Title page for ETD etd-051199-174419

Document Type thesis

Author Name Newman, Aaron W.

Email Address NewmanAW at navair.navy.mil

URN etd-051199-174419

Title The Effect of Superheat on Liquid Droplets in a Supersonic Freestream

Degree MS

Department Mechanical Engineering

Advisors
Dr. James C. Hermanson, Advisor
Dr. David J. Olinger, Committee Member
Dr. Nikolaos A. Gatsonis, Committee Member
Dr. William W. Durgin, Committee Member

Keywords
droplet injection
supersonic crossflow
superheat
droplet disruption

Date of Presentation/Defense 1999-04-02

Availability unrestricted

Abstract
The effect of superheat on the disruption of liquid droplets in a compressible gas flow was investigated experimentally in a small-scale, supersonic wind tunnel. Aerodynamically generated ethanol droplets of an average diameter of 0.1 mm were injected via a normal sonic jet into a Mach 1.8 freestream. Both nonsuperheated and superheated droplets were injected with initial Weber numbers of approximately 700. The droplets and flow structure were photographed using the shadowgraph method. The relatively high momentum of the liquid droplets typically caused them to pass out of the sonic jet structure. Nonsuperheated droplets showed no signs of disrupting after traveling over 200 mm downstream from the injection point. Only droplets with injection temperatures above the predicted boiling point at tunnel freestream static pressure (48°C) showed signs of disruption, typically after they left the sonic jet structure (30 to 100 mm downstream of the injection point). Droplets in this range of temperatures appeared to begin to boil from the downstream side of the droplet, shedding a vapor cloud before disrupting completely in the chaotic mode. Droplets with temperatures above the boiling point at the exit plane of the sonic jet began to disrupt in the chaotic mode almost instantly (within 1 exit nozzle diameter).

Files
newman.pdf

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Document Type	thesis
Author Name	Newman, Aaron W.
Email Address	NewmanAW at navair.navy.mil
URN	etd-051199-174419
Title	The Effect of Superheat on Liquid Droplets in a Supersonic Freestream
Degree	MS
Department	Mechanical Engineering
Advisors	Dr. James C. Hermanson, Advisor Dr. David J. Olinger, Committee Member Dr. Nikolaos A. Gatsonis, Committee Member Dr. William W. Durgin, Committee Member
Keywords	droplet injection supersonic crossflow superheat droplet disruption
Date of Presentation/Defense	1999-04-02
Availability	unrestricted
Abstract The effect of superheat on the disruption of liquid droplets in a compressible gas flow was investigated experimentally in a small-scale, supersonic wind tunnel. Aerodynamically generated ethanol droplets of an average diameter of 0.1 mm were injected via a normal sonic jet into a Mach 1.8 freestream. Both nonsuperheated and superheated droplets were injected with initial Weber numbers of approximately 700. The droplets and flow structure were photographed using the shadowgraph method. The relatively high momentum of the liquid droplets typically caused them to pass out of the sonic jet structure. Nonsuperheated droplets showed no signs of disrupting after traveling over 200 mm downstream from the injection point. Only droplets with injection temperatures above the predicted boiling point at tunnel freestream static pressure (48°C) showed signs of disruption, typically after they left the sonic jet structure (30 to 100 mm downstream of the injection point). Droplets in this range of temperatures appeared to begin to boil from the downstream side of the droplet, shedding a vapor cloud before disrupting completely in the chaotic mode. Droplets with temperatures above the boiling point at the exit plane of the sonic jet began to disrupt in the chaotic mode almost instantly (within 1 exit nozzle diameter).
Files	newman.pdf