Accession Number:

ADA139566

Title:

Nozzle Tests for Simulating Heavy Rain in a Wind Tunnel

Descriptive Note:

Final rept. Feb 1983-Feb 1984

Corporate Author:

DAYTON UNIV OH RESEARCH INST

Personal Author(s):

Report Date:

1984-01-01

Pagination or Media Count:

31.0

Abstract:

Tests were conducted with a vibrating tube nozzle system to assess the ability of the system to realistically simulate the natural heavy rain environment at wind tunnel airspeeds of 65 to 125 mph. The nozzle system was specifically designed to achieve the large droplet sizes -2mm that are characteristic of the heavy rain environment. The nozzle system also produced the appropriate total water volume to simulate rain rates from 25 mmhr to over 500 mmhr. The test results established the allowable velocity differential between the airstream and water velocity that resulted in large droplet formation. Velocity differentials exceeding the allowable or critical value resulted in the shattering of large drops into a spectrum of much smaller drops.

Subject Categories:

  • Aircraft
  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE