A method and device for measuring powder mass flow rate of a powder engine

By setting up a pressure sensor between the powder box and the collection container, combining the ideal gas state equation and piston displacement speed to calculate the powder mass flow rate, the accuracy and efficiency problems of powder mass flow measurement in the powder engine in the prior art are solved, and direct and accurate powder mass flow measurement is achieved.

CN115144043BActive Publication Date: 2025-04-01NORTHWESTERN POLYTECHNICAL UNIV
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Patent Information

Application Number
CN202210692788.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-06-17
Publication Date
2025-04-01
Estimated Expiration
2042-06-17

AI Technical Summary

Technical Problem

The existing powder mass flow measurement methods of powder engines have problems such as long response time, poor repeatability, low measurement accuracy and high equipment costs, which are difficult to meet the precise measurement requirements of powder mass flow during operation of powder engines.

Method used

By connecting the powder box and the collection container, the pressure sensor is used to measure the gas pressure and volume in the powder box and the collection container, combined with the ideal gas state equation and piston displacement speed, the formula for the mass flow of the powder is calculated to achieve direct measurement of the powder mass flow of the powder engine.

Benefits of technology

It realizes direct and accurate measurement of the powder mass flow rate of the powder engine, reduces measurement errors, and is suitable for the working conditions of the powder engine.

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Abstract

The present invention discloses a method and device for measuring the mass flow rate of powder in a powder engine, as follows: a powder box and a collecting container are connected by pipeline, the powder box is filled with metal powder, and fluidizing gas is introduced, the gas carries the metal powder into the collecting container; the initial mass of the metal powder is measured as m p0 ; Measure the gas pressure and gas volume in the powder box as P 1 and V g1 ; The pressure and gas volume in the collection container are P 2 and V g2 ; The mass flow rate of the gas is #imgabs0# The formula for the mass flow rate of powder in the collection container is: #imgabs1##imgabs2# Where: P′ 1 and P′ 2 P 1 and P 2 The derivative with respect to t; r 1 is the radius of the powder box circular section; V is the piston displacement speed, V 1 and V 2 are the volumes of the powder box and the collection container respectively; ρ p is the material density of the powder particles, V p is the volume of powder. This method can be used to directly measure the mass flow rate of powder in powder engine.
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