Comparison of velocity field in a single-cylinder transparent internal combustion engine under cold flow conditions using Particle Image Velocimetry and Computational Fluid Dynamics UNIVERSITY OF WESTERN MACEDONIA

Format:

Book

Conference/Event

Author/Creator:

Tsiogkas, Vasileios D., author.

Contributor:

Bouras PhD, Ioannis

Dimitriadis, Kyriakos

Kolokotronis, Dimitrios

Theodorou, Nikolaos

Tourlidakis, A. (Antonios)

Conference Name:

15th International Conference on Engines & Vehicles (2021-09-12 : Capri, Italy)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2021

Summary:

Internal combustion engine will remain major propulsion system for land transportation for the next years till full electrification is achieved, and it is important to improve the combustion efficiency and emissions. To achieve this, it is important to understand and control the in cylinder flow, and primarily the "tumble" development and break down. In order to accomplish this, detailed in-cylinder experimental data are required in combination with high fidelity computational fluid dynamics analysis. Flow field measurements were obtained by using Time Resolved Particle Image Velocimetry technique in a 475cc optical single cylinder GDI spark ignition engine. The results include 50 consecutive cycles phase-averaged velocity fields at 2000rpm with wide open throttle. Alongside, RANS (Reynolds Averaged Navier Stokes) simulations were carried out using very a accurate geometrical description of the engine and flow boundary conditions corresponding to the experimental investigation in order to compare the flow field and validate quantities such as the turbulent kinetic energy (TKE), the Tumble Ratio (TR) and the pressure distributions inside the cylinder.It was observed that a tumble like motion with counter-clockwise rotation (CCW) was present at the early stages of the valves' opening procedure and evolved during the intake stroke. Results obtained with RANS computations show the same trend, mainly at the intake stroke, regarding the flow motion, when compared with the experimental results.The peak of TKE was found at 460° BTDC, 2000 RPM, for both TR-PIV and RANS results. The absolute value of TR, which corresponds to vorticity normalized with the angular velocity at the tumble plane, was higher at 460 CADs BTDC for experiments in relation to the results obtained from the simulation.Ongoing research work includes TR-PIV measurements at the early stages of combustion by using a 532nm bandpass filter, to investigate flame development and flame flow interaction. Moreover, computational models for combustion will be applied for validation

Notes:

Vendor supplied data

Publisher Number:

2021-24-0021

Access Restriction:

Restricted for use by site license