On-Engine Measurement of Turbocharger Surge Limit

Galindo, José; Tiseira, A.; Arnau, Francisco José; Lang, R.

doi:10.1111/j.1747-1567.2010.00697.x

Cited by 20 publications

(22 citation statements)

References 14 publications

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“…The inflow is assumed to be inhomogeneous for both configurations; however, increased map width could be detected. Similar results were investigated by Galindo et al [5][6][7], Hou et al [8], Elkamel [9], Marelli et al [10] and Serrano [11]. In contrast to Kerres' results, Bayomi [12] stated that map width enhancement is gained by assembling flow straighteners upstream of the compressor, providing a more homogeneous inflow.…”

Section: Introductionsupporting

confidence: 75%

Surge Limit Prediction for Automotive Air-Charged Systems

Bühler

Leichtfuß

Schiffer

et al. 2019

IJTPP

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Compressor surge has been investigated and predicted since the early days of turbomachinery research. Experimental testing of turbomachinery applications is still needed to determine whether stable compressor operation is possible in the expected application regime. Measuring compressor maps and operating ranges on hot gas test stands is common. The test benches are designed and optimized to ensure ideal inflow and outflow conditions as well as low measurement uncertainty. Compressor maps are used to match turbocharger and application. However, a shift in surge limit, caused by the piping system or application, can only be adequately addressed with full engine tests. Ideal measurements use the corresponding piston engine in the charged-air system. This can only take place in the development process, when surge detection is unfavorable from an economic perspective. The surge model for turbochargers presented here is an extension of the Greitzer’s surge model, which considers the effect of inlet throttling. Application components, such as air filters, pipe elbows and flow straighteners, reduce pressure in front of the compressor and flow conditions might differ from those in laboratory testing. Experimental results gathered from the hot gas test stand at TU Darmstadt indicate strong variation in surge limit, influenced by inlet throttling. An extension to the surge model is developed to explain the observed phenomena. The model was validated using extensive experimental variations and matches the experienced surge limit shift. Additional measurements with a piston engine downstream of the turbocharger demonstrated the validity of the surge model. The results also show that surge is a system-dependent phenomenon, influenced by compressor aerodynamics and boundary conditions.

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Section: Introductionsupporting

confidence: 75%

Surge Limit Prediction for Automotive Air-Charged Systems

Bühler

Leichtfuß

Schiffer

et al. 2019

IJTPP

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show abstract

“…In order to prevent the appearance of deep surge, with its inherent danger to the integrity of the compressor, pressure signals were closely monitored to detect the onset of very low frequency components (5 to 20 Hz) which were shown by Galindo et al [28] to be significant indicators of deep surge. It should be noted however that the precise frequencies vary with the compressor and inlet geometry and should be either measured or estimated through the Helmholtz frequency and the B parameter as discussed by Fink et al [29].…”

Section: Resultsmentioning

confidence: 99%

Local flow measurements in a turbocharger compressor inlet

Torregrosa

Broatch

Margot

et al. 2017

Experimental Thermal and Fluid Science

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This paper describes an experimental study carried out with the objective of characterizing flow instabilities in turbocharger compressors, specially the distribution of the high-temperature compressed backflow that appears upstream of the impeller at marginal surge conditions. The inlet of a test compressor was fitted with linear and circumferential thermocouple arrays in order to measure the temperature distribution caused by this backflow, whose independence of duct wall temperature was validated through thermographic imaging. Miniaturized pressure probes at the inducer and diffuser showed how pressure spectra varied during the different operating conditions. Induct acoustic intensity was measured in both the inlet and the outlet to investigate the correlation between a known super-synchronous broadband issue known as whoosh noise and the backflow behaviour as characterized by local pressure and temperature. Analysis of the results points to inlet whoosh noise being boosted by this reversed flow but not caused by it, the source probably being located at or downstream of the compressor impeller.

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“…During recent decades many authors have investigated various procedures for establishing the limit flow range of compressors before surge onset. Galindo et al [28] used the air injection technique to measure the surge line of a turbocharger compressor, proving the advantages of this method in order to evaluate the influence of the inlet geometry and engine intake line acoustics.…”

Section: Literature Reviewmentioning

confidence: 99%

Experimental Investigation of Stall and Surge in a Multistage Compressor

Munari

Morini

Pinelli

et al. 2016

Journal of Engineering for Gas Turbines and Power

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Flow instability conditions, in particular during surge and stall phenomena, have always influenced the operational reliability of turbocompressors and have attracted significant interest resulting in extensive literature. Nowadays, this subject is still one of the most investigated because of its high relevance on centrifugal and axial compressor operating flow range, performance, and efficiency. Many researchers approach this important issue by developing numerical models, whereas others approach it through experimental studies specifically carried out in order to better comprehend this phenomenon. The aim of this paper is to experimentally analyze the stable and unstable operating conditions of an aeronautic turboshaft gas turbine axial-centrifugal compressor installed on a brand new test rig properly designed for this purpose. The test facility is set up in order to obtain (i) the compressor performance maps at rotational speeds up to 25,000 rpm and (ii) the compressor transient behavior during surge. By using two different test rig layouts, instabilities occurring in the compressor, beyond the peak of the characteristic curve, are identified and investigated. These two types of analysis are carried out, thanks to pressure, temperature, and mass flow sensors located in strategic positions along the circuit. These measurement sensors are part of a proper control and acquisition system, characterized by an adjustable sampling frequency. Thus, the desired operating conditions of the compressor in terms of mass flow and rotational speed and transient of these two parameters are regulated by this dedicated control system

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On-Engine Measurement of Turbocharger Surge Limit

Cited by 20 publications

References 14 publications

Surge Limit Prediction for Automotive Air-Charged Systems

Surge Limit Prediction for Automotive Air-Charged Systems

Local flow measurements in a turbocharger compressor inlet

Experimental Investigation of Stall and Surge in a Multistage Compressor

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