Shock-free supersonic elliptic nozzles and method of forming same
First Claim
1. A method of forming an elliptic supersonic nozzle having unequal major and minor axes, comprising the steps of:
- (a) providing design coordinates of a round supersonic nozzle which will translate to the elliptical supersonic nozzle to be formed;
(b) translating the coordinates of the round nozzle into elliptic nozzle coordinates; and
(c) forming the elliptic supersonic nozzle based on the elliptic nozzle coordinates.
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Abstract
A method of forming a shock-free supersonic elliptic nozzle, in which the nozzle to be designed is divided into three sections, a circular-to-elliptic section which begins at a circular nozzle inlet, an elliptic subsonic section downstream from the circular-to-elliptic section and a supersonic section downstream from the elliptic subsonic section. The maximum and minimum radii for each axial point in the circular-to-elliptic section and the elliptic subsonic section are then separately determined, the maximum and minimum radii being the radii for the widest part of an elliptic cross-section and the narrowest part of the elliptic cross-section, respectively. The maximum and minimum radii for each axial point in the supersonic section are determined based on the Method of Characteristics, Then, each of the three sections are based on the maximum and minimum radii for each axial point in the section. The resulting nozzle is acoustically superior.
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Citations
15 Claims
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1. A method of forming an elliptic supersonic nozzle having unequal major and minor axes, comprising the steps of:
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(a) providing design coordinates of a round supersonic nozzle which will translate to the elliptical supersonic nozzle to be formed; (b) translating the coordinates of the round nozzle into elliptic nozzle coordinates; and (c) forming the elliptic supersonic nozzle based on the elliptic nozzle coordinates.
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2. A method of forming an elliptic supersonic nozzle having unequal major and minor axes, comprising the steps of:
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(a) dividing the nozzle to be formed into three sections, a circular-to-elliptic section which begins at a circular nozzle inlet, an elliptic subsonic section downstream from the circular-to-elliptic section and a supersonic section downstream from the elliptic subsonic section; (b) determining the major and minor radii for each axial point in the circular-to-elliptic section, the major and minor radii being the radii for the widest part of an elliptic cross-section and the narrowest part of the elliptic cross-section, respectively; (c) determining the major and minor radii for each axial point in the elliptic subsonic section; (d) determining the major and minor radii for each axial point in the supersonic section; and (e) forming each of the three sections based on the major and minor radii for each axial point in the respective section. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An elliptic jet nozzle, comprising:
- a circular-to-elliptic section attached at an upstream end to a circular inlet;
an elliptic subsonic section having unequal major and minor axes downstream from the circular-to-elliptic section, the elliptic subsonic section having an aspect ratio which is constant for the section and a cross-sectional area which decreases in the downstream direction so that gases leaving the elliptic subsonic section are sonic as they leave; and a supersonic elliptic section in which the gases flowing therein move at supersonic speeds, the supersonic section being downstream from the elliptic subsonic contraction section, having an aspect ratio which is constant for the section and an exit which allows supersonic gases to escape to the atmosphere. - View Dependent Claims (15)
- a circular-to-elliptic section attached at an upstream end to a circular inlet;
Specification