Restart of a 2D Hypersonic Inlet a Mach 6 using Active Slot Flow Control

Noller, Lachlan (2019) Restart of a 2D Hypersonic Inlet a Mach 6 using Active Slot Flow Control. [USQ Project]

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Optimal scramjet inlet performance is essential for sustained hypersonic flight. Variations from the ideal inlet operating conditions will lead to decreased air compression efficiency. Severe decreases in inlet performance can occur if a scramjet inlet ‘unstarts’. Scramjet engine unstart can occur if the combustion induced pressure rise is too high, or if the angle of attack is beyond its operating limits, or if flight at off-design Mach numbers is attempted. Past research has primarily focused on the development of techniques which prevent unstart from occurring. However, recent research has focused on methods which restart the inlet if it has unstarted. This work primarily focuses on developing a restart mechanism which is able to restart a 2D single ramp hypersonic inlet at Mach 6. Initial investigations were conducted using computational simulation methods to develop potential restart techniques. Experiments were conducted in the TUSQ hypersonic wind tunnel to verify the accuracy of the computational simulations. Results from simulations demonstrated two potential methods of inlet restarting exist: throat suction and sonic injection near the start of the compression surface. Experimental results for the started scramjet inlet matched the simulation reasonably well, however some differences were observed due to transitional boundary layer effects which were not accounted for in the simulations. Opportunities for further work include experimental testing of the proposed restart techniques along with further development of numerical simulations to achieve a more faithful representation of the experimental results.

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Item Type: USQ Project
Item Status: Live Archive
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering (1 Jul 2013 - 31 Dec 2021)
Supervisors: Buttsworth, David; Zander, Fabian; Birch, Byrenn
Qualification: Bachelor of Engineering (Honours) (Mechanical)
Date Deposited: 24 Aug 2021 02:47
Last Modified: 26 Jun 2023 22:59

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