Yongmin Jun, Inyoung Yang, Chun Taek Kim, Soo Seok Yang, Dae Sung Lee
International Journal of Aeronautical and Space Sicences, vol. 5, no. 1, pp.46-56, 2004

Abstract : The verification and improvement of the measurement uncertainty have been performed in the altitude test facility for small gas turbine engines, which was built at the Korea Aerospace Research Institute (KARl) in October 1999. This test is performed with a single spool turbojet engine at several flight conditions. This paper discusses the evaluation and validation process for the measurement uncertainty improvements used in the altitude test facility. The evaluation process, defined as tests before the facility modification, shows that the major contributors to the measurement uncertainty are the flow meter discharge coefficient, the inlet static and total pressures, the cell pressure and the fuel flow rate. The measurement uncertainty is focused on the primary parameters of the engine performance such as airflow rate, thrust and specific fuel consumption (SFC). The validation process, defined as tests after the facility modification, shows that the measurement uncertainty, in seal level condition, is improved to the acceptable level through the facility modification. In altitude test conditions, the measurement uncertainties are not improved as much as the uncertainty in sea level condition

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