Search results

1 – 10 of 82
Article
Publication date: 11 April 2021

Lakhdar Bourabia, Cheikh Brahim Abed, Mahfoudh Cerdoun, Smail Khalfallah, Michaël Deligant, Sofiane Khelladi and Taha Chettibi

The purpose of this paper is the development of a new turbocharger compressor is a challenging task particularly when both wider operating range and higher efficiency are…

Abstract

Purpose

The purpose of this paper is the development of a new turbocharger compressor is a challenging task particularly when both wider operating range and higher efficiency are required. However, the cumbersome design effort and the inherent calculus burden can be significantly reduced by using appropriate design optimization approaches as an alternative to conventional design techniques.

Design/methodology/approach

This paper presents an optimization-based preliminary-design (OPD) approach based on a judicious coupling between evolutionary optimization techniques and a modified one-dimensional mean-line model. Two optimization strategies are considered. The first one is mono-objective and is solved using genetic algorithms. The second one is multi-objective and it is handled using the non-dominated sorting genetic algorithm-II. The proposed approach constitutes an automatic search process to select the geometrical parameters of the compressor, ensuring the most common requirements of the preliminary-design phase, with a minimum involvement of the designer.

Findings

The obtained numerical results demonstrate that the proposed tool can rapidly produce nearly optimal designs as an excellent basis for further refinement in the phase by using more complex analysis methods such as computational fluid dynamics and meta-modeling.

Originality/value

This paper outlines a new fast OBPD approach for centrifugal compressor turbochargers. The proposal adopts an inverse design method and consists of two main phases: a formulation phase and a solution phase. The complexity of the formulated problem is reduced by using a sensitivity analysis. The solution phase requires to link, in an automatic way, three processes, namely, optimization, design and analysis.

Details

Engineering Computations, vol. 38 no. 9
Type: Research Article
ISSN: 0264-4401

Keywords

Article
Publication date: 1 March 1991

J.R. Aldridge, J. Taylor and B.G. Dale

Research carried out to develop and advance the application of design and process failure mode and effects analysis (FMEA) at Garrett Automotive Ltd, Skelmersdale, is described…

Abstract

Research carried out to develop and advance the application of design and process failure mode and effects analysis (FMEA) at Garrett Automotive Ltd, Skelmersdale, is described. The work has been undertaken under the umbrella of the UMIST Total Quality Management Multi‐company Teaching Programme. From an analysis of the present methods of preparing and using FMEAs, procedural changes have been made which have resulted in more effective use of the technique. The findings include the reluctance of product engineering and manufacturing engineering personnel to take a leading role in the preparation of design and process FMEAs, respectively. The main reasons for this relate to a perceived lack of time or lack of understanding of the technique′s potential. It is also pointed out that, in the past, FMEAs have mainly been used to satisfy the demands of major customers and it takes some considerable effort to ensure that FMEAs are prepared and used in the correct manner.

Details

International Journal of Quality & Reliability Management, vol. 8 no. 3
Type: Research Article
ISSN: 0265-671X

Keywords

Article
Publication date: 8 May 2017

Hilmi Amiruddin, Wan Mohd Faizal Wan Mahmood, Shahrir Abdullah, Mohd Radzi Abu Mansor, Rizalman Mamat and Azri Alias

The purpose of this study is to determine the best vaned diffuser design that can generate higher pressure output at a predetermined speed.

Abstract

Purpose

The purpose of this study is to determine the best vaned diffuser design that can generate higher pressure output at a predetermined speed.

Design/methodology/approach

Several vaned diffusers of thin, flat-type design with different number of blades and blade angle were fabricated. The vaned diffusers were fitted inside the turbocharger compressor and test on a cold-flow turbocharger test rig. A Taguchi L27 orthogonal array is selected for analysis of the data. Influence of number of blades, blade angle and rotational speed on output pressure is studied using the analysis of variance (ANOVA) technique. Finally, confirmation tests are conducted to validate the experimental results.

Findings

The optimum design parameters of the vaned diffuser using signal-to-noise ratio analysis were six blades type, blade angle of 18° and rotational speed of 70,000 rpm. Results from ANOVA showed that the speed has the highest influence on output pressure. The number of blades and blade angle produced the least effect on the pressure output.

Originality/value

The study used the turbocharger with the impeller size 60 mm and adapted vaned diffuser to increase the output pressure.

Details

Industrial Lubrication and Tribology, vol. 69 no. 3
Type: Research Article
ISSN: 0036-8792

Keywords

Article
Publication date: 11 November 2021

Ahmed Ketata and Zied Driss

Variable geometry turbine (VGT), a key component of modern internal combustion engines (ICE) turbochargers, is increasingly used for better efficiency and reduced exhaust gas…

Abstract

Purpose

Variable geometry turbine (VGT), a key component of modern internal combustion engines (ICE) turbochargers, is increasingly used for better efficiency and reduced exhaust gas emissions. The aim of this study is the development of a new meanline FORTRAN code for accurate performance and loss assessment of VGTs under a wider operating range. This code is a useful alternative tool for engineers for fast design of VGT systems where higher efficiency and minimum loss are being required.

