Unsteady Pressure Loads in a Generic High Speed Engine Model PDF Download
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Author: Tony L. Parrott
Publisher:
ISBN:
Category : Noise control
Languages : en
Pages : 84
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Author: Tony L. Parrott
Publisher:
ISBN:
Category : Noise control
Languages : en
Pages : 84
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722853969
Category :
Languages : en
Pages : 82
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Book Description
Unsteady pressure loads were measured along the top interior wall of a generic high-speed engine (GHSE) model undergoing performance tests in the combustion-Heated Scramjet Test Facility at the Langley Research Center. Flow to the model inlet was simulated at 72000 ft and a flight Mach number of 4. The inlet Mach number was 3.5 with a total temperature and pressure of 1640 R and 92 psia. The unsteady pressure loads were measured with 5 piezoresistive gages, recessed into the wall 4 to 12 gage diameters to reduce incident heat flux to the diaphragms, and distributed from the inlet to the combustor. Contributors to the unsteady pressure loads included boundary layer turbulence, combustion noise, and transients generated by unstart loads. Typical turbulent boundary layer rms pressures in the inlet ranged from 133 dB in the inlet to 181 dB in the combustor over the frequency range from 0 to 5 kHz. Downstream of the inlet exist, combustion noise was shown to dominate boundary layer turbulence noise at increased heat release rates. Noise levels in the isolator section increased by 15 dB when the fuel-air ratio was increased from 0.37 to 0.57 of the stoichiometric ratio. Transient pressure disturbances associated with engine unstarts were measured in the inlet and have an upstream propagation speed of about 7 ft/sec and pressure jumps of at least 3 psia. Parrott, Tony L. and Jones, Michael G. and Thurlow, Ernie M. Langley Research Center...
Author:
Publisher:
ISBN:
Category : Technology
Languages : en
Pages : 1454
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Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 720
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Book Description
February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1786
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 686
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Author:
Publisher:
ISBN:
Category : Rocketry
Languages : en
Pages : 822
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Author:
Publisher:
ISBN:
Category : NASA tech briefs
Languages : en
Pages : 180
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 820
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