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FINITE
ELEMENT NUMERICAL SIMULATION
AND PIV
INVESTIGATION OF FLOW FIELD
INSIDE
METERING-IN SPOOL VALVE
Gao Dianrong Hou Guiqing Yang
Linjie Jiang Wanlu
（Institute of Fluid Power, Yanshan University, Qinhuangdao 066004）
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Abstract:
The finite element method (FEM) and particle image velocimetry (PIV)
technique are utilized to get the flow field along the inlet passage,
the chamber, the metering port and the outlet passage of spool valve at
three different valve openings. For FEM numerical simulation, the stream
function y-vorticity w forms of continuity and Navier-Stokes equations
are employed and finite element method is applied to discrete the
equations. Homemade simulation codes are executed to compute the values
of stream function and vorticity at each node in the flow domain, then
according to the correlation between stream function and velocity
components, the velocity vectors of the whole field are calculated. For
particle image velocimetry experiment, pulse Nd: YAG laser is exploited
to generate laser beam, cylindrical and spherical lenses are combined
each other to produce 1.0 mm thickness laser sheet to illuminate the
object plane, Polystyrene spherical particle with diameter of 30~50 mm
is seeded in the fluid as a tracing particles, Kodak ES1.0 CCD camera is
employed to capture the images of interested, the images are processed
with FFT cross-correlation algorithm and the processing results is
displayed by Tecplot. Both results of numerical simulation and PIV
experimental show that there are three main areas in the spool valve
where vortex is formed. Numerical results also indicate that the valve
opening have some effects on the flow structure of the valve. The
investigation is helpful for qualitatively analyzing the energy loss,
noise generating, steady state flow forces and even designing the
geometry structure and flow passage.
Key words:
Flow field
Spool valve Finite element method (FEM) Particle image
velocimetry (PIV)
CLC No: TH137
国家自然科学基金资助项目(60374042).
Received 20030714, received in revised form 20031225
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