admission on the performance and loss generation in a double-entry turbocharger turbine. in ASME Turbo Expo 2010: Power for Land, Sea, and Air (GT2010) . ASME, New York, U. S. A., pp. 1733-1745, ASME Turbo Expo 2010: Power for Land, Sea, and Air, GT 2010, June 14, 2010 - June 18, 2010, Glasgow, UK United Kingdom, 1/01/10. https://doi.org/10.1115/GT2010-22212
Copeland C, Newton P, Martinez-Botas R, Seiler M. The effect of unequal admission on the performance and loss generation in a double-entry turbocharger turbine. In ASME Turbo Expo 2010: Power for Land, Sea, and Air (GT2010) . New York, U. S. A.: ASME. 2010. p. 1733-1745 https://doi.org/10.1115/GT2010-22212
Copeland, Colin ; Newton, Peter ; Martinez-Botas, Ricardo ; Seiler, Martin. / The effect of unequal admission on the performance and loss generation in a double-entry turbocharger turbine. ASME Turbo Expo 2010: Power for Land, Sea, and Air (GT2010) . New York, U. S. A. : ASME, 2010. pp. 1733-1745
@inproceedings{160c97e3d8204168bb1bc2684f4eee0b,
title = "The effect of unequal admission on the performance and loss generation in a double-entry turbocharger turbine",
abstract = "The current work investigates a circumferentially-divided turbine volute designed such that each gas inlet feeds a separate section of the turbine wheel. Although there is a small connecting interspace formed between the nozzle and the mixed flow rotor inlet, this design does well to preserve the exhaust gas energy in a pulsed-charged application by largely isolating the two streams entering the turbine. However, this type of volute design produces some interesting flow features as a result of unequal flows driving the turbine wheel. To investigate the influence of unequal flows, experimental data from the turbocharger facility at Imperial College has been gathered over a wide range of steady-state, unequal admission conditions. These test results show a significant drop in turbine performance with increasing pressure difference between inlets. In addition, the swallowing capacities of each gas inlet are interdependent, thus indicating some flow interaction between entries. To understand the flow physics driving the observed performance, a full 3-D CFD model of the turbine was created. Results show a highly disturbed flow field as a consequence of the non uniform admission. From these results, it is possible to identify the regions of aerodynamic loss responsible for the measured performance decrease. Given the unequal flows present in a double-entry design, each rotor passage sees an abrupt change in flow conditions as it rotates spanning the two feeding sectors. This operation introduces a high degree of unsteady flow into the rotor passage even when it operates in steady conditions. The amplitude and frequency of this unsteadiness will depend both on the level of unequal admission and the speed of rotor rotation. The reduced frequency associated with this disturbance supports the evidence that the flow in the rotor passage is unsteady. Furthermore, the CFD model indicates that the blade passage flow is unable to fully develop in the time available to travel between the two different sectors (entries).",
author = "Colin Copeland and Peter Newton and Ricardo Martinez-Botas and Martin Seiler",
year = "2010",
doi = "10.1115/GT2010-22212",
language = "English",
isbn = "9780791844021",
pages = "1733--1745",
booktitle = "ASME Turbo Expo 2010",
publisher = "ASME",

}

TY - GEN

T1 - The effect of unequal admission on the performance and loss generation in a double-entry turbocharger turbine

AU - Copeland, Colin

AU - Newton, Peter

AU - Martinez-Botas, Ricardo

AU - Seiler, Martin

PY - 2010

Y1 - 2010

N2 - The current work investigates a circumferentially-divided turbine volute designed such that each gas inlet feeds a separate section of the turbine wheel. Although there is a small connecting interspace formed between the nozzle and the mixed flow rotor inlet, this design does well to preserve the exhaust gas energy in a pulsed-charged application by largely isolating the two streams entering the turbine. However, this type of volute design produces some interesting flow features as a result of unequal flows driving the turbine wheel. To investigate the influence of unequal flows, experimental data from the turbocharger facility at Imperial College has been gathered over a wide range of steady-state, unequal admission conditions. These test results show a significant drop in turbine performance with increasing pressure difference between inlets. In addition, the swallowing capacities of each gas inlet are interdependent, thus indicating some flow interaction between entries. To understand the flow physics driving the observed performance, a full 3-D CFD model of the turbine was created. Results show a highly disturbed flow field as a consequence of the non uniform admission. From these results, it is possible to identify the regions of aerodynamic loss responsible for the measured performance decrease. Given the unequal flows present in a double-entry design, each rotor passage sees an abrupt change in flow conditions as it rotates spanning the two feeding sectors. This operation introduces a high degree of unsteady flow into the rotor passage even when it operates in steady conditions. The amplitude and frequency of this unsteadiness will depend both on the level of unequal admission and the speed of rotor rotation. The reduced frequency associated with this disturbance supports the evidence that the flow in the rotor passage is unsteady. Furthermore, the CFD model indicates that the blade passage flow is unable to fully develop in the time available to travel between the two different sectors (entries).

AB - The current work investigates a circumferentially-divided turbine volute designed such that each gas inlet feeds a separate section of the turbine wheel. Although there is a small connecting interspace formed between the nozzle and the mixed flow rotor inlet, this design does well to preserve the exhaust gas energy in a pulsed-charged application by largely isolating the two streams entering the turbine. However, this type of volute design produces some interesting flow features as a result of unequal flows driving the turbine wheel. To investigate the influence of unequal flows, experimental data from the turbocharger facility at Imperial College has been gathered over a wide range of steady-state, unequal admission conditions. These test results show a significant drop in turbine performance with increasing pressure difference between inlets. In addition, the swallowing capacities of each gas inlet are interdependent, thus indicating some flow interaction between entries. To understand the flow physics driving the observed performance, a full 3-D CFD model of the turbine was created. Results show a highly disturbed flow field as a consequence of the non uniform admission. From these results, it is possible to identify the regions of aerodynamic loss responsible for the measured performance decrease. Given the unequal flows present in a double-entry design, each rotor passage sees an abrupt change in flow conditions as it rotates spanning the two feeding sectors. This operation introduces a high degree of unsteady flow into the rotor passage even when it operates in steady conditions. The amplitude and frequency of this unsteadiness will depend both on the level of unequal admission and the speed of rotor rotation. The reduced frequency associated with this disturbance supports the evidence that the flow in the rotor passage is unsteady. Furthermore, the CFD model indicates that the blade passage flow is unable to fully develop in the time available to travel between the two different sectors (entries).

UR - http://dx.doi.org/10.1115/GT2010-22212

U2 - 10.1115/GT2010-22212

DO - 10.1115/GT2010-22212

M3 - Conference contribution

SN - 9780791844021

SP - 1733

EP - 1745

BT - ASME Turbo Expo 2010

PB - ASME

CY - New York, U. S. A.

ER -