Drag force on quasi-axisymmetric scramjets at various flight Mach numbers: theory and experiment |
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Authors: | Katsuyoshi Tanimizu David J Mee Raymond J Stalker Peter A Jacobs |
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Institution: | (1) Division of Mechanical Engineering, Centre for Hypersonics, The University of Queensland, Brisbane, 4072, Australia |
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Abstract: | The net axial force on a non-fuelled quasi-axisymmetric scramjet model designed for operation at Mach 6 was measured in the
T4 Stalker tube at The University of Queensland using a single-component stress wave force balance. The design used was a
variant of a model that was tested previously at Mach 6. The new model was equipped with a modified thrust nozzle that was
designed to improve the performance of the nozzle. Tests were performed to measure the drag force on the model for Mach 6,
Mach 8 and Mach 10 shock tunnel nozzles for a range of flow conditions. The nozzle-supply enthalpy was varied from 3 to 10 MJ/kg
and the nozzle-supply pressure from 35 to 45 MPa. For the test model, the drag coefficient increased with increasing nozzle-supply
enthalpy. The test results are compared with a force prediction method based on simple hypersonic theories and three-dimensional
CFD. The test results are in good agreement with the predictions over the wide range of conditions tested. The re-designed
model has a more efficient nozzle but this comes at the expense of increased drag associated with the modifications required
for the cowl. The results indicate that this type of vehicle design is not likely to be suitable for flight above Mach 8.
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Keywords: | Scramjet Force measurement Flow visualization |
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