Method for testing crystallization situations of free water in kerosene at different temperatures

A test method and technology of free water, applied in the field of aerospace test, can solve problems such as engine test shutdown

Inactive Publication Date: 2018-04-13
BEIJING INST OF AEROSPACE TESTING TECH
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Problems solved by technology

[0002] The ground test vehicle of a new generation of liquid oxygen kerosene rocket engine in my country is cooled by means of kerosene large-scale heat exchange, and all kerosene is cooled to a low temperature state. During the test, the engine test was shut down urgently due to low-temperature kerosene crystallization blocking the filter.

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  • Method for testing crystallization situations of free water in kerosene at different temperatures

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Embodiment Construction

[0012] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate and explain the present invention, but not to limit the scope of the present invention.

[0013] Such as figure 1 Shown, the present invention consists of premixer (1), thermometer (2), manual valve (3), kerosene container (4), heat exchange coil (5), pressure sensor (6), differential pressure gauge (7) , a visual filter (8), a flow meter (9), a data acquisition device (10), and a regulating valve (11).

[0014] Liquid nitrogen and nitrogen generate low-temperature nitrogen through the premixer to provide a cold source for the system. The temperature and flow of the cold source can be controlled through the flow of liquid nitrogen, nitrogen gas and the opening of the premixer outlet valve; the low-temperature nitrogen passes through the heat exchange coil to gr...

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Abstract

The invention discloses a method for testing crystallization situations of free water in kerosene at different temperatures. The method is characterized in that low-temperature nitrogen of a specifictemperature and a specific flow can be prepared by mixing normal-temperature nitrogen and liquid nitrogen, and low-temperature nitrogen temperature and flow control is achieved by adjusting the flowsof nitrogen and liquid nitrogen respectively; kerosene is slowly and uniformly cooled through the low-temperature nitrogen, and the consequence that testing results are affected as free water of partial kerosene is crystallized as the temperature is reduced too rapidly is avoided; the pressure difference change before and after a filter is acquired through a pressure difference sensor, then flow resistance change of the flowing process of the kerosene is acquired, and change of a solid crystal inside the kerosene is studied; in the kerosene flowing process, the crystallization accumulation process on a filtering net can be directly observed through a transparent visible filter. The method has the characteristics that equipment principles are simple, the temperature control precision is high, crystallization change of free water in kerosene can is direct and visible, and influence of temperature reduction of kerosene can be directly analyzed through both a macroscopic observation methodand data judgment.

Description

technical field [0001] The invention relates to a test method for studying kerosene crystallization at low temperature, and belongs to the technical field of aerospace tests. Background technique [0002] The ground test vehicle of a new generation of liquid oxygen kerosene rocket engine in my country is cooled by means of kerosene large-scale heat exchange, and all kerosene is cooled to a low temperature state. During the test, the engine test was shut down urgently due to low-temperature kerosene crystallization blocking the filter. . In order to improve the working reliability of this type of engine and propose a process improvement plan, it is necessary to conduct tests on the state of rocket low-temperature kerosene. Verify that kerosene is slowly cooled to the actual use state, whether there will be ice crystals; verify the effect of a small amount of low-temperature kerosene on the flow resistance of the engine filter; verify the effect of rapid cooling of kerosene on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/14
CPCG01N25/147
Inventor 李培昌王永超冯飞李志刚孙德王树光侯海宽
Owner BEIJING INST OF AEROSPACE TESTING TECH
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