The development of a dynamometer for torque measurement of automotive turbocharger turbines

Szymko, Shinri; McGlashan, Niall R.; Martinez-Botas, Ricardo; Pullen, Keith

doi:10.1243/09544070jauto401

Cited by 26 publications

(8 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The pulsating air flow simulating engine exhaust flow is produced by a pulse generator, made of two chopper plates with specified cut-out shape. Turbine output power is absorbed by an in-house developed eddy current dynamometer [20] which enables wider performance map measurement, compared to conventional compressor loadings [15][16][17].…”

Section: Experimental Methodsmentioning

confidence: 99%

See 1 more Smart Citation

An investigation of volute cross-sectional shape on turbocharger turbine under pulsating conditions in internal combustion engine

Yang

Martinez-Botas

Rajoo

et al. 2015

Energy Conversion and Management

View full text Add to dashboard Cite

a b s t r a c tEngine downsizing is a proven method for CO 2 reduction in Internal Combustion Engine (ICE). A turbocharger, which reclaims the energy from the exhaust gas to boost the intake air, can effectively improve the power density of the engine thus is one of the key enablers to achieve the engine downsizing. Acknowledging its importance, many research efforts have gone into improving a turbocharger performance, which includes turbine volute. The cross-section design of a turbine volute in a turbocharger is usually a compromise between the engine level packaging and desired performance. Thus, it is beneficial to evaluate the effects of cross-sectional shape on a turbine performance. This paper presents experimental and computational investigation of the influence of volute cross-sectional shape on the performance of a radial turbocharger turbine under pulsating conditions. The cross-sectional shape of the baseline volute (denoted as Volute B) was optimized (Volute A) while the annulus distribution of area-to-radius ratio (A/R) for the two volute configurations are kept the same. Experimental results show that the turbine with the optimized volute A has better cycle averaged efficiency under pulsating flow conditions, for different loadings and frequencies. The advantage of performance is influenced by the operational conditions. After the experiment, a validated unsteady computational fluid dynamics (CFD) modeling was employed to investigate the mechanism by which performance differs between the baseline volute and the optimized version. Computational results show a stronger flow distortion in spanwise direction at the rotor inlet with the baseline volute. Furthermore, compared with the optimized volute, the flow distortion is more sensitive to the pulsating flow conditions in the baseline volute. This is due to the different secondary flow pattern in the cross-sections, hence demonstrating a direction for desired volute cross-sectional shape to be used in a turbocharger radial turbine for internal combustion engine.

show abstract

Section: Experimental Methodsmentioning

confidence: 99%

“…RANS equations were solved by the commercial CFD code. Spalart-Allmaras model was used to model the turbulence, which has been confirmed as a reliable model for the prediction of turbine performance [20]. Instantaneous total pressure and total temperature from experiments were imposed as the inlet boundary conditions.…”

Section: Cfd Methodsmentioning

confidence: 99%

An investigation of volute cross-sectional shape on turbocharger turbine under pulsating conditions in internal combustion engine

Yang

Martinez-Botas

Rajoo

et al. 2015

Energy Conversion and Management

View full text Add to dashboard Cite

show abstract

“…Three main types of dynamometer have been used in turbocharger turbine testing for the past decades. Mcdonnel, and recently Szymko have given detailed reviews on these types of dynamometer.…”

Section: Turbine Test Rigmentioning

confidence: 99%

“…Compared with radial compressor (aerodynamic dynamometer), they can measure the turbine torque directly. Imperial College recently has focused on eddy current dynamometer . The newly developed eddy current dynamometer in Imperial College can load turbine over the entire operating range.…”

Section: Turbine Test Rigmentioning

confidence: 99%

Experimental Investigation on the Unsteady Performance of Automotive Turbocharger Turbine

Shi

Zhang

et al. 2012

Exp Techniques

View full text Add to dashboard Cite

This paper presents some development of the turbocharger turbine unsteady measurement under pulsating conditions. On the basis of the indirect turbine power measuring principle by using a radial compressor to load turbine, a new turbine test rig is set up, which uses an “auxiliary” turbocharger instead of the intercooler to achieve a close‐cycle loading. The experimental results show that it can enlarge the load range and achieve a benefit of compactness. Some key instantaneous data measurements including speed and inlet temperature are discussed and a new method of phase shift is introduced. Using the newly developed test rig, an automotive turbocharger turbine is measured under two pulse frequencies of 40 and 60 Hz. The instantaneous mass flow and efficiency maps are obtained with the instantaneous data measurement, and the obvious hysteresis surrounding the steady curve was also found.

show abstract

“…This assumption holds for a compressor operating at higher shaft speeds where the heat transfer is small compared to the work transfer (Serrano, Olmeda, Arnau, et al, 2013). On the turbine side, the condition of adiabatic operation can only be achieved in special laboratory conditions and commonly turbine work is estimated either through compressor enthalpy rise or using a turbine dynamometer (Szymko et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Heat transfer in turbocharger turbines under steady, pulsating and transient conditions

Burke¹,

Vagg²,

Chalet³

et al. 2015

International Journal of Heat and Fluid Flow

View full text Add to dashboard Cite

a b s t r a c tHeat transfer is significant in turbochargers and a number of mathematical models have been proposed to account for the heat transfer, however these have predominantly been validated under steady flow conditions. A variable geometry turbocharger from a 2.2 L Diesel engine was studied, both on gas stand and on-engine, under steady and transient conditions. The results showed that heat transfer accounts for at least 20% of total enthalpy change in the turbine and significantly more at lower mechanical powers. A convective heat transfer correlation was derived from experimental measurements to account for heat transfer between the gases and the turbine housing and proved consistent with those published from other researchers. This relationship was subsequently shown to be consistent between engine and gas stand operation: using this correlation in a 1D gas dynamics simulation reduced the turbine outlet temperature error from 33°C to 3°C. Using the model under transient conditions highlighted the effect of housing thermal inertia. The peak transient heat flow was strongly linked to the dynamics of the turbine inlet temperature: for all increases, the peak heat flow was higher than under thermally stable conditions due to colder housing. For all decreases in gas temperature, the peak heat flow was lower and for temperature drops of more than 100°C the heat flow was reversed during the transient.

show abstract

The development of a dynamometer for torque measurement of automotive turbocharger turbines

Cited by 26 publications

References 5 publications

An investigation of volute cross-sectional shape on turbocharger turbine under pulsating conditions in internal combustion engine

An investigation of volute cross-sectional shape on turbocharger turbine under pulsating conditions in internal combustion engine

Experimental Investigation on the Unsteady Performance of Automotive Turbocharger Turbine

Heat transfer in turbocharger turbines under steady, pulsating and transient conditions

Contact Info

Product

Resources

About