Zbornik radova Koridor 10 - Kirilo Savić

3rd International Scientific and Professional Conference
CORRIDOR 10 - a sustainable way of integrations
Mach number range is 0.1 to 0.6 with running only by fan, and 0.6 to 0.8 with fan and injector included.
Reynolds number is up to 2.3 million/m, and stagnation pressure is in range from 1.0 to 1.52 bar. Run
time is unlimited with fan power only, and up to 120s with injector system included.
The wind tunnel is equipped with: six-component external TEM balance, Multi-component internal
strain gauge balances of VTI, FFA and ABLE production, Pressure scanning system: five S3 or D9
Scanivalves (230 pressure taps), Dynamic stability derivatives rigs for pitch/yaw/roll, Air intake testing
rig, data acquisition system, Data acquisition computer, Control computer, Data reduction computer.
Main goal of testing runs is to determine the pressure distribution on the high-speed train model in the
configuration of single drive on open track.
2.1 Model description
The train model, illustrated on Figure 2, has been designed and manufactured for special purpose test
runs by means of heaving two mutually back connected locomotives. Model construction was made of
dural in 1:20 scale. Gross geometry measures are, in order: total model length 2.056m, width of 0.15m
and height 0.18m.
The holes for measurement of pressure distribution on the model should be small, with possibility to
be connected with a pressure-regulating device. The edges of the holes should be sharp, and the hole
axis should be normal to the local tangent overlay surface. Typical diameters of the holes for pressure
distribution range from 0.35 mm to 1.5 mm, and their position should be in accordance with size and
particular requirements of a given model. These requirements are most easily met using metal plugs,
as shown in Fig. 2c). They should be put into the hole that has already been bored on the model
surface, and subsequently glued with two-component glues. On cap support, metal tube should be
glued, wtubes other end is connected with a plastic pneumatic tubes connecting measuring point with
a sensor for pressure measurement. Cap-metal insert hole on surfaces should be bored vertically to
tangent line at that point.
In the train-model body, measurement points are connected with two devices for multiplexing of
pressures of Scanivalve type, at active side of a differential pressure-indicator [4].
The train model has been positioned on the support, enabling the alteration of slip angle , i.e.
simulation of speed direction alteration, at height of 40 mm from the platform, simulating the trainrelated
ground effect. Two gaps (slots) have been made on the platform, perpendicular to the flow
direction, for boundary layer exhaust.
Holes for measuring pressure
distribution
a)
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