Dynamic Identification of thermodynamic parameters for Turbocharger Compressor Models

Richard Burke, Pablo Olmeda, José Ramón Serrano

Research output: Contribution to journalArticle

Abstract

A novel experimental procedure is presented which allows simultaneous identification of heat and work transfer parameters for turbocharger compressor models. The method introduces a thermally transient condition and uses temperature measurements to extract the adiabatic efficiency and internal convective heat transfer coefficient simultaneously, thus capturing the aerodynamic and thermal performance. The procedure has been implemented both in simulation and experimentally on a typical turbocharger gas stand facility.

Under ideal conditions, the new identification predicted adiabatic efficiency to within 1%point1 and heat transfer coefficient to within 1%. A sensitivity study subsequently showed that the method is particularly sensitive to the assumptions of heat transfer distribution pre and post compression. If
20% of the internal area of the compressor housing is exposed to the low pressure intake gas, and this is not correctly assumed in the identification process, errors of 7-15%points were observed for compressor efficiency. This distribution in heat transfer also affected the accuracy of heat transfer
coefficient which increased to 20%. Thermocouple sensors affect the transient temperature measurements and in order to maintain efficiency errors below 1%, probes with diameter of less than 1.5mm should be used.

Experimentally, the method was shown to reduce the adiabatic efficiency error at 90krpm and 110krpm compared to industry standard approach from 6% to 3%. However at low speeds, where temperature differences during the identification are small, the method showed much larger errors.
LanguageEnglish
Article numberGTP-15-1055
Pages1 - 10
Number of pages10
JournalJournal of Engineering for Gas Turbines and Power: Transactions of the ASME
Early online date21 Apr 2015
DOIs
StatusPublished - Oct 2015

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Compressors
Identification (control systems)
Thermodynamics
Heat transfer coefficients
Temperature measurement
Heat transfer
Thermocouples
Gases
Aerodynamics
Sensors
Industry
Temperature
Hot Temperature

Cite this

Dynamic Identification of thermodynamic parameters for Turbocharger Compressor Models. / Burke, Richard; Olmeda, Pablo; Serrano, José Ramón.

In: Journal of Engineering for Gas Turbines and Power: Transactions of the ASME, 10.2015, p. 1 - 10.

Research output: Contribution to journalArticle

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abstract = "A novel experimental procedure is presented which allows simultaneous identification of heat and work transfer parameters for turbocharger compressor models. The method introduces a thermally transient condition and uses temperature measurements to extract the adiabatic efficiency and internal convective heat transfer coefficient simultaneously, thus capturing the aerodynamic and thermal performance. The procedure has been implemented both in simulation and experimentally on a typical turbocharger gas stand facility.Under ideal conditions, the new identification predicted adiabatic efficiency to within 1{\%}point1 and heat transfer coefficient to within 1{\%}. A sensitivity study subsequently showed that the method is particularly sensitive to the assumptions of heat transfer distribution pre and post compression. If20{\%} of the internal area of the compressor housing is exposed to the low pressure intake gas, and this is not correctly assumed in the identification process, errors of 7-15{\%}points were observed for compressor efficiency. This distribution in heat transfer also affected the accuracy of heat transfercoefficient which increased to 20{\%}. Thermocouple sensors affect the transient temperature measurements and in order to maintain efficiency errors below 1{\%}, probes with diameter of less than 1.5mm should be used.Experimentally, the method was shown to reduce the adiabatic efficiency error at 90krpm and 110krpm compared to industry standard approach from 6{\%} to 3{\%}. However at low speeds, where temperature differences during the identification are small, the method showed much larger errors.",
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