C. Takeda et al., MEASUREMENT OF AXIAL-FLOW VELOCITY IN CYLINDER OF RECIPROCATING-ENGINE BY SINGLE INCIDENCE-BEAM REFERENCE-MODE LDA, JSME international journal. Series B, fluids and thermal engineering, 40(3), 1997, pp. 494-500
In order to measure flow velocity in the swirl and radial directions o
f a cylinder of an engine in practical use by means of a laser Doppler
anemometer(LDA) through a small measuring window on the cylinder head
, a back scattering fringe mode LDA is used. This LDA, however, can no
t be used to measure the velocity component in the axial direction of
the cylinder. A single incidence-beam reference-mode LDA is developed
to measure the velocity component along the optical axis of the LDA an
d is applied to measure the fluctuating flow velocity in the axial dir
ection of the cylinder. Ensemble-averaged mean velocity and fluctuatio
n intensity of the velocity as measured using the LDA show good agreem
ent with those measured using the conventional fringe-mode LDA. Based
on these results, it can be concluded that the reference-mode LDA is a
pplicable to measurements of the flow velocity in the axial direction
of the cylinder through the small window on the cylinder head.