Laser doppler velocimetry measurements in valved and ported engines

Journal Article · Wed Feb 01 04:00:00 EST 1984 · SAE Prepr.; (United States)

DOI:https://doi.org/10.4271/840375· OSTI ID:6461806

Liou, T M; Bracco, F V; Hall, M; Santavicca, D A

Measurements are presented of bulk velocity and its cyclic variation and of turbulence intensity in IC engines with combustion chambers of open shape. Engines with both ported* and valved intakes were tested. The ported engine was tested both with and without swirl and the valved engine without swirl only. The ported engine was motored at 1200, 1800 and 2400 RPM and the valved engine at 600, 1200 and 1800 RPM. In both engines the shape of the combustion chamber was such as not to introduce strong organized gas motion during compression. Thus the in-cylinder gas motion, including turbulence, was due primarily to the intake process. The measurements were made using laser Doppler velocimetry at data rates which were sufficiently high to determine the bulk velocity in each cycle and thereby separate the cyclic fluctuations of the bulk velocity from the turbulence. Such measurements are called cycleresolved and have not previously been made in either valved or ported engines at practical engine speeds using LDV. The measurements were made at numerous spatial locations in the ported engine and at a single location in the valved engine, in both cases on a plane centered within the clearance height over a crankangle interval of sixty-four degrees around TDC.

• Research Organization: Dept. of Mechanical and Aerospace Engineering, Princeton University
• OSTI ID: 6461806
• Journal Information: SAE Prepr.; (United States), Journal Name: SAE Prepr.; (United States) Vol. 840375; ISSN SEPPA
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
COMBUSTION CHAMBERS
COMPARATIVE EVALUATIONS
CONFIGURATION
DESIGN
ENGINES
FLOW RATE
FLUID FLOW
GAS FLOW
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MEASURING INSTRUMENTS
TURBULENT FLOW
VELOCIMETERS