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Surge Limit Prediction for Automotive Air-Charged Systems

Institute of Gas Turbines and Aerospace Propulsion, Technische Universität Darmstadt, Otto-Berndt-Str. 2, 64287 Darmstadt, Germany
BorgWarner Turbo Systems Engineering GmbH, Kaiserstraße 1, 67292 Kirchheimbolanden, Germany
Author to whom correspondence should be addressed.
Int. J. Turbomach. Propuls. Power 2019, 4(4), 34;
Received: 11 June 2019 / Revised: 16 August 2019 / Accepted: 30 August 2019 / Published: 1 October 2019
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. View Full-Text
Keywords: centrifugal compressors; automotive turbochargers; surge model centrifugal compressors; automotive turbochargers; surge model
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MDPI and ACS Style

Bühler, J.; Leichtfuß, S.; Schiffer, H.-P.; Lischer, T.; Raabe, S. Surge Limit Prediction for Automotive Air-Charged Systems. Int. J. Turbomach. Propuls. Power 2019, 4, 34.

AMA Style

Bühler J, Leichtfuß S, Schiffer H-P, Lischer T, Raabe S. Surge Limit Prediction for Automotive Air-Charged Systems. International Journal of Turbomachinery, Propulsion and Power. 2019; 4(4):34.

Chicago/Turabian Style

Bühler, Johannes; Leichtfuß, Sebastian; Schiffer, Heinz-Peter; Lischer, Thomas; Raabe, Simon. 2019. "Surge Limit Prediction for Automotive Air-Charged Systems" Int. J. Turbomach. Propuls. Power 4, no. 4: 34.

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