A wide Mach number high enthalpy tube wind tunnel driving tube body

A technology of Mach number and driving tube, which is applied in the field of driving tube body of wide Mach number and high enthalpy tube wind tunnel, which can solve the problem that it is difficult to reproduce the flight environment in pulsed wind tunnel

Active Publication Date: 2019-11-15
AVIC SHENYANG AERODYNAMICS RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to propose a wide Mach number high enthalpy tube wind tunnel drive technology to solve the problem that the existing pulsed wind tunnel is difficult to reproduce the flight environment in the wide Mach number range

Method used

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  • A wide Mach number high enthalpy tube wind tunnel driving tube body
  • A wide Mach number high enthalpy tube wind tunnel driving tube body
  • A wide Mach number high enthalpy tube wind tunnel driving tube body

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Embodiment Construction

[0017] like figure 1 As shown, the wide Mach number high enthalpy tube wind tunnel drive technology proposed by the present invention involves a drive tube body including: a high pressure drive chamber 1 , a slow piston drive section 8 , a cold tube section 9 and an external preheating section 10 . Wherein, the moving piston 3 is contained in the slow piston driving section 8 .

[0018] The high-pressure drive chamber 1 and the slow piston drive section 8 are located upstream of the drive pipe body and are isolated by the upstream diaphragm 4 . During the compression process of the piston 3, the pressure regulating valve 2 is slowly opened, and the pressure difference on both sides of the piston 3 gradually increases. The movement process of piston 3 is determined by the following relational formula:

[0019]

[0020]

[0021] Among them, X(t) is the axial position of piston 3 at time t, V(t) is the moving speed of piston 3 at time t, m is the mass of piston 3, A is th...

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Abstract

The invention belongs to the Mach number test technology field, relates to a wide Mach number high-enthalpy pipe wind tunnel driving pipe body and provides a new driving mode of external pre-heating and slow piston adiabatic compression superposition. Direct external resistance type heating in the Mach number scope of 2-4.5 is carried out, and superposition type heating is employed in the Mach number scope of 4.5-6. The pipe body comprises a high pressure driving chamber, a slow piston driving section, a cooling pipe section and an external pre-heating section, wherein the external pre-heatingsection is close to one side of a downstream jet pipe, and the high pressure driving chamber and the slow piston driving section are arranged at the uppermost body of the pipe body. In low Mach number operation, the slow piston driving section is enclosed, only the cooling pipe section and the external pre-heating section are utilized; in high Mach number operation, all the pipe bodies are utilized, external pre-heating is firstly carried out, and then the test gas temperature is further improved through slow piston adiabatic compression. The pipe body is advantaged in that for the proposed driving technology, the actuating control mechanism is not complex, a slow piston mode is employed, the body contains only a compression wave system, and the driving pipe can bend to flow, so the occupation length of the pipe body is shortened.

Description

technical field [0001] The invention belongs to the technical field of high Mach number test, and relates to a wind tunnel driving tube body of a wide Mach number high enthalpy tube. Background technique [0002] The high-enthalpy pulsed wind tunnel is a kind of high-Mach number ground test equipment. The purpose is to reproduce the flight environment of the aircraft as much as possible, especially the simulation of the flow enthalpy. The shock wave tunnel is the most commonly used high-enthalpy pulse equipment, which relies on the unsteady shock wave motion process to heat the test gas, and has a high enthalpy value. However, due to the "large throat effect" (the diameter of the driven section does not match the throat size of the nozzle), it is difficult to apply it below Mach number 5. [0003] As a special pulse equipment, the tube wind tunnel consists of a long tube with equal diameter, one end is sealed, the other end is equipped with a diaphragm or quick valve, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M9/04
CPCG01M9/04
Inventor 高亮杰钱战森王璐刘愿李雪飞刘中臣
Owner AVIC SHENYANG AERODYNAMICS RES INST
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