Analysis of a Tilted Turbine Housing Volute Design Under Pulsating Inlet Conditions

Samuel Lee, Martyn Jupp, John Allport, Ambrose Nickson

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

2 Citations (Scopus)

Abstract

Radial inflow turbines are widely used in the automotive turbocharger industry due to the greater amount of work that can be extracted per stage and their ease of manufacture compared with equivalent axial designs [1]. The current industry trend towards downsized engines for lower emissions has driven research to focus on improving turbine technologies for greater aero-thermal efficiency. Consequently, mixed flow turbines have recently received significant interest due to a number of potential performance benefits over their radial counterparts, including reduced inertia and improved performance at low velocity ratios.

This paper investigates the performance of a tilted volute design compared with that of a radial design, under steady state and pulsating flow conditions. The tilted volute design was introduced in an attempt to improve inlet flow conditions of a mixed flow turbine wheel and hence improve performance. The investigation is entirely computational and the approach used was carefully validated against gas stand test results.

The results of the study show that under steady state conditions the tilted volute design resulted in stage efficiency improvements of up to 1.64%. Under pulsating flow conditions, the tilted housing design resulted in a reduction in incidence angle and a maximum cycle averaged rotor efficiency improvement of 1.49% while the stage efficiencies resulted in a 1.23% increase. To assess the loss mechanisms within the rotor, the entropy flux generation through the blade passage was calculated. The tilted housing design resulted in reductions in leading edge suction and shroud surface separation resulting in the improved efficiency as observed.
Original languageEnglish
Title of host publicationASME Turbo Expo 2017
Subtitle of host publication Turbomachinery Technical Conference & Exposition
PublisherAmerican Society of Mechanical Engineers (ASME)
Number of pages10
Volume2C: Turbomachinery
ISBN (Print)9780791850800
DOIs
Publication statusPublished - 2017
EventAmerican Society of Engineers Turbo-Expo: Turbomachinery Technical Conference & Exposition - Charlotte, United States
Duration: 26 Jun 201730 Jun 2017

Conference

ConferenceAmerican Society of Engineers Turbo-Expo
Abbreviated titleASME
CountryUnited States
CityCharlotte
Period26/06/1730/06/17

Fingerprint

Intake systems
Turbines
Rotors
Inlet flow
Automotive industry
Turbomachine blades
Wheels
Entropy
Fluxes
Engines
Gases

Cite this

Lee, S., Jupp, M., Allport, J., & Nickson, A. (2017). Analysis of a Tilted Turbine Housing Volute Design Under Pulsating Inlet Conditions. In ASME Turbo Expo 2017: Turbomachinery Technical Conference & Exposition (Vol. 2C: Turbomachinery). [V02CT44A016] American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/GT2017-63668
Lee, Samuel ; Jupp, Martyn ; Allport, John ; Nickson, Ambrose. / Analysis of a Tilted Turbine Housing Volute Design Under Pulsating Inlet Conditions. ASME Turbo Expo 2017: Turbomachinery Technical Conference & Exposition. Vol. 2C: Turbomachinery American Society of Mechanical Engineers (ASME), 2017.
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title = "Analysis of a Tilted Turbine Housing Volute Design Under Pulsating Inlet Conditions",
abstract = "Radial inflow turbines are widely used in the automotive turbocharger industry due to the greater amount of work that can be extracted per stage and their ease of manufacture compared with equivalent axial designs [1]. The current industry trend towards downsized engines for lower emissions has driven research to focus on improving turbine technologies for greater aero-thermal efficiency. Consequently, mixed flow turbines have recently received significant interest due to a number of potential performance benefits over their radial counterparts, including reduced inertia and improved performance at low velocity ratios.This paper investigates the performance of a tilted volute design compared with that of a radial design, under steady state and pulsating flow conditions. The tilted volute design was introduced in an attempt to improve inlet flow conditions of a mixed flow turbine wheel and hence improve performance. The investigation is entirely computational and the approach used was carefully validated against gas stand test results.The results of the study show that under steady state conditions the tilted volute design resulted in stage efficiency improvements of up to 1.64{\%}. Under pulsating flow conditions, the tilted housing design resulted in a reduction in incidence angle and a maximum cycle averaged rotor efficiency improvement of 1.49{\%} while the stage efficiencies resulted in a 1.23{\%} increase. To assess the loss mechanisms within the rotor, the entropy flux generation through the blade passage was calculated. The tilted housing design resulted in reductions in leading edge suction and shroud surface separation resulting in the improved efficiency as observed.",
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Lee, S, Jupp, M, Allport, J & Nickson, A 2017, Analysis of a Tilted Turbine Housing Volute Design Under Pulsating Inlet Conditions. in ASME Turbo Expo 2017: Turbomachinery Technical Conference & Exposition. vol. 2C: Turbomachinery, V02CT44A016, American Society of Mechanical Engineers (ASME), American Society of Engineers Turbo-Expo, Charlotte, United States, 26/06/17. https://doi.org/10.1115/GT2017-63668

