NASA Technical Reports Server (NTRS) 19930004201: Analysis of a space emergency ammonia dump using the FLOW-NET two-phase flow programReport as inadecuate




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Venting of cryogenic and non-cryogenic fluids to a vacuum or a very low pressure will take place in many space-based systems that are currently being designed. This may cause liquid freezing either internally within the flow circuit or on external spacecraft surfaces. Typical ammonia flow circuits were investigated to determine the effect of the ge

Author: NASA Technical Reports Server (NTRS)

Source: https://archive.org/


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N93 ANALYSIS OF A SPACE EMERGENCY FLOW-NET TWO-PHASE THE AMMONIA FLOW 1 DUMP 38, USING PROGRAM J.
Navickas McDonnell Douglas Space Huntington Systems Beach, W.C. Mechanical Company California Rivard Engineering University Department of Maine ABSTRACT Venting of cryogenic space-based and non-cryogenic systems that fluids are currently being to a vacuum designed. or a very low pressure This may cause within the flow circuit or on external spacecraft surfaces. Typical to determine the effect of the geometric configuration and initial on the freezing applicability liquid characteristics of the system. of the FLOW-NET program. fractions inception before freezing of freezing. occurs. of an ammonia and expanding line cross program tank, sections initially that a typical very small provided filled either with liquid, the ranges can be vented in the flow circuit over broad ranges of to very low can hasten the of system through internally were investigated and void fraction also to investigate system restrictions solutions completely to near-vacuum freezing ammonia flow circuits temperature, pressure, was conducted It was shown However, The FLOW-NET such as venting The analysis liquid will take place in many a series conditions, of contracting conditions. INTRODUCTION Freezing a concern may of either a cryogenic in the design be necessary. emergency, or a non-cryogenic of the space For instance, liquid delivered liquid the fluid during storage Space to orbit may have systems. Station venting There ammonia to be dumped to a low pressure are many loop during may situations have environment where to be vented a shuttle emergency, is such venting during an or liquid may have to be transferred from a high-pressure supply tank to a tank at a low pressure. During the design phases such orbital liquid systems the question is often asked whether most of t...






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