Flow Quality Survey of the 9- by 15-Foot Low Speed Wind Tunnel (2015 and 2016 Tests) Prior to Acoustic Improvement Modifications

Johnson, Aaron M

关键词: BOUNDARY LAYERS;    CALIBRATING;    CHARACTERIZATION;    FLOW CHARACTERISTICS;    FLOW MEASUREMENT;    LOW SPEED WIND TUNNELS;    PRESSURE DISTRIBUTION;    STATIC PRESSURE;    TEST CHAMBERS;    TURBULENT FLOW;    WIND TUNNEL CALIBRATION;    WIND TUNNEL TESTS;    YAW;   

RP-ID  :  NASA/CR-2019-219983,E-19590,GRC-E-DAA-TN53334

学科分类：航空航天科学

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

A flow quality survey (FQS) was conducted in December 2015 and January 2016 to characterize the flow quality of the 9- by 15-Foot Low-Speed Wind Tunnel (9×15 LSWT) test section prior to the start of significant structural and acoustic modifications. The data from this FQS will be compared with data collected during a replicated FQS after completion of the acoustic improvement modifications. This document contains only the FQS data collected in December 2015 and January 2016 using the 15-ft survey rake and the 18-in. boundary layer rakes in the 9×15 LSWT. The spatial variation at one axial test section station (TSTA), nominally TSTA 198, and five vertical heights of the 15-ft survey rake was computed for Mach number, velocity, total and static pressure, total temperature, and flow angularity (pitch and yaw). Three hot-wire probes mounted to the 15-ft survey rake were used to measure turbulence intensity; however, data from a previous test entry were used as the mean turbulence intensity baseline value, as there were issues with the hot-wire performance. The boundary layer pressure profiles around the perimeter of the test section at TSTA 199 were also measured and the boundary layer heights computed. All calculated results are tabulated for each facility condition set point.