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Design Method of Slit Nozzle Diffusion Section of Side Force Engine

A design method and engine technology, applied in the direction of machine/engine, rocket engine device, mechanical equipment, etc., can solve the problems of unable to achieve airflow acceleration, unable to meet the large aspect ratio of the nozzle outlet, and achieve the effect of reducing the coupling effect

Active Publication Date: 2018-06-29
SHANGHAI XINLI POWER EQUIP RES INST
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AI Technical Summary

Problems solved by technology

In the existing literature, the super ellipse method is mainly used, and the design method of rectangular rounded corners is used to design the airflow channel of the circular inlet and the rectangular outlet, and the cross-sectional area of ​​the design object is kept constant during the transition process from the circular inlet to the rectangular outlet. , can not achieve the acceleration of the airflow; the other category is to use the two-dimensional nozzle approximate design method, the equal length and equal cross-sectional area conversion method and the three-dimensional nozzle direct design method to design the nozzle surface, but the public literature The length-to-width ratio of the rectangular outlet of the nozzle is small, which cannot meet the requirements of a large aspect ratio (aspect ratio greater than 7) of the nozzle outlet

Method used

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  • Design Method of Slit Nozzle Diffusion Section of Side Force Engine
  • Design Method of Slit Nozzle Diffusion Section of Side Force Engine
  • Design Method of Slit Nozzle Diffusion Section of Side Force Engine

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Embodiment Construction

[0029] Hereinafter, the present invention will be further described in conjunction with the drawings and embodiments.

[0030] First, the rounded rectangle of the transitional section is described by equations.

[0031] figure 1 Schematic diagram of the cross-sectional rounded corner rectangle of the diffuser section of the lateral force engine slit nozzle provided for the embodiment of the present invention. During the design process, the half width of the rectangle is controlled by 1, the half length of the rectangle is 2, and the chamfer radius of the rectangle is 3 To realize the control of the transition section.

[0032] The length and width of the rectangle are controlled by the following formula:

[0033] (1)

[0034] (2)

[0035] in AR(x)=b(x) / a(x) ,in a(x) is the half-width of the rectangle, b(x) is the half-length of the rectangle, at the entrance , the section aspect ratio at the entrance ;exit , the aspect ratio of the section at the exit is ...

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Abstract

The invention discloses a design method for a diffusing section of a narrow-slit spray pipe of a lateral-force engine. According to the design method for the diffusing section of the narrow-slit spray pipe of the lateral-force engine provided by the invention, transition from a circular inlet to a rectangular outlet with a large length-width ratio is realized through rectangular smoothing.

Description

technical field [0001] The invention relates to a design method of a nozzle of a solid rocket motor, in particular to the design of a diffuser section of a slit nozzle of a direct lateral force motor. Background technique [0002] The lateral force engine can effectively improve the maneuverability of the aircraft and increase its survivability, but the coupling effect of the lateral jet flow and the external flow around the aircraft will bring great difficulties to the precise control of the aircraft during use. The above-mentioned problems can be solved by placing the diffuser section of the thrust engine nozzle on the outer surface of the aircraft. In order to adapt to the aerodynamic shape of the aircraft, the outlet of the diffuser section of the nozzle must be designed as a rectangle with a large aspect ratio. [0003] There are no design methods and design criteria for slit nozzles in the current open literature. In the existing literature, the super ellipse method ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02K9/97
Inventor 汤玉林牛禄杨永强李海涛周伟华刘晓丽王勇邹贤
Owner SHANGHAI XINLI POWER EQUIP RES INST
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