Within the European ICE-GENESIS project, the deliverable D5.3 is closely related to Task 5.2 of work package WP5. This task is dedicated to instrumentation assessment and selection for IWT calibration, in particular:
a) State of the art and discussion of the specification of the needs for IWT snow measurements
b) Review of the available instrumentation for artificial snow particle properties and bulk snow water content measurements (ground-based instrumentation, particularly adapted for use in wind tunnels), and also snow cloud homogeneity (e.g. laser sheet).
c) Selection of most suitable calibrated instrumentation for IWT calibration.
In a first step WP5 supports developing snow test capabilities and/or upscaling of IAG snow fall technology by assessing snow representativeness of artificially produced innovative natural like snow in IAG Climatic Chamber. This first step will not yet take into account potential fragmentation effects of ice particles once injected in high speed wind tunnels. For assessing the representativeness of artificially produced ice particles, the deployment of a multi-angle snowflake camera (MASC) has been suggested in the ICE GENESIS proposal. The MASC instrument is a recently developed sophisticated multi angle imaging instrument with in total 3 greyscale camera systems. In past few years first datasets of natural ice particles were gathered with the MASC instrument in the scientific community (also EPFL partner of the ICE GENESIS project). Additional MASC data (natural and artificial ice particles: by EPFL and CNRS partners) will be gathered during ICE-GENESIS in order to compare natural ice with artificially generated ice particles. Unfortunately, the MASC has been designed for vertically falling snow, but is not adapted (and therefore cannot be used) for use in wind tunnels with ice particle velocities far beyond fall velocities. Also we will not discuss in detail the selection of the MASC instrument for this preliminary study of falling snow (see Task 5.3 of DoW).
In a second step, RTA will upscale/integrate the IAG snow generation system in their Climatic Wind Tunnel and WP5 will provide support to assess number PSD and TWC with adequate instrumentation. Mainly in this context the Task 5.2 with D5.3 is dedicated assessing and selecting IWT snow instrumentation for final IWT calibration.
Since also TsAGI and NRC work on snow test capability developments within WP7, the snow instrumentation assessment and selection for PSD, IWC, and artificial snow cloud homogeneity, concurrently benefits to those two international partners.
The work performed in order to produce the deliverable D5.3 is entirely related to the choice of most suitable instrumentation for snow microphysics research on IWT research facilities, which means different IWT facilities (of RTA, TsAGI, and NRC) have to take into account installation possibilities and constraints of homogeneous sampling area (has to be known).
