Velocity Characteristics of the Flow in Motored Engines.
Abstract
Measurements of mean and rms values of axial velocity obtained with a laser anemometer, are reported for a swirling incompressible air flow in a piston-cylinder assembly motored at 200 rpm to quantify the influence of stroke and clearance. The results show that longer stroke causes the formation of stronger vortices while smaller clearance generates high turbulence levels at the early part of the intake stroke; in both cases vortices decay as the piston approaches BDC. Measurements of swirl velocities are also reported a Diesel engine motored at 675 rpm with compression and 500 rpm without compression to quantify the influence of compression. The results show that the influence is insignificant in the intake stroke and the beginning of the compression stroke, but at higher crank angles the flow, under compression, tends towards solid body rotation. The experimental results in the non-compressing engine are compared with calculations obtained by numerical solution of the conservation equations and show that the major flow features are correctly predicted. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1980
- Accession Number
- ADA095893
Entities
People
- A. D. Gosman
- A. F. Bicen
- A. P. Morse
- C. Arcoumanis
- J. H. Whitelaw
Organizations
- Imperial College London