This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Six Sigma Study on the Effect of Geometric Tolerances at Low Airflow Rates in a Progressive Bore Throttle Body using CFD
Technical Paper
2005-01-1916
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
This paper presents results of mass flow prediction study in progressive bore throttle body (TB), using CFD. A major emphasis of the study has been on capturing the effect of tolerance on clearance area and hence flow predictions, especially at low angles. In addition, effect of viscosity on mass flow predictions has been investigated.
Comparison of experimental mass flow obtained from a “manufactured TB” with CFD prediction leads to significant difference, especially at low angles. One reason for this difference is that CFD models based on mean-CAD geometry do not capture the effect of tolerances. To address this difference, an analytical equation for predicting clearance area has been developed. This allows capturing of variation in geometry due to manufacturing. A Design of Experiments (DoE) approach utilizing the analytical work and GE proprietary six sigma tools has been used to capture the effect of tolerances on the clearance area and quantify the variation. Sensitivity of the clearance area to various parameters has also been studied. This DoE based approach would be useful to identify the most sensitive geometric parameters and modify the tolerance range on such parameters to reduce flow variation.
A summary of turbulent and inviscid flow predictions on an 87 mm HITACHI TB for seven angles ranging from 4 to 11 deg has been presented. Excellent correlation with experimental data has been obtained with the inviscid option.
Recommended Content
Authors
Citation
Hardikar, N., Chunduru, S., Rexius, K., Tankala, T. et al., "Six Sigma Study on the Effect of Geometric Tolerances at Low Airflow Rates in a Progressive Bore Throttle Body using CFD," SAE Technical Paper 2005-01-1916, 2005, https://doi.org/10.4271/2005-01-1916.Also In
Automotive Electronics on CD-ROM from the SAE 2005 World Congress
Number: SP-1980CD; Published: 2005-04-11
Number: SP-1980CD; Published: 2005-04-11
References
- Chen J.L. Chen Grant “Throttle body at engine idle-Tolerance effect on flow rate” SAE paper 951057
- Hardikar N.A. “Analytical derivation of clearance area for progressive bore” GE Global Research-Technical Information Series Whitney Knowledge Center
- FLUENT 6.1 User's guide
- Genш-2.18 User's Manual
- MATHEMATICA 4.1 Reference Guide
- UNIGRAPHICS VER 18.0 User's Guide