Development of the usm wind tunnel validation model for calibration
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Date
2018-06
Authors
Chiow Moon, Sim
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Abstract
Wind tunnel is a device which plays the important role in the study of effect of
a moving object through air stream. It generates the air flow which simulates the wind
flow condition. The performance of wind tunnel is always a factor to be concerned. A
good flow quality in test section can be surely reduce the uncertainty in the experiment
conducted, and hence, increase the repeatability and reliability for the experimental
results. Calibration of wind tunnel should be emphasized in the laboratory to maintain
the flow quality in the test section. The development of a standard model for USM
wind tunnel calibration is researched in current project. The standard model will need
to possess a valid experimental data for a wind tunnel experiment. The main objective
to be attained is to establish a standard model for the wind tunnel calibration. In current
research, it is important to study the pressure distribution on the selected wing model
for a range of angles of attack and then further investigate on the lift contribution for
the model by integrating the pressure distribution. The obtained experimental results
will be analyzed and validated by comparing with other wind tunnel data for similar
model and conditions. In brief, NACA 2412 infinite wing model is researched in this
FYP work. The model was pressure tapped with 33 pressure taps on upper surface and
lower surface. All the instruments involved in the experiment was initially calibrated to
avoid displeased uncertainty in the experiment. The experiment was conducted under
incompressible flow. Pressure distribution at various angles of attack were measured
and lift contribution was computed for the model. Experimental data was then validated
v
with reference data and discrepancy on the experimental data was identified. The
pressure distribution on the upper surface of the model did not reach a good agreement
with reference pressure distribution for the upper surface. However, the pressure
distribution of lower surface measured from experiment agreed well with reference data.
The finding from discrepancy analysis experiment indicates that the discrepancy might
cause by the deterioration of the pressure taps at the inner assembly of the model which
it can’t be checked due to the disassemble design of model. Further recommendations
are also given based on the improvement on the model accuracy measurement,
qualitative measurement and validation method for future research