Liquid oxygen mass flow measurement method for liquid oxygen kerosene engine test

Abstract

The invention aims to solve the technical problem of large liquid oxygen flow measurement errors of an existing liquid oxygen kerosene engine test and provides a liquid oxygen mass flow measurement method for a liquid oxygen kerosene engine test. The liquid oxygen mass flow measurement method comprises the steps that 1, on-site in-situ calibration is conducted on a turbine flowmeter to obtain an on-site in-situ calibration coefficient x of the turbine flowmeter; 2, a certain amount of liquid oxygen is injected into a liquid oxygen container, a volume flow reading S' of the turbine flowmeter is read after injection is stopped; 3, the temperature T'w and liquid oxygen pressure P'w of the liquid oxygen in a pipeline at an inlet of the turbine flowmeter are measured, and the liquid oxygen density p'w in the pipeline at the inlet of the turbine flowmeter at the moment is checked; 4, the on-site in-situ calibration coefficient x, obtained in the step 1, of the turbine flowmeter is utilized to correct the volume flow reading S' of the turbine flowmeter in the step 2; 5, the liquid oxygen density p'w obtained in the step 3 is multiplied by the volume flow reading S', corrected in the step 4, of the turbine flowmeter in the step to obtain the accurate liquid oxygen mass flow in the pipeline at the inlet of the turbine flowmeter.

Description

technical field [0001] The invention relates to a liquid oxygen mass flow measurement method for a liquid oxygen kerosene engine test. Background technique [0002] One of the purposes of the liquid rocket engine ground test is to evaluate the performance of the engine. The main basis for the evaluation is a large amount of data measured in the engine test, and these data must be accurate and credible. Since there are many factors involved in the flow measurement of cryogenic liquid oxygen, it cannot be obtained accurately by using a mass flowmeter directly like a normal temperature medium. Therefore, accurate measurement of liquid oxygen flow has become a key link in the development of liquid oxygen kerosene engines, which is directly related to the cost and performance of liquid rockets. [0003] At present, the liquid oxygen mass flow rate is obtained by multiplying the volume flow rate measured by the turbine flowmeter and the density calculated by measuring the tempera...

AI Technical Summary

Problems solved by technology

Although the three turbine flowmeters are all qualified products with a calibration accuracy of 0.5% for metering water, the environmental conditions of the site installation and measurement conditions are different, and the media used are different, especially the influence of the low-temperature structural deformation of the flowmeters, resulting in a relatively large measurement value of the turbine flowmeters. large sys

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