On wide mapping of a mixed flow turbine with regard to compressor heat flows during turbocharger testing

Lüddecke, Bernhardt; Filsinger, Dietmar; Bargende, Michael

doi:10.1533/9780857096135.4a.185

Cited by 13 publications

(11 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As seen below, the compression pressure ratio was not significantly affected by these changes. The result is identical to the findings of previous studies [3,8]. Figure 3 shows the compressor efficiency results by measuring the changes in temperatures of both the turbine inlet and the oil.…”

Section: Condition Unit Hot Gas Test (Turbocharger Maker) Cold Gas Tesupporting

confidence: 88%

See 1 more Smart Citation

An Investigation on the Efficiency Correction Method of the Turbocharger at Low Speed

Chung

Kim

et al. 2018

Energies

View full text Add to dashboard Cite

Abstract:The heat transfer in the turbocharger occurs due to the temperature difference between the exhaust gas and intake air, coolant, and oil. This heat transfer causes the efficiency of the compressor and turbine to be distorted, which is known to be exacerbated during low rotational speeds. Thus, this study proposes a method to mitigate the distortion of the test result data caused by heat transfer in the turbocharger. With this method, the representative compressor temperature is defined and the heat transfer rate of the compressor is calculated by considering the effect of the oil and turbine inlet temperatures at low rotation speeds, when the cold and the hot gas test are simultaneously performed. The correction of compressor efficiency, depending on the turbine inlet temperature, was performed through both hot and cold gas tests and the results showed a maximum of 16% error prior to correction and a maximum of 3% error after the correction. In addition, it shows that it is possible to correct the efficiency distortion of the turbocharger by heat transfer by correcting to the combined turbine efficiency based on the corrected compressor efficiency.

show abstract

Section: Condition Unit Hot Gas Test (Turbocharger Maker) Cold Gas Tesupporting

confidence: 88%

“…There are two main problems. One is the distortion of the efficiency of compressor and turbine due to heat transfer [2,3,[7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

An Investigation on the Efficiency Correction Method of the Turbocharger at Low Speed

Chung

Kim

et al. 2018

Energies

View full text Add to dashboard Cite

show abstract

“…The WGT tests in this study included very low turbine inlet temperature conditions (313.15 K) and high-temperature (573.15-873.15 K) experiments. Therefore, additional compressor power correction was performed because the measured compressor power at high turbine inlet temperature conditions presented relatively large distortions due to heat transfer from the turbine [11,13,17].…”

Section: Simplification Of the Correction Equationmentioning

confidence: 99%

“…In another study, a compressor efficiency correction method was proposed through an experiment on the change in turbine inlet temperature [13].…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Turbine Inlet Temperature and Backpressure Conditions on Reduced Turbine Flow Rate Performance Characteristics and Correction Method for Automotive Turbocharger

et al. 2019

View full text Add to dashboard Cite

In actual vehicle operation, the turbocharger turbine operates at various temperatures, inlet, and backpressure conditions, unlike compressors. The flow rate characteristics of the turbine are generally evaluated under certain conditions using an assembled turbocharger with a compressor and a turbine and a hot gas bench from the turbocharger manufacturer. Flow rate characteristics are also presented as the reduced mass flow rate to correct the flow rate characteristics according to the turbine inlet temperature and pressure. Therefore, the turbine mass flow rate seen in many engine development cases and studies—including the analysis of the turbine performance and characteristics, engine model configuration, and matching of the engine and turbocharger—is calculated according to the reduced turbine mass flow rate performance and turbine inlet temperature and pressure obtained through hot gas bench experiments under certain conditions. However, the performance of the reduced turbine mass flow rate is influenced by the compressor power conditions, and additional correction of the reduced turbine mass flow rate is required when the turbine inlet temperature and turbine backpressure differ from the reference test conditions, such as the hot gas bench test conditions. In this study, the effect of the turbine inlet temperature and turbine backpressure on the performance of the reduced turbine mass flow rate were examined based on the power balance relationship between the compressor and turbine of an automotive turbocharger. The principle of its correction is also presented.

show abstract

“…Furthermore, models based on calibrated coefficients to provide an estimation of heat transfer or adiabatic efficiency are widely used. Luddecke et al [68] propose a method to correct measurements of turbine efficiency taking into account heat transfer. The corrected characteristics are presented as a function of turbine pressure ratio and blade speed ratio.…”

Section: Turbocharger Heat Transfer Modelsmentioning

confidence: 99%

Experimental study of oil coking problem and contribution to the modelling of heat transfer in turbochargers

Usaquén¹,

Tatiana²

View full text Add to dashboard Cite

The automotive industry represents one of the most important sectors in the world. Given its socio-economic influence, research is aimed at reducing fuel consumption and emissions. Turbochargers provide several benefits including increased power for a given engine size, improved fuel economy and reduced emissions. The turbocharger is an important piece for the new generation of engines that must comply with the Euro 6 or in the U.S. Tier 3 vehicle emissions and fuel standard program. As more effort is made to increase efficiencies and reduce emissions, the complexity of the system increases. The high rotational speeds, pulsating flow conditions and high temperature differences between working fluids (exhaust gases, compressed air, lubricating oil, coolant fluids) make the turbo-charging a challenging task. Numerical simulation opens a range of possibilities to study the performance, efficiency and design of components in the turbocharger, but requires continued accuracy refinements. In this thesis, a great effort has been made to improve the overall understanding of the different physical phenomena that occur inside the turbocharger. Both, experimental and modelling efforts have been made to understand the thermal behaviour of the turbocharger under engine start/stop conditions. After state-of-the-art review of thermal studies and heat transfer simulation codes, this work presents an extensive experimental testing campaign that includes a thermal characterization of the turbocharger in stationary and transient conditions. Subsequently, several turbochargers were measured to assess the consequences that degraded oils can generate in the bearing system during endurance tests of oilcoking.To minimize the possibilities of coke formation, some theoretical studies were done. First, a 1D turbocharger model was used in GT-Power TM for a detailed study of the temperature rise in the central housing during an engine hot-stop. The simulated cooling strategies aims to find an optimal in terms of minimizing extra energy consumption per K housing temperature reduction. After, a 2D radial model is proposed as improvement of an existing one-dimensional model developed at CMT -Universitat Politècnica de València. Aiming for a low computational cost, the radial model was developed to be compatible with fast one-dimensional engine simulations. Later, a detailed solution of heat fluxes was made by means of CFD using a 3D design of the turbocharger's central housing. The 3D model improved the results when temperature of the bearings/shaft is required. Additionally, thermal properties within the turbocharger can be obtained and therefore a reduction of the experimental tasks in the thermo-hydraulic test bench. Both 2D and 3D models were validated using experimental data, demonstrating predictive accuracy improvements on the results of previous models.i Resumen La industria automotriz representa uno de los sectores más importantes del mundo. Dada su influencia socioeconómica, la investigación está destinada a reducir el consumo de comb...

show abstract

On wide mapping of a mixed flow turbine with regard to compressor heat flows during turbocharger testing

Cited by 13 publications

References 4 publications

An Investigation on the Efficiency Correction Method of the Turbocharger at Low Speed

An Investigation on the Efficiency Correction Method of the Turbocharger at Low Speed

Study on the Effect of Turbine Inlet Temperature and Backpressure Conditions on Reduced Turbine Flow Rate Performance Characteristics and Correction Method for Automotive Turbocharger

Experimental study of oil coking problem and contribution to the modelling of heat transfer in turbochargers

Contact Info

Product

Resources

About