| 1.2m trisonic wind tunnel is a sub-tran-super sonic wind tunnel scaled in1.2m,which was designed and constructed by China Academy of Aerospace Aerodynamics.The thesis reports the research on the quality of subsonic and transonic and supersonicflow fields in this tunnel. Through the uniformity test research on the flow fields of foursets of supersonic nozzles with Mach numbers of1.5,2.0,3.0,4.0, test regions of modelwere determined, and then the parameters which reflect the uniformity of the flow fieldswere obtained in the test region of model, such as average Mach number,square-mean-root deviation of Mach number, deviation of Mach number and axialgradient of Mach number. Through the test of the standard model AGARD-B insupersonic flow fields, the aerodynamic-force performances of flow fields wereexamined, and then the average airflow deflection angle of flow fields was obtained.Through the uniformity test research on the sub-tran sonic flow fields, test regions ofmodel and the reference points of Mach number were first determined, and then theparameters which reflect the uniformity of the flow fields were obtained in the testregion of model. Through the test of wave-eliminating characteristics of ventilatingwalls, wave-eliminating characteristics of ventilating walls of the transonic test sectionwere determined. Through the test of the standard model AGARD-B in subsonic andtransonic flow fields, the aerodynamic-force performances of the flow fields wereexamined, and then the average airflow deflection angle of flow fields was obtained.The basic information, facility for the test of flow fields, ways of the test and testdata calculation of the1.2m trisonic wind tunnel are introduced in the thesis. The resultsof flow field quality tests are presented in tables and curves. Based on the detail analysisof these results, it is concluded that the quality of the flow fields of1.2m trisonic windtunnel can satisfy the requirements of GJB1179-91, and the tunnel is qualified toconduct model tests. |
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