Characterization of Dryout Point in the Vaporizing Liquid Microthruster
| Autor: | David Bame, Amy Green, Juergen Mueller, Ryan McDevitt, John J. Blandino |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Phase boundary
Phase transition Materials science Mechanical Engineering Mass flow Flow (psychology) Aerospace Engineering Video microscopy Heat transfer coefficient Mechanics Characterization (materials science) Volumetric flow rate Fuel Technology Space and Planetary Science Mass flow rate Point (geometry) |
| Zdroj: | Journal of Propulsion and Power. 22:677-683 |
| ISSN: | 1533-3876 0748-4658 |
| Popis: | A specially designed vaporizing liquid microthruster (VLM) with a Pyrex cover glass to provide optical access has been used to investigate the two-phase flow of water through the heated channel, which is approximately 700 μm wide and 300 μm deep. The design and calibration of a feed system to control mass flow to the VLM in the range of 75-250 μg/s is described along with the video microscopy system used for optical imaging of the phase transition within the channel. Images are presented showing the flow structure during the initial vapor formation, a pulsing mode of operation, and unsteady interaction between individual vapor packets within the channel. As the flow rate is increased from 135-175 μg/s at a heater power of 0.85 W, the location of phase boundary (dryout point) is found to move downstream by approximately 1 mm. Two candidate flow instabilities that could account for the observed unsteady behavior are discussed as well. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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