Testing method for simulating high-temperature water-containing air current in combustion chamber
A test method and combustion chamber technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems that cannot meet the needs of engine combustion chambers, etc.
Active Publication Date: 2014-07-30
CHINA ACAD OF AEROSPACE AERODYNAMICS
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Problems solved by technology
Although the gas components provided by the gas wind tunnel contain water vapor, the upper limit of the total temperature that can be simulated is about 2000K, which cannot meet the high temperature (above 2000K) conditions inside the engine combustion chamber.
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[0023] Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0024] like figure 1 As shown, the test equipment for simulating the high-temperature water-containing airflow in the combustion chamber includes an arc heater 1, a mixing plenum 2 and a test nozzle 3, and the arc heater 1, the mixing plenum 2 and the test nozzle 3 are sealed and connected to each other. The arc heater 1 can be a tubular arc heater, a segmented arc heater, or a stacked arc heater. The mixing plenum 2 can choose mixing plenums with different axial lengths according to needs. The test nozzle 3 also can select the test nozzles of different shapes or lengths as required.
[0025] like figure 2 As shown, a water inlet 4 is arranged on the chamber wall upstream of the mixing plenum 2, and an even number (2n) of the water inlets 4 are evenly arranged on the chamber wall in a radially opposite manner. Liquid water is injected into the inside of the counter...
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The invention provides a testing method for simulating high-temperature water-containing air current in a combustion chamber, in particular to a method for simulating high-temperature water-containing air current of over 2000K in a combustion chamber by testing equipment. The method comprises the following steps: driving high-temperature air produced by heating of an electric-arc heater into a mixing pressure-stabilizing chamber; spraying normal-temperature liquid water of a certain mass flow into the mixing pressure-stabilizing chamber at relatively equivalent mass in the radial direction by virtue of a water inlet; and fully mixing the normal-temperature liquid water, which vaporizes by absorbing heat after meeting the high-temperature air, with the high-temperature air to form high-temperature air current containing water components, and driving the air current into a testing spray tube. By the method, high-temperature (over 2000K) air current containing water components can be produced. The method can be applied to pneumatic thermal ground tests specific to the research on the ablation resistance and ablation mechanism of a heat-resistant material of an engine combustion chamber.
Description
technical field [0001] The invention relates to an aerodynamic thermal ground test method for simulating high-temperature water-containing airflow in a combustion chamber. Background technique [0002] The thermal protection technology of engine combustion chamber is one of the key technologies of scramjet engine. C / C, C / SiC and ultra-high temperature ceramics (UHTC) and other carbon-based and ceramic-based composite materials and other ultra-high temperature heat-resistant materials, with their good high-temperature chemical and physical properties, are obtained in the thermal protection system of the engine combustion chamber. more widely used. Material surface oxidation ablation and mechanical erosion are the main manifestations of ablation or even destruction of heat-resistant materials in engine combustion chambers. [0003] After the combustion reaction of hydrocarbon fuel, the gas components inside the combustion chamber are mainly combustion product carbon dioxide ...
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IPC IPC(8): G01N25/00
Inventor 涂建强陈连忠彭锦龙杨忠凯
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS