Scientific and Technical Aerospace Reports
Scientific and Technical Aerospace Reports

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Published: 1990

Total Pages: 976

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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

The Conversion of Aircraft Ice Crystal Measurements Into Terms of Liquid Water Using Simulated Data
The Conversion of Aircraft Ice Crystal Measurements Into Terms of Liquid Water Using Simulated Data

Author: Robert O. Berthel

Publisher:

Published: 1981

Total Pages: 52

ISBN-13:

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This investigation presents simulated environments of ice crystals to computer analysis as a means of imitating particle measurements made by electro-optical devices such as the Particle Measuring System's 1-D instrument. A mathematical model is developed so that single crystals of known geometric form can be processed by considering each crystal's spatial relationship to the assumed measuring instrument. Crystal orientation is defined using a random number technique. The results of the assumed measurements are converted into mass of equivalent liquid water by different methods and are compared with the known mass of the simulated environment. Relationships are derived for the conversion of several forms of single ice crystals into terms of equivalent melted diameters of liquid water and a comparison is made between the mass calculated from the derived equations with the conversion equations relating measured length to equivalent melted diameter currently in use.

Accessions List
Accessions List

Author: Environmental Science Information Center. Library and Information Services Division

Publisher:

Published: 1984

Total Pages: 16

ISBN-13:

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Some Microphysical Processes Affecting Aircraft Icing
Some Microphysical Processes Affecting Aircraft Icing

Author: Hugh J. Sweeney

Publisher:

Published: 1985

Total Pages: 52

ISBN-13:

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This report summarizes work done as part of the aircraft icing probabilities program. It contains a look at icing in layer-type clouds, a comparison of Particle Measuring System (PMS)2-D data from two flights. and a look at additional data obtained from researchers in the Federal Republic of Germany. The parameters measured in a warm and cold layer-type cloud near Peoria, IL are analyzed and compared. Liquid water content (LWC), cloud depth, particle diameter and particle concentration are compared. Variations of these parameters are compared. In mature clouds, where droplet sizes are approximately equal, the LWC is directly related to the number concentration. The icing rate, LWC and droplet size all increase as a function of height above cloud base. Synoptic patterns and PMS 2-D data obtained on two flights are compared. The first flight, made near Greensboro, NC was in an area of heavy precipitation. The large particles present produced very little icing. The other flight, near Flint, MI was in an area which was experiencing only spotty precipitation. The aircraft, however, experienced moderate icing. Data gathered on aircraft observations in the Federal Republic of Germany are examined. The data show that in strong icing situations, there are many particles with diameters of 10 to 20 microns. The results match those obtained by our research flights. Keywords: Cloud physics; Aviation meteorology; Particle distribution.