Density measuring method suitable for single-phase flow fluid and measuring device thereof

A density measurement and flow type technology, which is applied to determine the specific gravity and other directions by using the flow characteristics of the fluid, can solve the problems of complex and expensive devices, inaccurate density measurement, etc., to improve the measurement range, simple and convenient operation, reduce gas heat conduction and Effect of convective heat loss and radiation heat loss

Inactive Publication Date: 2011-01-05
BEIHANG UNIV
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Problems solved by technology

[0003] Aiming at the problem that the device required for the measurement of aviation kerosene physical property data under supercritical pressure is very complex and expensive, and the density measurement is inaccurate under high temperature and high pressure, the invention provides a density measuring device suitable for single-phase flow type fluids under variou

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  • Density measuring method suitable for single-phase flow fluid and measuring device thereof
  • Density measuring method suitable for single-phase flow fluid and measuring device thereof
  • Density measuring method suitable for single-phase flow fluid and measuring device thereof

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Embodiment Construction

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0021] Density measuring method of the present invention: adopt thermocouple to measure single-phase fluid from the time t required for the test section inlet to flow to the test section outlet, the mass flow rate of fluid Measured by the mass flow meter, the inner diameter H of the experimental section and the length L of the experimental section are measured by a caliper, and the density of the single-phase fluid is obtained according to the law of constant flow mass conservation in fluid mechanics The definition of constant flow mass flow in fluid mechanics is: in is the mass flow rate, the international unit is kg / (m 3 h), ρ is the fluid density, U is the fluid velocity, and A is the flow channel cross-sectional area, The flow velocity U of the fluid can be calculated from the length of the flow channel and the time required for the fluid to flow ...

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Abstract

The invention discloses a density measuring method suitable for single-phase flow fluid and a measuring device thereof. In the density measuring method, the flow speed of single-phase fluid in an experimental section is mainly calculated according to the response time difference of thermoelectric couples at the inlet and outlet of the experimental section based on the principle of mass conservation of steady flow in fluid mechanics and mass flow and other relevant data are measured, so that the density of the single-phase fluid is calculated. The inside of the measuring device for applying the method is vacuumized, a heat-shielding screen is arranged in a vacuum cavity and the experimental section is arranged in the heat-shielding screen, so that convective heat exchange loss and radiation heat loss are reduced effectively and correct density experimental data can be obtained. The method has simple and convenient operation and is suitable for measuring the density of the single-phase fluid under various pressures and at various temperatures.

Description

technical field [0001] The invention relates to a method suitable for measuring the density of a single-phase flow type fluid. The method is based on the constant flow mass conservation law of fluid mechanics to measure the density of a single-phase fluid under different pressures and temperatures. It is mainly used in aerospace and petrochemical industries. Related fields of hydrocarbon fuel property data. Background technique [0002] With the increase of the temperature before the turbine of the aero-engine and the boost ratio of the compressor, the temperature of the cooling air drawn from the rear stage of the compressor also increases gradually, which will lead to a decrease in the cooling quality of the cooling gas, which will bring extreme damage to the cooling of the hot-end parts of the engine. big challenge. In the case that the amount of cooling air and the cooling structure cannot be greatly changed in a short period of time, using the high heat sink characteri...

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Application Information

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IPC IPC(8): G01N9/32
Inventor 徐国强张春本邓宏武吴翰陶智张斌
Owner BEIHANG UNIV
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