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High-temperature jet pipe used for combustion gas flow wind tunnel

A gas flow and nozzle technology, which is applied in aerodynamic tests, machine/structural component testing, measuring devices, etc., can solve the problems of high nozzle loss rate and difficulty in replacement, and save maintenance and operating costs , reduce the difficulty, improve the effect of commonality

Active Publication Date: 2015-12-23
BEIJING AEROSPACE INST OF THE LONG MARCH VEHICLE +1
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a method for compatibility between the combustion chamber and nozzles with different outlet diameters, and solve the problems of high loss rate and difficulty in replacement of nozzles in high-temperature gas flow wind tunnels

Method used

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  • High-temperature jet pipe used for combustion gas flow wind tunnel
  • High-temperature jet pipe used for combustion gas flow wind tunnel
  • High-temperature jet pipe used for combustion gas flow wind tunnel

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Embodiment Construction

[0029] 1. Nozzle design

[0030] 1) The high-temperature nozzle used in the gas flow wind tunnel, including the expansion section and the expansion section, is selectively added to the extension section. The contraction-expansion section includes a contraction section and a transition section, such as figure 2 As shown, the constriction section of the nozzle is designed using the empirical formula of the Witoshinski curve, the transition section is an arc-shaped line, the radius is R, and the center of the circle is located on the longitudinal axis of the throat section.

[0031] see image 3 , the expansion section includes a first expansion section (expansion section I), a second expansion section (expansion section II, III); the profile line of the first expansion section is divided into a circular arc segment and a straight line segment, and the circular arc segment and the transition section For the same arc, the radius is also R, satisfying the relation R≥8R * , R *...

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Abstract

The invention relates to a high-temperature jet pipe used for a combustion gas flow wind tunnel. The high-temperature jet pipe includes a contraction and expansion section and an expansion section; the contraction and expansion section includes a contraction section and a transition section, the front end of the contraction section is connected with a combustion chamber, a contraction section profile satisfies a Witoszynski curve empirical formula, and the rear end of the contraction section is connected to the front end of the transition section; the transition section has an arc-shaped profile, and the radius is R; and jet pipes with different outlet Mach numbers have different outlet section radii, but contraction and expansion section profiles are consistent. For jet pipes of different lengths, extension sections are arranged, when the jet pipes need to be replaced, sizes and positions of pipelines and interfaces of front and rear ends of the jet pipes are kept unchanged, and a relative position of the combustion chamber and a test chamber does not need to be changed, thereby lowering difficulty of replacement of the jet pipes, and improving production and assembling efficiency. Vulnerable parts of contraction and expansion sections of different jet pipes can be mutually replaced, thereby saving maintenance and operation cost of testing equipment.

Description

technical field [0001] The invention relates to a high-temperature nozzle used in a gas flow wind tunnel, belonging to the field of nozzle design. Background technique [0002] The high temperature gas flow wind tunnel is an important ground test equipment for simulating the thermal performance of materials and aircraft in high temperature air flow, and the nozzle is an important component of the main heating system of the high temperature gas flow wind tunnel. The main heater nozzle of the high-temperature gas flow wind tunnel takes into account the two functions of the heater throat and the jet nozzle. It is composed of a contraction section, a throat and an expansion section. Accelerate the gas flow from subsonic speed to sonic speed, and accelerate the adiabatic isentropic expansion of the gas flow to supersonic speed from the throat of the nozzle until the nozzle outlet reaches the Mach number, pressure and temperature required for the test; [0003] The high-temperatu...

Claims

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Application Information

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IPC IPC(8): G01M9/04
Inventor 齐斌邹样辉田宁李荣高强王军李小平岳晖赵玲夏吝时张凯张利嵩王镭曹知红刘召军杨驰那伟
Owner BEIJING AEROSPACE INST OF THE LONG MARCH VEHICLE
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