Effect of the inlet geometry on performance, surge margin and noise emission of an automotive turbocharger compressor

Galindo, José; Tiseira, A.; Garcia, Roberto; Tarí, Daniel; Meano, Cesare Maria

doi:10.1016/j.applthermaleng.2016.08.099

Cited by 66 publications

(45 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionsupporting

confidence: 75%

Surge Limit Prediction for Automotive Air-Charged Systems

Bühler

Leichtfuß

Schiffer

et al. 2019

IJTPP

View full text Add to dashboard Cite

show abstract

“…Unfortunately, scarce data is available in the literature regarding the acoustic effect of turbocompressor inlet geometries. However, Karim et al [10] recently demonstrated that for instance inlet swirl vanes can achieve a reduction on the 4 -12 kHz noise band of the compressor, and Galindo et al [11] reported an overall noise influence of different nozzles, although no frequency content analysis was performed.…”

Section: Introductionmentioning

confidence: 99%

Impact of simple surge-enhancing inlet geometries on the acoustic behavior of a turbocompressor

Broatch

Margot

García-Tíscar

et al. 2018

International Journal of Engine Research

View full text Add to dashboard Cite

This paper reports the results of an experimental campaign where four different inlet geometries for the compressor of an automotive turbocharger were acoustically characterized. These four geometries (a straight pipe for reference, a tapered duct, a 90º elbow and a reservoir) were selected for their potential for deep surge margin enhancement, while being simple enough to be commonly found in production vehicles. A detailed measurement of this surge margin enhancement was performed, together with acoustic measurements of both radiated and orifice noise at design conditions of best isentropic efficiency and also close to the deep surge limit. Results demonstrated that while all the proposed geometries indeed enlarged the usable air mass flow range, changes in the acoustic behaviour of the system could be positive, neutral, or even negative. It is therefore important to carefully consider accurate noise measurements before implementing these geometric solutions in production vehicles, and to further pursue research on the link between the characteristic flow pattern produced by each inlet geometry and the noise emission of the turbocompressor.

show abstract

“…Phenomena leading to surge instabilities complicate the study of surge occurrence which may be associated to the compressor stall and may achieve a mild surge depending on the circuit acoustic resonance. For a high rotational speed of the compressor, the limit is difficult to characterize, and it is possible to switch abruptly to a deep surge [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…Other methods as the analysis of the standard deviation of temperature signals [11] or frequency domain analysis [12,13] have also been applied on automotive turbocharger performances studies. Real-time quantification of the surge margin associated with an appropriate control would achieve the best performance of the system while maintaining stable operation, but it is still a challenge [3,4].…”

Section: Introductionmentioning

confidence: 99%

Automotive compressor: effect of an electric throttle in the upstream circuit on the surge limit

et al. 2018

View full text Add to dashboard Cite

On vehicles equipped with a turbocharged engine, there is a risk of compressor surge. This surge generates instabilities that lead to driving inconvenience, or even mechanical failure of the supercharging system. In general, the surge appears rather in transient operation: sudden closing of the throttle valve on gasoline engine, regulation of the EGR on diesel engine linked also to turbine regulation (VNT device or Waste Gate). On a turbocharger test stand, we set up the surge line in a “conventional way”: stationary experiments. Then we set up this line in transient conditions for different positions of an electric throttle placed upstream the compressor. It appears that: the surge limit is pushing back to lower flow rates when it is determined in transient; the surge limit is pushing back to lower flow rates when closing the throttle valve. The tests were carried on by the transient analysis of the surge during a quick closing-opening of the electric throttle valve.

show abstract

Effect of the inlet geometry on performance, surge margin and noise emission of an automotive turbocharger compressor

Cited by 66 publications

References 31 publications

Surge Limit Prediction for Automotive Air-Charged Systems

Surge Limit Prediction for Automotive Air-Charged Systems

Impact of simple surge-enhancing inlet geometries on the acoustic behavior of a turbocompressor

Automotive compressor: effect of an electric throttle in the upstream circuit on the surge limit

Contact Info

Product

Resources

About