Laser Transit Anemometry Investigation of a High Speed Centrifugal Compressor

Japikse, David; Karon, David M.

doi:10.1115/89-gt-155

Cited by 12 publications

(24 citation statements)

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“…At the impeller outlet, there is a static balance between two zones and a mixing process occurs between these two zones. Figure 3 shows the schematics of Japikse’s 22 two-zone model (Supplementary Material, Figure 2).…”

Section: Simulation Methodsmentioning

confidence: 99%

A method of turbocharger design optimization for a diesel engine with exhaust gas recirculation

Din

Zhuge

Song

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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Downsizing a diesel engine using turbocharger and coupling it with exhaust gas recirculation is the recent trend to improve engine performance and emission control. For diesel engines, it is important to match a turbocharger that meets both the low-speed torque and high-speed power requirements. This article presents a method of turbocharger design optimization for a turbocharged diesel engine equipped with exhaust gas recirculation, on the basis of parametric study of turbocharger geometry. Turbocharger through-flow model along with one-dimensional engine model is used to study the effect of key geometric parameters of the compressor and turbine on engine brake torque, brake-specific fuel consumption, air flowrate and cylinder peak temperature. For compressor, the research emphasizes on impeller inlet relative diameter, inlet blade tip angle, impeller exit blade angle and exit blade height, while for turbine parameters such as volute throat area, inlet blade height, inlet diameter, outlet diameter and rotor exit blade angle are taken into account. Results show that in case of compressor, engine performance is sensitive to the inlet relative diameter, inlet blade angle and exit blade angle. In case of turbine, volute throat area, inlet blade height and inlet diameter have vital effect on engine performance. On the basis of results, an optimized turbocharger design is developed. Comparison shows prominent improvement in turbocharger maps and engine performance. Compressor maximum efficiency and pressure ratio are increased from 73% to 77% and 3.166 to 3.305, respectively. Most importantly, the area of compressor maximum efficiency zone is increased considerably. Also turbine efficiency is increased from 71.42% to 76.94%. As a result, engine torque and air flowrate are increased up to 5.26% and 8.31%, respectively, while brake-specific fuel consumption and cylinder peak temperature are decreased up to 5.00% and 4.31%, respectively.

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Section: Simulation Methodsmentioning

confidence: 99%

A method of turbocharger design optimization for a diesel engine with exhaust gas recirculation

Din

Zhuge

Song

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

show abstract

“…The present work deals with the PD process, which can be achieved by different strategies as reported in literature. 5 The difference between the proposed strategies is due to the formulation of the design problem, the employed analysis technique and design parameters. The formulation of the design problem deals with the manner of selecting optimization objectives, variables, and algorithms.…”

Section: Introductionmentioning

confidence: 99%

“…13 The last is the “two-zone” model, based on the jet-wake flow profile, it is detailed by Japikse. 5…”

Section: Introductionmentioning

confidence: 99%

An efficient methodology to generate optimal inputs for the preliminary design of centrifugal compressor impellers

Bourabia

Khalfallah

Cerdoun

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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Preliminary design of centrifugal compressors is an emphasized step, which initiates the design process. Even with the use of quick analysis methods such as one-dimensional models, preliminary design still occupies a substantial part of the total design time. Among the factors that can lengthen this time or even cause the design failure is the inappropriate selection of the design input parameters. The present paper proposes a methodology to generate optimal inputs for the preliminary design, which reduces the design time and optimizes its overall performance. This is achieved, firstly, by performing an aerothermodynamic analysis that defines the appropriate input parameters, which will be used by a preliminary design code. This analysis has allowed identifying three pilot parameters (inlet relative Mach number, work input factor, and slip factor) to guide the generation of adequate input parameters. This input parameter generator, which reduces considerably the failure rate, is then exploited efficiently in an optimization process considering the pilot parameters as decision variables. Therefore, the proposed input parameter generator is coupled with a preliminary design code and an optimization algorithm. The proposed input parameter generator was validated on four existing compressors, showing a gain of more than 90% of the design time. Mainly, the proposed optimization has created a preliminary design trade-off having the target requirements and with optimized off-design performance.

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“…Generally, turbocharger maps can be scaled from one turbocharger size to another based on similarity laws. 30–34 In view of geometric similarity, the corresponding dimensions of the machines are approximately proportional to each other. With similar dynamics, the forces and velocities developed at the corresponding local points are parallel and proportional.…”

Section: Introductionmentioning

confidence: 99%

Dimensionless quantification of small radial turbine transient performance

Deng

Pennycott

Zhang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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Turbochargers are inherently dynamic devices, comprising internal flow volumes, mechanical inertias and thermal masses. When operating under transient conditions within an engine system, these dynamics need to be better understood. In this paper, a new non-dimensional modelling approach to characterise the turbocharger is proposed. Two new dimensionless quantities are defined with respect to mechanical and thermal transient behaviour, which are used in conjunction with the Strouhal number for flow transients. The modelling approach is applied to a small wastegated turbocharger and validated against experimental results. The model is used to simulate the turbocharger mass flow rate, turbine housing temperature and shaft speed responses to different excitation frequencies for different sizes of turbine. The results highlight the influence of turbocharger size on the dynamic behaviour of the system, which is particularly marked for the turbine housing temperature. At certain frequency ranges, the system behaviour is quasi-steady, allowing modelling through static maps in these operating regions. Outside these ranges, however, transient elements play a more important role. The simulation study shows that the proposed dimensionless parameters can be used to normalise the influence of turbine size on the dynamic response characteristics of the system. The model and corresponding dimensionless parameters can be applied in future simulation studies as well as for turbocharger matching in industry.

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Laser Transit Anemometry Investigation of a High Speed Centrifugal Compressor

Cited by 12 publications

References 0 publications

A method of turbocharger design optimization for a diesel engine with exhaust gas recirculation

A method of turbocharger design optimization for a diesel engine with exhaust gas recirculation

An efficient methodology to generate optimal inputs for the preliminary design of centrifugal compressor impellers

Dimensionless quantification of small radial turbine transient performance

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