Browsing by Author "Ball, Tyler"
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Item CFD Analysis of Loose Water in the EMU(45th International Conference on Environmental Systems, 2015-07-12) Ball, Tyler; Fricker, JohnA computational fluid dynamics (CFD) analysis of water intrusion into the EMU was performed in order to provide a means to visualize and simulate events such as the mishap of July 16, 2013. While several approaches exist for modeling multiphase flow with CFD, the Volume of Fluid (VOF) approach was selected due to its ability to include important features such as surface tension and wall adhesion. Five cases were run and the results of each case were presented and the water transport for each of the five cases was presented in detail. In general, the phenomena associated with water transport (cohesion, adhesion, and capillary effects) were shown to occur in each of the simulations. The water tended to adhere to regions with very low contact angles and regions with high surface contact (i.e. concave surfaces created by ears and jaw line). Some globules were shown to remain in a location for several minutes while others had dynamic movements over only a few seconds. This model helped to confirm and shed new light on what may have happened in the mishap. The model illustrated how water moved around the helmet, including how it accumulated and was ejected from the vent inlet which had not been seen before.Item CFD Analysis Results for CO2 Washout in the Exploration Space Suit(44th International Conference on Environmental Systems, 2014-07-13) Ball, Tyler; Thaker, Amish; Fricker, JohnAn Exploration Space Suit has been modeled using computational fluid dynamics to evaluate options for the orientation and location of the fresh vent gas inlet that provides CO2 (carbon dioxide) washout. A transient, multi-species, sinusoidal breathing model was employed to simulate breathing. Several options were presented which used various methods to aid in washout with the best results coming from what was described as the Tri Vents configuration. Several geometric and metabolic perturbations were imposed on the baseline Tri Vents model to determine the sensitivity of the solution. Turning the head 45° had a similarly negative impact to CO2 washout as breathing primarily out of the mouth. Tipping the head forward was beneficial as it put the face closer to the refreshed gas, while tipping the head forward and pressing the chest against the front of the suit had marginally worse results. Three different metabolic rates were explored and the relationship between metabolic rate and CO2 washout performance was determined.Item Inspiration Mars ETDU Air Management System Test Results(44th International Conference on Environmental Systems, 2014-07-13) Ball, Tyler; Finger, Barry; Junaedi, Christian; Rich, Meagan; Cates, MattThe Inspiration Mars Environmental Contr ol and Life Support Systems (ECLSS) Technology Demonstration Unit (ETDU) program has completed testing six key elements which enable closed loop life support. Of those six elements, four are included in the Air Management System (AMS): CO2 Reduction Assembly (CRedA), CO2 Removal Assembly (CRemA), Oxygen Production Assembly (OPA), and the Trace Contaminant Control Assembly (TCCA). Each of the four assemblies was tested at the Paragon facilities in Tucson and was shown to meet or exceed the key functional requirements for closed loop life support.