Analysis of a Tilted Turbine Housing Volute Design Under Pulsating Inlet Conditions. / Lee, Samuel; Jupp, Martyn; Allport, John; Nickson, Ambrose.

ASME Turbo Expo 2017: Turbomachinery Technical Conference & Exposition. Vol. 2C: Turbomachinery American Society of Mechanical Engineers (ASME), 2017. V02CT44A016.

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

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T1 - Analysis of a Tilted Turbine Housing Volute Design Under Pulsating Inlet Conditions

AU - Lee, Samuel

AU - Jupp, Martyn

AU - Allport, John

AU - Nickson, Ambrose

N1 - Accepted date taken from ePrints. SH

PY - 2017

Y1 - 2017

N2 - Radial inflow turbines are widely used in the automotive turbocharger industry due to the greater amount of work that can be extracted per stage and their ease of manufacture compared with equivalent axial designs [1]. The current industry trend towards downsized engines for lower emissions has driven research to focus on improving turbine technologies for greater aero-thermal efficiency. Consequently, mixed flow turbines have recently received significant interest due to a number of potential performance benefits over their radial counterparts, including reduced inertia and improved performance at low velocity ratios.This paper investigates the performance of a tilted volute design compared with that of a radial design, under steady state and pulsating flow conditions. The tilted volute design was introduced in an attempt to improve inlet flow conditions of a mixed flow turbine wheel and hence improve performance. The investigation is entirely computational and the approach used was carefully validated against gas stand test results.The results of the study show that under steady state conditions the tilted volute design resulted in stage efficiency improvements of up to 1.64%. Under pulsating flow conditions, the tilted housing design resulted in a reduction in incidence angle and a maximum cycle averaged rotor efficiency improvement of 1.49% while the stage efficiencies resulted in a 1.23% increase. To assess the loss mechanisms within the rotor, the entropy flux generation through the blade passage was calculated. The tilted housing design resulted in reductions in leading edge suction and shroud surface separation resulting in the improved efficiency as observed.

AB - Radial inflow turbines are widely used in the automotive turbocharger industry due to the greater amount of work that can be extracted per stage and their ease of manufacture compared with equivalent axial designs [1]. The current industry trend towards downsized engines for lower emissions has driven research to focus on improving turbine technologies for greater aero-thermal efficiency. Consequently, mixed flow turbines have recently received significant interest due to a number of potential performance benefits over their radial counterparts, including reduced inertia and improved performance at low velocity ratios.This paper investigates the performance of a tilted volute design compared with that of a radial design, under steady state and pulsating flow conditions. The tilted volute design was introduced in an attempt to improve inlet flow conditions of a mixed flow turbine wheel and hence improve performance. The investigation is entirely computational and the approach used was carefully validated against gas stand test results.The results of the study show that under steady state conditions the tilted volute design resulted in stage efficiency improvements of up to 1.64%. Under pulsating flow conditions, the tilted housing design resulted in a reduction in incidence angle and a maximum cycle averaged rotor efficiency improvement of 1.49% while the stage efficiencies resulted in a 1.23% increase. To assess the loss mechanisms within the rotor, the entropy flux generation through the blade passage was calculated. The tilted housing design resulted in reductions in leading edge suction and shroud surface separation resulting in the improved efficiency as observed.

KW - design

KW - turbines

U2 - 10.1115/GT2017-63668

DO - 10.1115/GT2017-63668

M3 - Conference contribution

SN - 9780791850800

VL - 2C: Turbomachinery

BT - ASME Turbo Expo 2017

PB - American Society of Mechanical Engineers (ASME)

ER -

Lee S, Jupp M, Allport J, Nickson A. Analysis of a Tilted Turbine Housing Volute Design Under Pulsating Inlet Conditions. In ASME Turbo Expo 2017: Turbomachinery Technical Conference & Exposition. Vol. 2C: Turbomachinery. American Society of Mechanical Engineers (ASME). 2017. V02CT44A016 https://doi.org/10.1115/GT2017-63668