Optimization of Sonic Boom Suppression by Off-Body Energy Deposition

Sonic boom suppression method is the key technology of next generation supersonic aircraft. Low boom mechanism of the off-body energy deposition is analyzed by using the thermal chocking model. The mass flux of energy deposition region is small than no energy deposition region, and off-body energy deposition will induce a bow shock wave. The mechanism of off body energy deposition is similar with quiet spike, so it can be regard as a virtual quiet spike. Off-body energy deposition analysis software is developed based on CFD, waveform parameter method and NSGA-II genetic algorithm. The location coordinate, value, shape and location number of energy deposition are the key parameters in low boom design. Initial pressure of optimized energy deposition decrease near about 54.65 than no energy deposition, and rise time increase 543.2%.

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Multi-fidelity Sonic Boom Minimization of a Supersonic Aircraft by Parametric Wing Shape Design

AIAA Scitech 2021 Forum ◽

10.2514/6.2021-1009 ◽

2021 ◽

Author(s):

Yusuf Demiroglu ◽

Sihmehmet Yildiz ◽

Melike Nikbay

Keyword(s):

Wing Shape ◽

Sonic Boom ◽

Shape Design ◽

Supersonic Aircraft

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EXPERIMENTAL AND NUMERICAL STUDIES OF PRESSURE AND GAP LENGTH EFFECTS ON ENERGY DEPOSITION IN SPARK DISCHARGE

10.46813/2021-131-092 ◽

2021 ◽

pp. 92-97

Author(s):

K.V. Korytchenko ◽

I.S. Varshamova ◽

D.V. Meshkov ◽

D.P. Dubinin ◽

R.I. Kovalenko ◽

...

Keyword(s):

Energy Input ◽

Energy Deposition ◽

Initial Pressure ◽

Numerical Studies ◽

Voltage Probe ◽

Spark Channel ◽

Discharge Gap ◽

Total Discharge ◽

Channel Development

A study of the influence of the discharge gap length and the initial gas pressure on the energy deposition into the discharge channel was done. The study was conducted at the same total discharge energy. It is experimentally shown that the connection of the voltage probe to the discharge circuit significantly affects the discharge current. The determination of the energy deposited into the spark channel is based on the results of numerical simulation of the spark channel development. Experimentally measured discharge currents at different pressures and the gap length were used as initial data for the calculation. Based on the obtained results, it is determined which of the factors (the initial pressure or the gap length) has the strongest influence on the energy input into the spark channel.

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Meteorological Parameters Affecting Supersonic Transport Operations

Journal of Navigation ◽

10.1017/s0373463300042910 ◽

1967 ◽

Vol 20 (1) ◽

pp. 53-63 ◽

Cited By ~ 1

Author(s):

Richard Scherhag ◽

Gunter Warnecke ◽

Werner Wehry

Keyword(s):

Working Group ◽

Meteorological Parameters ◽

Sonic Boom ◽

Atmospheric Ozone ◽

Atmospheric Conditions ◽

Atmospheric Parameters ◽

Free Atmosphere ◽

Supersonic Transport ◽

Supersonic Aircraft ◽

Initial Task

In 1965, following the Eastbourne Conference, the British, French and German Institutes of Navigation formed a Working Group to make a study of the environment in which the supersonic transport will operate and of its implications for the navigation of such aircraft. The Group's initial task has been one of education, largely through discussion of a series of papers submitted to it. Some of the papers considered have already been published in the Journal (Vol. 19) and a further selection is published below. Table I was contributed by Mr. G. E. Beck. The illustrations to these papers have not all been reproduced.1. Atmospheric Conditions. It will be useful to distinguish between different kinds of atmospheric influences on supersonic aircraft operations. They may be classed as follows:(a) Sporadic effects near the ground(b) Sporadic effects in the free atmosphere(c) Effects on sonic boom(d) Effects of atmospheric ozone(e) Permanently effective atmospheric parameters, such as temperature, density and wind.

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