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Integrated hot-wire probes for measuring gas flow parameters in mining conditions |
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Integrated hot-wire probes for measuring gas flow parameters in mining conditions Authors:P. Ligęza, E. Poleszczyk
The study outlines the main design objectives, conceptual design and structure of a hot-wire probe
intended for multi-point simultaneous measurements of temperature fi eld and gas fl ow velocity in specifi c
conditions (in industry or in mining).
The probe matrix and the data acquisition system can be employed in portable measurement systems.
The probe structure is outlined and implementations of various probe options are investigated. These
options enable the measurements of temperature, fl ow velocity and detection of the fl ow velocity vector
as well as measurements of fast -changing fl ows. Potential applications of the probe are explored.
Voltage-velocity characteristics U(v) were collected for probes complete with a sensitive element in
the form of a thin platinum-ceramic sensor and for probes for fast-changing fl ow measurements, equipped
with thin metallic hot wire (tungsten wire 5 μm in diameter). Angular characteristics were obtained in
order to optimise the design of a housing that protects the sensitive element. Double measuring heads
are also devised, in which two parallel minute platinum-ceramic sensor enable the detection of the fl ow
velocity vector direction.
These laboratory tests mark a preliminary stage of the whole research program. In the next stage
measurements will be taken in the mining conditions. The designed measuring system shall be applied
to verifi cation of numerical fl ow simulation in a mining excavation.
Keywords: fl ow metrology, multi-point measurements, measuring probe, data acquisition system |
2011