Design/methodology/approach

The proposed meanline code was applied to a variable geometry mixed flow turbine at different nozzle vane angles and under a wide range of rotational speed and the expansion ratio. The numerical methodology was validated through a comparison of the predicted performance to test data. The maps of the mass flow rate as well as the efficiency of the VGT system are discussed for different nozzle vane angles under a wide range of rotational speed. Based on the developed model, a breakdown loss analysis was carried out showing a significant effect of the nozzle vane angle on the loss distribution.

Findings

Results indicated that the nozzle angle of 70° has led to the maximum efficiency compared to the other investigated nozzle vane angles ranging from 30° up to 80°. The results showed that the passage loss was significantly reduced as the nozzle vane angle increases from 30° up to 70°.

Originality/value

This paper outlines a new meanline approach for variable geometry turbocharger turbines. The developed code presents the novelty of including the effect of the vane radii variation, due to the pivoting mechanism of the nozzle ring. The developed code can be generalized to either radial or mixed flow turbines with or without a VGT system.

Details

Engineering Computations, vol. 39 no. 4
Type: Research Article
ISSN: 0264-4401

Keywords

Content available

Abstract

Details

Sensor Review, vol. 33 no. 2
Type: Research Article
ISSN: 0260-2288

Article
Publication date: 1 June 1999

Peter L. Barlow

The function of lead additives in petrol is described, together with the effects on various engine components of their removal. The corrosive wear mechanisms are described in…

2018

Abstract

The function of lead additives in petrol is described, together with the effects on various engine components of their removal. The corrosive wear mechanisms are described in detail, and the effect of alternative additives in reducing corrosion and wear are covered. A number of field case histories are described, including experiences in Sweden, where lead replacement petrol was introduced in 1992. The article concludes with a series of recommendations designed to minimise possible damage to engines caused by substitution of leaded petrol by LRP.

Details

Industrial Lubrication and Tribology, vol. 51 no. 3
Type: Research Article
ISSN: 0036-8792

Keywords

Article
Publication date: 24 November 2021

Elena Zadorozhnaya, Vladislav Hudyakov, Elizaveta Polyacko and Igor Dolgushin

The reliability of various mechanisms and machines is determined by the durability of tribo-units, which must ensure operation at high temperatures and an extended range of rotor…

87

Abstract

Purpose

The reliability of various mechanisms and machines is determined by the durability of tribo-units, which must ensure operation at high temperatures and an extended range of rotor shaft speeds. The best performance of the bearing assembly is achieved with hydrodynamic lubrication, which depends on optimal operating conditions and temperature conditions. The purpose of this paper is determining the thermal state of the turbocharger (TCR) bearings.

Design/methodology/approach

The simulation was carried out in the ANSYS Fluent software package. The boundary conditions for the calculation were obtained from experimental data. The experiments were carried out at a specialized stand created at the scientific and production association “Turbotekhnika”.

Findings

The result of the simulation was the determination of temperatures and thermal fields in the TCR housing. The data obtained testify to the uneven thermal loading of the bearings. When calculating the dynamics of the rotor, transient modes are considered. The results are the trajectories of the rotor in the space of the bearing clearance. The thickness of the lubricating layer was calculated as a parameter that determines the hydrodynamic friction regime. The thermal state of the TCR elements was evaluated at all the considered rotor speeds. The flexible axis of the rotor was obtained at different speeds.

Originality/value

The paper presents a model of heat transfer in a TCR housing and rotor dynamics, based on numerical methods, which will help in the design of TCRs and journal bearings.

Details

Industrial Lubrication and Tribology, vol. 74 no. 3
Type: Research Article
ISSN: 0036-8792

Keywords

Content available
Article
Publication date: 1 June 2002

89

Abstract

Details

Anti-Corrosion Methods and Materials, vol. 49 no. 3
Type: Research Article
ISSN: 0003-5599

Keywords

Article
Publication date: 1 October 2001

A.S. Verin and M.A. Verin

Presents data which relate to the problem of creating a new technique and technology. In the 1990s the problem of the practical use of intermetallids Ni3Al and Fe3Al as structural…

Abstract

Presents data which relate to the problem of creating a new technique and technology. In the 1990s the problem of the practical use of intermetallids Ni3Al and Fe3Al as structural components in aircraft industry in the USSR was at the stage of a pilot application. In the USSR the process of the directional solidification of superalloys used in components of aircraft engines was at a high level. There was a commercial process for obtaining turbine blades with columnar structure (DC) and single crystal structure (SC) using different methods of cooling for the ingots during the growth, such as cooling on the copper shield and in melt metals (Sn,Al). On the basis of obtained data, theoretical research was conducted regarding the creation of new processes which could give rise to the possibility of directional solidification. One of these processes is the method of dosed feeding of the growing ingots. This method allows alterations to the microstructure, the plasticity, the strength of Ni3Al and Fe3Al intermetallids, and corrosion and oxidation resistance.

Details

Anti-Corrosion Methods and Materials, vol. 48 no. 5
Type: Research Article
ISSN: 0003-5599

Keywords

Content available
Article
Publication date: 1 April 2003

116

Abstract

Details

Aircraft Engineering and Aerospace Technology, vol. 75 no. 2
Type: Research Article
ISSN: 0002-2667

Keywords

1 – 10 of 82