3D CFD Analysis of Predicting Engine Blowby Considering Ring Dynamics Simerics Incorporated

Format:

Book

Conference/Event

Author/Creator:

Manne, Venkata Harish Babu, author.

Contributor:

Bedekar, Sanjeev

Das, Debasis

Ranganathan, Raj

Srinivasan, Chiranth

Conference Name:

WCX SAE World Congress Experience (2025-04-08 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2025

Summary:

This paper reports on the development of a simulation model to predict engine blowby flow rates for a common rail DI diesel engine. The model is a transient, three-dimensional computational fluid dynamics (CFD) model. Managing blowby flow rates is beneficial for managing fuel economy and oil consumption. In doing so, an improved understanding of the blowby phenomenon is also possible. A mesh for the sub-micron level clearances (up to 0.5 microns) within the piston ring pack is created using a novel approach. Commercial CFD software is used to solve the pressure, velocity, and temperature distributions within the fluid domain. Ring motions within the piston grooves are predicted by a rigorous force balance. This model is the first of its kind for predicting engine blowby using a three-dimensional simulation model while solving the complete set of governing transport equations, without neglecting any terms in the equations. The predicted blowby flow rate has been validated with experimental results for two different engine geometries under different operating conditions and shows good agreement, with deviation of up to 10L/minutes The simulation approach has good mass conservation, up to 95.4%, even with sub-micron level clearances, thus proving the accuracy and robustness of the model in capturing fine-scale fluid dynamics and blowby phenomenon

Notes:

Vendor supplied data

Publisher Number:

2025-01-8622

Access Restriction:

Restricted for use by site license