Fluid motion during flame propagation in a spark ignition engine
Laser Doppler velocimeter results are presented for the mean velocity and turbulence intensity measured during combustion in a research engine. Simultaneously with each LDV measurement, the cylinder pressure and gas state (unburned or burned) were measured so that conditional sampling techniques could be used in the data-averaging procedure. Measurements of the mean velocity component in the direction of flame propagation agree well with a computer simulation of the induced velocities generated by the volume expansion of the burned gases. Mean velocities measured parallel to the flame surface are shown to be complex because a small amount of swirl was present. Conditional sampling on the time of flame arrival at the LDV probe volume revealed a thirty percent cyclic-variation bias error in the turbulence component normal to the flame. The turbulence field ahead of the flame appears to be enhanced by compression, with the component normal to the flame increased twice as much as the parallel component.
- OSTI ID:
- 5899681
- Report Number(s):
- TP-840377
- Country of Publication:
- United States
- Language:
- English
Similar Records
Multiparameter conditionally sampled laser velocimetry measurements during flame propagation in a spark ignition engine
Conditionally-sampled velocity and turbulence measurements in a spark ignition engine
Related Subjects
330101* -- Internal Combustion Engines-- Spark-Ignition
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
COMPARATIVE EVALUATIONS
COMPRESSION
DATA ACQUISITION
DOPPLER EFFECT
ENGINES
FLAME PROPAGATION
FLOW RATE
FLUID FLOW
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
KINETICS
LASERS
MEASURING INSTRUMENTS
PRESSURE MEASUREMENT
REACTION KINETICS
SAMPLING
SPARK IGNITION ENGINES
TURBULENT FLOW
VELOCIMETERS
VORTEX FLOW