Slider type Mach-number-variable spray pipe and wall determination method thereof

A technique for determining the method and Mach number, which is applied to injection devices, injection devices, etc., can solve the problems of high non-uniformity of Mach number at non-design points and poor flow field quality, and achieve simple structure, overcome flow field inhomogeneity, Easy to control effects

Active Publication Date: 2013-06-12
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0006] The purpose of the present invention is to provide a slider type variable Mach number nozzle and its wall surface determination method to solve the pr

Method used

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  • Slider type Mach-number-variable spray pipe and wall determination method thereof
  • Slider type Mach-number-variable spray pipe and wall determination method thereof
  • Slider type Mach-number-variable spray pipe and wall determination method thereof

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Embodiment Construction

[0024] Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0025] In the present invention, the Mach number of the supersonic section is greater than 1.2, the Mach number of the subsonic section is less than 0.8, and the Mach number of the transonic section is between 0.8 and 1.2.

[0026] The value of the unit precession distance is selected by the vertical distance from the end point of the fixed wall curve far away from the outlet to the slider wall curve through the constraint of the expansion ratio.

[0027] According to an embodiment of the present invention, the wall surface of the slider type variable Mach number nozzle is determined by the following method.

[0028] Firstly, the relationship curve X-Ma between the precession distance of the slider ...

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Abstract

The invention provides a slider type Mach-number-variable spray pipe and a wall determination method thereof. The wall determination method of the slider type Mach-number-variable spray pipe comprises according to structural design requirements of the spray pipe, determining partial wall curve as a fixed wall curve, and determining a slider guide rail wall line, a slider wall curve, and a relation curve between a procession distance and an exit Mach number; according to the relation curve between the procession distance and the exit Mach number, using a characteristics method to determine a corresponding wall curve to be solved when the slider is located in a current position; changing the slider position on the slider guide rail to enable a currently designed Mach number value interval to cover all values of the exit Mach number in the relation curve between the procession distance and the exit Mach number, and determining each section of the wall curve to be solved; and determining the wall curve of the spray pipe according to the slider guide rail wall line, a fixed wall curve, the slider wall curve, and each section of the wall curve to be solved. The exit fluid field of the spray pipe determined with the method is high in uniformity, and the exit Mach number can well accord with an exit Mach number given in advance.

Description

technical field [0001] The invention relates to the technical field of supersonic nozzle design, in particular to a slider-type variable Mach number nozzle and a method for determining its wall surface. Background technique [0002] Supersonic nozzles are widely used in high-speed aircraft, rockets, supersonic wind tunnels, high-energy lasers, ejector vacuum pumps and other equipment. The quality of the nozzle flow field has an important impact on the performance of the equipment. Obtaining an appropriate nozzle wall curve through certain design techniques can greatly improve the quality of the nozzle flow field, improve equipment performance, and save research funds. The supersonic nozzle is generally composed of a constriction section and an expansion section. Driven by a certain pressure, the gas gradually accelerates in the constriction section and reaches the speed of sound near the throat, and then continues to accelerate in the expansion section until the required Mac...

Claims

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Application Information

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IPC IPC(8): B05B1/34
Inventor 赵玉新王振国
Owner NAT UNIV OF DEFENSE TECH
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