RAIN SIMULATION IN TRANSONICS FLOWS

Award Information
Agency:
Department of Defense
Branch
Air Force
Amount:
$749,949.00
Award Year:
1997
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Award Id:
25770
Agency Tracking Number:
25770
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
P.O. BOX 3073, Princeton, NJ, 08543
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Alan J. Bilanin
(609) 734-9282
Business Contact:
() -
Research Institute:
n/a
Abstract
Erosion of aerodynamic components by rain has traditionally been studied with a rotating arm, where the component is swung into a water spray simulating rainfall. This method, for obvious reasons, is not well suited for testing componets that are large and heavy. Arnold Engineering Development Center (AEDC) has a need for a steady state test facility capable of simulating rain (up to transonic speeds) impacting aircraft components and materials. A system is proposed herein which will typically produce, 1.5mm rain droplets and a liquid water content of approximately 20gm/m3 which is prototypical of a very heavy shower. The proposed system utilizes a novel spray nozzle which discharges a laminar water jet at supercritical Reynolds Numbers. The Phase I effort will demonstrate the system transonically and measure droplet size distribution, droplet speed and liquid water content in the speed range Mach number 0.3 - 0.9. The measured droplet size spectra will be compared against measured rainfall spectra. Lastly, the system which will be developed and demonstrated is expandable to facilities where large components can be tested.

* information listed above is at the time of submission.

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