FLPP3 WP2 Test Report

Abstract

The DLR Bremen with the Kryo Lab as testing facility provides the service of both static and dynamic cryogenic tests with the cryogenic test demonstrator (CTD). These tests are part of the FLPP3 program and should be made with liquid nitrogen (LN2) as testing fluid and both gaseous nitrogen (GN2) and gaseous helium (GHE) as pressurants. Whereas the former test campaign within WP31320 [RD2] estimated the damping and frequency characteristic of the cryogenic liquid the actual test report within WP31330 deals with static tests of the cryogenic liquid. The aim of these tests is to analyze the filling, draining and stratification behavior of liquid nitrogen with respect to different thermodynamic boundary conditions inside the CTD. Except the initial boiling test all other test cases were performed with a thermally chilled tank. Additionally during all types of tests pressure levels, flow rates of liquid and vapor, wall- and fluid temperatures, liquid fill levels are recorded as well as videos of the CTD (all tests) and the draining line (draining test cases).