Automatic calibration system and automatic calibration method for sonic nozzle

Abstract

An automatic calibration system and automatic calibration method for sonic nozzle are mainly used for calibrating the flow characteristics of a flow controller (sonic nozzle) in gas propellant feedingsystem of the rocket engine and can improve the manual operation in the traditional calibrating process as automatic operation controlled by a computer. The automatic calibration system for sonic nozzle is formed by connecting an oxygen storage tank, a fixed supply type electrically controlled decompressor, a pressure sensor, a temperature sensor, a measured sonic nozzle, a flowmeter, a control valve, a data collecting device, a valve drive device and a computer in series. An automatic calibrating software is used for driving the fixed supply type electrically controlled decompressor throughthe valve drive device; and the fixed supply type electrically controlled decompressor is used for adjusting the size of the pressure of entrance of the sonic nozzle. The sensor and the data collecting device are used for measuring the parameters of measured sonic nozzle such as entrance pressure and flow rate; and the automatic calibrating software is used for displaying and recording in real time.

Description

【Technical field】 [0001] The invention relates to a propellant conveying system for a ground test of a rocket engine, and is mainly used for calibrating the flow characteristics of a flow controller (sonic nozzle) of a gas propellant. 【Background technique】 [0002] The sonic nozzle is an important part in the gas propellant (such as oxygen, etc.) delivery system, and its function is to control the flow. The structure of the sonic nozzle is as follows figure 1 As shown, it is a Rafal nozzle that contracts first and then expands. The gas propellant flows from left to right, and the section with the smallest flow area is called the throat. The flow control principle of the sonic nozzle can be expressed by the flow formula: [0003] m · = μK P T A - - - ( 1 ) [0004] In the fo...

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Problems solved by technology

[0019] figure 2 In the calibration system shown, the pressure reducer 4 must be adjusted for the inlet pressure P of each sonic nozzle. After the adjustment, the solenoid valve 9 is opened and the data is recorded. However, the calibration of a sonic nozzle often needs to observe and record dozens of different The inlet pressure and flow data of figure 2 The system and method shown need to repeat the process of manually adjusting the pressure reducer and switching the valve dozens of times, which is time-consuming and labor-intensive

And considering safety, the calibration system and the valve control device are often not on the same site, and the two have to be separated by a certain distance. Therefore, at least two people are required to operate the calibration of the sonic nozzle, one person adjusts the pressure reducer, and one person switches the valve and collects data. , and the two must maintain communication, which makes the calibration efficiency relatively low

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