feasibility study on nondestructive inspection for regenerative cooled combustion chamber by using neutron diffraction method and neutron radiography testing
- Paper number
IAC-08.C4.3.5
- Author
Mr. Tadashi Masuoka, JAXA, Japan
- Year
2008
- Abstract
The regenerative cooled combustion chamber of a cryogenic liquid rocket engine is exposed to large temperature difference between the hot gas (about 3500K) and the liquid hydrogen (about 20K). It induces thermal stress, and strain is accumulated over cyclic firing tests in the deformed chamber wall. To evaluate strain distribution and deformations of chamber wall is very important since the chamber’s life usually relates to such strain and deformations. To predict the chamber’s life, the finite element analysis (FEM) is often conducted to calculate the strain and the deformations in a chamber wall. However, there are few experimental data to compare with numerical data. The primary objective of this study was to establish a method to obtain the experimental data to compare with the numerical data about the strain and the deformation. In this study, measurements of residual strain in a regenerative cooled combustion chamber wall were tried by applying a neutron diffraction method. At first, the strain measurement by a neutron diffraction method was conducted by using an experimental reactor and facility in Japan Atomic Energy Agency (JAEA). By using such a facility and technique, nondestructive and noncontact measurements of internal residual strain in the chamber could be performed. Furthermore, 2D nonlinear and inelastic FEM analyses were conducted to calculate the residual stress and strain in the chamber. The model in the analysis was same with the chamber specimen’s channel geometry. After strain measurements and FEM analyses, the measured data were compared with the numerical data, and the feasibility of the neutron diffraction method to the regenerative cooled combustion chamber was investigated. In addition, transmission scans for several types of chambers by applying Neutron Radiography Testing were tried to investigate the geometry of chamber walls. In this study, CT scans for chambers were also conducted to inspect shapes of cross section for the chambers.
- Abstract document
- Manuscript document
IAC-08.C4.3.5.pdf (🔒 authorized access only).
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