Call number:
ZSP-201-86/10
In:
CRREL Report, 86-10
Description / Table of Contents:
Icing of a four-bladed rotor was studied under natural conditions at the top of Mt. Washington, N.H. The rotor had two cylindrical blades and two airfoil blades. The results were compared with studies conducted in icing wind tunnels. Considerable differences in icing regimes were observed. For instance, with comparable liquid water content and wind speed the wet-to-dry growth regime transition temperature was up to 10 C higher under natural conditions than in the wind tunnel studies. Results of other studies made under natural conditions were close to those of the present study, indicating that wind tunnel conditions are significantly different from natural conditions. Close examination of the conditions indicated that supersaturation of water vapor existing in most of the wind tunnel studies is the most probable cause of the differences.
Type of Medium:
Series available for loan
Pages:
v, 68 Seiten
,
Illustrationen
Series Statement:
CRREL Report 86-10
URL:
http://hdl.handle.net/11681/9328
Language:
English
Note:
CONTENTS
Abstract
Preface
Introduction
Site weather
Site selection
Equipment
Rotor
Data logger
Rotoscope
Laser profile camera
Thin section preparation
Run procedure
Sample collection and shutdown
Dry runs and static runs
Results and discussion
Wet-to-dry growth regime transition
Stagnation line icing rate
Icing rate on cylindrical and airfoil blades
Liquid water content vs stagnation line icing rate
Droplet capture efficiency index
Temperature rise
Morphological and crystallographic aspects
Summary and conclusion
Literature cited
Appendix A: Chronology of events ..
Appendix B: Narrative description of icing runs
Appendix C: Weather summary sheets for test days
Appendix D: Signal conditioner circuit diagram and sample printout
Location:
AWI Archive
Branch Library:
AWI Library
