NASA SBIR 2019-II Solicitation

Proposal Summary

 19-2- Z10.01-2859
 Cryogenic Fluid Management
 Simulation of Chilldown Process with a Sub-Grid Boiling Model
SMALL BUSINESS CONCERN (Firm Name, Mail Address, City/State/Zip, Phone)
Combustion Research and Flow Technology
6210 Keller's Church Road
Pipersville, PA 18947
(215) 766-1520

PRINCIPAL INVESTIGATOR (Name, E-mail, Mail Address, City/State/Zip, Phone)
Dr. Vineet Ahuja
6210 Keller's Church Road
Pipersville, PA 18947 - 1020
(215) 766-1520

BUSINESS OFFICIAL (Name, E-mail, Mail Address, City/State/Zip, Phone)
Neeraj Sinha
6210 Keller's Church Road
Pipersville, PA 18947 - 1020
(215) 766-1520

Estimated Technology Readiness Level (TRL) :
Begin: 4
End: 6
Technical Abstract (Limit 2000 characters, approximately 200 words)

The process of chilling propellant transfer lines, before ignition of liquid rocket engines is initiated is a critical step before launch and in-space propulsion. Similarly, reliable engine operations, require flow to be conditioned, devoid of two-phase content and pool/flow boiling considerations impact cryogenic tank propellant management. The chilling/quenching of propellant lines undergo complex flow patterns involving film boiling, transition boiling, nucleate boiling and single phase convective heat transfer. In Phase I, a mesoscopic boiling model was integrated into a high-fidelity multi-physics simulation framework and quenching of vertical tubes with cryogenic fluids under terrestrial and microgravity conditions were demonstrated. In Phase II, experiments providing data of important sub-model closures involving bubble departure diameter, frequency and nucleation site density for cryogenic fluids are planned.  These measurements aided with machine learning algorithms will help in improving the accuracy of correlations and closure models.  Furthermore, the boiling model will be enhanced involving additional physics related to surface wettability, bubble sliding effects, solid wall quenching etc along with substrate roughness that affects convective heat transfer and nucleation.  Detailed validation studies are planned with hydrogen and nitrogen under normal gravity and microgravity conditions and boiling model framework will be ported to NASA’s codes to support mission related activities.

Potential NASA Applications (Limit 1500 characters, approximately 150 words)

Cryogenic propellant storage and transfer are integral to nearly all NASA’s future human exploration missions. The tools developed here can result in efficient and reliable protocols for propellant transfer addressing important needs for such missions from launch, in-space engine start-up to orbital refueling. Furthermore, pool boiling and flow boiling impact several key elements of propellant tank cryogenic fluid management in microgravity.

Potential Non-NASA Applications (Limit 1500 characters, approximately 150 words)

Since the chilling of transfer lines is an indispensable part of launch, the commercial launch operators can use our prediction tools to estimate propellant quantities and transfer times. Other important applications include the medical industry where applications vary from the preservation of tissues and organs to life-support systems.

Duration: 24

Form Generated on 05/04/2020 06:24:33