Turbocharger Axial Turbines for High Transient Response, Part 1: A Preliminary Design Methodology

Walsh, Glen; Berchiolli, Marco; Guarda, Gregory; Pesyridis, Apostolos

doi:10.3390/app9050838

Cited by 4 publications

(8 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ratio of the flow loss to the ideal energy in the static and dynamic cascades was called the energy loss coefficient, which is an index to measure the flow loss in cascades. 22,23 It can be expressed as follows:…”

Section: Experimental Methodsmentioning

confidence: 99%

Research on aerodynamic characteristics of two-stage axial micro air turbine spindle for small parts machining

Jiang

Guo

Shujing

et al. 2014

Advances in Mechanical Engineering

View full text Add to dashboard Cite

In order to meet the requirements of output torque, efficiency and compact shape of micro-spindles for small parts machining, a two-stage axial micro air turbine spindle with an axial inlet and outlet is proposed. Based on the k-ω turbulence model of SST, the flow field and operation characteristics of the two-stage axial micro air turbine spindle were studied using computational fluid dynamics (CFD) combined with an experimental study. We obtained the air turbine spindle under different working conditions of the loss and torque characteristics. When the inlet pressure was 300 KPa, the output speed of the two-stage turbine was 100,000 rpm, 9% higher than that of a single-stage turbine output torque. The total torque reached 6.39 N·mm, and the maximum efficiency of the turbine and the spindle were 42.2% and 32.3%, respectively. Through the research on the innovative structure of the two-stage axial micro air turbine spindle, the overall performance of the principle prototype has been significantly improved and the problems of insufficient output torque and low working efficiency in high-speed micro-machining can be solved practically, which laid a solid foundation for improving the machining efficiency of small parts and reducing the size of micro machine tool.

show abstract

Section: Experimental Methodsmentioning

confidence: 99%

Research on aerodynamic characteristics of two-stage axial micro air turbine spindle for small parts machining

Jiang

Guo

Shujing

et al. 2014

Advances in Mechanical Engineering

View full text Add to dashboard Cite

show abstract

“…Therefore, a key challenge is the corresponding decrease in efficiency with a decrease in size. This calls for finer manufacturing tolerances and, in turn, makes the employment of axial turbines for turbocharger applications more costly [10]. Hence, increases in aerodynamic efficiency are of paramount importance in the successful employment of such designs.…”

Section: Axial Turbines For Turbochargingmentioning

confidence: 99%

“…The calculation is done at an engine speed of 5000 rpm. The mass flow rate was found to be 0.118 kg/s using Equation (10), and the manifold pressure was found to be 2.14 bar using Equation (11).…”

Section: Compressor and Turbine Map Scalingmentioning

confidence: 99%

Preliminary Investigation of the Performance of an Engine Equipped with an Advanced Axial Turbocharger Turbine

2020

Self Cite

View full text Add to dashboard Cite

Stringent emission regulations and increased demand for improved fuel economy have called for advanced turbo technologies in automotive engines. The use of turbochargers on smaller engines is one such concept, but they are limited by a time delay in reaching the required boost during transient operation. The amount of turbocharger lag plays a key role in the driver’s perceived quality of a passenger vehicle’s engine response. This paper investigates an alternative method to the conventional design of a turbocharger turbine to improve the transient response of a passenger vehicle. The investigation utilises the Ford Eco-Boost 1.6 L petrol engine, an established production engine, equipped with a turbocharger of similar performance to the GT1548 produced by Honeywell. The commercially available Ricardo WAVE was used to model the engine. Comparing the steady-state performance showed that the axial turbine provides higher efficiencies at all operating conditions of an engine. The transient case demonstrated an improved transient response at all operating conditions of the engine. The study concluded that, by designing a similar sized axial turbine, the mass moment of inertia can be reduced by 12.64% and transient response can be improved on average by 11.76%, with a maximum of 21.05% improvement. This study provides encouragement for the wider application of this turbine type to vehicles operating on dynamic driving cycles such as passenger vehicles, light commercial vehicles, and certain off-road applications.

show abstract

“…The CFD setup was conducted as explained in Part 1, based around the preliminary blade design [1]. The CFD was conducted using ANSYS CFX (18.2, ANSYS Inc., Canonsburg, Pa, USA) with the built in turbo mode.…”

Section: Computational Fluid Dynamics (Cfd)mentioning

confidence: 99%

“…This work is a continuation of a previous paper, presenting a preliminary design methodology for axial turbocharger turbines [1]. The computational resource increment in recent years has allowed multidisciplinary design optimisation (MDO) to permeate multiple R&D disciplines, to the point of becoming essential in aerodynamic shapes optimization [2,3].…”

Section: Introductionmentioning

confidence: 99%

Turbocharger Axial Turbines for High Transient Response, Part 2: Genetic Algorithm Development for Axial Turbine Optimisation

et al. 2019

View full text Add to dashboard Cite

In a previous paper [1], a preliminary design methodology was proposed for the design of an axial turbine, replacing a conventional radial turbine used in automotive turbochargers, to achieve improved transient response, due to the intrinsically lower moment of inertia. In this second part of the work, the focus is on the optimisation of this preliminary design to improve on the axial turbine efficiency using a genetic algorithm in order to make the axial turbine a more viable proposition for turbocharger turbine application. The implementation of multidisciplinary design optimisation is essential to the aerodynamic shape optimisation of turbocharger turbines, as changes in blade geometry lead to variations in both structural and aerodynamics performance. Due to the necessity to have multiple design objectives and a significant number of variables, genetic algorithms seem to offer significant advantages. However, large generation sizes and simulation run times could result in extensively long periods of time for the optimisation to be completed. This paper proposes a dimensioning of a multi-objective genetic algorithm, to improve on a preliminary blade design in a reasonable amount of time. The results achieved a significant improvement on safety factor of both blades whilst increasing the overall efficiency by 2.55%. This was achieved by testing a total of 399 configurations in just over 4 h using a cluster network, which equated to 2.73 days using a single computer.

show abstract

Turbocharger Axial Turbines for High Transient Response, Part 1: A Preliminary Design Methodology

Cited by 4 publications

References 10 publications

Research on aerodynamic characteristics of two-stage axial micro air turbine spindle for small parts machining

Research on aerodynamic characteristics of two-stage axial micro air turbine spindle for small parts machining

Preliminary Investigation of the Performance of an Engine Equipped with an Advanced Axial Turbocharger Turbine

Turbocharger Axial Turbines for High Transient Response, Part 2: Genetic Algorithm Development for Axial Turbine Optimisation

Contact Info

Product

Resources

About