Validating Arc-jet Condition Targets Using Inverse 1D Material Response Models

L P Askins; A Martin; B Libben; G Palmer; J Williams

NASA NTRS · 20210023969

Validating Arc-jet Condition Targets Using Inverse 1D Material Response Models

L P Askins·A Martin·B Libben·G Palmer·J Williams

Abstract

Experiments were conducted using both the Interaction Heating Facility (IHF) and Aerodynamic Heating Facility (AHF), two hypersonic arc-jet facilities at NASA Ames. These tests were run to understand the material response of ablative thermal protection system materials by exposing them to high-enthalpy flows. Using thermocouple data from the materials, test conditions were inversely determined and compared with expected results from a one-dimensional model using facility target conditions; this allowed an approximate environmental scale factor to be determined and applied to more accurately predict material response in additional tests.

Explore related subjects

material response arcjet thermophysics heat transfer

Keep this discovery

Explore connections, maps & timelines

BibTeX RIS

L P Askins, A Martin, B Libben, G Palmer, J Williams. Validating Arc-jet Condition Targets Using Inverse 1D Material Response Models. https://ntrs.nasa.gov/citations/20210023969

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related reports

NASA NTRS2018

Material Response Analysis of a Titan Entry Heatshield

Accurate calculation of thermal protection material response is critical to the vehicle design for missions to the Saturn moon Titan. In this study, Icarus, a three-dimensional, unstructured, finite-volume material response solver under active development at NASA Ames Research Center, is used to compute the in-depth material response of the Huygens spacecraft along its November 11 entry trajectory. The heatshield analyzed in this study consists of a five-layer stack-up of Phenolic Impregnated Carbon Ablator (PICA), aluminum honeycomb, adhesive, and face sheetmaterials. During planetary entry, the PICA outer layer is expected to undergo pyrolysis. A surface energy balance boundary condition that captures both time- and spatial-variance of surface properties during entry is used in the simulation.

material response↗

NASA NTRSDate not supplied

Overview of the Material Response Code Icarus

Icarus is a material response code capable of modeling the in-depth heat transfer for multi-dimensional, ablative and non-ablative thermal protection systems. Since the initial release of Icarus, several improvements have been made to increase the robustness, performance, and modeling capability of the tool. This paper will review the capabilities of Icarus, discuss results from recent validation exercises highlighting current modeling capability, and summarize the current and future development efforts.

material response↗